LG LGXBR342 Service Manual page 155

MECHANISM TROUBLESHOOTING GUIDE
E. In PB mode Tape presence not sensed.
Is the Pinch Roller attached
to the Capstan Motor Shaft?
YES
Does the T/Up
Reel turn?
YES
Does the Capstan Motor turn?
YES
Does the Drum
Motor turn?
YES
Check DPG and
DFG Pulses
Check T/Up 2nd Supply Reel
Sensors
Check Servo, Syscon.
NO
Check Alignment positions
(page 4-14)
NO
Is the Belt ok?
YES
Check the clutch and the Idler
Assembly.
NO
Is the Voltage supplied to the
Capstan Motor Vcc1,Vcc2 each?
YES
Is the terminal voltage of Capstan
Motor supplied more than 4V?
YES
Replace the Capstan Motor.
NO
Is the Vcc voltage of the Drum
Motor normal?
YES
Is the terminal voltage of the
Drum Motor more than 2.3V?
YES
Replace the Drum Motor.
4-25
NO
Replace the Belt.
NO
Check Servo, Power.
NO
Check Servo, Power.
NO
Check Syscon, Circuit.
NO
Check Syscon, Circuit.