DC POWER: ON.
Disconnect headset H-101A/U from the MK-994/AR at HEADSET 2.
Adjust your URM-127 audio oscillator for 1000 Hz, 0.6 volts RMS output.
COMM CONT 2 HOT MIKE switch to HOT MIKE position.
Perform the following voltage measurements.
Using your ME-30 (AC voltmeter) measure the amplitude between K1 terminal 7
and ground. The normal reading should be 2.15 - 3.35 volts RMS. Should your reading be
abnormal, this would indicate that relay K1 be replaced and then repeat the functional test.
TERMINALS 1 AND 2 of AR1 ARE AT B+ POTENTIAL. USE A MEASURING
DEVICE NOT HAVING A COMMON GROUND WITH THE POWER SOURCE.
USE A GROUND ISOLATING TRANSFORMER WHEN USING AC POWERED
TEST EQUIPMENT TO PREVENT DAMAGE TO THE C-6533 UNDER TEST.
Using the ME-30, measure the amplitude of the signal between AR1 terminal 2
(microphone amplifier board) and ground. (See Figure 9.) A normal reading is 6 to 9 volts
RMS. If you have a normal reading you would replace transformer T2 and repeat the
Figure 9. AR1 terminals.