CIDS - Fault in CIDS TOP BUS 1 R / Director 1

TASK 23-73-00-810-834-A
CIDS - Fault in CIDS TOP BUS 1 R / Director 1

1. Possible Causes

DIR-CIDS, 1 [101RH]
DIR-CIDS, 2 [102RH]
DEU-A [200RH26]
DEU-A [200RH22]
DEU-A [200RH18]
DEU-A [200RH12]
DEU-A [200RH8]
DEU-A [200RH4]
DEU mount 2014VU4
DEU mount 2010VU22
wiring
DEU mount 2010VU18
DEU mount 2010VU12
DEU mount 2010VU8
DEU mount 2010VU4
DEU-A [200RH16]
DEU-A [200RH14]
DEU-A [200RH2]
DEU TERMINATION BOX [209RH2]
DEU CONNECTION BOX [208RH14]
DEU CONNECTION BOX [208RH12]
DEU CONNECTION BOX [208RH8]
DEU CONNECTION BOX [208RH4]
DEU CONNECTION BOX [208RH2]
DEU-A [200RH10]
DEU-A [200RH6]
DEU CONNECTION BOX [208RH10]
DEU CONNECTION BOX [208RH6]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
ASM 237306
AMM 23-73-34-000-001	Removal of the CIDS Director
AMM 23-73-34-400-001	Installation of the CIDS Director
AMM 23-73-42-000-001	Removal of the Connection Box (208RH,308RH)
AMM 23-73-42-400-001	Installation of the Connection Box (208RH,308RH)
AMM 23-73-43-000-001	Removal of the Termination Box (209RH,309RH)
AMM 23-73-43-400-001	Installation of the Termination Box (209RH,309RH)
AMM 23-73-46-000-001	Removal of the Decoder/Encoder Unit A (200RH)
AMM 23-73-46-400-001	Installation of the Decoder/Encoder Unit A (200RH)
AMM 23-73-48-000-001	Removal of the DEU A/DEU B - Mount
AMM 23-73-48-400-001	Installation of the DEU A/DEU B - Mount

3. Fault Confirmation
Subtask 23-73-00-710-079-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS1/CIDS BUS test through the MCDU/CFDS.
(2) Do the CIDS1/DEU-A test through the MCDU/CFDS.

Subtask 23-73-00-710-079-B ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS Interface and Power-Up test through the CFDS.
AMM 23-73-00-740-005

4. Fault Isolation
Subtask 23-73-00-810-080-A

A. If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 23-73-00-810-136-F ** ON A/C NOT FOR ALL

B. If the CIDS1/CIDS BUS test gives the maintenance message TOP LINE 1R:

make sure that at least one cabin door is open,
On the overhead-panel 25VU:
make sure that the EMER EXIT LT switch (4WL) is in the OFF position,
remove the DIR-CIDS (101RH) AMM 23-73-34-000-001,
close these CBs:
49VU: 157RH (G02) CIDS/DIR 2/ESS,
121VU:156RH (M07) CIDS/DIR 2/NORM,
wait for approx. 120 s,
do the CIDS2/CIDS BUS test through the MCDU/CFDS.

(1) If the CIDS2/CIDS BUS test is OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.

(2) If the fault continues:

remove the DIR-CIDS, 2 [102RH] AMM 23-73-34-000-001.
during the installation of the DIR-CIDS, 1 (101RH) do not close these CBs:
49VU: 157RH (G02) CIDS/DIR 2/ESS,
121VU:156RH (M07) CIDS/DIR 2/NORM,
install the DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
do the CIDS1/CIDS BUS test through the MCDU/CFDS.

(3) If the CIDS1/CIDS BUS test is OK:

install a new DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.

(4) If the fault continues:

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001
open these CBs:
49VU: 154RH COM/CIDS/DEU A ESS/LINE 1
49VU: 155RH COM/CIDS/DEU A ESS/LINE 2
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD
121VU: 166RH COM NAV/CIDS/DEU A NORM/R MID
121VU: 168RH COM NAV/CIDS/DEU A NORM/R AFT
make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/A15 and connector AA/B15 is between approx. 80 and 200 ohms ASM 237306.

