Zenith ABV341 Series, Service Manual

Page: 135 / 190

MECHANISM TROUBLESHOOTING GUIDE
4-23
Auto REW doesn't work.
Is the supply to the END sensor
END sensor "H"?
“H”: more than 3.5V
“L”: less than 0.7V~1V
Is the voltage across IR LED
between 0.8~1.5V?
Replace LED.
Is the Vcc. voltage of End
sensor 5V?
Check the syscon power.
Replace End sensor.
Check syscon circuit.
NO
YES
YES
YES
NO
NO
NO
1.Deck Mechanism
A.
NO
NO
NO
No F/R modes.
Is the present mode,
F/R Mode?
Is the mode SW assembled
correctly (refer to Pages 4-14.)
Is the normal voltage supplied to
the Capstan Motor Vcc1, Vcc2.?
Check Servo, Power Circuits.
Replace the Capstan Motor.
Does the Capstan Motor rotate?
Is terminal voltage (Vctl) of Capstan
Motor supply side more than 4V?
Does the T/Up, Supply Reel
rotate?
Check syscon circuit.
YES
YES
YES
YES
YES
YES
B.