(b)  
If the replacement test failed, then continue.

 (2)  
Do a check of the wiring from the applicable squib to the CARGO FIRE panel.

 (a)  
If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Push the TEST switch on the CARGO FIRE panel. 3) Make sure the EXT FWD and AFT lights on the CARGO FIRE

 panel come on.
 a) If the lights come on, then you corrected the fault.

 (b)  
If you do not find a problem with the wiring, then continue.

 (3)  
Replace the CARGO FIRE panel. These are the tasks:
 Cargo Fire Control Panel Removal
 (AMM 26-00-02/401)
 Cargo Fire Control Panel Installation
 (AMM 26-00-02/401)

 (a)  Make sure the EXT FWD and AFT lights on the CARGO FIRE panel come on when the TEST switch is pushed. 1) If the lights come on, then you corrected the fault.
 3.  Discharge Light - Fault Isolation_________________________________
 A. Description
 (1)  
This task is for the DISCH light on the CARGO FIRE panel.

 (2)  
The DISCH light comes on when low pressure is detected in a fire bottle.

 B. Possible Causes
 (1)  Fire bottle
 (a)  Bottle 1 M2248
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 C.
D.
E.
F.
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737-300/400/500MAINTENANCE MANUAL
 (b)  AIRPLANES WITH ETOPS;
 Bottle 1 M2263

 (2)  
CARGO FIRE panel P8-75

 (3)
WiringCircuit Breakers

 (1)  
This is the primary circuit breaker related to the fault:

 (a)  Circuit Breaker Panel, P18-2:
 1) CARGO FIRE EXT 1

 2)  AIRPLANES WITH ETOPS;
 CARGO FIRE EXT 2

Related Data
 (1)  
SSM 26-23-11

 (2)
WDM 26-23-11Initial Evaluation

 (1)  
On the CARGO FIRE panel, make sure the DISCH light is off.

 (2)  
If light is on, then do the Fault Isolation Procedure below.

 (3)
If the light is off, then there was an intermittent fault.Fault Isolation Procedure

 (1)  
Do this check of the fire bottle:

 (a)  
Remove the connector from the applicable pressure switch on the fire bottle.

 (b)  
If the light goes off, then replace the fire bottle.

 1)  These are the tasks: Cargo Fire Extinguisher Bottle Removal (AMM 26-23-01/401) Cargo Fire Extinguisher Bottle Installation (AMM 26-23-01/401) a) If the DISCH light goes off, then you corrected the
 fault.
 (c)  If the light stays on, then continue.
 (2)  Do this check of the wiring:
 (a)  
Remove the connector from the CARGO FIRE panel.

 (b)  
If the light goes off, then do these steps: 1) Repair the wiring. 2) Re-connect the connector to the pressure switch. 3) Re-connect the connector to the CARGO FIRE panel. 4) If the BOTTLE DISCHARGED light goes out, then you corrected

 the fault.

 (c)  
If the light stays on, then continue.

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A
737-300/400/500MAINTENANCE MANUAL
 (3)  Replace the CARGO FIRE panel. These are the tasks:
 Cargo Fire Control Panel Removal
 (AMM 26-00-02/401)
 Cargo Fire Control Panel Installation
 (AMM 26-00-02/401)

 (a)  If the DISCH light goes off, then you corrected the fault.
 4.  Cargo Fire Bottle Did Not Discharge When The DISCH Switch Was Pushed -______________________________________________________________________ Fault Isolation_______________
 A.  Description
 (1)  
This task is for the fire extinguishing system when the DISCH switch on the CARGO FIRE panel is pushed, but there is no indication that the fire bottle discharged.
　
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