(5) If the resistance (line to line) is between approx. 80 and 200 ohms:

make sure that the resistance (line to GND) is not less than 50 ohms (short circuit) between:
DIR-CIDS (101RH) and (102RH) connector AA/A15 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B15 and GND. ASM 237306

(a) If there is no short circuit:

remove the DEU-A [200RH26] AMM 23-73-46-000-001
install the DIR-CIDS (101RH) and DIR-CIDS (102RH) AMM 23-73-34-400-001.
close these CBs:
49VU: 154RH COM/CIDS/DEU A ESS/LINE 1
49VU: 155RH COM/CIDS/DEU A ESS/LINE 2
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD
121VU: 166RH COM NAV/CIDS/DEU A NORM/R MID
121VU: 168RH COM NAV/CIDS/DEU A NORM/R AFT
do the CIDS BITE test through the MCDU/CFDS AMM 23-73-00-740-005.

1 If the CIDS BITE test gives the maintenance message DEU-A 200RH26:

install a new DEU-A [200RH26] AMM 23-73-46-400-001.

2 If the CIDS BITE test gives the maintenance message CIDS TOP LINE 1 R:

install the removed DEU-A [200RH26] AMM 23-73-46-400-001.
do the steps 4. B. (5) (a) again for the subsequent DEUs until the maintenance message stops: ASM 237306
DEU-A [200RH22]
DEU-A [200RH18]
DEU-A [200RH12]
DEU-A [200RH8]
DEU-A [200RH4]

(b) If there is a short circuit:

remove the DEU-A [200RH26] AMM 23-73-46-000-001
do a check for a short circuit again.

1 If there is no short circuit:

install a new DEU-A [200RH26] AMM 23-73-46-400-001.

2 If the fault continues:

disconnect the electrical connector 7253VC4 from the DEU mount 2014VU4 AMM 23-73-48-000-001.
do a check for a short circuit again.

a If there is no short circuit:

install a new DEU mount 2014VU4 AMM 23-73-48-000-001 and AMM 23-73-48-400-001.

b If the fault continues:

remove the DEU-A [200RH22] AMM 23-73-46-000-001
do a check for a short circuit again.
b.1. If there is no short circuit:
install a new DEU-A [200RH22] AMM 23-73-46-400-001.
b.2. If the fault continues:
install the removed DEU-A [200RH22] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU mount 2014VU4 AMM 23-73-48-400-001,
disconnect the electrical connector 7213VC22 from the DEU mount 2010VU22 AMM 23-73-48-000-001,
do a check for a short circuit again.
b.2.1. If there is no short circuit:
do a check for a short circuit at the connector 7213VC22 between pin 9 and GND (pin 11) and between pin 10 and GND (pin 11).
b.2.1.1. If there is a short circuit:
repair the wiring between the DEU mount 2010VU22 and the DEU mount 2014VU4 ASM 237306.
b.2.1.2. If there is no short circuit:
install a new DEU mount 2010VU22 AMM 23-73-48-400-001.
b.2.2. If there is a short circuit:
install the removed DEU-A [200RH22] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU mount 2010VU22 AMM 23-73-48-400-001,
do the steps (4. B. (5) (b) 2 b) again for the subsequent DEUs and DEU mounts until the maintenance message stops: ASM 237306
DEU-A [200RH18] and DEU mount 2010VU18 ,
DEU-A [200RH12] and DEU mount 2010VU12 ,
DEU-A [200RH8] and DEU mount 2010VU8 ,
DEU-A [200RH4] and DEU mount 2010VU4 .

(6) If the resistance (line to line) is more than 200 ohms (open circuit):

disconnect the electrical connector 7253VC4 from the DEU mount 2014VU4 AMM 23-73-48-000-001,
make sure that the resistance (line to line) is not more than 200 ohms (open circuit) between:
DEU mount 2014VU4 pin A/1 and pin A/2

(a) If there is an open circuit:

install a new DEU mount 2014VU4 AMM 23-73-48-400-001

(b) If there is no open circuit:

reconnect the electrical connector to the DEU mount 2014VU4 AMM 23-73-48-400-001
disconnect the electrical connector 7213VC4 from the DEU mount 2010VU4 AMM 23-73-48-000-001,
do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A15 and the connector 7213VC4 pin A/1,
DIR-CIDS (101RH) connector AA/B15 and the connector 7213VC4 pin A/2.

1 If there is no continuity:

repair the wiring between the DIR-CIDS (101RH) and the connector 7213VC4 ASM 237306.

