Sony WE725, WE825S, TC-WE725, TC-WE825S Service Manual

– 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 a and “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 V AC, 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)
CONTROL A1 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 P ARTS WHOSE
P AR T NUMBERS APPEAR AS SHO WN IN THIS MANU AL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
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

F

1.5k

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 follow­ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for A C leakag e. 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 a V OM
or battery-operated A C v oltmeter. 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 pas­sive 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 –Deck A Section–......................... 31

5-13. Schematic Diagram –Deck A 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. EXPLODED VIEWS

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
3-021-228-0π TC-WE625 : US model
3-021-228-1π TC-WE625 : CND model
3-021-228-2π TC-WE625 : AUS model
3-021-228-3π TC-WE625 : SP, MY model
3-021-228-4π TC-WE625 : CH model
3-021-242-0π TC-WE725 : AEP model
3-021-242-1π TC-WE725 : UK model
3-021-243-0π TC-WE825S : AEP model
3-021-243-1π TC-WE825S : UK model
3-021-243-3π TC-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

7

98

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 (Ø ON/ø OFF) switch
(TC-WE725/WE825S)

4. PITCH CONTROL knob (TC-WE725/WE825S)

5. Cassette holder (Deck A)

6. COUNTER A buttons (Deck A)
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

p CLEAR (Stop) button

ª BACK (Reverse play) button

· FRONT (Foward play) button

P PAUSE button
R REC MUTING button
r REC 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

P PAUSE button
R REC MUTING button
r REC 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
DECK A 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

1 Press 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 adjustments and measurement should be performed for 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. Turn ON power switch pressing “REC MUTING” 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. (Ho we ver , “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 deck A 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 R V11 (L-CH) and RV21 (R-CH) so the level meter reading
becomes the adjustment limits below.

Adjustment V alue:

LINE OUT level : –7.7 ± 0.5 dB (0.301 to 0.338 V)

Level difference between channels : within 0.5 dB

Confirm that the LINE OUT level does not change in 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 V alue: 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 (R­CH) 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), R V201 (R-CH) and repeat the steps 1 and

2.

Adjustment V alue:

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-A IN 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. (DECK A)
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 (DECK A)