Sony TC-D3 User manual

TC-D3/WM-D3
SERVICE MANUAL
Refer to MDR-W20L/B Service Manual issued previ-
ously for information of headphones supplied with
this set.
TC-D3:
FRANCE Model
UK Model
WM-D3:
US Model
Canadian Model
TARE
ae ee dl A E. P M ode!
ROLAy NA
SPECIFICATIONS
Recording system
Wow and flutter
4-track, 2-channel stereo
+0.13% (DIN)
0.08% WRMS (NAB)
Fast winding time Approx. 2min. with Sony Cassette HF-60
Frequency response (DOLBY NR OFF)
60-—15,000 Hz +3dB with TYPE | (Sony HF-S)
or TYPE I! (Sony UCX-S) cassette
40-16,000 Hz with TYPE | (Sony HF-S) or
TYPE lt! (Sony UCX-S) cassette
S/N (NAB, at peak level)
Total harmonic distorsion
1.0% with Sony UCX-S cassette
Line input/microphone (stereo minijack) x 1
(the same jack)
microphone sensitivity 0.83 mV (-68 dB),
plug in power type, for low impedance
microphone
Line input sensitivity 77.5mV
(47kilohms)
Line output jack (stereo minijack) <1
output level 0.25V (less than 4.7 kilohms)
headphones (stereo minijack) x1
load impedance 8-300 ohms
20 MW +20 mW (at 10% harmonic distortion,
load impedance 32 ohms)
Input
Output
Power output (DC)
Battery life (hours)
Receralng Tape playback
Batteries
TYPE
|
TYPE
Il
(power
output
(Normal) (Cro,) 0.5 mW + 0.5 mW)
Sony SUM-3 (NS)
New
Super
batteries
Approx.
2.5
|
Approx.
2
Approx.
3.5
Sony Eveready AM3
alkaline
batteries
Approx.
5
|
Approx.
4
Approx.
7
“ t2, ET Model
@ Photo: WM-D3
Tape
Transport
Mechanism
Type
MT-WM-D3-24
|
Power requirements
Dimensions
Weight
Supplied accessories
3V dc
Two IEC designation R6 batteries (size AA)
DC IN 3V jack can be used with the
following:
Sony AC-D2 ac power adaptor (optional)
for use on 120V ac, 60 Hz (available in
US, Canadian model)
for use on 240V ac, 50 Hz (available in
UK, model)
for use on 220V ac, 50 Hz (available in
AEP, FRANCE model)
for use on 100V ac, 120V ac or 220V ac,
50/60 Hz* (available in ET model)
* There are three types: one is for 100V
ac, one is for 120V ac and one is for
220V ac,
Sony DCC-70 car battery cord (optional)
for use with 12 V car battery
Approx. 124.2 x34.4 82.3 mm (w/h/d)
(5x134x3*4,inches)
not incl. projecting parts and controls
Approx. 125.4 37.3 x82.3mm (w/hid)
(6x1'/,x3%,igches)
incl. projecting parts and controls
Approx. 370g (13.1 02)
incl. batteries, not incl. other accessories
Stereo headphones (open-air type) (1)
Electret condenser stereo microphone (1)
Plug adaptor (1)
Connecting cord (1)
Carrying case and carrying strap (1 set)
‘Dolby’ and the double-D symbol are the trade. marks of
Dolby Laboratories Licensing Corporation. Noise reduction
system manufactured under license from Dolby Laboratories
Lice
nsing Corporation.
STEREO CASSETTE-CORDER
SONTY.

