(2)  
ET (elapsed time) switch

 (3)  
CHR button

 (4)  
P/N 2610-07-1 CLOCKS;
 DATE button

 (5)  
GMT display

 (6)  
ET/CHR display

 TASK 31-25-00-715-022
 2.  Operational Test - Clocks_________________________
 A.  Standard Tools and Equipment
 (1)  Stopwatch
 B.  References
 (1)  AMM 24-22-00/201, Manual Control (Apply Power)
 C.  Access
 (1)  Location Zones
 101 Control Cabin, LH
 102 Control Cabon, RH

 D.  Procedure
 S 865-023
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-024

 (2)  
Make sure these circuit breakers are closed:

 (a)  P6 Load Control Center
 1) CLOCK
 2) CLOCK DISPLAY

 S 715-031
 (3)  Do the test of the time function for each clock:
 (a)  Set the clock to a time of 18:58:
 1)  Set the GMT switch to FS until 18 shows in the hour display.
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737-300/400/500MAINTENANCE MANUAL
 2)  Set the GMT switch to SS until 58 shows in the minutes display.
 (b)  
Set the GMT switch to the HLD position. 1) After a few minutes, make sure the display still shows

 18:58.

 (c)  
Set the GMT switch to the RUN position. 1) Make sure the display still shows 18:58. 2) Make sure the clock keeps time correctly for a few minutes.

 S 715-033
 (4)  P/N 2610-07-1 CLOCKS; Do the test of the date function for each clock:
 (a)  
Set the clock to a date of 12/28/88: 1) Push the DATE button. 2) Set the GMT to FS D until 28 shows in the day display. 3) Set the GMT switch to SS M until 12 shows in the month

 display. 4) Set the GMT switch to HLD Y until 88 shows in the year display.

 (b)  
Set the GMT switch to RUN.

 1)  Make sure the date shows in the display and alternates between day/month display and year display.

 (c)  
Push the DATE button. 1) Make sure the time shows in the GMT display. 2) Make sure that the time has advanced from the previous

 display.
 S 715-034
 (5)  Do the test of the elapsed time and chronograph functions for each clock:
 (a)  
Turn the ET switch to the reset position.

 (b)  
Simultaneously set the ET switch to RUN and start the stopwatch. 1) Make sure the ET/CHR display starts counting seconds and

 minutes from zero.

 (c)  
Push the CHR button. 1) Make sure the sweep second hand starts clockwise rotation. 2) Make sure the ET/CHR display shows 0. 3) After one minute, make sure the ET/CHR display changes

 to 1.

 (d)  
Push the CHR button a second time. 1) Make sure the sweep second hand stops. 2) Make sure the ET/CHR display doesn't change after a minute.

 (e)  
Push the CHR button a third time. 1) Make sure the sweep second hand goes back to zero (60). 2) Make sure the ET/CHR display now shows the elapsed time.

 (f)  
Look at the stopwatch.

 1)  Make sure the elapsed time on the ET/CHR display and the stopwatch agree.

 (g)  
Turn the ET switch to RESET and release.
 1) Make sure the ET/CHR display goes to zero.

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A 737-300/400/500MAINTENANCE MANUAL
 (6)  S 865-036Set the clocks to the correct GMT and date.
 (7)  S 865-035Remove electrical power if it is not necessary (AMM 24-22-00/201).

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