Zenith XBV243 series Service Manual - Electrical
VR168 - 923-03485
3-4
D35E COMBO - ELECTRICAL
ELECTRICAL
TROUBLESHOOTING (CONTINUED)
YES
YES
YES
NO
YES
YES
YES
YES
NO
N
O
N
O
NO
NO
NO
NO
YES
YES
YES
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
Does the SW30 waveform
appear at IC501
Pin24?
Do the T-UP Reel Pulses
appear at IC501 Pin4?
Replace Ic501.
(2) The unstable loading of a Cassette tape
Is 12V applied to
PMC01 Pin8?
The unstable loading of a
Cassette tape
Does the “H” signal appear
at Ic501 Pin57 during
inserting the CST ?
Does the “L” signal appear
at Ic501 Pin19 during
inserting the CST?
Check the Deck
Mechanism.
Check the CST SW and
the peripheral circuitry.
Refer to “SMPS DRUM
12 Volt Trouble Shooting”.
Is 5.3V applied to
R544 ?
Refer to SMPS 5.3VA
troubleshooting.
Check IC501
Pins74, 75, 76, 77.
Caution: Auto stop can occur because Grease or Oil is dried up
Check the Drum Motor
signal.
Does 5.2V appear at
RS501?
Check the Q116 Power
Circuit.
Do T/UP Reel Pulses
appear at Q514
Base terminal ?
Replace the T/UP Reel
Sensor (RS501).