TC-D3/WM-D3
FEATURES
@ Dolby* B-type system reduces tape hiss noise.
@ Disc drive capstan servo system assures stable tape
transport, reducing wow and flutter.
@ Tape selector offers two positions.
@® 5-LED peak/battery indicator shows both the peak level and
the battery strength.
@ Plug-in power type microphone jack can supply power to
the supplied microphone.
@ Amorphous head for recording/playback spovides a wider
dynamic range.
@ Stereo minijacks can easily be connected to audio
components.
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SERVICING NOTES
® Flexible Circuit Board Repairing
1. Keep the temperature of the soldering iron at
270° + 10°C during repairing.
You can maintain the temperature of the
soldering iron around 270°C by using the ther-
mal controller.
2. Do not touch the soldering iron more than 4
seconds or 3 times on the same conductor of
the circuit board.
3. Do not apply force on the conductor when
soldering or unsoldering.
Tip of soldering iron
good wrong
/ nN
Ss fk (CaS

@ Replacing chip components
All chip components should be connected and disconnect-
ed, using a tapered soldering iron [temperature of the iron
tip: less than 280°C (536 F)], a pair of tweezers and braid-
ed wire.
Precautions for replacement -
1. Do not disconnect the chip component forcefully.
Otherwise, the pattern may peel off.
2. Never re-use a disconnected chip component. Dispose of
all old chip components.
3. To protect the chip component, heating time for attach-
ing the component should be within 3 seconds.
© Removing chip components
(1) Removing solder at electrode
Remove the solder at the electrode, using a thin
braided wire. Do not remove the solder of the part
(chip component) attached adjacent to the electrode.
Land
Pattern Soldering iron
(2) Disconnecting chip components
Turn the tweezers with the soldering iron alternately
applied to both electrodes, and the chip component
will be disconnected. Take careful precautions while
disconnecting, because if the chip component is force-
fully removed the land may peel off.
Never re-use a disconnected chip component.
Turn
Tweezers i
(3)
TC-D3/WM-D3
Smoothing the soldered surface
After disconnecting the chip component, remove the
solder by using a braided wire to smooth the land
surface.
© Connecting chip components
The value of chip components is not displayed on the
main body. Take due precautions to avoid mixing new
chip components with other ones.
(1)
(2)
Applying solder to land on one side
Apply a thin layer of solder to the land on one side
where the chip component is to be connected. Too
much solder may cause bridging.
Small quantity of solder.
Speedy soldering
Hold the chip component at the desired position,
using tweezers, and apply the soldering iron in the
arrow-marked direction. To protect the chip compo-
nent, heating time should be within 3 seconds.
Soldering iron oN
Land Printed circuit board
(3) Speedy soldering of electrode on the other side
Solder the electrode on the other side in the same
way as in (2) above.

TC-D3/WM-D3
PARTS IDENTIFICATION
[1] <4 FF (fast forward) button Cassette holder
[2] <@ PLAY (playback) button DC IN 3V (external power input) jack
[3] mg STOP button connect the ac power adaptor or car battery cord.
[4] PAUSE knob OPEN catch
Slide it in the direction of the arrow, and the tape stops Battery compartment
momentarily. To restart, slide it back to the original
position.
[5] @ REC (record) button
[6] me REW (rewind) button
Peak level/battery meter and indication selector
PEAK LEVEL: shows the recording level.
BATT: shows the battery condition
OFF: no indication
Tape counter and reset button
Use the counter to index the tape contents. Push the
reset button to set the counter to 000.
[9] DOLBY NR selector
TAPE selector
NORM: TYPE | (normal) tape
CrO,/METAL (PB) (playback): When playing back and
recording with TYPE li (CrO,) tape, or when playing back
with TYPE IV (metal) tape.
(14] LINE OUT (PB ONLY) (playback only) jack
PHONES (headphones) jack
{13} LINE IN/MIC (line input/microphone) jack and selector
REC LEVEL (recording level) control
(15] PHONE VOL (headphones volume) control

