Sony TC-WR701ESL User manual

TC-WR/O1ES/WR735S
SERVICE MANUAL
This photo is TC-WR701ES.
US Model
TC-WR7O1ES
Canadian Model
AEP Model
Australian Model
TC-WR735S
MERE Cagserie
Model Name Using Similar Mechanism | TC-WR690/WR790
TCM-190RB11C
DECK B) TCM-190RB11C
Tape Transport Mechanism Type
SPECIFICATIONS
4-track 2-channel stereo
Fast winding time Approx. 90 sec. (with Sony C-60 cassette)
Bias AC bias
Signal-to-noise ratio (at peak level and weighted)
Recording system
Cassette
(Dolby NR off)
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: 10 dB at 100 Hz; 24 dB at 1 kHz
0.4% (with Type I, 160 nWb/m, 315 Hz,
3rd H.D.)
1.8% (with Type IV, 250 nWb/m, 315 Hz,
3rd H.D.)
Frequency response (Dolby NR off)
Harmonic distortion
30 - 19,000 Hz (+3 dB, IEC)
30 - 13,000 Hz {+3 dB (-4 dB) recording]
Type li cassette 30 - 18,000 Hz (+3 dB,IEC)
[Type leassette | He (49 6B.IEC)
30 - 16,000 Hz (+3 dB,IEC
Type IV : Sony METAL-S
Type Il : Sony UX-S
Typel : Sony HF-S
Wow and flutter + 0.13% W.Peak (IEC)
0.07% W.RMS (NAB)
+ 0.18% W.Peak (DIN)
Inputs .
Line inputs Sensitivity 0.16 V
(phono jacks)
Input impedance 47 k ohms
Outputs
Line outputs
(phono jacks)
Rated output level 0.5 V at a load impedance
of 47 k ohms
Load impedance Over 10 k ohms
Output level 1 mW at a load impedance
of 32 ohms
120 V AC, 60 Hz (US, Canadian model)
220—230 V AC, 50/60 Hz (AEP, German
model)
240 V AC, 50/60 Hz (Australian model)
33 W
Headphones
(stereo phone jack)
General
Power requirements
Power consumption
Dimensions
Approx.
430X135
X295
mm
(w/h/d)
(17
X5%/,X115/.
inches)
including
project-
ing
parts
and
controls
Mass Approx. 4.8 kg (10 Ibs 10 oz)
Supplied accessories
Audio connecting cords (2)
Design and specifications are subject to change without notice.
STEREO CASSETTE DECK
SONY.

For higher quality recording/playback
* The Dolby HX PRO* system which improves the linearity of the
tape’s high-range response during recording. —
- B, C and S type Dolby NR* systems which reduce tape noise.
« Automatic calibration on each deck which ensures optimum
recording conditions to bring out the best in every tape.
For your convenience
+ Automatic tape type detection during playback and recording.
* The Multi-AMS and Memory Play functions which provide easy
access to a desired selection.
« A relay function for long recording and playback.
« Auto play function which automatically starts playback after tape
rewinding to start.
¢ Synchronized dubbing at normal or high speed.
- Simultaneous Recording function for the simultaneous recording
of the same source to cassettes in both decks.
For easier operation
* Twin easy-to-read linear counters which show the elapsed
recording or playing time on each deck.
« An optional remote commander which allows the remote. control
of various operations.
* Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories Licensing
Corporation. HX Pro originated by Bang & Olufsen.
“DOLBY”, the double-D symbo! DO and “HX PRO” are trademarks
of Dolby Laboratories Licensing Corporation.
MODEL IDENTIFICATION
(Specification Label)
TC-WR701ES
TC-WR735S
SONY move 10. (2777
STEREO CASSETTE DECK
UMMM
US, Canadian model: AC 120V 60Hz 33W
AEP, German model: AC 220-—-230V~50/60Hz 33W
Australian model : AC 240V~50/60Hz
SAFETY CHECK-OUT (US Model)
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.
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 0.5mA (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 instru-
ments.
to
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 VOM or battery-operated AC volt-
meter. 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
AC
voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.

