(b)
Make sure the DC ammeter shows a load.
S 865-047
(29) Push the switch S2 to the INDICATE position.
(a) Make sure that the BATT, the EXT PWR TR, and the TR 3 lights on the M238 come on.
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737-300/400/500MAINTENANCE MANUAL
S 865-051
(30) Turn the dc meter switch to the BAT BUS position.
(a) Make sure that the voltmeter shows 20 to 28 volts.
S 865-054
(31) Open this circuit breaker and attach the DO-NOT-CLOSE tag:
(a) P6-4 Panel
1) C808, TR UNITS NO. 3
S 865-055
(32) Push the switch S2 to the INDICATE position.
(a) Make sure that the TR 3 light on the M238 goes off.
S 865-058
(33) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) P6-4 Panel
1) C807, TR UNITS NO. 2
S 865-059
(34) Remove DO-NOT-CLOSE tags and close these circuit breakers.
(a) P6-5 Panel
1) C31, DC BUS POWER NO. 1
2) C23, DC BUS INDICATION BUS NO. 1
S 865-060
(35) Push the switch S2 to the INDICATE position.
(a) Make sure that the BATT, the EXT PWR TR, and the DC BUS PWR ON
-NO. 1 light on the M238 come on.
S 865-061
(36) Set the dc meter switch to the TR 1 position.
(a)
Make sure that the voltmeter shows 22 to 30 volts dc.
(b)
Make sure that the ammeter shows that there is a load.
S 865-063
(37) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P6-5 Panel 1) C27, DC BUS POWER - NO. 2 2) C24, DC BUS INDICATION - BUS NO. 2/GALLEY PWR CONT
S 865-064
(38) Push the switch S2 to the INDICATE position.
(a) Make sure that the DC BUS PWR ON - NO. 2 light on the M238 stays off.
S 865-065
(39) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P6-4 Panel
1) C1065, DC BUS 1
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737-300/400/500MAINTENANCE MANUAL
2) C1066, DC BUS 2
S 865-066
(40) Push the switch S2 on the M238 to the INDICATE position.
(a) Make sure that the DC BUS PWR ON - NO. 2 light on the M238 panel comes on.
S 865-067
(41) Open this circuit breaker and attach the DO-NOT-CLOSE tag:
(a) P6-4 Panel
1) C806, TR UNITS NO. 1
S 865-068
(42) Push the switch S2 on the M238 to the INDICATE position.
(a)
Make sure that the DC BUS PWR ON - NO. 1 and NO. 2 lights go off.
(b)
Make sure that the DC BUS PWR ON - NO. 2 light stays off.
S 715-069
(43)
Make sure that the dc voltmeter shows 0 volts.
S 865-070
(44)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:
(a) P6-4 Panel
1) C1065, DC BUS 1
2) C1066, DC BUS 2
S 865-113
(45) Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) P6-4 Panel
1) C807, TR UNITS NO. 2
S 865-071
(46) Push the switch S2 on the M238 to the INDICATE position.
(a) Make sure that the DC BUS PWR ON - NO. 1 light stays off.
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