TC-D3/WM-D3
SECTION 1
BLOCK DIAGRAM
TC-D3/WM-D3
a+
(2.25V)
$303
$302-1 $302-2 DOLBY NR
me MIC OFF RVIOZ
{ | (REC LEVEL ADJ)
MIC AMP DOLBYAMP ON REC EQ AMP Cote dene seen
J301
ys
QI01
1€302(1/2)
2.95V
gh “) pecsit
1€305(1/2) 9105
RV30I~I
ef)
0305
[0
_]
/f
REC
LEVEL
REC
EQ
AMP
0304
R-CH MUTING eae
R-CH
0303
[=i0]
(2.98V)
0205 CH
A) $305
PEAK
LED ORIVE
rapes LED DRIVE 4
Lloz
Q316
1C306
ork
-_ att 4
|
BATT
ie igo /f 0308
|
(¥)
VOLTAGE
SHIFT
O
O
0302
F
PB
EQ
AMP
cio
MR
LINE
AMP
8
vee
HRPSOI-|
“_.
oe
=
UINE
OUT
REC/
PB
HEAD
O
1¢30
1C304
7
(PB
ONLY)
LINE
AMP
R-CH
MUTING
de Q104 =
361
on RIPPLE FILTER aa
nya (3V) OUT PUT (2.25)
PR LEVEL ADJ) 302 :
R-CH
O O © O O
$ ae d RV302-
cla7 clee PB EO SWITCH (12)
a oe ane
103 HE ADPHONE O 3303
()
AMP
©
PHONES
R-CH (C303
R-CH
HEADPHONE AMP FWD / PAUSE PROTECTOR
MUTING MUTING penn
9303 9304
ania B+ SWITCHING
OUT PUT B+ 0319 Bt
Q305 (3V)
T301
BIAS OSC
1
. |
HE9O!
+—O
2
MUTING
FWD
SWITCH
|FWO/REW
SWITCH
B+
ERASE HEAD. X P = 0306 , 307 0317 93/8 Le
PROTECTOR
Q3ll 9321
BIAS OSC
REC/PB
MUTING
Q308
BIAS TIMING :
SWITCHING |
a
314,323
ao
Bt
, : +8 oy PLAY
R~CH
(8.2V)
Q3l2 REC
BIAS SWITCHING
ay)
CN30
LOC IN 3V |
DRY BATTERY
MOTOR DRIVE Si7E "AA"
|
@ R-CH SAME AS L-CH
(IEC DESIGNATION R6)
2PCS, 3V
Q315
STOP MUTING
$902
V (FF/REW)
Le 960
a
(3)
SERVO AMP (9)
IC601
FG901
(1) @)
(4)—65)
(TAPE SPEED ADJ)

TC-D3/WM-D3 TC-D3/WM-D3
SECTION 2
DISASSEMBLY
© Follow the disassembly procedure in order given.
COMTREL
PANEL
REMOVAL
CASSETTE
PANEL
REMOVAL
special head screw When installing control panel,
be careful not to get out of
M1.4x 2.5
switch position.
cassette panel
7) special head screw
M1.4x25
special head screw
M1.4x4
@ OPEN knob Reinstallation
oe special head screw
M1.4x 2.5
special head screw
M1.4x 4
REC BOARD REMOVAL
MAIN BOARD REMOVAL SIDE PANEL
precision screw
precision screw
P1L4AX 3.5
PIL4AX 3.5
B1.7x 2
When installing side panel,
be careful not to get out
of switch position.
When installing main main board
board, be careful not
to get out of switch
position.
(2) Open the cassette panel. "4 .
wy
@ side panel

TC-D3/WM-D3
MECHANISM DECK REMOVAL
P1.4x 1.6 precision screw
PIL4AX 5
precision screw
P1.4x4 mechanism deck
REC/PB HEAD (HRP901), ERASE HEAD (HE901), PINCH ROLLER REMOVAL
compression spring steel ball 1.2mm
precision screw
holder’ P2x 3
spring
compression spring precision screw ‘3
P2x 3.5 |
Spring
a ;
2 a
steel
ball
1.2mm
“are
tly
&
pinch
roller
tension spring
' Spring
HRP9O1 |
erase head board ~
seam (t=0. 2)
a (t=0. 1) Oe F 7,2
son
‘ spring
erase head retainer , Pp haad Ghassis
lead clamp \. screw
P2x 8
P1.4x 1.6
HE901
—9—

