Realistic trc-448 Service Manual page 27

Symptom
Possible Cause
16)
Modulation indicator does not flash on AM.
MOD : OK
A) Defective Q218, D226, D227 and/or associated circuit
components
B) Defective modulation indicator lamp
17)
Meter lamp does not turn on in RX.
A) Defective D229
18) Meter lamp does not turn on in MON/PA
A) Defective D230
19) RX AGC and SSB TX ALC does not work
A) Defective Q214 and/or associated circuit components
20)
Noise blanker and ANL does not work.
A) Defective IC-201, Q226, Q228,D236. D237, D238,
D239 and/or associated circuit components
B) Defective D216 and/or associated circuit components
C) Defective NB switch
21) PA does not work.
CB : OK
A) Defective PA—CB switch
B) Defective PA jack
22) RF control does not work.
A) Defective Q220, D253 and/or associated circuit
components
23) CLARIFIER does not work.
A) Defective D12,D13, D14 and/or associated circuit
components
B) Defective VR-304 and/or VR-2
I