Sony TCM-343 Service manual
TCM-343
SERVICE MANUAL
Ver 1.0 2000. 11
SPECIFICATIONS
E Model
Chinese Model
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MT-323-118
Recording system
2-track 1 channel monaural
Frequency range
250 - 6 300 Hz
Speaker
Approx. 3.6 cm (1 7 / 16 in.) dia.
Power output (at 10% harmonic
distortion)
250 mW
Output
Earphone jack (minijack) for 8 300Ω earphone
Power requirements
• 3 V DC batteries R6 (AA) × 2
• External DC 3 V power sources
Dimensions (w/h/d) (incl. projecting
parts and controls)
Approx. 112 × 36.6 × 90.3 mm
(4 1 ⁄2 × 1 1 ⁄2 × 3 5 ⁄8 in.)
Mass (not incl. batteries)
Approx. 180 g (6.4 oz.)
Design and specifications are subject
to change without notice.
CASSETTE-CORDER
TABLE OF CONTENTS
1. GENERAL ·········································································· 2
2. DISASSEMBLY
2-1. Lid Sub Assy, Cassette····················································3
2-2. Main Board, Mechanism Deck ······································· 3
2-3. Belt·················································································· 4
2-4. “Head, Magnetic”, Pinch Roller ····································· 4
3. MECHANICAL ADJUSTMENT ·································· 5
SECTION 1
GENERAL
This section is extracted
from instruction manual.
VOL
4. ELECTRICAL ADJUSTMENT ···································· 5
5. DIAGRAMS
6-1. IC Block Diagrams ························································· 6
6-2. Block Diagram ································································ 7
6-3. Schematic Diagram ························································· 9
6-4. Printed Wiring Board···················································· 11
6. EXPLODED VIEWS
6-1. Cabinet Section ····························································· 13
6-2. Mechanism Deck Section-1 (MT-323-118) ·················· 14
6-3. Mechanism Deck Section-2 (MT-323-118) ·················· 15
7. ELECTRICAL PARTS LIST ·······································16
x STOP
N PLAY
m REW/REVIEW
M FF/CUE
PAUSE .
EAR
Built-in mic
Micrófono incorporado
Microfone incorporado
BATT
z REC
x STOP
m REW/
REVIEW
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
PAUSE .
— 2 —
SECTION 2
e
r
DISASSEMBLY
• The equipment can be removed using the following procedure.
Lid Sub Assy, Cassette Main Board, Mechanism Deck BeltSet
“Head, Magnetic”, Pinch Rolle
Note : Follow the disassembly procedure in the numerical order given.
2-1. LID SUB ASSY, CASSETTE
5
lid sub assy, cassette
four claws
4
two cords(SP901)
6
spring, cassett
2
screw
(IB LOCK)
2-2. MAIN BOARD, MECHANISM DECK
7
three screws
(IB LOCK)
5
two cords
(MIC901)
4
cord
(HRP901)
3
cabinet (rear)
1
claw
three screws
(B1.7
8
mechanism deck
×
9)
3
two cords
(M901)
6
main board
2
screw
(M1.4)
— 3 —
1
screw
(1.7)
2-3. BELT
8
screw (M1.4)
6
head, magnetic
(HRP901)
3
pinch roller
2
4
screw (1.4)
5
screw (M1.4 × 3.8)
9
head, magnetic
(HE901)
1
lever (pinch roller)
7
spring (azimuth),
compression
1
belt (capstan)
2
2-4. “HEAD, MAGNETIC”, PINCH ROLLER
belt (fr)
INSTALLATION MAIN BOARD
On installation MAIN board, adjust to the S101 and
the REC lever.
(1.7)
screw
(M1.4)
screw
main board
S101 (REC)
— 4 —
REC lever
SECTION 3
+
–
test tape
WS-48A
(3 kHz, 0 dB)
set
EAR jack (J102)
32 Ω
frequency counter
r
MECHANICAL ADJUSTMENT
SECTION 4
ELECTRICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head pinch roller
capstan rubber belt
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (DC 3.0 V) unless otherwise noted.
Torque Measurement
Mode Torque Meter Meter Reading
more than 1.96 mN • m
FWD
CQ-102C
FWD
back tension
FF, REW CQ-201B
(more than 20 g • cm)
(more than 0.28 oz • inch)
0.05 – 0.29 mN • m
(0.5 – 3 g • cm)
(0.007 – 0.04 oz • inch)
more than 4.90 mN • m
(more than 50 g • cm)
(more than 0.69 oz • inch)
PRECAUTION
• Supplied voltage : 3.0 V
• Switch and control position
VOL control : mechanical mid
PAUSE switch : OFF
Test tape
Type
WS-48A
P-4-A063
REC/PB Head Azimuth Adjustment
Procedure :
1. Model : playback
test tape
P-4-A063
(6.3 kHz, -10 dB)
2. Turn the adjustment screw to obtain the maximum readig on
level meter.
Note : Several peaks may appear, but take the maximum.
Signal
3 kHz, 0 dB
6.3 kHz, - 10dB
set
Used for
tape speed adjustment
head azimuth adjustment
level mete
10 kΩ
+
–
EAR jack (J102)
Adjustment Location : main board (conductor side)
Adjustment Location :
adjustment screw
Tape Speed Adjustment
Procedure :
RV601
1. Playback WS-48A (tape center part) in the FWD state and adjust
RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value :
Digital frequency counter
2,970 to 3,030 Hz
2. Check that frequency counter reading is within 2% of reading
of step 1.
— 5 —
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