Sony TC-WE825S - Dual Auto Rev Cassette Deck User manual

TC-WE835S
US Model
AEP Model
UK Model
SERVICE MANUAL
MICROFILM
Sony Corporation
Home A&V Products Company
STEREO CASSETTE DECK
99C001668-1
Printed in Japan ©1999.3
Published by Quality Assurance Dept.
(Shinagawa)
• TC-WE835S is similar to the earlier TC-WE825S.
• Refer to TC-WE625/WE725/WE825S service manual (9-922-795-xx)
for information not contained in this service manual.
Items marked "*" are not stocked since they are
seldom required for routine service.
Some delay should be anticipated when ordering
these items.
Part No. Description Remark
***EXPLODED VIEWS***
38 1 *3-021-243-01 PANEL, BACK (AEP)
1*3-021-243-11 PANEL, BACK (UK)
1*3-021-243-31 PANEL, BACK (US)
40 101 X-3374-864-1 LID (A) ASSY, CASSETTE
102 X-3374-865-1 LID (B) ASSY, CASSETTE
41 151 X-3374-858-1 PANEL ASSY, FRONT (AEP, UK)
151 X-3375-510-1 PANEL ASSY, FRONT (US)
54 ***ACCESSORIES & PACKING MATERIALS***
NOT USED
3-862-713-11 MANUAL, INSTRUCTION
(ENGLISH) (US, UK)
3-862-713-31 MANUAL, INSTRUCTION
(ENGLISH, FRENCH, SPANISH,
PORTUGUESE) (AEP)
3-862-713-41 MANUAL, INSTRUCTION
(GERMAN, DUTCH, SWEDISH,
ITALIAN) (AEP)
NOT USED
NOT USED
NOT USED
9-928-857-11
Page Ref.No. TC-WE825S TC-WE835S
Part No. Description Remark
***EXPLODED VIEWS***
*3-032-411-01 PANEL, BACK (AEP)
*3-032-411-11 PANEL, BACK (UK)
*3-032-411-21 PANEL, BACK (US)
X-3376-715-1 LID (A) ASSY, CASSETTE
X-3376-717-1 LID (B) ASSY, CASSETTE
X-3376-712-1 PANEL ASSY, FRONT (AEP, UK)
X-3376-713-1 PANEL ASSY, FRONT (US)
***ACCESSORIES & PACKING MATERIALS***
1-473-598-11 REMOTE COMMANDER
(RM-J910)(US)
3-866-256-11 MANUAL, INSTRUCTION (ENGLISH)
3-866-256-21 MANUAL, INSTRUCTION
(FRENCH, SPANISH) (AEP)
3-866-256-31 MANUAL, INSTRUCTION
(GERMAN, DUTCH, SWEDISH,
ITALIAN, PORTUGUESE) (AEP)
3-866-671-11 MANUAL, INSTRUCTION
(FOR CONTROL A1 II)
(ENGLISH) (US,UK)
3-866-671-21 MANUAL, INSTRUCTION
(FOR CONTROL A1 II)
(ENGLISH, FRENCH, GERMAN,
SPANISH, DUTCH, PORTUGUESE,
SWEDISH, ITALIAN, CHINESE)(AEP)
4-981-643-01 COVER, BATTERY (FOR RM-J910) (US)
• DIFFERENCETABLE

