Loss of the Control Data Input 1 Bus of the Weather Radar Transceiver 1

TASK 34-41-00-810-820-A
Loss of the Control Data Input 1 Bus of the Weather Radar Transceiver 1

1. Possible Causes

XCVR-WEATHER RADAR, 1 [1SQ1]
wiring of the CP DATA INPUT 1 bus between the weather radar transceiver 1 (1SQ1) and the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-41-00-740-002	BITE Test of the Weather Radar
ASM 344101
AMM 34-41-33-000-004	Removal of the Weather Radar Transceiver
AMM 34-41-33-400-003	Installation of the Weather Radar Transceiver

3. Fault Confirmation
Subtask 34-41-00-740-086-A

A. Test
(1) Do the BITE test of the weather radar AMM 34-41-00-740-002.

4. Fault Isolation
Subtask 34-41-00-810-074-A ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message RADAR 1 NO DATA FROM EFIS1 PANEL:

(1) If the fault continues:

remove the weather radar transceiver 1
do a check and repair the wiring of the CP DATA INPUT 1 bus between the weather radar transceiver 1 (1SQ1) and the first terminal block : for pins AB/3B, 4B of the weather radar transceiver 1 ASM 344101.
install the weather radar transceiver 1.

Subtask 34-41-00-810-074-C ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message FCU (2CA) CP-L BUS/WXR1 (1SQ1):

(1) If the fault continues:

remove the weather radar transceiver 1
do a check and repair the wiring of the CP DATA INPUT 1 bus between the weather radar transceiver 1 (1SQ1) and the first terminal block : for pins AB/3B, 4B of the weather radar transceiver 1 ASM 344101.
install the weather radar transceiver 1.

Subtask 34-41-00-740-087-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:05 UTC