Radio Shack PRO-60 Service Manual page 16

Symptom
Possible Cause/Remedy
Sound does not come out in AM mode but
NFM and WFM operate
• Defective 1C 1:
Replace.
• Defective switching circuit (IC303, 1C305) and/or
associated circuit:
Replace the defective components.
Sound does not come out in AM and NFM
modes but WFM operates
• Defective IC301 and/or associated circuit:
Replace the defective components.
Sound does not come out in WFM mode but
AM and NFM operates
• Defective IC1:
Replace IC1.
• Defective switching circuit (IC303, IC305, Q303, Q304,
Q306) and/or associated circuit:
Replace the defective components.
Sound does not come out in WFM and AM
modes but NFM operates
• Defective IC102 and/or associate circuit:
Replace the defective components.
• Defective switching circuit (IC303, IC305) and/or
associated circuit: Replace the defective components.
Low sensitivity between 30.000 and 87.495
MHz
• Defective decoder switching circuit (Q101):
Replace Q101.
• Defective bandpass filter (BPF):
Replace the defective components.
Low sensitivity between 87.5 and 174 MHz
• Defective switching circuit (Q102):
Replace Q102.
• Defective BPF:
Replace the defective components.
Low sensitivity between 174.005 and 350 MHz
• Defective switching circuit (Q102):
Replace Q102.
• Defective BPF:
Replace the defective components.
Low sensitivity between 350 and 512 MHz
• Defective switching circuit (Q103):
Replace Q103.
• Defective BPF:
Replace the defective components.
Low sensitivity between 760 and 999.9875
MHz
• Defective switching circuit (Q103):
Replace Q103.
• Defective BPF:
Replace the defective components.
Does not operate between 30 and 512 MHz
• Defective QUO and/or VC01 circuit:
Replace the defective components.
Does not operate between 760 and 999.9875
MHz
• Defective Q113 and/or VC02 circuit:
Replace the defective components.
Ail bands do not operate but display is OK.
• Defective PLL (IC101, IC102, IC1) and/or associated circuit:
Replace the defective components.
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