2 If there is continuity:

do a check of the wiring (continuity-check) between:
DEU mount 2010VU4 pin A/1 and pin A/9 ,
DEU mount 2010VU4 pin A/2 and pin A/10.

a If there is no continuity:

install a new DEU mount 2010VU4 AMM 23-73-48-000-001 and AMM 23-73-48-400-001

b If there is continuity:

reconnect the connector 7213VC4 to the DEU mount 2010VU4 AMM 23-73-48-400-001
do the steps 4. B. (6) again for the subsequent DEU mounts until the maintenance message stops:
DIR-CIDS (101RH) and DEU mount 2010VU8 /connector 7213VC8,
DIR-CIDS (101RH) and DEU mount 2010VU12 /connector 7213VC12,
DIR-CIDS (101RH) and DEU mount 2010VU18 /connector 7213VC18,
DIR-CIDS (101RH) and DEU mount 2010VU22 /connector 7213VC22,
DIR-CIDS (101RH) and DEU mount 2014VU4 /connector 7253VC4.

(7) If the resistance (line to line) is less than 80 ohms (short circuit):

remove the DEU-A [200RH26] AMM 23-73-46-000-001.
do a check for a short circuit again.

(a) If there is no short circuit:

install a new DEU-A [200RH26] AMM 23-73-46-400-001.

(b) If there is a short circuit:

install the removed DEU-A [200RH26] AMM 23-73-46-400-001.
diconnect the electrical connector 7253VC4 from the DEU mount 2014VU4 ASM 237306,
do a check for a short circuit again.

1 If there is a short circuit:

reconnect the electrical connector to the DEU mount 2014VU4 AMM 23-73-48-400-001,
do the steps 4. B. (7) again for the subsequent DEUs and DEU mounts until the maintenance message stops: ASM 237306
DEU-A [200RH22] and DEU mount 2010VU22 ,
DEU-A [200RH18] and DEU mount 2010VU18 ,
DEU-A [200RH12] and DEU mount 2010VU12 ,
DEU-A [200RH8] and DEU mount 2010VU8 ,
DEU-A [200RH4] and DEU mount 2010VU4 .

2 If there is no short circuit:

do a check for a short circuit at the disconnected connector between the pins A/9 and A/10 ASM 237306

a If there is a short circuit:

repaire the wiring between the related DEU mount 2010VUxx and the DEU mount 2014VUxx/2010VUxx ASM 237306.

b If there is no short circuit:

install a new DEU mount 2014VU4 AMM 23-73-48-400-001.

Subtask 23-73-00-810-136-J ** ON A/C NOT FOR ALL

B. If the CIDS1/CIDS BUS test gives the maintenance message CIDS TOP BUS 1R/ DIR1 (101RH)

remove the DIR-CIDS (101RH) AMM 23-73-34-000-001,
make sure that at least one cabin door is open,
On the overhead-panel 25VU:
make sure that the EMER EXIT LT switch (4WL) is in the OFF position,
close these CBs:
49VU: 157RH COM/CIDS/DIR ESS/2,
120VU: 156RH COM NAV/CIDS/DIR NORM /2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS,
wait for approx. 120 s,
do the CIDS2/CIDS BUS test through the MCDU/CFDS.

(1) If the CIDS2/CIDS BUS test is OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.

(2) If the fault continues:

remove the DIR-CIDS, 2 [102RH] AMM 23-73-34-000-001.
during the installation of the DIR-CIDS, 1 (101RH) do not close these CBs:
49VU: 157RH COM/CIDS/DIR ESS/2,
120VU: 156RH COM NAV/CIDS/DIR NORM /2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS,
install the DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
do the CIDS1/CIDS BUS test through the MCDU/CFDS.

(3) If the CIDS1/CIDS BUS test is OK:

install a new DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.

(4) If the fault continues:

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001
open these CBs:
49VU: 158RH COM/CIDS/DEU A ESS/FWD R
49VU: 172RH COM/CIDS/DEU A ESS/AFT R
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD
121VU: 168RH COM NAV/CIDS/DEU A NORM/R AFT
make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/A15 and connector AA/B15 is between approx. 80 and 120 ohms ASM 237306.

(5) If the resistance (line to line) is between approx. 80 and 120 ohms:

make sure that the resistance (line to GND) is not less than 200 ohms (short circuit) between:
DIR-CIDS (101RH) and (102RH) connector AA/A15 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B15 and GND. ASM 237306

(a) If there is no short circuit:

remove the DEU-A [200RH16] AMM 23-73-46-000-001
install the DIR-CIDS (101RH) and DIR-CIDS (102RH) AMM 23-73-34-400-001.
close these CBs:
49VU: 158RH COM/CIDS/DEU A ESS/FWD R
49VU: 172RH COM/CIDS/DEU A ESS/AFT R
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD
121VU: 168RH COM NAV/CIDS/DEU A NORM/R AFT
do the CIDS Interface and POWER-Up test through the MCDU/CFDS AMM 23-73-00-740-005.

