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PDF Contains
Technical Data, Mechanical data, Detailed Circuit diagram with components value, PCB layout. Actual PCBs Print. Component List, Spare parts code list and Input output detail. It cover LBB1211, LBB1212, LBB1213, LBB1216, LBB1217.
It is the actual Service Manual for SQ10
SECTION 3 ELECTRICAL ADJUSTMENT
BIAS ADJUSTMENT
Adjustment Procedure: 1. Rotate fully the bias adjusting semi-fixed resistors (RV301 (LCH), RV351 (R-CH)) to the minimum position (counterclockwise). 2. Connect a digital voltmeter to the CN406 (L-CH) and CN407 (R-CH).
pin 1 pin 3 CN406 (L-CH) CN407 (R-CH) � + + �
Connection and Adjustment Location:
[MAIN (A) BOARD] � Component side �
3. Set the slidack to 0 V AC, and press the POWER button (ON) on the set. 4. Raise gradually the slidack voltage up to the rated voltage (230 V AC). 5. At this time, confirm that the speaker relay is turned on (it will click). 6. Adjust the RV301 (L-CH) and RV351 (R-CH) so that a reading of digital voltmeter is from 10 mV to 20 mV. 7. Return the slidack to 0 V AC, and press the POWER button (OFF) on the set.
C372 C322
RV351 (R-CH) BIAS Adjustment
RV301 (L-CH)
[MAIN (B) BOARD] � Component side �
CN407 3 1
digital voltmeter C459
+ �
C409
1
3
CN406
�7�
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