Technics SL-PJ37A

(Operation Sequence Just After Power On)
Power On
(no disc loaded)
@ Power supply failure:
* Voltage regulator (1C11,
12,Q13 ~ 16)
¢1C protector (ICP1,2,11,12)
@ Microprocessor failure:
* 10401
FL display came on?
@ Microprocessor failure:
°1C401
@ Loading motor driver failure:
©1C402, motor
@ Tray switch failure
Tray closed?
@® Radia! control system
failure:
e1C6504, Radial motor
¢ 1C401, potentiometer
Does optical
pickup move toward
inner track?
Stops after making focus pull-
in.operation for approx. 5 sec.
(TOC Read Operation-PLAY Operation)
Open/Close switch
pressed.
@ Microprocessor failure
(1C401}
@ Operation key switch failure
@ Tray switch failure
Has the tray opened
and stopped?
Load a disc and press
the Open/Close switch.
@ Microprocessor failure
(10401)
@ Operation key switch failure
@ Tray switch failure
Has the tray closed
and stopped?
@ Pickup failure:
¢ Laser diode
No] @ Control system failure:
« 1C6501, 06502
@) Microprocessor failure:
© 10401
— Laser diode turn-on check method —
Remove the disc then close the tray,
and the laser diode will come on for
approx. 5 sec.
Laser diode came on?
Yes
(D Microprocessor failure:
¢1C401
@ Control system failure:
*!C6501
@ FO error amp. failure:
* 1C6501, IC6504
@ Pickup failure:
* Focus coil
Does focus lens
make vertical
movements?
@ Microprocessor failure:
© 10401
No! @T.T. drive system failure:
¢ 10301, 402, Q351
Turntable motor
Spindle motor
started rotation?
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