CIDS - Fault in the CIDS MID BUS R / Director 1

TASK 23-73-00-810-837-A
CIDS - Fault in the CIDS MID BUS R / Director 1

1. Possible Causes

DIR-CIDS, 1 [101RH]
DIR-CIDS, 2 [102RH]
DEU-B [300RH6]
DEU-B [300RH4]
DEU mount 2015VU2
DEU mount 2011VU4
wiring
DEU mount 2011VU2
DEU-B [300RH8]
DEU TERMINATION BOX [309RH2]
DEU CONNECTION BOX [308RH6]
DEU CONNECTION BOX [308RH2]
DEU CONNECTION BOX [308RH4]

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 23-73-47-000-001	Removal of the Decoder/Encoder Unit B (300RH)
AMM 23-73-47-400-001	Installation of the Decoder/Encoder Unit B (300RH)
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 23-73-00-710-078-A ** ON A/C NOT FOR ALL

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

Subtask 23-73-00-710-078-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 23-73-00-810-079-A

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

Subtask 23-73-00-810-142-F ** ON A/C NOT FOR ALL

B. If the CIDS1/CIDS BUS test gives the maintenance message CIDS MID BUS R:

Make sure that at least one cabin door is open.
In the cockpit, 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 CFDS/MCDU.

(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 CFDS/MCDU.

(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: 153RH COM/CIDS/DEU B/ESS,
120RH: 162RH COM NAV/CIDS/DEU B/NORM.
Make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/A14 and connector AA/B14 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/A14 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B14 and GND ASM 237306.

(a) If there is no short circuit:

Remove the DEU-B [300RH6] AMM 23-73-47-000-001.
Install the DIR-CIDS (101RH) and DIR-CIDS (102RH) AMM 23-73-34-400-001.
Close these CBs:
49VU: 153RH COM/CIDS/DEU B/ESS,
120RH: 162RH COM NAV/CIDS/DEU B/NORM.
Do the CIDS BITE test through the CFDS/MCDU AMM 23-73-00-740-005.

1 If the CIDS BITE test gives the maintenance message DEU-B 300RH6:

Install a new DEU-B [300RH6] AMM 23-73-47-400-001.

2 If the CIDS BITE test gives the maintenance message CIDS MID BUS R:

Install the removed DEU-B [300RH6] AMM 23-73-47-400-001.
Do the steps 4. B. (5) (a) again for the subsequent DEU(s) until the maintenance message stops: ASM 237306.
DEU-B [300RH4]

(b) If there is a short circuit:

Remove the DEU-B [300RH6] AMM 23-73-47-000-001.
Do a check for a short circuit again.

1 If there is no short circuit:

Install a new DEU-B [300RH6] AMM 23-73-47-400-001.

2 If the fault continues:

Disconnect the electrical connector 7247VC2 from the DEU mount 2015VU2 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 2015VU2 AMM 23-73-48-000-001 and AMM 23-73-48-400-001.

b If the fault continues:

Install the removed DEU-B [300RH6] AMM 23-73-47-400-001.
Reconnect the electrical connector to the DEU mount 2015VU2 AMM 23-73-48-400-001.
Remove the DEU-B [300RH4] AMM 23-73-47-000-001.
Do a check for a short circuit again.
b.1. If there is no short circuit:
Install a new DEU-B [300RH4] AMM 23-73-47-400-001.
b.2. If the fault continues:
Disconnect the electrical connector 7201VC4 from the DEU mount 2011VU4 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 disconnected connector 7201VC4 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 2011VU4 and the DEU mount 2015VU2 ASM 237306.
b.2.1.2. If there is no short circuit:
Install a new DEU mount 2011VU4 AMM 23-73-48-400-001.
b.2.2. If there is a short circuit:
Install the removed DEU-B [300RH4] AMM 23-73-47-400-001.
Reconnect the electrical connector to the DEU mount 2011VU4 AMM 23-73-48-400-001.
Do the steps (4. B. (5) (b) 2 b) again for the subsequent DEU(s) and DEU mount(s) until the maintenance message stops: ASM 237306.
DEU mount 2011VU2 .