– 1 –
Model Name Using Similar
Mechanism TC-WE505/WE605S/WE705S
TC-WE625 :TCM-190RB12CL
DECK A TC-WE725/WE825S :
Tape Transport TCM-190RB13C
Mechanism Type TC-WE625 :TCM-190RB12CL
DECK B TC-WE725/WE825S :
TCM-190RB11C
SERVICE MANUAL
US Model
TC-WE625/WE825S
Canadian Model
TC-WE625
AEP Model
UK Model
TC-WE725/WE825S
E Model
Australian Model
Chinese Model
TC-WE625
TC-WE625/WE725/
WE825S
STEREO CASSETTE DECK
MICROFILM
System
Recording system
4-track 2-channel stereo
Fast-winding time (approx.)
90 sec. (with Sony C-60 cassette)
High-speed fast-winding time (approx.) (TC-WE825S and TC-WE725
only) 45 sec. (with Sony C-60 cassette)
Bias AC bias
Signal-to-noise ratio (at peak level and weighted with Dolby NR off)
Type I tape, Sony Type I (NORMAL): 55 dB
Type II tape, Sony Type II (HIGH): 57 dB
Type IV tape, Sony Type IV (METAL): 58 dB
S/N ratio improvement (approximate values)
With Dolby B NR on: 5 dB at 1 kHz, 10 dB at 5 kHz
With Dolby C NR on: 15 dB at 500 Hz, 20 dB at 1 kHz
With Dolby S NR on (TC-WE825S only): 10 dB at 100 Hz,
24 dB at 1 kHz
SPECIFICATIONS
– Continued on next page –
Photo: TC-WE825S
Dolby noise reduction extension manufactured under license
from Dolby Laboratories Licensing Corporation.
HX Pro originated by Bang & Olufsen. “DOLBY”, the double-D
symbol aand “HX PRO” are trademarks of Dolby Laboratories
Licensing Corporation.
Harmonic distortion
0.4% (with Type I tape, Sony Type I (NORMAL):
160 nWb/m 315 Hz, 3rd H.D.)
1.8% (with Type IV tape, Sony Type IV (METAL):
250 nWb/m 315 Hz, 3rd H.D.)
Frequency response (Dolby NR off)
Tape type
Type I tape, Sony Type I 30-16,000 Hz (±3 dB, IEC),
(NORMAL) 20-17,000 Hz (±6 dB)
Type II tape, Sony Type II 30-17,000 Hz (±3 dB, IEC),
(HIGH) 20-18,000 Hz (±6 dB)
Type IV tape, Sony Type IV 30-19,000 Hz (±3 dB, IEC),
(METAL) 20-20,000 Hz (±6 dB),
30-13,000 Hz (±3 dB, –4 dB
recording)

– 2 –
Wow and flutter
±0.13% W. Peak (IEC)
0.07% W. RMS (NAB)
±0.18% W. Peak (DIN)
Variable pitch range (approx.)
–30 to +30%
Inputs
Line inputs (phono jacks)
Sensitivity : 0.16 V
Input impedance : 47 kilohms
Outputs
Line outputs (phono jacks)
Rated output level : 0.5 V at a load impedance of
47 kilohms
Load impedance : Over 10 kilohms
Headphones (stereo phono jack)
Output level : 0.25 mW at a load impedance of
32 ohms
General
Power requirements
Where purchased Power requirements
US, Canadian 120 V AC, 60 Hz
AEP, UK, Chinese 220 - 230 V AC, 50/60 Hz
Australian 240 V AC, 50/60 Hz
Singapore, Malaysia 120/220/230 - 240 VAC, 50/60 Hz
Power consumption
30 W
Dimensions (approx.) (w/h/d)
Model for UK and Australian :
430 ×120 ×310 mm (w/h/d)
(17 ×4 3/4 ×12 1/4 in.)
Model for other countries :
430 ×120 ×290 mm (w/h/d)
including projecting parts and controls
Mass (approx.)
4.3 kg (9 lbs 8 oz)
Supplied accessories
Audio connecting cords (2 phono plugs - 2 phono
plugs) (2)
CONTROLA1 cord (supplied for Canadian models
only) (1)
Design and specifications are subject to change without
notice.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINE
WITH MARK !ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE !SUR LES
DIAGRAMMES SCHÉMATIQUESETLA LISTE DESPIÈCESSONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
To Exposed Metal
Parts on Set
0.15
µ F1.5k
Ω
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Checkthe antennaterminals, metaltrim, “metallized” knobs,screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of aVOM
or battery-operatedAC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)