1 If the CIDS POWER-UP test gives the maintenance message DEU-A 200RH16:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

2 If the CIDS POWER-UP test gives the maintenance message CIDS TOP BUS 1R/ DIR1 (101RH):

install the removed DEU-A [200RH16] AMM 23-73-46-400-001.
do the steps 4. B. (5) (a) again for the subsequent DEUs until the maintenance message stops: ASM 237306
DEU-A [200RH14]
DEU-A [200RH12]
DEU-A [200RH8]
DEU-A [200RH4]
DEU-A [200RH2]

(b) If there is a short circuit:

remove the DEU-A [200RH16] AMM 23-73-46-000-001
do a check for a short circuit again.

1 If there is no short circuit:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

2 If the fault continues:

disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ASM 237306
do a check for a short circuit again.

a If there is no short circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

b If the fault continues:

remove the DEU-A [200RH14] AMM 23-73-46-000-001
do a check for a short circuit again.
b.1. If there is no short circuit:
install a new DEU-A [200RH14] AMM 23-73-46-400-001.
b.2. If the fault continues:
install the removed DEU-A [200RH14] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
disconnect the electrical connector from the DEU CONNECTION BOX [208RH14] ASM 237306.
do a check for a short circuit again.
b.2.1. If there is no short circuit:
do a check for a short circuit at the connector between pin 9 and GND (pin 11) and between pin 10 and GND (pin 11).
b.2.1.1. If there is a short circuit:
repair the wiring between the DEU CONNECTION BOX (208RH14) and the DEU TERMINATIONBOX (209RH2) ASM 237306.
b.2.1.2. If there is no short circuit:
install a new DEU CONNECTION BOX [208RH14] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.
b.2.2. If there is a short circuit:
install the removed DEU-A [200RH14] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU CONNECTION BOX [208RH14]
do the steps (4. B. (5) (b) 2 b) again for the subsequent DEUs and DEU CONNECTION BOXES until the maintenance message stops: ASM 237306
DEU-A [200RH12] and DEU CONNECTION BOX [208RH12] ,
DEU-A [200RH8] and DEU CONNECTION BOX [208RH8] ,
DEU-A [200RH4] and DEU CONNECTION BOX [208RH4] ,
DEU-A [200RH2] and DEU CONNECTION BOX [208RH2] ,

(6) If the resistance (line to line) is more than 120 ohms (open circuit):

disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ,
make sure that the resistance (line to line) is not more than 120 ohms (open circuit) between:
DEU TERMINATION BOX (209RH2) pin A/1 and pin A/2

(a) If there is an open circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

(b) If there is no open circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
disconnect the electrical connector from the DEU CONNECTION BOX [208RH2] ,
do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A15 and the connector from the DEU CONNECTION BOX [208RH2] pin A/2,
DIR-CIDS (101RH) connector AA/B15 and the connector from the DEU CONNECTION BOX [208RH2] pin A/2.

1 If there is no continuity:

repair the wiring between the DIR-CIDS (101RH) and the connector of the DEU CONNECTION BOX [208RH2] ASM 237306.

2 If there is continuity:

do a check of the wiring (continuity-check) between:
DEU CONNECTION BOX [208RH2] pin A/1 and pin A/9 ,
DEU CONNECTION BOX [208RH2] pin A/2 and pin A/10.

a If there is no continuity:

install a new DEU CONNECTION BOX [208RH2] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.

b If there is continuity:

reconnect the connector DEU CONNECTION BOX [208RH2] .
do the steps 4. B. (6) again for the subsequent DEU CONNECTION BOXES until the maintenance message stops:
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH4] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH8] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH12] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH14] ,
DIR-CIDS (101RH) and DEU TERMINATION BOX [209RH2] ,

(7) If the resistance (line to line) is less than 80 ohms (short circuit):

remove the DEU-A [200RH16] AMM 23-73-46-000-001.
do a check for a short circuit again.

(a) If there is no short circuit:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

(b) If there is a short circuit:

install the removed DEU-A [200RH16] AMM 23-73-46-400-001.
disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ASM 237306,
do a check for a short circuit again.