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

disconnect the electrical connector 7247VC2 from the DEU mount 2015VU2 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 2015VU2 pin A/1 and pin A/2.

(a) If there is an open circuit:

Install a new DEU mount 2015VU2 AMM 23-73-48-400-001.

(b) If there is no open circuit:

Reconnect the electrical connector to the DEU mount 2015VU2 AMM 23-73-48-400-001.
Disconnect the electrical connector 7201VC2 from the DEU mount 2011VU2 AMM 23-73-48-000-001.
Do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A14 and the connector 7201VC2 pin A/1,
DIR-CIDS (101RH) connector AA/B14 and the connector 7201VC2 pin A/2.

1 If there is no continuity:

Repair the wiring between the DIR-CIDS (101RH) and the connector 7201VC2 ASM 237306.

2 If there is continuity:

Do a check of the wiring (continuity-check) between:
DEU mount 2011VU2 pin A/1 and pin A/9 ,
DEU mount 2011VU2 pin A/2 and pin A/10.

a If there is no continuity:

Install a new DEU mount 2011VU2 AMM 23-73-48-000-001 and AMM 23-73-48-400-001.

b If there is continuity:

Reconnect the connector 7201VC2 to the DEU mount 2011VU2 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 2011VU4 /connector 7201VC4,
DIR-CIDS (101RH) and DEU mount 2015VU2 /connector 7247VC2.

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

Remove the DEU-B [300RH6] AMM 23-73-47-000-001.
Do a check for a short circuit again.

(a) If there is no short circuit:

Install a new DEU-B [300RH6] AMM 23-73-47-400-001.

(b) If there is a short circuit:

Install the removed DEU-B [300RH6] AMM 23-73-47-400-001.
Diconnect the electrical connector 7247VC2 from the DEU mount 2015VU2 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 2015VU2 AMM 23-73-48-400-001.
Do the steps 4. B. (7) again for the subsequent DEU(s) and DEU mount(s) until the maintenance message stops: ASM 237306.
DEU-B [300RH4] and DEU mount 2011VU4 ,
DEU mount 2011VU2 .

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 mount 2011VUxx and the DEU mount 2015VUxx/2011VUxx ASM 237306.

b If there is no short circuit:

Install a new DEU mount 2015VU2 AMM 23-73-48-400-001.

Subtask 23-73-00-810-142-L ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message CIDS MID BUS R/ DIR1 (101RH):

make sure that at least one cabin door is open,
remove the DIR-CIDS (101RH) AMM 23-73-34-000-001,
close these CBs:
49VU: 157RH COM/CIDS/ DIR ESS/ 2,
49VU: 18WH AIR COND/ CIDS/SDF/ DIR 2 ESS,
120VU: 156RH COM NAV/ CIDS/ DIR NORM/ 2,
122VU: 14WH AIR COND/ CIDS/ SDF/ DIR NORM/ 2,
wait for approx. 120 s,
do the CIDS2 Interface and Power-Up Test via the CFDS/MCDU AMM 23-73-00-740-005.

(1) If the test is OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(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,
49VU: 18WH AIR COND/ CIDS/SDF/ DIR 2 ESS,
120VU: 156RH COM NAV/ CIDS/ DIR NORM/ 2,
122VU: 14WH AIR COND/ CIDS/ SDF/ DIR NORM/ 2,
install the DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(3) If the test is OK:

install a new DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(4) If the fault continues:

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001.
open these CBs:
49VU: 153RH COM/CIDS/DEU B/ESS
120VU: 162RH COM NAV/CIDS/DEU B/NORM
make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/A14 and connector AA/B14 is between approx. 80 and 140 ohms ASM 237306.

(5) If the resistance (line to line) is between approx. 80 and 140 ohms:

make sure that the resistance (line to GND) is not less than 7 k ohms (short circuit) between:
DIR-CIDS (101RH) and (102RH) connector AA/A14 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B14 and GND. ASM 237306

(a) If there is no short circuit:

remove the DEU-B [300RH6] AMM 23-73-47-000-001.
install the DIR-CIDS (101RH) and DIR-CIDS (102RH) AMM 23-73-34-400-001.
close these CBs:
49VU: 153RH COM/CIDS/DEU B/ESS
120VU: 162RH COM NAV/CIDS/DEU B/NORM
Do the test given in Para. 3.