– 3 –
TABLE OF CONTENTS
1. GENERAL
1-1. Location of Controls ........................................................... 4
2. DISASSEMBLY
2-1. Front Panel Assy ................................................................. 5
2-2. Mechanism Deck................................................................. 5
2-3. Fitting Base ......................................................................... 6
2-4. Capstan Motor, Reel Motor................................................. 6
2-5. Head Deck Assy .................................................................. 7
3. MECHANICAL ADJUSTMENTS................................. 8
4. ELECTRICAL ADJUSTMENTS................................... 8
5. DIAGRAMS
5-1. IC Pin Description ............................................................. 12
5-2. Circuit Boards Location .................................................... 14
5-3. Printed Wiring Boards –Main Section– ............................ 15
5-4. Schematic Diagram –Main Section (1/4)– ........................17
5-5. Schematic Diagram –Main Section (2/4)– ........................19
5-6. Schematic Diagram –Main Section (3/4)– ........................21
5-7. Schematic Diagram –Main Section (4/4)– ........................23
5-8. Printed Wiring Boards –Power Section–........................... 25
5-9. Schematic Diagram –Power Section– ...............................26
5-10. Printed Wiring Boards –Panel Section– ............................ 27
5-11. Schematic Diagram –Panel Section– ................................ 29
5-12. Printed Wiring Boards –DeckA Section– .........................31
5-13. Schematic Diagram –DeckA Section– ............................. 32
5-14. Printed Wiring Boards –Deck B Section–......................... 33
5-15. Schematic Diagram –Deck B Section– .............................34
5-16. Printed Wiring Board
–DOLBY-S Section (TC-WE825S only)–........................ 35
5-17. Schematic Diagram
–DOLBY-S Section (TC-WE825S only)–........................ 35
6. EXPLODEDVIEWS
6-1. Case Section ...................................................................... 38
6-2. Chassis Section ................................................................. 39
6-3. Cassette Holder Section .................................................... 40
6-4. Front Panel Section ........................................................... 41
6-5. Tape Mechanism Section 1 ............................................... 42
6-6. Tape Mechanism Section 2 ............................................... 43
7. ELECTRICAL PARTS LIST ........................................ 44
MODEL IDENTIFICATION
–Back panel–
Part No.
Part No. Model
3-021-228-0πTC-WE625 : US model
3-021-228-1πTC-WE625 : CND model
3-021-228-2πTC-WE625 : AUS model
3-021-228-3πTC-WE625 : SP, MY model
3-021-228-4πTC-WE625 : CH model
3-021-242-0πTC-WE725 :AEP model
3-021-242-1πTC-WE725 : UK model
3-021-243-0πTC-WE825S : AEP model
3-021-243-1πTC-WE825S : UK model
3-021-243-3πTC-WE825S : US model
• Abbreviation
CND : Canadian model
AUS : Austrarian model
SP : Singapore model
MY : Malaysia model
CH : Chinese model

– 4 –
SECTION 1
GENERAL
1-1. LOCATION OF CONTROLS
1
2
3
4
56
10
798
23
22
21
20
19
18
11 1412 13 15 16 17
1. 1/u(Power) button (US, Canadian)
U(Power) button (EXCEPT US, Canadian)
2. DIRECTION MODE switch
3. PITCH CONTROL (ØON/øOFF) switch
(TC-WE725/WE825S)
4. PITCH CONTROL knob (TC-WE725/WE825S)
5. Cassette holder (Deck A)
6. COUNTER A buttons (DeckA)
RESET button
MEMORY button
7. Display window
8. COUNTER B buttons (Deck B)
RESET button
MEMORY button
9. Cassette holder (Deck B)
10. RMS buttons
RMS/START button
SET button
CHECK button
DISPLAY button
11. Tape operation buttons (Deck A)
0(AMS), RMS - button
)(AMS), RMS + button
pCLEAR (Stop) button
ªBACK (Reverse play) button
·FRONT (Foward play) button
PPAUSE button
RREC MUTING button
rREC button
12. §(Eject) button (Deck A)
13. DOLBY NR switches
ON, OFF, FILTER switch
B, C, S switch (“S” use for TC-WE825S)
14. Tape operation buttons (Deck B)
0(AMS) button
)(AMS) button
p(Stop) button
ª(Reverse play) button
·(Foward play) button
PPAUSE button
RREC MUTING button
rREC button
15. §(Eject) button (Deck B)
16. START (DECK B P) buttons
A+B REC button
HIGH/NORMAL, DUBBING AnB button
17. AUTO CAL (START P) buttons
DECKA button
DECK B button
18. PHONES jack
19. SYNCHRO button and indicator
20. ARL button
21. FADER button
22. REC LEVEL knob
23. AUTO indicator

