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.
US Model
TC-WE625/WE825S
Canadian Model
TC-WE625
AEP Model
UK Model
TC-WE725/WE825S
E Model
Australian Model
Chinese Model
TC-WE625
Model Name Using Similar
Mechanism
DECK A TC-WE725/WE825S :
Tape TransportTCM-190RB13C
Mechanism TypeTC-WE625 : TCM-190RB12CL
DECK B TC-WE725/WE825S :
TC-WE505/WE605S/WE705S
TC-WE625 :TCM-190RB12CL
TCM-190RB11C
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
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 I30-16,000 Hz (±3 dB, IEC),
(NORMAL)20-17,000 Hz (±6 dB)
Type II tape, Sony Type II30-17,000 Hz (±3 dB, IEC),
(HIGH)20-18,000 Hz (±6 dB)
Type IV tape, Sony Type IV30-19,000 Hz (±3 dB, IEC),
(METAL)20-20,000 Hz (±6 dB),
30-13,000 Hz (±3 dB, –4 dB
recording)
– Continued on next page –
MICROFILM
STEREO CASSETTE DECK
– 1 –
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
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 AC leakage. Check leakage as
described below.
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 purchasedPower requirements
US, Canadian120 V AC, 60 Hz
AEP, UK, Chinese220 - 230 V AC, 50/60 Hz
Australian240 V AC, 50/60 Hz
Singapore, Malaysia120/220/230 - 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.
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)
To Exposed Metal
Parts on Set
0.15
µ
F
1.5k
Ω
Earth Ground
AC
voltmeter
(0.75V)
Fig. A. Using an AC voltmeter to check AC leakage.
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 AR TS 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.
– 2 –
MODEL IDENTIFICATION
TABLE OF CONTENTS
–Back panel–
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
Part No.
1. GENERAL
1-1. Location of Controls ........................................................... 4
2. DISASSEMBLY
2-1. Front Panel Assy .................................................................5
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.
– 8 –
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Procedure:
1. Forward Playback Mode
test tape
P-4-A100
(10 kHz, –10 dB)
set
LINE OUT
47 k
level meter
Ω
+
–
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.
L-CH
peak
screw
position
R-CH
peak
output
level
1 dB
L-CH
peak
R-CH
peak
within
1 dB
screw position
within
3. Playback Mode
test tape
P-4-A100
(10 kHz, –10 dB)
In phase 45˚90˚135˚180˚
L-CH
set
R-CH
Screen Pattern
goodwrong
47 k
47 k
LINE OUT
Ω
Ω
oscilloscope
VH
+
–+–
T ape Speed Adjustment DECK A DECK B
Procedure:
–Forward Playback Mode–
test tape
WS-48B
(3 kHz, 0 dB)
set
LINE OUT
frequency counter
47 k
Ω
+
–
(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–
test tape
P-4-L300
(315 Hz, 0 dB)
set
47 k
level meter
Ω
+
–
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–
forward side
adjustment screws
reverse side
LINE OUT
Adjust R V11 (L-CH) and RV21 (R-CH) so the lev el meter r eading
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.)
– 9 –
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:
digital
voltmeter
+
–
TP81
LINE IN
no signal
blank tape
CS-413
set
L-CHR-CH
123
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.
Record Level Adjustment DECK A DECK B
Setting:
REC LEVEL control : standard record position (See page 8.)
Procedure:
1. Record Mode
AF OSC
attenuator
10 k
Ω
set
600
Ω
LINE IN
315 Hz, 38.8 mV (–26 dB)
blank tape
CS-123
2. Playback Mode
recorded
portion
47 k
level meter
Ω
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
AF OSC
attenuator
10 k
600
Ω
LINE IN
1) 315 Hz
2) 10 kHz
Ω
set
38.8 mV (–26 dB)
blank tape
CS-123
2. Playback Mode
recorded
portion
set
47 k
level meter
Ω
+
–
set
LINE OUT
+
–
Confirm playback the tape recorded become adjustment level as
follows.
If necessary, adjust Deck A : RV102 (L-CH), RV202 (R-CH) and
Deck B : R V101 (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.)
LINE OUT
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.)