1 If the test gives the maintenance message DEU-B 300RH8:

install a new DEU-B [300RH8] AMM 23-73-47-400-001.
Do the test given in Para. 3.

2 If the test gives the maintenance message CIDS MID BUS R/ DIR1 (101RH):

install the removed DEU-B [300RH8] AMM 23-73-47-400-001.
do the steps 4. B. (5) (a) again for the subsequent DEU(s) until the maintenance message stops: ASM 237306
DEU-B [300RH6]

(b) If there is a short circuit:

remove the DEU-B [300RH8] AMM 23-73-47-000-001,
do a check for a short circuit again.

1 If there is no short circuit:

install a new DEU-B [300RH8] AMM 23-73-47-400-001.
Do the test given in Para. 3.

2 If the fault continues:

disconnect the electrical connector from the DEU TERMINATION BOX [309RH2] .
do a check for a short circuit again.

a If there is no short circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.
Do the test given in Para. 3.

b If the fault continues:

install the removed DEU-B [300RH8] AMM 23-73-47-400-001,
reconnect the electrical connector to the DEU TERMINATION BOX [309RH2] ASM 237306,
remove the DEU-B [300RH6] AMM 23-73-47-000-001,
do a check for a short circuit again.
b.1. If there is no short circuit:
install a new DEU-B [300RH6] AMM 23-73-47-400-001,
Do the test given in Para. 3.
b.2. If the fault continues:
disconnect the electrical connector from the DEU CONNECTION BOX [308RH6] ,
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 disconnected connector between pin 9 and GND (pin 4) and between pin 10 and GND (pin 4).
b.2.1.1. If there is a short circuit:
repair the wiring between the DEU CONNECTION BOX [308RH6] and the DEU TERMINATION BOX [309RH2] ASM 237306.
Do the test given in Para. 3.
b.2.1.2. If there is no short circuit:
install a new DEU CONNECTION BOX [308RH2] AMM 23-73-42-400-001
Do the test given in Para. 3.
b.2.2. If there is a short circuit:
install the removed DEU-B [300RH6] AMM 23-73-47-400-001,
reconnect the electrical connector to the DEU CONNECTION BOX [308RH6] ,
do the steps (4. B. (5) (b) 2 b) again for the subsequent DEU(s) and DEU CONNECTION BOX(es) until the maintenance message stops: ASM 237306
DEU CONNECTION BOX [308RH2] .

(6) If the resistance (line to line) is more than 140 ohms (open circuit):

disconnect the electrical connector from the DEU TERMINATION BOX [309RH2] ,
make sure that the resistance (line to line) is not more than 140 ohms (open circuit) between:
DEU TERMINATION BOX [309RH2] pin A/1 and pin A/2

(a) If there is an open circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.
Do the test given in Para. 3.

(b) If there is no open circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [309RH2]
disconnect the electrical connector from the DEU CONNECTION BOX [308RH2] .
do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A14 and the DEU TERMINATION BOX connector pin A/2,
DIR-CIDS (101RH) connector AA/B14 and the DEU TERMINATION BOX connector pin A/1.

1 If there is no continuity:

repair the wiring between the DIR-CIDS (101RH) and the connector ASM 237306.
Do the test given in Para. 3.

2 If there is continuity:

do a check of the wiring (continuity-check) between:
DEU CONNECTION BOX [308RH2] pin A/1 and pin A/9 ,
DEU CONNECTION BOX [308RH2] pin A/2 and pin A/10.

a If there is no continuity:

install a new DEU CONNECTION BOX [308RH2] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.
Do the test given in Para. 3.

b If there is continuity:

reconnect the connector to the DEU CONNECTION BOX [308RH2]
do the steps 4. B. (6) again for the subsequent DEU CONNECTION/ TERMINATION BOX(es) until the maintenance message stops:
DIR-CIDS (101RH) and DEU CONNECTION BOX [308RH6] /connector,
DIR-CIDS (101RH) and DEU TERMINATION BOX [309RH2] /connector.