1 If there is a short circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
do the steps 4. B. (7) again for the subsequent DEUs and DEU CONNECTION BOXES until the maintenance message stops: ASM 237306
DEU-A [200RH14] and DEU CONNECTION BOX [208RH14] ,
DEU-A [200RH12] and DEU CONNECTION BOX [208RH12] ,
DEU-A [200RH8] and DEU CONNECTION BOX [208RH8] ,
DEU-A [200RH4] and DEU CONNECTION BOX [208RH4] ,
DEU-A [200RH2] and DEU CONNECTION BOX [208RH2] ,

2 If there is no short circuit:

do a check for a short circuit at the disconnected connector between the pins A/9 and A/10 ASM 237306

a If there is a short circuit:

repair the wiring between the related DEU CONNECTION BOX 208RHxx and the DEU CONNECTION/ TERMINATION BOX 208/209RHxx ASM 237306.

b If there is no short circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

Subtask 23-73-00-810-136-K ** ON A/C NOT FOR ALL

B. If the CIDS1/CIDS BUS test gives the maintenance message CIDS TOP BUS 1R/ DIR1 (101RH)

remove the DIR-CIDS (101RH) AMM 23-73-34-000-001,
make sure that at least one cabin door is open,
close these CBs:
49VU: 157RH COM/CIDS/DIR ESS/2,
120VU: 156RH COM NAV/CIDS/DIR NORM /2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS,
wait for approx. 120 s,
do the CIDS2/CIDS BUS test through the MCDU/CFDS.

(1) If the CIDS2/CIDS BUS test is OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.

(2) If the fault continues:

remove the DIR-CIDS, 2 [102RH] AMM 23-73-34-000-001.
during the installation of the DIR-CIDS, 1 (101RH) do not close these CBs:
49VU: 157RH COM/CIDS/DIR ESS/2,
120VU: 156RH COM NAV/CIDS/DIR NORM /2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS,
install the DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
do the CIDS1/CIDS BUS test through the MCDU/CFDS.

(3) If the CIDS1/CIDS BUS test is OK:

install a new DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.

(4) If the fault continues:

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001
open these CBs:
49VU: 158RH COM/CIDS/DEU A ESS/FWD R
49VU: 172RH COM/CIDS/DEU A ESS/AFT R
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD
121VU: 168RH COM NAV/CIDS/DEU A NORM/R AFT
make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/A15 and connector AA/B15 is between approx. 80 and 120 ohms ASM 237306.

(5) If the resistance (line to line) is between approx. 80 and 120 ohms:

make sure that the resistance (line to GND) is not less than 200 ohms (short circuit) between:
DIR-CIDS (101RH) and (102RH) connector AA/A15 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B15 and GND. ASM 237306

(a) If there is no short circuit:

remove the DEU-A [200RH16] AMM 23-73-46-000-001
install the DIR-CIDS (101RH) and DIR-CIDS (102RH) AMM 23-73-34-400-001.
close these CBs:
49VU: 158RH COM/CIDS/DEU A ESS/FWD R
49VU: 172RH COM/CIDS/DEU A ESS/AFT R
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD
121VU: 168RH COM NAV/CIDS/DEU A NORM/R AFT
do the CIDS Interface and POWER-Up test through the MCDU/CFDS AMM 23-73-00-740-005.

1 If the CIDS POWER-UP test gives the maintenance message DEU-A 200RH16:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

2 If the CIDS POWER-UP test gives the maintenance message CIDS TOP BUS 1R/ DIR1 (101RH):

install the removed DEU-A [200RH16] AMM 23-73-46-400-001.
do the steps 4. B. (5) (a) again for the subsequent DEUs until the maintenance message stops: ASM 237306
DEU-A [200RH14]
DEU-A [200RH12]
DEU-A [200RH8]
DEU-A [200RH4]
DEU-A [200RH2]

(b) If there is a short circuit:

remove the DEU-A [200RH16] AMM 23-73-46-000-001
do a check for a short circuit again.

