Sony TC-WE425 / TC-WE525 / TC-WR681 Service Manual ▷ View online
– 13 –
Adjustment Location: main board
RV131
(L)
RECORD BIAS
ADJ
(DECK B)
RV231
(R)
RV316 (HIGH)
TAPE SPEED ADJ
(DECK A)
(DECK A)
RV317 (NORMAL)
RV416 (HIGH)
RV417 (NORMAL)
BIAS
CONSUMPTION
CURRENT
ADJ (DECK B)
TAPE SPEED ADJ
(DECK B)
T131
(L)
T231
(R)
RV111
(L)
PLAYBACK LEVEL
ADJ (DECK A)
PLAYBACK LEVEL
ADJ (DECK B)
RV211
(R)
RV121
(L)
RV221
(R)
TP431
RV261
(R)
RECORD LEVEL ADJ
(DECK B)
RV161
(L)
RV318
TAPE SPEED ADJ
(PITCH CONTROL)
(TC-WE525 only)
1
3
–main board (component side)–
– 14 –
5-1. IC PIN DESCRIPTION
• IC801 CXP82220-051Q (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Pin Description
1
A-PLAY
I
Play switch input (DECK A)
2
POWER IN (CED)
I
Power-in detection input
3
—
—
Connected to ground.
4
SIRCS
I
Sircs signal input
5
—
—
Connected to ground.
6
RECVOLOUT
O
Record level control output (PWM)
7
—
—
Not used in this set.
8
BUSIN
I
Control A signal input
9
POWER OUT
O
Power hold output
10
POWER IN (U)
I
Power-in detection input
11
A-SHUT
I
Capstan motor rotation detection input (DECK A)
12
A-SHUMIT
I
Capstan motor rotation detection input (DECK A)
13
CAPM (H/L)
O
Capstan motor high/normal select output “L”:ON
14
PITCH.CON
O
Pitch control ON/OFF output “L”:ON
15
—
—
Not used in this set.
16
BUSOUT
O
Control A signal output
17
LINE MUTE
O
Line mute ON/OFF control output “L”:Mute ON
18
LPF
O
Low pass filter on output
19
RECMUTE
O
Recording mute output “L”:Mute ON
20
B-BIAS
O
Bias ON/OFF output (DECK B) “H”:ON
21
NR SW
O
Dolby selector “H”:C, “Open”:B, “L”:Dolby off
22
B-IV
I
Metal detection input (DECK B)
23
PB SELECT (A/B)
I
Playback A/B selector input “L”:A, “H”:B
24
REC/PB
O
Record/playback dolby NR mode selector output “L”:Playback
25
PBEQ (HIGH/NORM)
O
PB EQ high/normal select output “L”:Normal
26
NR/MUTE/PASS
O
Audio selector “H”:Pass, “Open”:Mute, “L”:Dolby
27
AMSOFF/AMS/BS
O
AMS amp selector “H”:BS, “Open”:AMS, “L”:OFF
28
B-RELAY
O
Relay record/playback selector output (DECK B) “L”:Record
29
B-SHUT
I
Capstan motor rotation detection input (DECK B)
30
B-SHUMIT
I
Capstan motor rotation detection input (DECK B)
31
B-PLAY
I
Play switch input (DECK B)
32
B-HALF
I
Half switch input (DECK B)
33
METER (L)
I
Meter L-CH input (A/D converter)
34
METER (R)
I
Meter R-CH input (A/D converter)
35
KEY3
I
Key 3 input (A/D converter)
36
KEY1
I
Key 1 input (A/D converter)
37
KEY2
I
Key 2 input (A/D converter)
38
RESET
I
System reset input
39
XIN
I
System clock oscillator input (10 MHz)
40
XOUT
O
System clock oscillator output (10 MHz)
41
VSS
—
Ground
42
—
—
Connected to ground.
43
—
—
Connected to ground.
44
KEY4
I
Key 4 input (A/D converter)
45
RECVOL IN
I
Record volume input (A/D converter)
46
—
—
Connected to power supply.
47
—
—
Connected to ground.
48 – 50
—
—
Not used in this set.
51
ARL (LED)
O
AUTO LED driver “H”:ON
52
SYNC (LED)
O
SYNCHRO LED driver “L”:ON
53, 54
—
—
Not used in this set.
SECTION 5
DIAGRAMS
– 15 –
Pin No.
Pin Name
I/O
Pin Description
55
B-CAPM2
O
Capstan motor driver (DECK B)
56
B-CAPM3
O
Capstan motor driver (DECK B)
57
B-CAPM4
O
Capstan motor driver (DECK B)
58
B-CAPM1
O
Capstan motor driver (DECK B)
59
A-CAPM2
O
Capstan motor driver (DECK A)
60
A-CAPM1
O
Capstan motor driver (DECK A)
61
A-CAPM3
O
Capstan motor driver (DECK A)
62
A-CAPM4
O
Capstan motor driver (DECK A)
63 – 79
S17 – S1
O
Fluorescent indicator tube segment driver
80
—
—
Not used in this set.
81 – 87
G1 – G7
O
Fluorescent indicator tube grid driver
88
VEE
—
Fluorescent indicator tube power supply (-24 V)
89
VCC
—
Power supply (+5 V)
90
VREF
—
Connected to power supply.
91
AVSS
—
Ground
92 – 97
—
—
Not used in this set.
98
TRGAON/OFF
O
Trigger control output (DECK A)
99
TRGBON/OFF
O
Trigger control output (DECK B)
100
A-HALF
I
Half switch input (DECK A)
5-2. CIRCUIT BOARDS LOCATION
– 16 –
•
For schematic diagrams.
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
•
¢
: internal component.
•
1
: fusible resistor.
•
C
: panel designation.
•
U
: B+ Line.
•
V
: B– Line.
•
H
: adjustment for repair.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
Note:
The components identi-
fied by mark
The components identi-
fied by mark
!
or dotted
line with mark
!
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
!
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
•
For printed wiring boards.
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
•
Transistor of “B” and “C” indication is omitted.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
no mark : PB (DECK B)
(
(
) : REC (DECK B)
<
> : PB (DECK A)
[
] : STOP
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Signal path.
E
: PB (DECK A)
d
: PB (DECK B)
G
: REC (DECK B)
• Abbreviation
CND : Canadian model.
AUS
AUS
: Australian model.
SP
: Singapore model.
MY
: Malaysia model.
CH
: Chinese model.
POWER board
MAIN board
RECVOL board
H.P board (TC-WE425/WE525)
HEAD RELAY (REC) board
HEAD RELAY (PB) board
LEAF SW (B) board
DISPLAY board
DIRECTION board
(Except US, Canadian)
(Except US, Canadian)
POWER1 board
(Except US, Canadian)
(Except US, Canadian)
POWER2 board
(US, Canadian)
(US, Canadian)
LEAF SW (A) board
E C B
omitted
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