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

remove the DEU-B [300RH8] AMM 23-73-47-000-001,
do a check for a short circuit again.

(a) If there is no short circuit:

install a new DEU-B [300RH8] AMM 23-73-47-400-001,
Do the test given in Para. 3.

(b) If there is a short circuit:

install the removed DEU-B [300RH8] AMM 23-73-47-400-001,
diconnect the electrical connector from the DEU TERMINATION BOX [309RH2] 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 [309RH2]
do the steps 4. B. (7) again for the subsequent DEU(s) and DEU CONNECTION BOX(es) until the maintenance message stops: ASM 237306
DEU-B [300RH6] and DEU CONNECTION BOX [308RH6] ,
DEU CONNECTION BOX [308RH2] ,

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 308RHxx and the DEU CONNECTION/ TERMINATION BOX 308RHxx/309RHxx ASM 237306.
Do the test given in Para. 3.

b If there is no short circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-400-001.
Do the test given in Para. 3.

Subtask 23-73-00-810-142-M ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message CIDS MID BUS R/ DIR1 (101RH):

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 COM/CIDS/ DIR ESS/ 2,
49VU: 18WH AIR COND/ CIDS/SDF/ DIR 2 ESS,
120VU: 156RH COM NAV/ CIDS/ DIR NORM/ 2,
122VU: 14WH AIR COND/ CIDS/ SDF/ DIR NORM/ 2,
wait for approx. 120 s,
do the CIDS2 Interface and Power-Up Test via the CFDS/MCDU AMM 23-73-00-740-005.

(1) If the test is OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(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,
49VU: 18WH AIR COND/ CIDS/SDF/ DIR 2 ESS,
120VU: 156RH COM NAV/ CIDS/ DIR NORM/ 2,
122VU: 14WH AIR COND/ CIDS/ SDF/ DIR NORM/ 2,
install the DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(3) If the test is OK:

install a new DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(4) If the fault continues:

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001,
open these CBs:
49VU: 153RH COM/CIDS/DEU B/ESS
120VU: 162RH COM NAV/CIDS/DEU B/NORM
make sure that the resistance (line to line) at DIR-CIDS (101RH) and (102RH) connector AA/A14 and connector AA/B14 is between approx. 80 and 140 ohms ASM 237306.

(5) If the resistance (line to line) is between approx. 80 and 140 ohms:

make sure that the resistance (line to GND) is not less than 7 k ohms (short circuit) between:
DIR-CIDS (101RH) and (102RH) connector AA/A14 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B14 and GND. ASM 237306

(a) If there is no short circuit:

remove the DEU-B [300RH6] AMM 23-73-47-000-001,
install the DIR-CIDS (101RH) and DIR-CIDS (102RH) AMM 23-73-34-400-001.
close these CBs:
49VU: 153RH COM/CIDS/DEU B/ESS
120VU: 162RH COM NAV/CIDS/DEU B/NORM
Do the test given in Para. 3.

1 If the test gives the maintenance message DEU-B 300RH8:

install a new DEU-B [300RH8] AMM 23-73-47-400-001.
Do the test given in Para. 3.

2 If the test gives the maintenance message CIDS MID BUS R/ DIR1 (101RH):

install the removed DEU-B [300RH8] AMM 23-73-47-400-001.
do the steps 4. B. (5) (a) again for the subsequent DEU(s) until the maintenance message stops: ASM 237306
DEU-B [300RH6]

(b) If there is a short circuit:

remove the DEU-B [300RH8] AMM 23-73-47-000-001,
do a check for a short circuit again.

1 If there is no short circuit:

install a new DEU-B [300RH8] AMM 23-73-47-400-001.
Do the test given in Para. 3.

