Sony STR-DA1000ES Service Manual page 106

STR-DA1000ES/DB790
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2. ELECTRICAL ADJUSTMENT 3 7 63 1515 0
BIAS ADJUSTMENT
Condition:
input signal: no signal (no load)
volume: minimum
Connection
CN432 (CN482, 532, 582, 632, 682, 732) pin 1
CN432 (CN482, 532, 582, 632, 682, 732) pin 2
Procedure:
1. Connect a digital voltmeter to the CN432 (CN482, CN532,
CN582, CN632, CN682) on the MAIN board or CN732 on
the SBL board (STR-DA1000ES only).
2. Press the button to turn on the main power.
I/1
3. Adjust the RV431 (RV481, RV531, RV581, RV631, RV681)
on the MAIN board or RV731 on the SBL board (STR-
DA1000ES only) so that the digital voltmeter reading is 8±2
mV.
Note: When the adjusting voltage is higher than 8±2 mV, adjust the voltage
to the minimum voltage.
Adjustment and Connection Loacation:
– MAIN BOARD (Component Side) –
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L 13942296513
RV431
CN432
2 1
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digital voltmeter
+
–
CN482
RV481
RV631
CN632
2 1
2 1
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2 9
8
– SBL BOARD (Component Side) –
RV734
Q Q
3 6 7 1 3 1 5
CN532
RV681 RV531
CN682
2 1
2 1
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9 4 2 8
1
CN732
2
0 5 8 2 9 9 4 2 8
RV581
CN582
2 1
m
9 9
9 9