Technics SL-PJ37A

No
HF signal turned
into SRF signal?
‘Ui DSL circuit failure:
¢ {C501
‘D FO error amp. failure:
*1C6501,6504
Focus servo locked?
— SRF signal check method —
Verify
that
the
SRF
signal
is
present
at
pin @® of 1C501.
‘T: Microprocessor failure:
10401
2) Control system failure:
¢ 1C6501,6504
3) TR error amp. failure:
°1C6501 ,6503,6504
@ Pickup failure:
* Radial coil
SRF signal
synchronized
with PCK?
No
‘T) PLL circuit failure:
Radial
servo
locked?
¢
10301,
1C501
— Synchronization check method —
Trigger the oscilloscope with the RF
signal(TJ306)and observe the PCK at
Yes | TJ303.
lf phase synchronization is establish-
ed, the FPC at 1C301’s pin @) will be
regulated to approx. 2.4V.
CLV servo
entered the Phase
Compare mode?
No] }. CLV circuit failure:
¢1C301
HF (RF) Signal
present?
UL AGC circuit failure {RF Amp.)
°1C6501
— AGC circuit check method —
Verify that HF signal amplitude at |
TJ306 is 1.0V p-p ~ 1.4Vp-p.
EFM signal and
PCK clock outputs
present?
No} i PLL circuit failure:
* 1C501
— EFM and PCK check method —
Check the waveform of EFM at IC 501 pin
@ and that of PCK at 1C501 pin ©.
Yes
Audio signal
(digital)
output present?
No} Digital circuit failure:
Play operation
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