TM 55-4920-428-13
c. Connect power cable 145GS278-4 to POWER receptacle and output receptacle of the auto-
transformer. Connect the autotransformer to 115-volts 60 Hz ac power source.
d. Adjust the output of the autotransformer to 115-volts ac.
e. Set the multimeter to measure dc volts at terminal board TB4(fig 4-1), connect it to terminal
TB4-12 (+) and TB4-1.
f. Set the power switch to ON.
g. (See fig. 4-2.)
On circuit board PS 1, adjust -V ADJ variable resistor R26 until the multi meter
indicates -12. 0-volts dc.
h. Set the power switch to OFF.
i. Disconnect the multimeter and the power cable from the autotransformer.
j. Perform the power supply and DVM tests. (Ref para 4-40.)
k. Install the panel. (Ref para 4-41.)
l. Perform the final test. (Ref para 4-42.)
4-37. Adjustment of +12-Volt Dc Power Supply PS1. (CRC)
a. Remove the panel. (Ref para 4- 18.)
b. Ensure the power switch is at OFF.
c. Connect power cable 145GS278-4 to POWER receptacle and output receptacle of the auto-
transformer. Connect the autotransformer to 115-volts 60 Hz ac power source.
d. Adjust the output of the autotransformer to 115-volts ac.
e. Set the multimeter to measure dc volts. At terminal board TB4 (fig. 4-1) connect it to terminals
TB4-11 (+) and TB4-1.
f. Set the power switch to ON.
g. (See fig. 4-2.) On circuit board PS1, adjust +V ADJ variable resistor R14 until the multimeter
indicates 12.0 volts dc.
h. Set the power switch to OFF.
i. Disconnect the multimeter and the power cable from the autotransformer.
j. Perform the power supply and DVM tests. (Ref para 4-40.)
k Install the panel. (Ref para 4-41.)
l. Perform the final test. (Ref para 4-42.)
4-38. Adjustment of 28-Volt Dc Power Supply PS2. (CRC)
a. Remove the panel. (Ref para 4-18.)
b. Ensure the power switch is at OFF.
c. Connect power cable 145GS278-4 to the POWER receptacle and output receptacle of the auto-
transformer. Connect the autotransformer to 115-volts 60 Hz ac power source.
d. Adjust the output of the autotransformer to 115-volts ac.
e. Set the multimeter to measure dc volts. On terminal board TB4 (fig. 4-1), connect it to terminals
TB4-10 (+) and TB4-1.
f. Set the power switch to ON.
4-13