TABLE OF CONTENTS
Section Title Page
1
. GENERAL
T-t, Identify ime: the: Parts s:% eroeu iia uted ase tae eses aes
2:
2.
2.
2-
2.
2-
9.
3.
4.
5:
5.
5.
oO
5.
5-
5-
6.
6-
6-
6-
6-
7.
DISASSEMBLY
1. Cassette Lid Assy sevics Leva ccc nuh oases eceadeeeae os
2 Bronte r Anel Assy sista kein is hewiee eS ers ke te od
5, Mechanism Deck <s42 ose seas cd jeepers en
4. Capstan Motor, Reel Motor (1) .................006,
5. Capsten Motor, Reel Motor (2) ........-.0. cece eeee
6. Head, Pinch Roller ................5. sal Se ne
MECHANICAL ADJUSTMENTS..................-
ELECTRICAL ADJUSTMENTS .............-..-..
DIAGRAMS
I Circiit Beards LOcanon: 2:22 ssecvesieesSiiees Gas
2. Printed Wiring Boards—Main Section— ............
3. Schematic Diagram—Main Section— ..............
4. Schematic Diagram—Panel Section— ..............
5. Printed Wiring Boards—Panel Section—............
6. Semiconductor Lead Layouts .........-..-...00e0e
EXPLODED VIEWS
Ie Cabinet Section: io isa< bistebadrae ele ts Geese wes
2. Front Panel: Section: 42254404 Gee iver ss Gi5024 ois
3: Méchanisin Section (1). 4 i acasacdnwa'e owas eee
4. Mechanism Section (2) .........-. 22 eee eee eens
ELECTRICAL PARTS LIST ...............-..-.--
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A 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 PUB-
LISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

SECTION 1
GENERAL
This section is extracted a
instruction manual.
Front Panel
For details, refer to the page number(s)
indicated in parentheses.
{1] POWER switch
(2] Deck A
[3] & (eject) button (deck A)
(4] MPX (multiplex) FILTER ON/OFF switch
(36)
[5] COUNTER buttons (deck A) (30)
RESET button
MEMORY button
[6] AUTO CAL (calibration) buttons (DECK
A, DECK B) (48,50)
Display panel
[8] DOLBY NR (Dolby noise reduction)
switch (18,22,32,42,44)
[9] BALANCE control (32)
REC (recording) LEVEL control (32,36)
11] COUNTER buttons (deck B) (30)
RESET button
MEMORY button
* Remote control sensor
You can remotely control this cassette
deck with:
— A remote commander that came with
a Sony amplifier or receiver if it has
the li mark and cassette deck contro!
capability.
— Any optional Sony remote commander
with the fil mark and cassette deck
control capability.
Deck B
[13] Tape operation buttons
lM (stop) button
<4 (jeftward fast winding) (Multi-AMS**)
button
~@ (reverse play) button
> (forward play) button
bP (rightward fast winding) (Multi-
AMS"*) button
If PAUSE button.
O REC MUTE (record muting) button
(46)
@ REC (recording) button
(eject) button (deck B)
[15] SYNCHRO DUBBING buttons (52)
HIGH speed button
NORMAL speed button
A+B REC (simultaneous recording)
button (42)
HEADPHONES jack (stereo phone jack)
DIR (direction) MODE switch
(18,22,32,42,44,52)
** AMS is an abbreviation for Automatic
Music Sensor.

SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
2-1. CASSETTE LID ASSY
@ Push the EJECT button.
2-2. FRONT PANEL ASSY
@ Remove the connectors.

2-3. MECHANISM DECK
@ BVTT2.6x8
mechanism deck
2-4. CAPSTAN MOTOR, REEL MOTOR (1)
@ PTPWH2 X23
© When installing, pull the FR belt
and put arround claws.
O When installing, pull the capstan belt
and put arround claws.

2-5. CAPSTAN MOTOR, REEL MOTOR (2)
@ connector
@ connectors
@ B2.6x3
© MD HX board
@ reel motor
belt (FR)
@ claws
2-6. HEAD, PINCH ROLLER
@ torsion spring
@ lever (pinch lever FWD) assy
@ lever (pinch lever REV) assy

SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
Clean the following parts. with a denatured alcohol-
moistened swab:
record/playback/erase head pinch roller
rubber belts idlers
capstan
Demagnetize the record/playback head with a head
demagnetizer.
(Head demagnetizer do not approach for the erase head.)
Do not use a magnetized screwdriver for the adjustment.
After the adjustments, apply suitable locking compound
to the parts adjusted.
The adjustments should be perfomed with the rated
power supply voltage unless otherwise noted.
Torque Measurement
Torque Torque meter Meter reading
CQ-102C ' 30 to 65g¢cm
Forward
(0.42
to
0.90
oz*inch)
1 to 6g*cm
(0.014 to 0.08 oz*inch)
30 to 65g*cm
(0.42 to 0.90 oz*inch)
1 to 6g*cm
(0.014 to 0.08 oz*inch)
70 to 120g*cm
(0.98 to 1.67 oz*inch)
Forward
CQ-102C
back tension Q
CQ-102RC
Reverse
Reverse
CQ-102R
back tension Q c
Forward,
Reverse ae
SECTION 4
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication.
(Be sure to make playback adjustment at first.)
2. The adjustment and measurement should be performed
for both L-CH and R-CH.
@ Switch position
DOLBY NR switch : OFF
DIR MODE switch :2
e@ 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—
AF OSC
Standard Input Level
Input terminal LINE IN
10kQ
0.25V (—10dB)
source impedance
input signal level
Standard Output Level
Output terminal
LINE OUT
47kO, load impedance
output signal level 0.44V (—5dB)
Test Tape
[Tope | Gontents—«CSOCtCite id
P-4-A100 10kHz, —10dB Azimuth Adjustment
P-4-L300 315Hz, 0dB Level Adjustment
WS-48B 3kHz, 0dB
Tape Speed Adjustment