TC-D3/WM-D3
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS AND
MEASUREMENT
PRECAUTION
. Clean the following parts with a danatured-
alcohol-moistened swab:
record/play back head pinch roller
erase head rubber belts
capstan
. Demagnetize the record/playback head with a
head demagnetizer. (Do not bring the head de-
magnetizer close to the erase head.)
. Do not use a magnetized screwdriver for the
adjustments.
. After the adjustments, apply suitable locking
compound to the parts adjusted.
. The adjustments should be performed with the
rated power supply voltage unless otherwise
noted.
Perform with 2.5 V DC power
Torque Measurement
Torque Meter Reading Torque Meter
22 — 46 g-cm CO-102C
Forward
(0.30
—
0.63
oz-inch)
Fast Forward More than 65 g-cm
and Rewind (More than 0.89 oz-inch) eOe0re
; 1—3g-cm
Each Temson|| (O.014. 10.04 orinehye |)
Tape Tension Measuremerit
Meter Reading
CQ-403A 100 — 150 g (3,53 — 5.29 oz)
Pinch Roller Pressure Measurement
Procedure:
— playback mode --
1. Pull the spring scale in the direction of the arrow.
2. Slowly return the pinch roller and read the spring
scale just when the pinch roller starts to rotate.
Specifications:
150 + 20g
Head Height Adjustment
Procedure:
1. Prepare an adjustment cassette as shown below.
Cut out hatched
tape cassette portions.
2. In record mode and viewing from the front,
adjust the head heights to eliminate tape curl
and tape twist at arrowed portions.
erase head record/playback
head
3-578-138-0171 (t=0.1)
3-578-138-1171 (t=0.2)
Shim, head height adjustment
3. If necessary, adjust the height of the erase head
by turning the adjustment screw.
adjustment screw
4. Apply locking compound on adjustment screw.

3-2. ELECTRICAL ADJUSTMENTS
Note: The adjustment should be performed in the order
given in this service manual. The adjustments
should be performed for both L-CH and R-CH.
@Set the TAPE switches according to the tape as
follows.
CS-121 NORMAL
@® Switches and controls should be set as follows
unless otherwise specified.
DOLBY NR .......... Meare Bite ee OFF
@ Standard Record:
Deliver the standard input signal level to the
input jack and set the REC LEVEL control to
obtain the standard output signal level.
— Record Mode —
AF osc
aK) 10kQ
O attenuater
o—-O O
olt,000 4
——_ 6002
315Hz
Standard Input Level
source i _
0.25,V (—10dB) 0.775mV (—60dB)
Standard Output Level
output level 0.44V (—SdB)
TC-D3/WM-D3
Playback Head Azimuth Adjustment
Procedure:
1. Mode: playback
test tape
P-4-A100
(100kHz, —10 dB)
LINE OUT
Turn the adjustment screw for the maximum
output levels. If these levels do not match, turn
the adjustment screw where both of output
levels match together within 0.5 dB.
R-CH
Screw peak
position
3. Phase Check
Mode: playback
test tape
P-4-A063
oscilloscope
(6.3 kHz, —10 dB)
LINE OUT 47kQ.
R-CH
Screen pattern
DOOD
135° =180°
eas teeeepee A
in phase 45°
good wrong
Adjustment Location:
a
>
(9)
adjustment screw

TC-D3/WM-D3
Tape Speed Adjustment
Setting:
VOLUME knob: center click
Procedure:
Mode: playback
speed checker or
digital frequency
test tape counter
WS-48B
(3kHz, OdB)
LINE OUT
Specifications:
Speed checker Digital frequency counter
+2% 2,940 — 3,060 Hz
Adjustment Location:
——
Playback Level Adjustment
Setting:
TAPE select switch : NORM
DOLBY NR switch : OFF
Procedure:
Mode: playback
test tape
P-4-L.300
(315Hz, OdB)
LINE OUT
Adjust RV101 (L-CH) and RV201 (R-CH) for
245 — 256 mV (—10 to —9.6 dB) reading on VT VM.
Adjustment Location: main board
RV201
(R-CH)