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5ymptom
TROUBLESHOOTING
Possible Cause/Remedv
Display does not light and there is no sound when
power is on
Volume control: Maximum (MAX)
Squelch control: Fully counterclockwise (CCW)
Display lights but there is no sound
Volume control: MAX
Squelch control: CCW
Sound comes out but display does not light
Volume control: MAX
Squeich control: CCW
Does not scan and squelch does not operate
• Detective AC line cord:
Replace.
• Detective power transtormer T801:
Replace.
• Detective ON-OFF switch on volume control VR801:
Replace.
• Detective rectitier 047:
Replace.
• Detective voltage regulator circuit:
Replace the detective components.
• Detective speaker or headphone jack:
Replace.
• Detective audio amplitier IC7 and/or associated circuit:
Replace the detective components.
• Detective IF amplitier IC1, IC2, and/or associated cir-
cuit:
Replace the detective components.
• Detective squelch control 040, IC5, and/or associated
circuit:
Replace the detective components.
• Detective AF pre-amplitier ICS and/or associated circuit:
Replace the detective components.
• Detective audio mute switching IC5, ICS, and/or associ-
ated circuit:
Replace the detective components.
• Detective switching circuit IC5, 038, 039, and/or associ-
ated circuit:
Replace the detective components.
• Detective selector IC12:
Replace.
• IC501 is running "wild":
Press RESTART switch.
• Detective initiate control 0501:
Replace.
• Detective voltage regulator IC9, 02S, 045, and/or asso-
ciated circuit:
Replace the detective components.
• Detective LCD:
Replace.
• Detective CPU IC501 and/or associated circuit:
Replace the detective components.
• Detective switching circuit IC5:
Replace.
• Detective IC2 and/or associated circuit:
Replace the detective components.
• Detective CPU IC501 and/or associated circuit:
Replace the detective components.
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