Technics SL-P202A - Page 46

HF signal turned
into SRF signal?
1 FO error amp. failure:
*1C6501,6504
@ DSL circuit failure:
Focus servo locked?
¢ 1C501
— SRF signal check method —
Verify that the SRF signal is present at
2 of IC501
1: Microprocessor failure:
°1C401
‘2 Control system failure:
© 1C6501,6504
3: TR error amp. failure:
_ *1C6501,6503,6504
‘4 Pickup failure:
¢ Radial coil
SRF signal
synchronized
with PCK?
1) PLL circuit failure:
¢ 10301, 1C501
Radial servo locked?
— 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.
No] 4: CLV circuit failure:
© 1C301
CLV servo
entered the Phase
Compare mode?
1 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.
HF(RF) Signal
present?
EFM signal and
PCK clock outputs
present?
NO} 1 PLL circuit failure:
© 10102
— EFM and PCK check method —
Check the waveform of EFM at IC 501 pin
5 and that of PCK at IC501 pin 3.
Yes
1: DF/DAC circuit failure:
¢ iC801
‘2; Low-pass filter circuit
failure:
* 1C803,802.
¢ 1C805,806
Audio signal
output present?
Play operation
Printed in Japan
Pons ee K881206150YY/TN