Technics SL-P200

(Operation Sequence Just After Power On)
Power On
(no disc loaded)
@ Power supply failure:
¢ Voltage regulator IC (IC11,
13, 104, Q11, 12)
¢ IC protector (IC1, 2, ICP11,
12)
@ Microprocessor failure:
© 1C601, 401
FL display came on?
@ Microprocessor failure:
© 1C401, 601
@ Loading motor driver failure:
© Q401, 402, 1C402, motor
@ Close switch failure
Tray closed?
@ Traverse control system
failure:
© 1C102, traverse coil
© 1C103, 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, 601)
Has the tray opened
and stopped?
@ Operation key switch failure
@ Tray open switch failure
Yes
Load a disc and press
the Open/Close switch.
@ Microprocessor failure
(IC401)
Has the tray closed
and stopped?
@ Operation key switch failure
@ Tray close switch failure
Yes
@ Pickup failure:
e Laser diode
No| @ Control system failure:
©1C101, Q101
@ Microprocessor failure:
Laser diode came on?
© 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.
Yes
@ Microprocessor failure:
10401
@ Control system failure:
© 10101, 102
Does focus lens
make vertical
movements? @ FO error amp. failure:
©1C101, 102, 103
@ Pickup failure:
¢ Focus coil
Yes
@ Microprocessor failure:
°1C401
No| @ T.T. drive system failure:
© 1C301, 402, Q351
© Q403, 404
Spindle motor
Spindle motor
started rotation?
Yes
Focus servo locked?
No] © FO error amp. failure:
©1C101, 104
Yes
@ Microprocessor failure:
¢1C401
@ Control system failure:
©1C101, 102
@ TR error amp. failure:
©1C101, 102, 103
@ Pickup failure:
© Tracking coil
Tracking servo locked?
Yes
@ Microprocessor failure:
¢1C401
@ Traverse amp. failure:
©1C101, 102, 103
traverse coil
— Traverse servo checking method —
e Track skip occurs at inervals of a few
seconds during play.
e Pickup moves back and forth
between the innermost and
outermost tracks.
e Pickup moves to the innermost or
outermost track and stops there.
No @ Microprocessor failure:
°1C401
No
Traverse servo
operation normal?
Yes
Has DSL circuit
entered the
Normal mode?
¢ Verify that 1IC102’s pin 31 is set to
Low.
Yes
RF signal
amplitude regulated
at the output of
AGC circuit?
NO} @ AGC circuit failure:
¢1C101
— AGC circuit check method —
Verify that the ARF signal amplitude at
pin 35 of IC101 is 0.5Vp-p.
Yes
— DSL circuit Normal mode check method —
SL-P200
ARF signal turned
into SRF signal?
@ DSL circuit failure:
e 10102
— SRF signal check method —
Verify that the SRF signal is present at
pin 19 of 1C102.
Yes
SRF signal
synchronized
with PCK?
No
@ PLL circuit failure:
© 10301, 102
— Synchronization check method —
Trigger the oscilloscope with the RF
signal (TJ101) and observe the PCK at
pin 20 of 1C102.
If phase synchronization is establish-
ed, the FPC at IC301’s pin 78 will be
regulated to approx. 2.5V.
No} @ CLV circuit failure:
e 1C301
— Phase Compare mode check method —
Verify that the CLVS at pin 77 of IC301
is set to High.
Yes
CLV servo
entered the Phase
Compare mode?
Yes
‘EFM signal and
PCK clock outputs
present?
No
@ PLL circuit failure:
— EFM and PCK check method —
Check the waveform of EF M at 1C102’s
pin 21 and that of PCK at 1C102’s pin
Yes 20.
@ DF/DAC circuit failure:
¢ 1C801
@ Low-pass filter circuit
failure:
© 1C803, 804
© IC805, 806
Audio signal
Output present?
Play operation