VSX-74TXVi
233
5
6
7
8
5
6
7
8
C
D
F
A
B
E
7.1.11 DISASSEMBLY
4
3
1
2
3
2
1
6
5
4
4
2
5
3
1
C4202
IC4202
C4206
C4201
C4204
R4203
R4201
C4203
D4201
C4205
IC4201
R4205
4201
R4208
R4206
C4209
C4210
D4204
D4206
D4208
Q4203
Q4203
D4210
D4212
D4216
D4214
C4208
D4213
D4215
Q4202
Q4202
C4207
D4211
D4209
Q4201
D4207
D4205
Q4201
D4203
R4207
CN4202
0.1/100
CFTLA
7A
AEK7021
470/100
0.1/100
CFTLA
MUF
(1/4W)
47
1000p
(1/4W)
10
MUF
AEK7021
7A
1000p
S1WB(A)60SD
470/100
51048-0600
LMF
(1/2W)
3.3k
LMF
(1W)
4.7k
220/100
220/100
*
8R2(B)
8R2(B)
UMD2N
UMD2N
6R8(B)
15(B)
13(B)
100/63
*
13(B)
UMD2N
UMD2N
*
13(B)
100/63
6R8(B)
RN1901
RN1901
9R1(B)
9R1(B)
LMF
LMF
(1W)
4.7k
*
(1/2W)
3.3k
52151-0510
-67V
VHa
VLa
VLa
VHa
SECONDARY
TRANS
+67V
-VH
-C
-B
-58V
+B
+C
+VH
9R1(B)
/7R5(B)
+58V
12(B)
/15(B)
12(B)
/15(B)
15(B)
12(B)
9R1(B)
D4214
D4213,
8R2(B)
10(B)
D4204
D4203
7R5(B)
AWX8647
AWX8646
10(B)
/8R2(B)
*
OTHERS
/KU
D4203-D4204
D4213-D4214:UDZS***
VH-
NECK6
V-12A
NECK8
VH+
GAMP
TRANS 2-1 ASSY
U
POWER AMP IN
ASSY
VH TR ASSY
VH REGULATOR
23
24
25
26
27
C4209
C4210
TRANS 2-1 ASSY
1
Discharge C4209 and C4210 on the TRANS 2-1 Assy.
Note:
For discharging, use a load of 100
Ω
, 3W or more, to protect the IC protectors. Do NOT discharge instantly by short-circuiting.
2
Check that the voltage between the electrodes of each C4209 and C4210 is 1V or less.
3
Mount the Power Amp Block.
When the Power Amp Block is removed, discharge C4209 and C4210 on the TRANS 2-1 Assy, as indicated below.
If you don't, the IC protectors (IC4261 and IC4262) on the VH TR Assy may be open, and DC voltage may be generated at the power
amplifier output, which will result in "AMP ERR."
[Procedure]
1. How to discharge when the Power Amp Block is removed
Note :
Even if the unit shown in the photos and illustrations in this manual may differ from your product, the procedures
described here are common.