Sony TCM-323 - Micro Portable Recorder User manual

SERVICE MANUAL
CASSETTE-CORDER
US Model
Canadian Model
AEP Model
E Model
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MT-323-118
SPECIFICATIONS
TCM-323
Ver 1.2 2004.03
9-923-304-12 Sony Corporation
2004C05-1 Personal Audio Company
© 2004.03 Published by Sony Engineering Corporation

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In this set, the S102 (power) detects REC/PLAYBACK on.
It is mounted on the MAIN board, and therefore the REC/PLAY-
BACK on cannot be detected with the MAIN board removed.
When making an operation check and voltage check of mechani-
cal deck with the MAIN board removed, fix the S102 at turn on.
SECTION 1
SERVICING NOTES
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
[MAIN BOARD] (Conductor Side)
IC101
IC102
IC601
TABLE OF CONTENTS
1. SERVICING NOTES............................................... 2
2. GENERAL .................................................................. 3
3. DISASSEMBLY ......................................................... 4
4. MECHANICAL ADJUSTMENTS....................... 7
5. ELECTRICAL ADJUSTMENTS......................... 8
6. DIAGRAMS
6-1. Block Diagram ................................................................ 9
6-2. Schematic Diagram ......................................................... 11
6-3. Printed Wiring Board ...................................................... 13
7. EXPLODED VIEWS................................................ 14
8. ELECTRICAL PARTS LIST ............................... 17

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SECTION 2
GENERAL This section is extracted from
instruction manual.

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CABINET (REAR), CASSETTE LID
Note: Follow the disassembly procedure in the numerical order given.
SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
9 cassette lid
8 cassette spring
5 strap
3 claw
3 four claws
2 screw
(IB lock)
4 cabinet (rear)
1 three screws
(B1.7
× 9)
7 boss
7 boss
6 Remove the two solders
speaker cords.
SET CABINET (REAR), CASSETTE LID MAIN BOARD, MECHANISM DECK (MT-323-118)
BELT

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MAIN BOARD, MECHANISM DECK (MT-323-118)
BELT
6 claw
2 screw
(1.7)
3 screw
(M1.4)
4 MAIN board
7 mechanism deck
(MT-323-118)
5 three screws
(IB lock)
1 Remove the two solders
electret condenser microphone
(MIC901).
1 Remove the two solders
magnetic head (HRP901).
1 Remove the two solders
motor (M901).
1 belt (capstan)
2 belt (FR)

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INSTALLATION MAIN BOARD
On installation MAIN board, adjust to the S101 and
the S102.
screw
(1.7) screw
(M1.4)
MAIN boar
d
S101 (REC/PB)
S102
(POWER)
lever (REC)

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SECTION 4
MECHANICAL ADJUSTMENTS
Tape Tension Measurement
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head pinch roller
erase head rubber belt
capstan idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (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 (2.5V) unless otherwise noted.
Torque Measurement
Mode Torque Meter Meter Reading
FWD more than 20 g•cm
CQ-102C (more than 0.28 oz•inch)
Forward Back Tension 0.5 - 3 g•cm
(0.007 - 0.04 oz•inch)
FF CQ-201B more than 50 g•cm
REW (more than 0.69 oz•inch)
Mode Tension Meter Meter Reading
FWD CQ-403C more than 50 g
(more than 1.76 oz)

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SECTION 5
ELECTRICAL ADJUSTMENTS
Precaution
• Supplied voltage: 2.5 V
• Switch and control position
PAUSE switch (S105): OFF
VOL (RV101): mechanical mid
TestTape
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:
0 dB=0.775 V
Tape Speed Adjustment
Procedure:
Mode: playback
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] (Conductor Side)
level mete
r
test tape
P-4-A063
(6.3 kHz, –10 dB) 10 k
Ω
set
EAR jack
+
–
frequency
counter
Standard tape for adjusting
WS-48A
(3 kHz, 0 dB) 10 k
Ω
EAR jack
set
+
–
Type Signal Used for
P-4-A063 6.3 kHz, –10 dB head azimuth adjustment
WS-48A 3 kHz, 0 dB tape speed adjustment
IC101
IC601
RV601
adjustment screw

Ver 1.2

Ver 1.2