2 If the fault continues:

disconnect the electrical connector from the DEU TERMINATION BOX [309RH2] .
do a check for a short circuit again.

a If there is no short circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.
Do the test given in Para. 3.

b If the fault continues:

install the removed DEU-B [300RH8] AMM 23-73-47-400-001,
reconnect the electrical connector to the DEU TERMINATION BOX [309RH2] ASM 237306,
remove the DEU-B [300RH6] AMM 23-73-47-000-001,
do a check for a short circuit again.
b.1. If there is no short circuit:
install a new DEU-B [300RH6] AMM 23-73-47-400-001,
Do the test given in Para. 3.
b.2. If the fault continues:
disconnect the electrical connector from the DEU CONNECTION BOX [308RH6] ,
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 disconnected connector between pin 9 and GND (pin 4) and between pin 10 and GND (pin 4).
b.2.1.1. If there is a short circuit:
repair the wiring between the DEU CONNECTION BOX [308RH6] and the DEU TERMINATION BOX [309RH2] ASM 237306.
Do the test given in Para. 3.
b.2.1.2. If there is no short circuit:
install a new DEU CONNECTION BOX [308RH2] AMM 23-73-42-400-001,
Do the test given in Para. 3.
b.2.2. If there is a short circuit:
install the removed DEU-B [300RH6] AMM 23-73-47-400-001,
reconnect the electrical connector to the DEU CONNECTION BOX [308RH6] ,
do the steps (4. B. (5) (b) 2 b) again for the subsequent DEU(s) and DEU CONNECTION BOX(es) until the maintenance message stops: ASM 237306
DEU CONNECTION BOX [308RH2] .

(6) If the resistance (line to line) is more than 140 ohms (open circuit):

disconnect the electrical connector from the DEU TERMINATION BOX [309RH2] ,
make sure that the resistance (line to line) is not more than 140 ohms (open circuit) between:
DEU TERMINATION BOX [309RH2] pin A/1 and pin A/2

(a) If there is an open circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.
Do the test given in Para. 3.

(b) If there is no open circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [309RH2]
disconnect the electrical connector from the DEU CONNECTION BOX [308RH2] .
do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A14 and the DEU TERMINATION BOX connector pin A/2,
DIR-CIDS (101RH) connector AA/B14 and the DEU TERMINATION BOX connector pin A/1.

1 If there is no continuity:

repair the wiring between the DIR-CIDS (101RH) and the connector ASM 237306.
Do the test given in Para. 3.

2 If there is continuity:

do a check of the wiring (continuity-check) between:
DEU CONNECTION BOX [308RH2] pin A/1 and pin A/9 ,
DEU CONNECTION BOX [308RH2] pin A/2 and pin A/10.

a If there is no continuity:

install a new DEU CONNECTION BOX [308RH2] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.
Do the test given in Para. 3.

b If there is continuity:

reconnect the connector to the DEU CONNECTION BOX [308RH2]
do the steps 4. B. (6) again for the subsequent DEU CONNECTION/ TERMINATION BOX(es) until the maintenance message stops:
DIR-CIDS (101RH) and DEU CONNECTION BOX [308RH6] /connector,
DIR-CIDS (101RH) and DEU TERMINATION BOX [309RH2] /connector.

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

remove the DEU-B [300RH8] AMM 23-73-47-000-001,
do a check for a short circuit again.

(a) If there is no short circuit:

install a new DEU-B [300RH8] AMM 23-73-47-400-001,
Do the test given in Para. 3.

(b) If there is a short circuit:

install the removed DEU-B [300RH8] AMM 23-73-47-400-001,
diconnect the electrical connector from the DEU TERMINATION BOX [309RH2] 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 [309RH2]
do the steps 4. B. (7) again for the subsequent DEU(s) and DEU CONNECTION BOX(es) until the maintenance message stops: ASM 237306
DEU-B [300RH6] and DEU CONNECTION BOX [308RH6] ,
DEU CONNECTION BOX [308RH2] ,

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 308RHxx and the DEU CONNECTION/ TERMINATION BOX 308RHxx/309RHxx ASM 237306.
Do the test given in Para. 3.

b If there is no short circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-400-001.
Do the test given in Para. 3.

