TM 11-6625-2837-14&P-7 TECHNICAL MANUAL OPERATOR'S ...

Section 8 TM 11-6625-2837-14 & P-7
SERVICE SHEET 7 (Cont’d)
Test 3. Check the reference diode A1OVR1, and Reference
Amplifier AlOUl and their associated components. If the unit
responds only to the local control or responds to remote
control and not to the VERNIER, check the LCL/RMT input
and the relay. If the reference output is incorrect in remote
mode only, check the 1 dB Step Attenuator, relays, transistor
switches, and other associated components. Small changes
in RF Output level may be traceable to defective components
coupled to the 10H input. If it was found that the amplitude
modulation level varies with RF Output level, check the
components associated with the AM Gain input. If the AM
drive signal is reaching the RF Section, verify that it is
reaching the A10 Assembly circuitry. Determine which
component or part is defective, repair or replace it.
Figure 8-17. A3 ALC Amplifier Assembly Component and Test Point Locations
8-28B