S 865-009
(2)
Remove electrical power if it is no longer necessary
(AMM 24-22-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
DUAL SELCAL DECODER UNIT - REMOVAL/INSTALLATION
_______________________________________________
1. General_______
A. AIRPLANES WITH A NA134-D2 DECODER; the dual SELCAL decoder unit is on shelf No. 2 of the E2 electronics equipment rack.
B. AIRPLANES WITH A N1401 DECODER; The dual SELCAL decoder unit is on shelf No. 3 of the E1 electronics equipment rack.
TASK 23-28-11-024-001
2. SELCAL Decoder Unit Removal___________________________
A. Access
(1) Location Zone
205 Electronic Compartment
B. Procedure
S 864-018
(1) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a)
P18 Load Control Center - Left
1) SELCAL-1
(b)
P6 Load Control Center - Right
1) SELCAL-2
S 024-017
(2) Remove the SELCAL Decoder Unit:
(a)
Loosen the fastener.
(b)
Pull out the SELCAL decoder unit.
TASK 23-28-11-424-005
3. SELCAL Decoder Unit Installation________________________________
A. References
(1) 23-28-00/501, SELCAL System - Adjustment/Test
B. Access
(1) Location Zone
205 Electronic Compartment
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737-300/400/500MAINTENANCE MANUAL
C. Procedure
S 424-014
(1) Install the SELCAL Decoder Unit:
(a)
Move the SELCAL decoder unit into the rack.
(b)
Install the fastener.
(c)
Put the correct SELCAL code on the No. 1 and the No. 2 decoders.
NOTE: You can identify the airplane SELCAL code on a placard
____ found on the main instrument panel.
S 864-009
(2)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a)
P18 Load Control Center - Left
1) SELCAL-1
(b)
P6 Load Control Center - Right
1) SELCAL-2
(3)
Do this task: "SELCAL System Test", (Ref 23-28-00/501).
S 714-012
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A
737-300/400/500MAINTENANCE MANUAL
SELCAL CONTROL PANEL - REMOVAL/INSTALLATION
___________________________________________
1. General_______
A. The SELCAL control panel is installed on the forward electronics control panel. The panel is installed with four fasteners and is electrically connected by a cable behind the unit.
TASK 23-28-21-024-001
2. SELCAL Control Panel Removal____________________________
A. Access
(1) Location Zone
101/102 Control Cabin
B. Procedure
S 864-018
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
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