– 10 –
Adjustment Location:
–audio board (component side)–
RECORD BIAS ADJ
CONSUMPTION
BIAS
CURRENT
ADJ
RV91
(R)
T81 (L)
T91 (R)
RV81
(L)
RV72 (HIGH)
RV71 (NORMAL)
TP81
TAPE SPEED ADJ
RV21 (R)
RV11 (L)
PLAYBACK
LEVEL
ADJ
–main board (component side)–
RECORD LEVEL ADJ
(DECK A)
(R)
RV102
(L)
RV601
TAPE SPEED ADJ
(PITCH CONTROL)
RV202
RECORD LEVEL ADJ
(DECK B)
RV201
RV101
(L)
(R)
– 11 –
SECTION 5
DIAGRAMS
5-1. IC PIN DESCRIPTION
• IC801 CXP82432A-006Q (SYSTEM CONTROLLER)
Pin No.Pin NameI/OPin Description
1T-REEL (A)ITake-up reel rotation detection input (DECK A)
2S-REEL (B)ISupply reel rotation detection input (DECK B)
3T-REEL (B)ITake-up reel rotation detection input (DECK B)
4SIRCS INISircs signal input
5POWER INIPower-off detection input
6VOL OUTORecord level control output (PWM)
7A/B SELIPlayback A/B selector input “L” : A, “H” : B
8CONTROL-A INIControl A signal input
9CONTRL-A OUTOControl A signal output
10REC MUTE (A)ORecording mute output (DECK A) “L” : Mute ON
11REC CAL 0 (A)ORecording CAL-0 output for auto calibration. (DECK A)
12REC CAL 1 (A)ORecording CAL-1 output for auto calibration. (DECK A)
13GP CAL 0 (A)OGEQ CAL-0 output for auto calibration. (DECK A)
14GP CAL 1 (A)OGEQ CAL-1 output for auto calibration. (DECK A)
15REC/PBORecord/playback dolby NR mode selector output “L” : Playback
16REC MUTE (B)ORecording mute output (DECK B) “L” : Mute ON
17AMS INIAMS signal input “L” : Music present
18CAL/OFF/SOAudio selector “H” : CAL, “Open” : Dolby off, “L” : Dolby S
19C/B/OFFODolby selector “H” : C, “Open” : B, “L” : Dolby off
20REC CAL 0 (B)ORecording CAL-0 output for auto calibration. (DECK B)
21REC CAL 1 (B)ORecording CAL-1 output for auto calibration. (DECK B)
22GP CAL 0 (B)OGEQ CAL-0 output for auto calibration. (DECK B)
23GP CAL 1 (B)OGEQ CAL-1 output for auto calibration. (DECK B)
24POWER OUTOPower hold output
25RECEQ HIGH/NORMOREC EQ high/normal select output “L” : Normal
26PASS/MUTE/DOLBYOAudio selector “H” : Pass, “Open” : Mute, “L” : Dolby
27BS/AMS/OFFOAMS amp selector “H” : BS, “Open” : AMS, “L” : OFF
28EX IN 0IExpander control input (0)
29EX IN 1IExpander control input (1)
30EXP CTRL 0OExpander control output (0)
31EXP CTRL 1OExpander control output (1)
32A/D IN 0IExpander A/D input (0)
33A/D IN 1IExpander A/D input (1)
34KEY 5IKey 5 input (A/D converter)
35VOL INIRecord volume input (A/D converter)
36TEST/PITCH/VERITest mode/pitch control/version input
37CD SYNC LEDOCD SYNCHRO LED driver “L” : ON
38RESETISystem reset input
39EXTALISystem clock oscillator input (10 MHz)
40XTALOSystem clock oscillator output (10 MHz)
41VSS—Ground
42TX—Connected to ground.
43TEX—Connected to ground.
44ARL LEDOARL LED driver “H” : ON
45PITCH ON/OFFOPitch control ON/OFF output “L” : ON
46AVREFIReference voltage input for A/D converter.
47AVSS—Ground for A/D converter.
48LINE MUTEOLine mute ON/OFF control output “L” : Mute ON
49OSC H/LOOSC frequency H/L select output for auto calibration.
50OSC ON/OFFOOSC ON/OFF select output for auto calibration.
51BIAS CAL 0 (B)OEQ bias CAL-0 output for auto calibration. (DECK B)
– 12 –
Pin No.Pin NameI/OPin Description
52BIAS CAL 1 (B)OEQ bias CAL-1 output for auto calibration. (DECK B)
53BIAS CAL 2 (B)OEQ bias CAL-2 output for auto calibration. (DECK B)
54BIAS CAL 3 (B)OEQ bias CAL-3 output for auto calibration. (DECK B)
55BIAS CAL 0 (A)OEQ bias CAL-0 output for auto calibration. (DECK A)
56BIAS CAL 1 (A)OEQ bias CAL-1 output for auto calibration. (DECK A)
57BIAS CAL 2 (A)OEQ bias CAL-2 output for auto calibration. (DECK A)
58BIAS CAL 3 (A)OEQ bias CAL-3 output for auto calibration. (DECK A)
59CAP.M (B)OCapstan motor driver output (DECK B) “H” : ON
60CAP.M (A)OCapstan motor driver output (DECK A) “H” : ON