– 5 –
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
CASE
Unscrew the five case attachment screws M3 ×8 and remove
the case.
2-1. FRONT PANEL ASSY
1 BVTP 3x8
2 lug plate
3 CNA807
1 BVTP 3x8
2 power voltage selector
4 CNS802
5 CNA801 (US, Canadian)
6 CNA803
7 CNA806
8 CN51
0 CN002
!¡ CNP73
!¢ claw
!§ CN501, 502
!™ BVTP 3x6
!∞ claw
!¶ CN503, 504
!£ BVTP 3x8
!• front panel assy
9 CN51
(WE725/WE825S)
5 BVTP 2.6x8
4 BVTP 2.6x8
6 mechanism deck
3 cassette lid
2 claws
2-2. MECHANISM DECK
1Press the EJECT button.
POWER VOLTAGE SELECTOR 1- 2(Singapore, Malaysia)
FRONT PANEL ASSY 1- !¶

– 6 –
2-3. FITTING BASE
2-4. CAPSTAN MOTOR, REEL MOTOR
4 PTPWH 2x23
3 connector
7 gear (trigger)
5 claws
6 fitting base
1 Pull the capstan belt
and put around claws.
2 Pull the square belt
and put around claws.
0 reel motor
5 claws
6 AUDIO board
2 connector
4 claw
3 connector
1 square belt
9 P 2.6x2.8
7 B 2.6x3
8 capstan motor
!¡ ground plate

– 7 –
2-5. HEAD DECK ASSY
5 torsion spring
3 claw
1 claw
6 claw
7 head deck assy
2 lever (pinch F) assy
4 lever (pinch R) assy

– 8 –
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback/erase head pinch roller
rubber belts capstan
idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustment.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
Forward CQ-102C 30 to 65 g • cm
(0.42 to 0.90 oz • inch)
DECK A : 1 to 6 g • cm
Forward (0.014 to 0.083 oz • inch)
back CQ-102C
tension DECK B : 2 to 9 g • cm
(0.028 to 0.125 oz • inch)
Reverse CQ-102RC 30 to 65 g • cm
(0.42 to 0.90 oz • inch)
Reverse 1 to 6 g • cm
back CQ-102RC (0.014 to 0.083 oz • inch)
tension
FF/REW CQ-201B 70 to 120 g • cm
(0.97 to 1.67 oz • inch)
SECTION 4
ELECTRICAL ADJUSTMENTS
SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to male playback adjustment at first.)
2. The adjustmentsandmeasurement should beperformedfor both
L-CH and R-CH.
• Switch position
DOLBY NR switch : OFF
DIRECTION MODE switch : A
• Standard record position :
Deliver the standard input signal level to input jack and set
the REC LEVEL control to obtain the standard output signal
level as follows.
– Record Mode–
0 dB = 0.775 V
Standard Input Level
Input terminal LINE IN
source impedance 10 kΩ
input signal level 0.5 V (–3.8 dB)
Standard Output Level
Output terminal LINE OUT
load impedance 47 kΩ
output signal level 0.5 V (–3.8 dB)
Test Tape
Tape Contents Use
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB PB Level Adjustment
set
–
+
AF OSC
attenuator 10 k
Ω
600 Ω
LINE IN
level meter
LINE OUT
47 k Ω
Test Mode
1. TurnON powerswitch pressing “RECMUTING” switch of deck
A and B at the same time.
At first, all the fluorescent indicator light up, then the system
returns to normal display. (However, “0. 00” is not displayed on
the counter.)
2. To release the test mode, turn OFF the power switch.

