Sony TCM-459-V Service manual
TCM-36/459V
SERVICE MANUAL
Ver 1.2 2004.03
Photo: TCM-459V
SPECIFICATIONS
US Model
Canadian Model
AEP Model
E Model
Chinese Model
TCM-459V
Tourist Model
TCM-36/459V
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MT-459V-118
9-923-317-12 Sony Corporation
2004C05-1 Personal Audio Company
© 2004.03 Published by Sony Engineering Corporation
CASSETTE-CORDER
TABLE OF CONTENTS
1. GENERAL ................................................................... 2
2. DISASSEMBLY ......................................................... 3
3. MECHANICAL ADJUSTMENTS....................... 5
Flexible Circuit Board Repairing
• Keep the temperature of the 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.
4. ELECTRICAL ADJUSTMENTS......................... 6
5. DIAGRAMS
5-1. Block Diagram ................................................................ 7
5-2. Printed Wiring Boards..................................................... 9
5-3. Schematic Diagram ......................................................... 13
6. EXPLODED VIEWS ................................................ 16
7. ELECTRICAL PARTS LIST ............................... 19
SECTION 1
GENERAL
• Parts Identification
VOL
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.
EAR
MIC
TAPE COUNTER
r REC
p STOP
( PLAY
SPEED CONTROL
0 REW/REVIEW
) FF/CUE
PAUSE c
Flat mic
VOR (TCM-459V)
MIC SENS (TCM-459V)
BATT/REC
DC IN 3V
– 2 –
• This set can be disassembled in the order shown below.
SECTION 2
DISASSEMBLY
SET
Note: Follow the disassembly procedure in the numerical order given.
CABINET (REAR)
CASSETTE LID
CABINET (REAR), CASSETTE LID
8
cassette lid
7
boss
3
claw
MAIN BOARD
MECHANISM DECK
(MT-459V-118)
6
flexible board
(CN102)
7
boss
BELT
9
cassette spring
2
screw
3
two claws
5
strap
1
three screws
(B1.7 × 10)
4
cabinet (rear)
– 3 –
MAIN BOARD, MECHANISM DECK (MT-459V-118)
Note: On installation MAIN
board adjust the S105
and knob (pause).
6
three screws
(IB lock)
knob (pause)
S105
7
claw
8
mechanism deck
(MT-459V-118)
1
Remove two solders
of motor leads (M901).
NOTE FOR INSTALLATION
• MAIN BOARD
On installation MAIN board
adjust the S101 and REC lever.
5
MAIN board
2
Remove the two solders
of the head lead (HRP901).
screw
(1.7)
4
screw
(M1.4)
screw
(M1.4)
S101
3
screw
(1.7)
– 4 –
REC lever
1
capstan belt
2
FR belt
3
counter belt
SECTION 3
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
10 k
Ω
set
EAR jack
+
–
adjustment screw
MECHANICAL ADJUSTMENTS
SECTION 4
ELECTRICAL ADJUSTMENTS
BELT
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head pinch roller
erase head rubber belt
capstan idler
2. Demagnetize the record/playback head with a head demagnetizer. (Do not bring the head demagnetizer close to the erase
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (2.5 V) unless otherwise noted.
Torque Measurement
Mode Torque Meter Meter Reading
FWD
Forward Back 1.0 – 4.5 g•cm
Tension (0.014 – 0.063 oz•inch)
FF, REW CQ-201B
CQ-102C
22 – 48 g•cm
(0.31 – 0.67 oz•inch)
more than 50 g•cm
(more than 0.69 oz•inch)
Tape T ension Measurement
Mode Tension Meter Meter Reading
FWD CQ-403C
more than 50 g
(more than 1.76 oz)
Precaution
• Supplied voltage: 2.5 V
• Switch and control position
VOR switch (S401): OFF (459V)
PAUSE switch (S105): OFF
VOL (RV101): mechanical mid
SPEED CONTROL (RV602): mechanical center
MIC SENS switch (S201): H (459V)
Test T ape
Type Signal Used for
P-4-A063 6.3 kHz, –10 dB head azimuth adjustment
WS-48A 3 kHz, 0 dB tape speed adjustment
0 dB=0.775 V
Record/Playback Head Azimuth Adjustment
Procedure:
Mode: playback
1. Turn the adjustment screw to obtain the maximum reading on
level meter.
Note: Several peaks may appear, but take the maximum.
2. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location:
Tape Speed Adjustment
Procedure:
Mode: playback
Standard tape for adjusting
WS-48A
(3 kHz, 0 dB)
10 k
set
EAR jack
frequency
counter
Ω
+
–
1. Play back WS-48A (tape end part) and adjust RV601 so that
the frequency counter reading becomes 3,000 ± 15 Hz.
2. Play back WS-48A tape the beginning and the end part, check
that the frequency counter reading is within same standard of
step1.
Adjustment Location:
[MAIN BOARD] (Side B)
IC101
RV601
IC501
RV602
S102
– 5 – – 6 –
Ver 1.2
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