Subtask 23-73-00-810-142-Q ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message CIDS MID BUS R/DIR1 (101RH):

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, 1 [101RH] AMM 23-73-34-000-001,
close these CBs:
49VU: 157RH COM/CIDS/ DIR ESS/ 2,
49VU: 18WH AIR COND/ CIDS/SDF/ DIR 2 ESS,
120VU: 156RH COM NAV/ CIDS/ DIR NORM/ 2,
122VU: 14WH AIR COND/ CIDS/ SDF/ DIR NORM/ 2.
wait for approx. 120s,
do the CIDS2 Interface and Power-Up Test via the CFDS/MCDU AMM 23-73-00-740-005.

(1) If the test is OK:

install a new DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(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,
49VU: 18WH AIR COND/ CIDS/SDF/ DIR 2 ESS,
120VU: 156RH COM NAV/ CIDS/ DIR NORM/ 2,
122VU: 14WH AIR COND/ CIDS/ SDF/ DIR NORM/ 2.
install the DIR-CIDS, 1 [101RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(3) If the test is OK:

install a new DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
Do the test given in Para. 3.

(4) If the fault continues:

remove the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001.
open these CBs:
49VU: 153RH COM/CIDS/DEU B/ESS,
120VU: 193RH COM NAV/CIDS/DEU B/NORM FWD,
2001VU: 194RH COM NAV/CIDS/DEU B/NORM AFT.
make sure that the resistance (line to line) at DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] connector AA/A14 and connector AA/B14 is between approx. 80 and 140 ohm ASM 237306.

(5) If the resistance (line to line) is between approx. 80 and 140 ohm:

make sure that the resistance (line to GND) is not less than 7k ohm (short circuit) between:
DIR-CIDS (101RH) and (102RH) connector AA/A14 and GND,
DIR-CIDS (101RH) and (102RH) connector AA/B14 and GND. ASM 237306

(a) If there is no short circuit:

remove the DEU-B [300RH6] AMM 23-73-47-000-001,
install the DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
close these CBs:
49VU: 153RH COM/CIDS/DEU B/ESS,
120VU: 193RH COM NAV/CIDS/DEU B/NORM FWD,
2001VU: 194RH COM NAV/CIDS/DEU B/NORM AFT.
Do the test given in Para. 3.

1 If the test gives the maintenance message DEU-B [300RH8] :

install a new DEU-B [300RH8] AMM 23-73-47-400-001.
Do the test given in Para. 3.

2 If the test gives the maintenance message CIDS MID BUS R/DIR1 (101RH):

install the removed DEU-B [300RH8] AMM 23-73-47-400-001.
do the steps 4. B. (5) (a) again for the subsequent DEU(s) until the maintenance message stops: ASM 237306
DEU-B [300RH6]
DEU-B [300RH4]

(b) If there is a short circuit:

remove the DEU-B [300RH8] AMM 23-73-47-000-001,
do a check for a short circuit again.

1 If there is no short circuit:

install a new DEU-B [300RH8] AMM 23-73-47-400-001.
Do the test given in Para. 3.

2 If the fault continues:

disconnect the electrical connector from the DEU TERMINATION BOX [309RH2] ,
do a check for a short circuit again.

a If there is no short circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.
Do the test given in Para. 3.

b If the fault continues:

install the removed DEU-B [300RH8] AMM 23-73-47-400-001,
reconnect the electrical connector to the DEU TERMINATION BOX [309RH2] ASM 237306,
remove the DEU-B [300RH6] AMM 23-73-47-000-001,
do a check for a short circuit again.
b.1. If there is no short circuit:
install a new DEU-B [300RH6] AMM 23-73-47-400-001.
Do the test given in Para. 3.
b.2. If the fault continues:
disconnect the electrical connector from the DEU CONNECTION BOX [308RH6] ,
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 disconnected connector between pin 9 and GND (pin 4) and between pin 10 and GND (pin 4).
b.2.1.1. If there is a short circuit:
repair the wiring between the DEU CONNECTION BOX [308RH6] and the DEU TERMINATION BOX [309RH2] ASM 237306.
Do the test given in Para. 3.
b.2.1.2. If there is no short circuit:
install a new DEU CONNECTION BOX [308RH2] AMM 23-73-42-400-001.
Do the test given in Para. 3.
b.2.2. If there is a short circuit:
install the removed DEU-B [300RH6] AMM 23-73-47-400-001,
reconnect the electrical connector to the DEU CONNECTION BOX [308RH6] ,
do the steps (4. B. (5) (b) 2 b) again for the subsequent DEU(s) and DEU CONNECTION BOX(es) until the maintenance message stops: ASM 237306
DEU-B [300RH4] and DEU CONNECTION BOX [308RH4] ,
DEU CONNECTION BOX [308RH2] .

