TEST PROCEDURE - TM-11-5820-670-300134

TM 11-5820-670-30

2-20. C-7088/ARC-131 MODE SWITCH SELECTION AND FRONT PANEL ILLUMINATION TEST.

(CONT)

TEST PROCEDURE

Set C-7088/ARC-131 MODE SWITCH to OFF and SQUELCH switch to DIS.

Set frequency selectors on C-7088/ARC-131 for 30.95 MHz.

Swing open amplifier modulator assembly on receiver-transmitter to permit viewing of MHz indi-

cator on gearbox assembly.

Swing open if. amplifier assembly on receiver-transmitter to permit viewing kHz indicator on

gearbox assembly.

Place test set +28 VDC ON-OFF switch to ON.

Adjust variable power source for + 27.5 VDC as indicated on INPUT VOLTAGE meter.

Place test set PILOT-ON switch to ON.

STANDARD. Control panel lamps illuminate.

8. If control panel lamps do not illuminate, see troubleshooting chart 2-24, item 1.

9. Set C-7088/ARC-131 MODE SWITCH to T/R.

10. Observe TEST METER indication on receiver-transmitter.

STANDARD. Midscale indication on TEST METER.

11. If TEST METER indication is not at midscale, see troubleshooting chart 2-24, item 2.

12. Set C-1611 D/AIC Transmit-lnterphone selector to 1.

13. Set C-1611 D/AIC RECEIVER 1 to ON and adjust VOL fully clockwise.

14. Set test set TRANSMIT switch to MOM.

STANDARD. Receiver-transmitter power supply blower motor should run.

15. If blower motor is not operating, see troubleshooting chart 2-24, item 3.

16. Set test set TRANSMIT switch to OFF.

17. Set ME-26 D/U FUNCTION switch to + and set RANGE for 30 V.

18. Set C-7088/ARC-131 MODE SWITCH to HOME.

19. Connect test probe from the ME-26 D/U to TP4504 located on rf control assembly of receiver-

transmitter.

STANDARD. + 27.5 VDC at TP4504.

20. If the voltage level at TP4504 is not 27.5 vdc, see troubleshooting chart 2-24, item 4.

2-42