Record/Playback Head Azimuth Adjustment
Procedure :
1. Reverse Playback Mode
test tape
P-4-A100
(10kHz, —10dB)
LINE OUT
2. Turn the adjustment screw for the maximum output
levels. If these levels do notmatch, turn the adjustment
screw until both of output levels match together within
within 1dB
R-CH
screw peas
position
L-CH RCH. == “Screw.
peak peak angle
3. Playback Mode
test tape
P-4-A100
(10kHz, —10dB) 47kQ oscilloscope
135° 180°
Nerve”
good wrong
a
4. Change the forward playback mode and repeat the steps
Oia
5. After the adjustment, lock the adjustment screws with
suitable locking compound.
Adjustment Location : —record/playback head—
|
)_° _@|
forward side reverse side
adjustment screws
Tape Speed Adjustment
Perform high speed adjustment before normal speed adjust-
ment.
Procedure :
—Forward Playback Mode—
test tape
WS-48B
(3kHz,
OdB)
frequency
counter
LINE OUT
(high speed adjustment)
1. Short the connector TP1 (pins @ and @). (test mode)
2. Keep on pressing the SYNCHRO DUBBING HIGH swit-
ch.
3. Adjust each RV72 so that the frequency counter reading
becomes within adjustment limits of 6,000+20Hz on both
of deck A and deck B.
4. Change the reverse playback mode and repeat the steps
2 and 3.
(normal speed adjustment)
5. After adjustment, open the connector TP1.
6. Keep on pressing the SYNCHRO DUBBING NORM
switch.
7. Adjust each RV71 so that the frequency counter reading
becomes within adjustment limits of 3,000+10Hz on both
of deck A and deck B.
8. Change the reverse playback mode and repeat the steps
6 and 7.
Frequency difference between the beginning and the end of
the tape should be within 3%.
Frequency difference between deck A and deck B the begin-
ning of the tape should be within 1.5%.
Adjustment Location: MD HX board

Playback Level Adjustment
Procedure :
—Forward Playback Mode—
test tape
P-4-L300
VTV
(315kHz, OdB) .
LINE OUT
Adjust each RV11 (L-CH) and RV21 (R-CH) so that the
VTVM reading becomes within adjustment limits below on
both of deck A and deck B.
Adjustment Limits :
LINE OUT level: —7.7+0.5dB (0.301 to 0.338V)
Level difference between channels: within 0.5dB
Confirm the LINE OUT level does not change in playback
mode while changing the mode from playback to stop several
times.
Adjustment Location : MD HX board
Bias Consumption Current Adjustment
This adjustment should be performed when replacing the
head assy or the bias oscillating transformer (T81, T91).
Procedure : digital
blank
tape
voltmeter
LINE IN CS-413
no signal
set ea
1. Connect the digital voltmeter to test point TP81.
2. Set RV81 (L-CH) and RV91 (R-CH) to mechanical center.
3. Set to forward record mode.
4. Adjust T81 (L-CH) and T91 (R-CH) so that the digital
voltmeter reading becomes minimum.
Adjustment Location : MD HX board
Record Bias Adjustment
Setting :
REC LEVEL control: standard record position (Refer to
page 8.)
Procedure:
1. Record Mode
AF OSC
blank tape
€) iene CS-123
Lary |
Eaic)
LINE IN
1) 315Hz _
5 ete 38.8mV (—26.0dB)
2. Playback Mode
recorded VTVM
portion
LINE OUT
3. Playback the signal recorded in step 1, and confirm that
the 10kHz playback output level is VITVM reading
becomes within adjustment limits below relative to the
315Hz output.
4. If the adjustment limits are not satisfied, adjust each
RV81 (L-CH) and RV91 (R-CH) so that the VT VM read-
ing becomes within adjustment limits below.
Adjustment Limits:
10kHz playback output
relative to the 315Hz output: 0+0.5dB
(0.732 to 0.821V)
Adjustment Location : MD HX board