Technics SL-P222A - Page 47

SL-P222A
No
No HF signal turned
into SRF signal?
@ FO error amp. failure:
¢1C6501,6504
@ DSL circuit failure:
e 10501
Focus servo locked?
i
— SRF signal check method —
Verify that the SRF signal is present at
2 of 1C501
Yes
@ Microprocessor failure:
°1C401
@ Control system failure:
¢ 1C6501,6504
@) TR error amp. failure:
*1C6501,6503,6504
@ Pickup failure:
¢ Radial coil
SRF signal
synchronized
with PCK?
No! 7% PLL circuit failure:
¢1€301,1C501
Radial servo locked?
i
— Synchronization check method —
Trigger the oscilloscope with the RF
signal (TJ306)and observe the PCK at
Yes ; TJ303.
If phase synchronization is establish-
ed, the FPC at IC301’s pin 43 will be
regulated to approx. 2.6V.
CLV servo
entered the Phase
Compare mode?
NO] >} CLV circuit failure:
1 AGC circuit failure:(RF Amp.)
¢ 1C301
°1C6501
— AGC circuit check method —
|
Verify
that
HF
signal
amplitude
at
Yes
TJ306
is
1.0V
p-p
~
1.4Vp-p.
HF (RF) Signal
present?
EFM signal and
PCK clock outputs
present?
NO] @ PLL circuit failure:
¢ 10102
— EFM and PCK check method —
Check the waveform of EFMat IC 501 “
5 and that of PCK at 1C501 pin 3.
Yes
@ DF/DAC circuit failure:
* 1C801
@ Low-pass filter circuit
failure:
¢ 1C803,802.
* 1C805,806
Audio signal
output present?
Play operation
Printed injz#pan
YY
—
57
—
K881206
5@YY/TN