Panasonic SB-WA840EB Service Manual ▷ View online
7.2.7. Replacement of Power IC and
Transistor
Follow Step (1) to Step (5) described in section 7.2.4.
Follow Step (1) to Step (3) described in section 7.2.5.
Follow Step (1) to Step (3) described in section 7.2.5.
Step 1: Desolder the Power IC and Transistor terminal.
Step 2: Remove 2 screws and Power IC501.
Step 3: Remove the screw and Transistor holder.
Step 3: Remove the screw and Transistor holder.
Step 4: Detach the Power IC and Transistor from Heat sink.
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SB-WA840EB
8 Voltage Measurement and Waveform Chart
Note:
· Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-impedance)
with the chassis taken as standard.
Therefore, there may exist some errors in the voltage values, depending on the internal impedance of the DC circuit tester.
· Circuit voltage and waveform described herein shall be regarded as reference information when probing defect point
because it may differ from actual measuring value due to difference of Measuring instrument and its measuring condition
and product itself.
and product itself.
8.1. Voltage Measurement
14
SB-WA840EB
Ref No.
MODE E C B E C B E C B E C B
CD PLAY 0 0.1 0.8 0 3.5 -0.2 6.0 12.1 6.6 0 0.8 0
STANDBY 0 5.9 0 0 3.5 -0.3 5.9 11.5 6.5 0 0 0
Ref No.
MODE 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CD PLAY 0 0 64.0 -64.0 0 31.3 -31.3 0 0.1 0
0
0
0
-0.2 31.5 -31.6 -10.5 0 0 64.0
STANDBY 0 0 14.8 0.3 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
14.8
Ref No.
MODE 21 22 23 24 25 26
CD PLAY -64.0 0
0
0
0
0
STANDBY 0.3 0
0
0
0
0
Ref No.
MODE E C B E C B 1 2 3 E C B E C B
CD PLAY 0 5.1 0 0 5.1 0 0 0.1 -1.3 0 0.8 0 0.8 0 0.8
STANDBY 0 0.7 0 0 0.7 0 0 0 0 0 0 0 -0.2 0 -0.2
Ref No.
MODE E C B E C B E C B E C B E C B
CD PLAY 5.2 31.5 5.7 -11.3 -31.5 -11.9 0 -1.3 0 0 -11.3 0.2 -11.3 5.1 -11.3
STANDBY 0.4 -0.2 -0.2 0 0 0 0 -0.1 0 0 0 0 0 0.4 0
Ref No.
MODE E C B E C B E C B E C B
CD PLAY 5.2 - 4.7 4.7 5.2 - 0 0.4 -0.2 0.4 5.2 0
STANDBY 0.4 0 0.1 0.5 0.4 0 0 0.3 0 0.3 0.7 0
Q512 Q553
Q556
Q520 Q552
Q503
Q515
AC INLET P.C.B.
Q516
Q554 Q555 Q557
Q501
Q511
Q519
POWER P.C.B.
IC501
IC501
Q502
Q517
Q505 Q506
8.2. Waveform
CN501 PIN 1
CD PLAY
17.8Vp-p (10msec.div)
CN501 PIN 3
CD PLAY
17.4Vp-p (10msec.div)
CN501 PIN 21
CD PLAY
5.16Vp-p (10msec.div)
CN501 PIN 22
CD PLAY
6.64Vp-p (10msec.div)
CN501 PIN 24
CD PLAY
6.36Vp-p (10msec.div)
CN503 PIN 1
CD PLAY
129Vp-p (10msec.div)
CN503 PIN 3
CD PLAY
65.6Vp-p (10msec.div)
CN503 PIN 7
CD PLAY
65.2Vp-p (10msec.div)
CN503 PIN 9
CD PLAY
130Vp-p (10msec.div)
CN501 PIN 8
CD PLAY
1.06Vp-p (10msec.div)
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SB-WA840EB
9 Block Diagram
D502
D501
Q516
SYNC
PCONT
POWER CONTROL
CIRCUIT
POWER CONTROL/PROTECTION CIRCUIT
26
(25)
22
23
18
(19)
20
15
3
6
1
(2)
9
13
14
7
4
21
16
8
5
12(11)
24
SWITCHING
INTERFACE
SWITCH
SWITCH
SYNC
SWITCH
-
+
-
+
-
+
-
+
SL(R)/SURRL(R)
SUBWO/SUBWOOFER
CIN
FLIN(R)
SUBIN
SLIN(R)
+DI SENS
+VD
+VCC HI
+VCC LOW
FL_O(R)
C_O
SUB_O
SL_O(R)
IN GND
DISP HMUT
AC IN
IH DET
-VCC LOW
-VCC HI
-VD
-DI SENS
FL(R)/FRONTL(R)
CCH/CENTRE
Q517
VOLTAGE
REGULATOR
F1
Z501
SWITCH
DC_DET
INTERFACE
SWITCH
HP_CNT/MUTE_H
Q515,Q519
DCDET
SWITCH
VOLTAGE
REGULATOR
D597
D598,D599
T501
T502
D508
AC2(5)/SUBAC2
AC1(4)/SUBAC1
TO MAIN
BLOCK
(JK2000) OF
SA-HT840EB-S,
FL1
FL2
FL2
B
B
D527~D530
B
VOLTAGE
REGULATOR
POWER HIC
SIGNAL LINES
IC501
RSN311W64D-P
JK500
AC INLET
RLY501
POWER
TRANSFORMER
SUB
TRANSFORMER
JK502
CENTRE
SPEAKER
SUBWOOFER
JK501
FRONT
SPEAKER
JK501(JK502)
SURROUND
SPEAKER
FAN
MOTOR
DRIVE
L500
( ) Indicates Pin No. of Right Channel
Note : Signal Lines are applicable to the Left Channel only.
B
B
B
B
B
B
: MAIN SIGNAL LINE
B
B
B
M
A
E500
Q511
Q501,
Q502
Q552~Q557
Q503
Q520
Q506
Q505
FILTER
FILTER
FILTER
FILTER
Q512
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SB-WA840EB
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