Technics SL-P999 - Page 30

SS
=)
oy ES ee eae)
sit
|_|
|
SL-P999 SL-P999
(Operation Sequence Just After Power On)
Power On
(no disc loaded)
(TOC Read Operation-PLAY Operation)
Open/Close switch
pressed.
@ Power supply failure:
® Voltage regulator
©1011, 52, 104, Q12, 14, 51,
52
@ Microprocessor failure:
¢ 1C601, 401
@ Microprocessor failure
(1C401, 601)
@ Operation key switch failure
@ Tray open switch failure
Has the tray opened
and stopped?
FL display came on?
Yes
Load a disc and press
the Open/Close switch.
@ Microprocessor failure
(1C401)
@ Operation key switch failure
@ Tray close switch failure
Has the tray closed ~No
and stopped?
Yes
@ Microprocessor failure:
¢1C401, 601
@ Loading motor driver failure:
© 1C403, Q453, 454, motor
@ Close switch failure
Tray closed?
@ Pickup failure:
e Laser diode
No! @ Control system fallure:
©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
@ Traverse control system
failure:
© 1C102, traverse coil
¢1C103, potentiometer
Does optical
pickup move toward
inner track?
@ Microprocessor failure:
°1C401
@ Control system failure:
© 1C101, 102
Does focus lens
make vertical
movements? @ FO error amp. failure:
#10101, 102, 103
@ Pickup failure:
¢ Focus coil
Yes
Stops after making focus pull-
in operation for approx. 5 sec.
@ Microprocessor failure:
°1C401
No} @T.T. drive system failure:
© 1C301, 403, Q451, 452
© Q404
Spindle motor
Spindle motor
started rotation?
Yes
No
ARF signal turned
into SRF signal?
Focus servo locked?
No| @ FO error amp. failure: @ DSL circuit failure:
°1C101 ¢1C102
— SRF signal check method —
pin @ of 1C102.
Yes
Yes
@ Microprocessor failure:
¢1C401
@ Control system failure:
°1C101, 102
@ TR error amp. failure:
#10101, 102, 103
@ Pickup failure:
¢ Tracking coil
SRF signal
synchronized
with PCK?
No
@ PLL circuit failure:
Tracking servo locked? ° 10301, 102
— Synchronization check method —
Trigger the oscilloscope with the RF
signal (TJ101) and observe the PCK at
pin @ of IC102.
If phase synchronization is establish-
ed, the FPC at 1C301’s pin © will be
regulated to approx. 2.5V.
NO) 4) CLV circuit failure:
© 10301
Yes
Yes
@ Microprocessor failure:
°1C401
@ Traverse amp. failure:
©1C101, 102, 103
traverse coil
— Traverse servo checking method —
¢ Track skip occurs at intervals 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
— DSL circuit Normal mode check method —
ey that 1C102’s pin © is set to
Low.
CLV servo
entered the Phase
Compare mode?
Traverse servo
operation normal?
Verify that the CLVS at pin @ of IC301
is set to High.
Yes
Yes
EFM signal and
PCK clock outputs
present?
Has DSL circuit
entered the
Normal mode?
@D PLL circuit failure:
©1C102
— EFM and PCK check method —
Check the waveform of EFM at IC102’s
pin @ and that of PCK at 1C102’s pin
@.
Yes
Yes
‘1 DF/DAC circuit failure:
© 1C302, 304, 801~804
‘2 Low-pass filter circuit
failure:
© IC805~812
RF signal
amplitude regulated
at the output of
AGC circuit?
Audio signal
output present?
NO} 7 AGC circuit failure:
©1C101
— AGC circuit check method —
Verify that the ARF signal amplitude at
pin & of IC101 is 0.4Vp-p.
Yes
Play operation
Verify that the SRF signal is present at
|
— Phase Compare mode check method —
|