Adjustment - Pioneer S-W1EX Service Manual

5

6. ADJUSTMENT

1. When exchanging MOS FET Q421, Q431, Q441, Q451 (IRFB23N15D)
When necessary
to confirm
2. When exchanging IC421, IC441 (IR2011S)
3. When exchanging D AMP ASSY (AWU8170)
Setting of the model
How to confirm
1
2
PROCEDURE
1. Touch the instrument probe to naked terminal or land (V1, V2) as picture 1, 2, 3.
2. Turn on the unit and wait about 1 minute.
3. Rotate VR321 and adjust to DC 0 V ± 20mV.
5
6
AC rating power supply
Power : ON
Input signal : No signal
Main Volume : minimum
Speaker is connected to CN481.
(Or 4Ω dummy load/ open)
E
D AMP ASSY (AWU8170)
SP+
SP-
CN481
L481
DC OFFSET CHECK POINT
VR32
ADJ OUTPUT DC OFFSET
FRONT SIDE
S-W1EX
6
7
3
4
D AMP ASSY
7
8
A
B
C
D
E
F
39
8