26-18-00
 OVERHEAT ACCESSORY UNIT  ú ú 01 Page 201 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 862-037
 (3)  Push the LOC TEST switch to continue the test.
 (a)  The display shows code 99 when the test is completed.
 S 862-006
 (4)  Push the LOC TEST switch until the display shows no data.
 NOTE:  The display shows no data in less than 2 minutes if you do not push the LOC TEST switch.
 E. Memory Read Procedure
 S 862-007
 (1)  Push the MEM READ switch on the overheat accessory unit on the M237 compartment.
 NOTE:  As many as 10 alarm/fault codes can be kept in non-volatile memory. Code 97 shows that all codes have been read.
 S 862-008
 (2)  
Do step (1) again until all alarm/fault codes have been read and code 97 is shown.

 S 862-009

 (3)  
Push the MEM READ switch until the display shows no data.

 F. Memory Clear Procedure
 S 862-010
 (1)  Push the DISP TEST switch on the overheat accessory unit on the M237 compartment.
 (a)  Make sure the display shows code 88.
 S 862-011
 (2)  Push the LOC TEST switch on the overheat accessory unit on the M237 compartment.
 (a)  Make sure the display shows code 90, then 99.
 S 862-012
 (3)  Push the MEM READ switch until the display shows the correct alarm/fault code to remove.
 NOTE:  Alarm/fault conditions cannot be removed until the condition
____ is corrected. Ref AMM 26-18-11/501 for a list of fault codes and the corresponding sensors.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 COMPARTMENT ú

 26-18-00
 OVERHEAT ACCESSORY UNIT  ú ú 01 Page 202 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 862-035
 (4)  Push and release the MEM CLEAR switch.
 (a)  Make sure the display shows no codes.
 S 862-013
 (5)  
Do steps (3) and (4) again until the display shows 97.

 S 862-015

 (6)  
Push the MEM READ switch or the MEM CLEAR switch until the display shows no codes.

 G. Alarm History Memory Read Procedure
 S 862-016
 (1)  
Push the LOC TEST switch on the overheat accessory unit on the M237 panel until the display shows code 90, then 99.

 S 862-017

 (2)  
Push the MEM READ switch on the overheat accessory unit on the M237 compartment until the display shows code 97.

 S 862-018

 (3)  
Push and hold the DISP TEST switch and then push and hold the MEM READ switch.

 S 862-019

 (4)  
Release the DISP TEST switch.

 S 862-020

 (5)  
Release the MEM READ switch.

 (a)  The display will show the last alarm/fault history code.
 S 862-036
 (6)
Push the MEM READ switch to show the next code on the display.

 S 862-021

 (7)  
Do step (6) until the display shows code 97.

 S 862-022

 (8)  
Push the MEM READ switch until the display shows no codes.

 H. Alarm History Memory Clear Procedure
 S 862-023
 (1)  
Push the LOC TEST switch on the overheat accessory unit on the M237 compartment until the display shows code 90, then 99.

 (2)  
Push the MEM READ switch until the display shows code 97.

 (3)  
Push and hold the LOC TEST switch.

 S 862-024
 S 862-025
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH FENWAL M237 COMPARTMENT ú