-28-Volt Regulator Adjustment

11-6625-467-34

b. Using the module extender board, extend RF

() on the circuit card and adjust R18 for +27.5 volts

amplifier/detector/switch circuit card HV3 above

dc on the ME-202/U.

the card cage.

g. Remove the extender card and replace the

+28-volt deregulator circuit in the card cage.

c. Connect power to the equipment and set the

POWER switch to ON.

3-19. --28-Volt Regulator Adjustment

d. Pull the shaft of interlock switch S12 to the

override position.

Perform the following procedures to adjust the

e. S e t t h e P O W E R S E L E C T O R s w i t c h t o

28-volt regulator:

NORMAL.

a. Remove the test set from the case.

f. Set the CIRCUIT SELECTOR switches to

b. Using the module extender board, extend

0500.

28-volt regulator card HU3 above the card cage.

g. C o n n e c t t h e A N / G R M - 5 0 ( v h f s i g n a l

c. Connect power to the equipment and set the

generator) RF output to the RF VM 1 jack on the

POWER switch to ON.

d. Pull the shaft of interlock switch S12 to the

test set and set up the generator to produce a 3-

MHz, 63-millivolt, unmodulated output.

override position.

h. Push the PRESS TO TEST button on the test

e. S e t t h e P O W E R S E L E C T O R s w i t c h t o

set and adjust R1 on the circuit card for a reading of

NORMAL.

90 percent on the TEST METER.

f Connect the ME-202/U between J2 () and J3

(+) and adjust R6 on the circuit card for 27.5 volts

i. Increase the frequency of the AN/ GRM-50 to

65-MHz. (Insure that the output is still 63

dc on the ME-202/U.

millivolts. )

g. Remove the module extender board and re-

j. Press the PRESS TO TEST button and adjust

place the 28-volt regulator card in the card cage.

capacitor C5 on the circuit card for a reading of 90

3-20. Audio Amplifier/Detector Gain

percent on the TEST METER.

Adjustment

k. Repeat procedures given in g through j a b o v e

until no further adjustment is necessary.

P e r f o r m the following procedures to adjust the

l. Remove the extender card and replace the RF

audio amplifier/detector gain:

a. Remove the test set from the case.

amplifier/detector/switch circuit card in the card

b. Using the module extender board, extend the

cage.

audio amplifier/detector circuit card HU7 above the

3-22. 150-Hz Oscillator/Counter Adjustment

card cage.

Perform the following procedures to adjust the 150-

c. Connect power to the equipment and set the

Hz oscillator/counter:

POWER switch to ON.

a. Remove the test set from the case.

d. Pull the shaft of interlock switch S12 to the

b. Using the module extender board, extend 150-

override position.

Hz oscillator/counter circuit card HU8 above the

e. S e t t h e P O W E R S E L E C T O R s w i t c h t o

card cage.

NORMAL.

c. Connect power to the equipment and set the

f. Set the CIRCUIT SELECTOR switches to

POWER switch to ON.

2200.

d. Pull the shaft on interlock switch S12 to the

g. Connect the ME-30A/U (ac voltmeter) be-

override position.

tween J2 and ground on the audio amplifier/detec-

e. S e t t h e P O W E R S E L E C T O R s w i t c h t o

tor circuit card and adjust the 1 KC AMPL control

NORMAL.

on the front panel of the test set for 15 millivolts on

f. Set CIRCUIT SELECTOR switches to 3241.

the ME-30A/U.

g. Connect the AN/USM-26 (frequency counter)

h. Push the PRESS TO TEST button on the test

to J4 on the circuit card.

set and adjust R11 on the circuit card for a reading

of 70 percent on the TEST METER.

Table 3-5. Capacitor Frequency Adjustment

i. R e m o v e t h e m o d u l e e x t e n d e r b o a r d a n d

replace the audio amplifier/detector circuit card in

the card cage.

3-21. RF Amplifier/Detector Gain and

Frequency Response Adjustment

Perform the following procedures to adjust the RF

amplifier/ detector:

a. Remove the test set from the case.

3-44