– 9 –
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Procedure:
1. Forward Playback Mode
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.
3. Playback Mode
4. Change the reverse playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location: –record/playback head–
–
+
set
test tape
P-4-A100
(10 kHz, –10 dB) level meter
LINE OUT
47 k Ω
within
1 dB within
1 dB
output
level
R-CH
peak
R-CH
peak
L-CH
peak
L-CH
peak
screw
position screw position
–
+– +
VH
Screen Pattern
set
In phase 45˚ 90˚ 135˚ 180˚
good wrong
47 k
Ω
47 k Ω
L-CH
R-CH
test tape
P-4-A100
(10 kHz, –10 dB)
LINE OUT
oscilloscope
forward side reverse side
adjustment screws
Tape Speed Adjustment DECK A DECK B
Procedure:
–Forward Playback Mode–
(High speed adjustment)
1. Set to test mode. (Refer to page 8.)
2. Set to FWD playback mode.
3. Twice pressing the HIGH/NORMAL switch.
4. Adjust RV72 so that the frequency counter reading becomes
6,000 ±20 Hz.
5. Release test mode after adjustment is completed.
(Normal speed adjustment)
1. Set to FWD playback mode.
2. Adjust RV71 so that the frequency counter reading becomes
3,000 ±10 Hz.
(Pitch control adjustment) (TC-WE725/WE825S only)
1. Push the PITCH CONTROL switch.
2. Set RV902 to mechanical center.
3. Set to FWD playback mode.
4. Adjust RV601 so that the frequency counter reading becomes
3,000 ±10 Hz.
Frequency difference between the beginning and the end of the tape
should be within ±3%.
Frequency difference between the deckA and deck B the beginning
of the tape should be within ±1.5%.
Adjustment Location: AUDIO board, MAIN board
(See page 11.)
Playback Level Adjustment DECK A DECK B
Procedure:
–Forward Playback Mode–
–
+
set
frequency counter
47 k
Ω
LINE OUT
test tape
WS-48B
(3 kHz, 0 dB)
Adjust RV11 (L-CH) and RV21 (R-CH) so the level meter reading
becomes the adjustment limits below.
Adjustment Value:
LINE OUT level : –7.7 ±0.5 dB (0.301 to 0.338 V)
Level difference between channels : within 0.5 dB
Confirmthatthe LINE OUTlevel does not changein playback mode
while changing the mode from playback to stop several times.
Adjustment Location: AUDIO board (See page 11.)
–
+
set
test tape
P-4-L300
(315 Hz, 0 dB) level meter
LINE OUT
47 k Ω

– 10 –
Bias Consumption Current Adjustment
DECK A DECK B
This adjustment should be performed when replacing the head assy
or the bias oscillator transformer (T81, T91).
Procedure:
1. Connect the digital voltmeter to test point TP81.
2. Set RV81 (L-CH), RV91 (R-CH) to mechanical center.
3. Set to FWD record mode.
4. Adjust T81 (L-CH), T91 (R-CH) so that the digital voltmeter
reading becomes minimum.
Adjustment Value: Maximum 220 mV
Adjustment Location: AUDIO board (See page 11.)
Record Bias Adjustment DECK A DECK B
Setting:
REC LEVEL control : standard record position (See page 8.)
Procedure:
1. Record Mode
set
123
–
+
blank tape
CS-413
TP81
L-CHR-CH
digital
voltmeter
LINE IN
no signal
2. Playback Mode
set
AF OSC
attenuator 10 k
Ω
600 Ω
LINE IN
1) 315 Hz
2) 10 kHz 38.8 mV (–26 dB)
blank tape
CS-123
Confirm that the 10 kHz playback output is 0 ±0.5 dB relative to
the 315 Hz output. If necessary, adjust RV81 (L-CH), RV91 (R-
CH) and repeat the steps given above.
Adjustment Location: AUDIO board (See page 11.)
–
+
set
recorded
portion level meter
LINE OUT
47 k Ω
Record Level Adjustment DECK A DECK B
Setting:
REC LEVEL control : standard record position (See page 8.)
Procedure:
1. Record Mode
2. Playback Mode
set
AF OSC
attenuator 10 k
Ω
600 Ω
LINE IN
blank tape
CS-123
315 Hz, 38.8 mV (–26 dB)
Confirm playback the tape recorded become adjustment level as
follows.
If necessary, adjust Deck A : RV102 (L-CH), RV202 (R-CH) and
Deck B : RV101 (L-CH), RV201 (R-CH) and repeat the steps 1 and
2.
Adjustment Value:
LINE OUT level : –26 ±0.5 dB (36.7 to 41.1 mV)
Adjustment Location: MAIN board (See page 11.)
–
+
set
recorded
portion level meter
LINE OUT
47 k Ω