1 If there is no short circuit:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

2 If the fault continues:

disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ASM 237306
do a check for a short circuit again.

a If there is no short circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

b If the fault continues:

remove the DEU-A [200RH14] AMM 23-73-46-000-001
do a check for a short circuit again.
b.1. If there is no short circuit:
install a new DEU-A [200RH14] AMM 23-73-46-400-001.
b.2. If the fault continues:
install the removed DEU-A [200RH14] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
disconnect the electrical connector from the DEU CONNECTION BOX [208RH14] ASM 237306.
do a check for a short circuit again.
b.2.1. If there is no short circuit:
do a check for a short circuit at the connector between pin 9 and GND (pin 11) and between pin 10 and GND (pin 11).
b.2.1.1. If there is a short circuit:
repair the wiring between the DEU CONNECTION BOX (208RH14) and the DEU TERMINATIONBOX (209RH2) ASM 237306.
b.2.1.2. If there is no short circuit:
install a new DEU CONNECTION BOX [208RH14] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.
b.2.2. If there is a short circuit:
install the removed DEU-A [200RH14] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU CONNECTION BOX [208RH14]
do the steps (4. B. (5) (b) 2 b) again for the subsequent DEUs and DEU CONNECTION BOXES until the maintenance message stops: ASM 237306
DEU-A [200RH12] and DEU CONNECTION BOX [208RH12] ,
DEU-A [200RH8] and DEU CONNECTION BOX [208RH8] ,
DEU-A [200RH4] and DEU CONNECTION BOX [208RH4] ,
DEU-A [200RH2] and DEU CONNECTION BOX [208RH2] ,

(6) If the resistance (line to line) is more than 120 ohms (open circuit):

disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ,
make sure that the resistance (line to line) is not more than 120 ohms (open circuit) between:
DEU TERMINATION BOX (209RH2) pin A/1 and pin A/2

(a) If there is an open circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

(b) If there is no open circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
disconnect the electrical connector from the DEU CONNECTION BOX [208RH2] ,
do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A15 and the connector from the DEU CONNECTION BOX [208RH2] pin A/2,
DIR-CIDS (101RH) connector AA/B15 and the connector from the DEU CONNECTION BOX [208RH2] pin A/2.

1 If there is no continuity:

repair the wiring between the DIR-CIDS (101RH) and the connector of the DEU CONNECTION BOX [208RH2] ASM 237306.

2 If there is continuity:

do a check of the wiring (continuity-check) between:
DEU CONNECTION BOX [208RH2] pin A/1 and pin A/9 ,
DEU CONNECTION BOX [208RH2] pin A/2 and pin A/10.

a If there is no continuity:

install a new DEU CONNECTION BOX [208RH2] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.

b If there is continuity:

reconnect the connector DEU CONNECTION BOX [208RH2] .
do the steps 4. B. (6) again for the subsequent DEU CONNECTION BOXES until the maintenance message stops:
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH4] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH8] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH12] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH14] ,
DIR-CIDS (101RH) and DEU TERMINATION BOX [209RH2] ,

(7) If the resistance (line to line) is less than 80 ohms (short circuit):

remove the DEU-A [200RH16] AMM 23-73-46-000-001.
do a check for a short circuit again.

(a) If there is no short circuit:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

(b) If there is a short circuit:

install the removed DEU-A [200RH16] AMM 23-73-46-400-001.
disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ASM 237306,
do a check for a short circuit again.

1 If there is a short circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
do the steps 4. B. (7) again for the subsequent DEUs and DEU CONNECTION BOXES until the maintenance message stops: ASM 237306
DEU-A [200RH14] and DEU CONNECTION BOX [208RH14] ,
DEU-A [200RH12] and DEU CONNECTION BOX [208RH12] ,
DEU-A [200RH8] and DEU CONNECTION BOX [208RH8] ,
DEU-A [200RH4] and DEU CONNECTION BOX [208RH4] ,
DEU-A [200RH2] and DEU CONNECTION BOX [208RH2] ,

2 If there is no short circuit:

do a check for a short circuit at the disconnected connector between the pins A/9 and A/10 ASM 237306

a If there is a short circuit:

repair the wiring between the related DEU CONNECTION BOX 208RHxx and the DEU CONNECTION/ TERMINATION BOX 208/209RHxx ASM 237306.

b If there is no short circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

Subtask 23-73-00-810-136-O ** ON A/C NOT FOR ALL

B. If the CIDS Interface and Power-Up test gives the maintenance message CIDS TOP BUS 1R/DIR1 (101RH):

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001,
make sure that at least one cabin door is open.
on the overhead panel 25VU:
make sure that the EMER EXIT LT switch (4WL) is in the OFF position.
close these CBs:
49VU: 157RH COM/CIDS/DIR ESS/2,
120VU: 156RH COM NAV/CIDS/DIR NORM /2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS.
wait for approx. 120s,
do the CIDS2 Interface and Power-Up test through the CFDS.

(1) If the CIDS2 Interface and Power-Up test is OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.

