Technics SL-PJ27 - Page 31

SL-PJ27
No
ARF signal turned
into SRF signal?
@® DSL circuit failure:
9
Focus
servo
locked?
©
(C102
No! @ FO error amp. failure:
©1C101, 103
— SRF signal check method —
Verify that the SRF signal is present at
pin (9 of 1€102.
Yes
Yes
@ Microprocessor failure:
¢1C401
@ Control system failure: :
Tracking
servo
locked?
©1C101,
102
Rietieatere
No!
@
oe
j . e
@TR
error
amp.
failure:
with
PCK?
;
©1C101, 102, 103
@ Pickup failure:
¢ Tracking coil
— Synchronization check method —
Trigger the oscilloscope with the RF
signal (TJ101) and observe the PCK at
Yes | pin @ of 1C102.
If phase synchronization is establish-
ed, the FPC at 1C301’s pin @ will be
regulated to approx. 2.4V.
Yes
@ Microprocessor failure:
¢1C401
@ Traverse amp. failure:
© 10101, 102, 103
traverse coil
— Traverse servo checking method —
e Track skip occurs at inervals of a few
seconds during play.
¢ Pickup moves back and forth
between the innermost and
outermost tracks.
¢ Pickup moves to the innermost or
outermost track and stops there.
No! @ Microprocessor failure:
© 1C401
— DSLcircuit Normal mode check method —
¢ Verify that 1C102’s pin 8) is set to
Low.
CLV servo
entered the Phase
Compare mode?
NO] @ CLV circuit failure:
© 1C301
Traverse servo
operation normal?
Yes
EFM signal and
PCK clock outputs
present?
Has DSL circuit
entered the
Normal mode?
NO} @ PLL circuit failure:
e1C102
— EFM and PCK check method —
Check the waveform of EFM at |C102’s |
| pin @) and that of PCK at IC102’s pin
Yes \ @.
Yes
@ DF/DAC circuit failure:
¢ 1C801, 802
@ Low-pass filter circuit
failure:
© |C803
RF signal
amplitude regulated
at the output of
AGC circuit?
Audio signal
output present?
NO] @ AGC circuit failure:
°1C101
— AGC circuit check method —
Verify that the ARF signal amplitude at
Yes © be @) of 1C101 is 0.4Vp-p.
Play operation
3
;
4