– 11 –
Adjustment Location:
–audio board (component side)–
RV91
(R)
RECORD BIAS ADJ
RV81
(L)
RV72 (HIGH) TAPE SPEED ADJ
PLAYBACK
LEVEL
ADJ
RV71 (NORMAL)
RV21 (R)
RV11 (L)
T81 (L)
T91 (R)
BIAS
CONSUMPTION
CURRENT
ADJ
TP81
RV101
(L)
RECORD LEVEL ADJ
(DECK B)
RV201
(R)
RV202
(R)
RECORD LEVEL ADJ
(DECK A)
RV102
(L)
RV601
TAPE SPEED ADJ
(PITCH CONTROL)
–main board (component side)–

– 12 –
5-1. IC PIN DESCRIPTION
• IC801 CXP82432A-006Q (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Pin Description
1 T-REEL (A) I Take-up reel rotation detection input (DECK A)
2 S-REEL (B) I Supply reel rotation detection input (DECK B)
3 T-REEL (B) I Take-up reel rotation detection input (DECK B)
4 SIRCS IN I Sircs signal input
5 POWER IN I Power-off detection input
6 VOL OUT O Record level control output (PWM)
7 A/B SEL I Playback A/B selector input “L” : A, “H” : B
8 CONTROL-AIN I Control A signal input
9 CONTRL-A OUT O Control A signal output
10 REC MUTE (A) O Recording mute output (DECK A) “L” : Mute ON
11 REC CAL 0 (A) O Recording CAL-0 output for auto calibration. (DECK A)
12 REC CAL 1 (A) O Recording CAL-1 output for auto calibration. (DECKA)
13 GP CAL 0 (A) O GEQ CAL-0 output for auto calibration. (DECK A)
14 GP CAL 1 (A) O GEQ CAL-1 output for auto calibration. (DECK A)
15 REC/PB O Record/playback dolby NR mode selector output “L” : Playback
16 REC MUTE (B) O Recording mute output (DECK B) “L” : Mute ON
17 AMS IN I AMS signal input “L” : Music present
18 CAL/OFF/S O Audio selector “H” : CAL, “Open” : Dolby off, “L” : Dolby S
19 C/B/OFF O Dolby selector “H” : C, “Open” : B, “L” : Dolby off
20 REC CAL 0 (B) O Recording CAL-0 output for auto calibration. (DECK B)
21 REC CAL 1 (B) O Recording CAL-1 output for auto calibration. (DECK B)
22 GP CAL 0 (B) O GEQ CAL-0 output for auto calibration. (DECK B)
23 GP CAL 1 (B) O GEQ CAL-1 output for auto calibration. (DECK B)
24 POWER OUT O Power hold output
25 RECEQ HIGH/NORM O REC EQ high/normal select output “L” : Normal
26 PASS/MUTE/DOLBY O Audio selector “H” : Pass, “Open” : Mute, “L” : Dolby
27 BS/AMS/OFF O AMS amp selector “H” : BS, “Open” : AMS, “L” : OFF
28 EX IN 0 I Expander control input (0)
29 EX IN 1 I Expander control input (1)
30 EXP CTRL 0 O Expander control output (0)
31 EXP CTRL 1 O Expander control output (1)
32 A/D IN 0 I Expander A/D input (0)
33 A/D IN 1 I Expander A/D input (1)
34 KEY 5 I Key 5 input (A/D converter)
35 VOL IN I Record volume input (A/D converter)
36 TEST/PITCH/VER I Test mode/pitch control/version input
37 CD SYNC LED O CD SYNCHRO LED driver “L” : ON
38 RESET I System reset input
39 EXTAL I System clock oscillator input (10 MHz)
40 XTAL O System clock oscillator output (10 MHz)
41 VSS — Ground
42 TX — Connected to ground.
43 TEX — Connected to ground.
44 ARL LED O ARL LED driver “H” : ON
45 PITCH ON/OFF O Pitch control ON/OFF output “L” : ON
46 AVREF I Reference voltage input for A/D converter.
47 AVSS — Ground for A/D converter.
48 LINE MUTE O Line mute ON/OFF control output “L” : Mute ON
49 OSC H/L O OSC frequency H/L select output for auto calibration.
50 OSC ON/OFF O OSC ON/OFF select output for auto calibration.
51 BIAS CAL 0 (B) O EQ bias CAL-0 output for auto calibration. (DECK B)
SECTION 5
DIAGRAMS