(2) If the fault continues:

remove the DIR-CIDS, 2 [102RH] AMM 23-73-34-000-001.
during the installation of the DIR-CIDS, 1 [101RH] do not close these CBs:
49VU: 157RH COM/CIDS/DIR ESS/2,
120VU: 156RH COM NAV/CIDS/DIR NORM /2,
122VU: 14WH AIR COND/CIDS/SDF/DIR NORM/2,
49VU: 18WH AIR COND/CIDS/SDF/DIR 2 ESS.
install the DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
do the CIDS Interface and Power-Up test through the CFDS.

(3) If the CIDS Interface and Power-Up test is OK:

install a new DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.

(4) If the fault continues:

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001.
open these CBs:
49VU: 158RH COM/CIDS/DEU A ESS/FWD R,
49VU: 196RH COM/CIDS/DEU A ESS/MID R,
49VU: 172RH COM/CIDS/DEU A ESS/AFT R,
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD,
2001VU: 198RH COM NAV/CIDS/DEU A NORM/R MID,
2001VU: 174RH COM NAV/CIDS/DEU A NORM/R AFT.
make sure that the resistance (line to line) at DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] connector AA/A15 and connector AA/B15 is between approx. 80 and 120 ohm ASM 237306.

(5) If the resistance (line to line) is between approx. 80 and 120 ohm:

make sure that the resistance (line to GND) is not less than 200 ohm (short circuit) between:
DIR-CIDS (101RH) and (102RH) connector AA/A15 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B15 and GND. ASM 237306

(a) If there is no short circuit:

remove the DEU-A [200RH16] AMM 23-73-46-000-001,
install the DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
close these CBs:
49VU: 158RH COM/CIDS/DEU A ESS/FWD R,
49VU: 196RH COM/CIDS/DEU A ESS/MID R,
49VU: 172RH COM/CIDS/DEU A ESS/AFT R,
121VU: 164RH COM NAV/CIDS/DEU A NORM/R FWD,
2001VU: 198RH COM NAV/CIDS/DEU A NORM/R MID,
2001VU: 174RH COM NAV/CIDS/DEU A NORM/R AFT.
do the CIDS Interface and Power-Up test through the CFDS.

1 If the CIDS Interface and Power-Up test gives the maintenance message DEU-A [200RH16] :

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

2 If the CIDS Interface and Power-Up test gives the maintenance message CIDS TOP BUS 1R/DIR1 (101RH):

install the removed DEU-A [200RH16] AMM 23-73-46-400-001.
do the steps 4. B. (5) (a) again for the subsequent DEUs until the maintenance message stops: ASM 237306
DEU-A [200RH14]
DEU-A [200RH12]
DEU-A [200RH10]
DEU-A [200RH8]
DEU-A [200RH6]
DEU-A [200RH4]
DEU-A [200RH2]

(b) If there is a short circuit:

remove the DEU-A [200RH16] AMM 23-73-46-000-001,
do a check for a short circuit again.

1 If there is no short circuit:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

2 If the fault continues:

disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ASM 237306,
do a check for a short circuit again.

a If there is no short circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

b If the fault continues:

remove the DEU-A [200RH14] AMM 23-73-46-000-001,
do a check for a short circuit again.
b.1. If there is no short circuit:
install a new DEU-A [200RH14] AMM 23-73-46-400-001.
b.2. If the fault continues:
install the removed DEU-A [200RH14] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
disconnect the electrical connector from the DEU CONNECTION BOX [208RH14] ASM 237306,
do a check for a short circuit again.
b.2.1. If there is no short circuit:
do a check for a short circuit at the connector between pin 9 and GND (pin 11) and between pin 10 and GND (pin 11).
b.2.1.1. If there is a short circuit:
repair the wiring between the DEU CONNECTION BOX (208RH14) and the DEU TERMINATION BOX (209RH2) ASM 237306.
b.2.1.2. If there is no short circuit:
install a new DEU CONNECTION BOX [208RH14] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.
b.2.2. If there is a short circuit:
install the removed DEU-A [200RH14] AMM 23-73-46-400-001,
reconnect the electrical connector to the DEU CONNECTION BOX [208RH14] ,
do the steps (4. B. (5) (b) 2 b) again for the subsequent DEUs and DEU CONNECTION BOXES until the maintenance message stops: ASM 237306
DEU-A [200RH12] and DEU CONNECTION BOX [208RH12] ,
DEU-A [200RH10] and DEU CONNECTION BOX [208RH10] ,
DEU-A [200RH8] and DEU CONNECTION BOX [208RH8] ,
DEU-A [200RH6] and DEU CONNECTION BOX [208RH6] ,
DEU-A [200RH4] and DEU CONNECTION BOX [208RH4] ,
DEU-A [200RH2] and DEU CONNECTION BOX [208RH2] .

