Pioneer DVH-3900MP/XZ/EW5 Service Manual page 26

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CAUTION - Tip for repair
A
Before exchange power amp IC(TB2904) for no audio problem, you have to check
below list.
1. Check VCC (pin 20, 6) & GND
2. Check input pin 11, 12, 14, 15
B
3. Check Standby, pin 4
: Follow the below list.
4. Check Mute function, pin 22
: Follow the below list.
Stand-by
ON
OFF
C
5. Check Ripple pin 10.
: Normally it is high (about 10V)
Mute
TE
L 13942296513
ON
OFF
6. Re-soldering all the pin of IC.
: Prevent crack of solder line.
D
* Keep changed IC, We request that you send it to HQ.
E
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http://www.xiaoyu163.com
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Power Sound Voltage
OFF OFF 0 to 1.5
ON ON 3.5 to 6 V
Sound Voltage
OFF 0 to 1.5
ON 3.5 to 6 V
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DVH-3900MP/XZ/EW5
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http://www.xiaoyu163.com
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8
1
TAB
IN1
11
C
1
IN2
12
C
1
AC-GND
16
C
6
IN3
15
C
1
Q Q
3 6 7 1 3
IN4
14
C
1
PRE-GND
13
RIP STBY
10
Picture 1) Power IC desc.
u163
.
3
4
2 9 9 4 2 8
20 6
V V
CC1 CC2
OUT1 + ( )
9
PW-GND1 8 R
L
OUT1 ( ) -
7
OUT2 ( )
+
5
PW-GND2 2 R
L
OUT2 ( ) -
3
OUT3 ( ) +
17
PW-GND3 18 R
L
OUT3 ( )
-
19
1 5 0 5 8 2 9 9 4
OUT4 ( ) +
21
PW-GND4 R
24
L
OUT4 ( ) -
23
OFF-SET
MUTE
DET
4 25 22
PLAY
R
1
MUTE
: PRE-GND
: PW-GND
m
co
4
9 9
2 8 9 9
5 V