(6) If the resistance (line to line) is more than 140 ohm (open circuit):

disconnect the electrical connector from the DEU TERMINATION BOX [309RH2] ,
make sure that the resistance (line to line) is not more than 140 ohm (open circuit) between:
DEU TERMINATION BOX [309RH2] pin A/1 and pin A/2.

(a) If there is an open circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-000-001 and AMM 23-73-43-400-001.
Do the test given in Para. 3.

(b) If there is no open circuit:

reconnect the electrical connector to the DEU TERMINATION BOX [309RH2] ,
disconnect the electrical connector from the DEU CONNECTION BOX [308RH2] ,
do a check of the wiring (continuity-check) between:
DIR-CIDS (101RH) connector AA/A14 and the DEU TERMINATION BOX connector pin A/2,
DIR-CIDS (101RH) connector AA/B14 and the DEU TERMINATION BOX connector pin A/1.

1 If there is no continuity:

repair the wiring between the DIR-CIDS (101RH) and the connector ASM 237306.
Do the test given in Para. 3.

2 If there is continuity:

do a check of the wiring (continuity-check) between:
DEU CONNECTION BOX [308RH2] pin A/1 and pin A/9 ,
DEU CONNECTION BOX [308RH2] pin A/2 and pin A/10.

a If there is no continuity:

install a new DEU CONNECTION BOX [308RH2] AMM 23-73-42-000-001 and AMM 23-73-42-400-001.
Do the test given in Para. 3.

b If there is continuity:

reconnect the connector to the DEU CONNECTION BOX [308RH2] ,
do the steps 4. B. (6) again for the subsequent DEU CONNECTION/ TERMINATION BOX(es) until the maintenance message stops:
DIR-CIDS (101RH) and DEU CONNECTION BOX [308RH6] /connector,
DIR-CIDS (101RH) and DEU CONNECTION BOX [308RH4] /connector,
DIR-CIDS (101RH) and DEU TERMINATION BOX [309RH2] /connector.

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

remove the DEU-B [300RH8] AMM 23-73-47-000-001,
do a check for a short circuit again.

(a) If there is no short circuit:

install a new DEU-B [300RH8] AMM 23-73-47-400-001,
Do the test given in Para. 3.

(b) If there is a short circuit:

install the removed DEU-B [300RH8] AMM 23-73-47-400-001,
disconnect the electrical connector from the DEU TERMINATION BOX [309RH2] 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 [309RH2] ,
do the steps 4. B. (7) again for the subsequent DEU(s) and DEU CONNECTION BOX(es) until the maintenance message stops: ASM 237306
DEU-B [300RH6] and DEU CONNECTION BOX [308RH6] ,
DEU-B [300RH4] and DEU CONNECTION BOX [308RH4] ,
DEU CONNECTION BOX [308RH2] .

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 308RHxx and the DEU CONNECTION/ TERMINATION BOX 308RHxx/309RHxx ASM 237306.
Do the test given in Para. 3.

b If there is no short circuit:

install a new DEU TERMINATION BOX [309RH2] AMM 23-73-43-400-001.
Do the test given in Para. 3.

Subtask 23-73-00-810-143-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-B (300RHxx) AMM 23-73-47-400-001.
Reconnect all the DEU-mount-connectors to the related DEU-mounts (2011VUxx/2015VUx) AMM 23-73-48-400-001.

Subtask 23-73-00-810-143-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-B (300RHxx) AMM 23-73-47-400-001.
Reconnect all the DEU CONNECTION/ TERMINATION BOX-connectors to the related DEU CONNECTION/ TERMINATION BOX (308RHxx/309RHxx) ((Ref. AMM 23-73-42/43-400-00100)).

Subtask 23-73-00-710-259-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:38:59 UTC