ELECTRICAL TROUBLESHOOTING GUIDE
5. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
YES
Does SW waveform appear at IC501
pin23?
YES
Does T/up reel pulse appear
at IC501 Pin27?
YES
Replace IC501
(2) No cassette tape loading
No cassette tape loading
YES
Is there REG. 12V at PMCQ1
Pin8?
YES
Does 'H' signal appear at IC501
Pin62 while inserting CST?
YES
Check Deck mechanism
*Caution : Auto stop can occur because Grease or Oil is dried up
SECTION3 ELECTRICAL
NO
Check Drum motor signal
NO
Does T/up reel pulse appear
at Q514 Base terminal?
YES
Replace T/up reel sensor of deck
Check power circuit
Check CST SW and peripheral circuit
NO
Is there 5.3V at RS501?
YES
NO
Check DP06, LP03
NO
Check power circuit L104.
NO
Is there 5.3V at IC501 Pin73?
YES
Check power circuit
Check D106, L103.
NO
Check IC501 Pin7, 8, 9, 10
3-11
NO