AUDIO AND SQUELCH PREAMPLIFIER A4300 ALINEMENT.

TM 11-5820-401-34-3/0967-LP-432-3060

3-20. SILICON VERSION IF DISCRIMINATOR A4200A ALINEMENT. (CONT)

1. Turn AN/URM-103 DEVIATION control clockwise until DEVIATION KHZ meter reads 8 kHz.

2. Set ME-30(*)/U to l-volt scale.

3. Lift A4000 tray (1). (See test setup diagram

4. Connect ME-30(*)/U positive lead to TP4007 (2), and negative lead to ground.

5. Adjust L4202 (3) for maximum indication on ME-30(*)/U.

AUDIO AND SQUELCH PREAMPLIFIER A4300 ALINEMENT.

3-21.

PURPOSE. This procedure adjusts the gain of the A4300 assembly.

TEST EQUIPMENT AND MATERIALS

Matching Unit CN-901/U

Signal Generator AN/URM-103

T-Connector UG-274/U

Frequency Counter AN/USM-207

Loudspeaker LS-454/U

Power Supply PP-1104(*)/G

Voltmeter ME-30(*)/U

Maintenance Kit MK-1978/VRC

TEST SETUP. Connect the equipment as shown in test setup diagram

. Remove R-442/ VRC

bottom cover. (See paragraph 2-7.)

POSITION/SETTING

CONTROL OR SWITCH

EQUIPMENT

ON-RESET

R-442/VRC

POWER

BAND

MC-TUNE-KC

30.00

VOLUME

Fully clockwise

NEW OFF

SQUELCH

3-107