– 13 –
Pin No. Pin Name I/O Pin Description
52 BIAS CAL 1 (B) O EQ bias CAL-1 output for auto calibration. (DECK B)
53 BIAS CAL 2 (B) O EQ bias CAL-2 output for auto calibration. (DECK B)
54 BIAS CAL 3 (B) O EQ bias CAL-3 output for auto calibration. (DECK B)
55 BIAS CAL 0 (A) O EQ bias CAL-0 output for auto calibration. (DECK A)
56 BIAS CAL 1 (A) O EQ bias CAL-1 output for auto calibration. (DECK A)
57 BIAS CAL 2 (A) O EQ bias CAL-2 output for auto calibration. (DECK A)
58 BIAS CAL 3 (A) O EQ bias CAL-3 output for auto calibration. (DECK A)
59 CAP.M (B) O Capstan motor driver output (DECK B) “H” : ON
60 CAP.M (A) O Capstan motor driver output (DECK A) “H” : ON
61 CAP.M H/L O Capstan motor high/normal select output “L” : ON
62 – 77 P16 – P1 O Fluorescent indicator tube segment driver
78 – 85 G1 – G8 O Fluorescent indicator tube grid driver
86 G6,G7 O Fluorescent indicator tube grid driver
87 G7,G8 O Fluorescent indicator tube grid driver
88 VFDP — Fluorescent indicator tube power supply (-28 V)
89 VDD — Power supply (+5 V)
90 N.C — Connected to power supply.
91 VSS — Ground
92 REEL (A) + O Reel motor (+) output (DECK A)
93 REEL (A) - O Reel motor (-) output (DECK A)
94 REEL (B) + O Reel motor (+) output (DECK B)
95 REEL (B) - O Reel motor (-) output (DECK B)
96 BIAS (A) O Bias ON/OFF output (DECK A) “H”:ON
97 RELAY (A) O Relay record/playback selector output (DECK A) “L” : Record
98 BIAS (B) O Bias ON/OFF output (DECK B) “H” : ON
99 RELAY (B) O Relay record/playback selector output (DECK B) “L” : Record
100 S-REEL (A) I Supply reel rotation detection input (DECKA)