(6) If the resistance (line to line) is more than 120 ohm (open circuit):

disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ,
make sure that the resistance (line to line) is not more than 120 ohm (open circuit) between:
DEU TERMINATION BOX (209RH2) pin A/1 and pin A/2

(a) If there is an open circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

(b) If there is no open circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
disconnect the electrical connector from the DEU CONNECTION BOX [208RH2] ,
do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A15 and the connector from the DEU CONNECTION BOX [208RH2] pin A/2,
DIR-CIDS (101RH) connector AA/B15 and the connector from the DEU CONNECTION BOX [208RH2] pin A/2.

1 If there is no continuity:

repair the wiring between the DIR-CIDS (101RH) and the connector of the DEU CONNECTION BOX [208RH2] ASM 237306.

2 If there is continuity:

do a check of the wiring (continuity-check) between:
DEU CONNECTION BOX [208RH2] pin A/1 and pin A/9 ,
DEU CONNECTION BOX [208RH2] pin A/2 and pin A/10.

a If there is no continuity:

install a new DEU CONNECTION BOX [208RH2] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.

b If there is continuity:

reconnect the connector DEU CONNECTION BOX [208RH2] .
do the steps 4. B. (6) again for the subsequent DEU CONNECTION BOXES until the maintenance message stops:
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH4] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH6] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH8] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH10] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH12] ,
DIR-CIDS (101RH) and DEU CONNECTION BOX [208RH14] ,
DIR-CIDS (101RH) and DEU TERMINATION BOX [209RH2] .

(7) If the resistance (line to line) is less than 80 ohm (short circuit):

remove the DEU-A [200RH16] AMM 23-73-46-000-001,
do a check for a short circuit again.

(a) If there is no short circuit:

install a new DEU-A [200RH16] AMM 23-73-46-400-001.

(b) If there is a short circuit:

install the removed DEU-A [200RH16] AMM 23-73-46-400-001,
disconnect the electrical connector from the DEU TERMINATION BOX [209RH2] ASM 237306,
do a check for a short circuit again.

1 If there is a short circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [209RH2] ,
do the steps 4. B. (7) again for the subsequent DEUs and DEU CONNECTION BOXES until the maintenance message stops: ASM 237306
DEU-A [200RH14] and DEU CONNECTION BOX [208RH14] ,
DEU-A [200RH12] and DEU CONNECTION BOX [208RH12] ,
DEU-A [200RH10] and DEU CONNECTION BOX [208RH10] ,
DEU-A [200RH8] and DEU CONNECTION BOX [208RH8] ,
DEU-A [200RH6] and DEU CONNECTION BOX [208RH6] ,
DEU-A [200RH4] and DEU CONNECTION BOX [208RH4] ,
DEU-A [200RH2] and DEU CONNECTION BOX [208RH2] .

2 If there is no short circuit:

do a check for a short circuit at the disconnected connector between the pins A/9 and A/10 ASM 237306.

a If there is a short circuit:

repair the wiring between the related DEU CONNECTION BOX 208RHxx and the DEU CONNECTION/ TERMINATION BOX 208/209RHxx ASM 237306.

b If there is no short circuit:

install a new DEU TERMINATION BOX [209RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.

Subtask 23-73-00-810-464-A ** ON A/C NOT FOR ALL

C. Installation of removed components

Install the removed DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
Install all the removed DEU-A (200RHxx) AMM 23-73-46-400-001.
Reconnect all the DEU-mount-connectors to the related DEU-mounts (2010VUxx/2014VUx) AMM 23-73-48-400-001.

Subtask 23-73-00-810-464-B ** ON A/C NOT FOR ALL

C. Installation of removed components

Install the removed DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
Install all the removed DEU-A (200RHxx) AMM 23-73-46-400-001.
Reconnect all the DEU CONNECTION/ TERMINATION BOX-connectors to the related DEU CONNECTION/ TERMINATION BOX (208RHxx/209RHxx) ASM 237306
Make sure that all previously opened CBs are closed.

Subtask 23-73-00-810-465-A

D. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:25:50 UTC