Zenith XBV613 Service Manual - Page 17
SYSTEM/KEY CIRCUIT, Caution - troubleshooting
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UPC - 719192169715
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2. SYSTEM/KEY CIRCUIT (1) AUTO STOP Auto Stop YES Does the SW30 waveform NO appear at IC501 Pin18? YES Do the T-UP Reel Pulses NO appear at IC501 Pin80? YES Replace IC501. Check the Drum Motor signal. Do T/UP Reel Pulses NO appear at the point between R556 and R536? YES Replace the T/UP Reel Sensor (RS501). Does 5V appear at RS501? YES NO Check the Q165 Power Circuit. (2) The unstable loading of a Cassette tape The unstable loading of a Cassette tape YES Is 12V applied to PMC01 NO Pin1? YES Does the "H" signal appear NO at IC501 Pin60 during inserting of the CST ? YES Does the "L" signal appear at IC501 Pin19 during inserting of the CST? NO YES Check the Deck Mechanism. Check the CST SW and the peripheral circuitry. Refer to "SMPS MOTOR_Vcc 12 Volt Trouble Shooting". Is 5V applied to R531 ? YES NO Refer to SMPS 5.3VA troubleshooting. Check IC501 Pins22, 23, 24, 25. Caution : Auto stop can occur because Grease or Oil is dried up 3-6
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