5-2. CIRCUIT BOARDS LOCATION
– 14 –
•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.
• All resistors are in Ωand 1/4W 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 !or dotted
linewith mark !arecriti-
cal for safety.
Replace only with part
number specified.
Note:
Lescomposantsidentifiés par
une marque !sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
•For printed wiring boards.
•X: parts extracted from the component side.
•®: Through hole.
•b: Pattern from the side which enables seeing.
(The other layers’ patterns are not indicated.)
: Chip transistor of abbreviation (E, C, B)
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
no mark : PB (DECK A)
( ) : REC (DECK A)
< > : PB (DECK B)
[ ] : REC (DECK B)
<< >> : STOP
∗: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Signal path.
E: PB (DECK A)
a: REC (DECK A)
d: PB (DECK B)
G: REC (DECK B)
• Abbreviation
CND : Canadian model.
AUS : Australian model.
SP : Singapore model.
MY : Malaysia model.
CH : Chinese model.
AUDIO (B) board
LEAF SW (B) board
LEAF SW (A) board
FL board
HEADPHONE board
REC VOL board
MAIN board
TRANS (B) board
AUDIO (A) board
SW (C) board
SW (A) board
SW (B) board
TRANS (A) board
DOLBY-S board
(WE825S)
(Except Singapore, Malaysia)
(Except US, Canadian)
(Except US,
Canadian)
(US, Canadian)
BCE

5-3. PRINTED WIRING BOARDS — MAIN SECTION —
TC-WE625/WE725/WE825S
– 15 – – 16 –
(Page 35)
(Page 35)
(Page 33) (Page 33) (Page 28) (Page 15) (Page 27) (Page 31) (Page 31)
(Page 31)
(Page 28)(Page 31)
(Page 28)
(Page 25)

5-4. SCHEMATIC DIAGRAM — MAIN SECTION (1/4) — • Refer to page 37 for IC Block Diagrams.
TC-WE625/WE725/WE825S
– 17 – – 18 –
Ref. No. Location
D101 E-6
D201 E-6
D401 A-4
D521 B-1
D522 B-1
D601 H-6
D602 H-6
D701 A-9
D702 A-8
D703 B-8
D704 B-8
D705 A-8
D706 A-8
D707 B-8
D708 A-5
D709 A-5
D710 A-6
D711 B-6
D712 A-8
D713 A-8
D714 C-8
D715 B-7
D716 C-8
D801 F-8
D802 F-8
D803 F-8
D804 F-8
IC501 C-2
IC502 F-1
IC504 E-12
IC561 A-1
IC601 E-10
IC701 A-6
IC801 F-7
IC802 F-6
IC803 E-6
IC804 E-5
IC805 F-4
IC806 G-12
IC807 G-12
IC808 G-3
IC809 G-4
Q101 E-2
Q102 A-3
Q201 D-1
Q202 A-3
Q401 A-4
Q451 G-13
Q452 F-11
Q453 F-12
Q461 G-2
Q462 F-3
Q463 F-3
Q501 B-3
Q502 B-1
Q503 B-1
Q601 H-6
Q602 H-6
Q603 H-6
Q604 H-7
Q605 H-6
Q606 H-7
Q607 H-7
Q621 D-13
Q701 A-7
Q702 B-6
Q703 A-8
Q704 A-8
Q705 A-7
Q706 A-8
Q707 B-8
Q708 C-8
Q801 F-8
Q802 D-7
• Semiconductor
Location
(Page 32)
(Page
32)
(Page 31)
(Page 32)
(Page 19)
(Page 21)
(Page 23)

TC-WE625/WE725/WE825S
– 19 – – 20 –
5-5. SCHEMATIC DIAGRAM — MAIN SECTION (2/4) — • Refer to page 37 for IC Block Diagrams.
(Page
34)
(Page
34)
(Page 34)
(Page 18)
(Page 21)
(Page 23)

TC-WE625/WE725/WE825S
– 21 – – 22 –
5-6. SCHEMATIC DIAGRAM — MAIN SECTION (3/4) —
(Page
18)
(Page 29) (Page 30)
(Page 20) (Page 24)
(Page
26)
(Page 29)
(Page
29)

TC-WE625/WE725/WE825S
– 23 – – 24 –
5-7. SCHEMATIC DIAGRAM — MAIN SECTION (4/4) —
(Page
18)
(Page
20)
(Page 22)
(Page
35)
(Page
35)