Sony M-740-V Service manual
M-740V
SERVICE MANUAL
Ver 1.0 2001. 02
SPECIFICATIONS
E Model
Chinese Model
East European Model
Model Name Using Similar Mechanism M-730V
Tape Transport Mechanism Type MZ-730V-99
Tape
Recording system
2-track 1-channel monaural
Speaker
Approx. 3.6 cm (1
Tape speed
2.4 cm/s (
Frequency range
300 - 4,000 Hz (with TAPE SPEED switch at 2.4 cm/s)
Input
Microphone input jack (minijack/PLUG IN POWER)
sensitivity 0.22 mV for 3 kilohms or lower impedance microphone
Output
Earphone jack (minijack) for 8 - 300 ohms earphone
Power output (at 10% harmonic distortion)
250 mW
Power requirements
3 V DC batteries R6 (size AA) × 2/External DC 3V power sources
Dimensions (w/h/d)
Approx. 62.2 × 120.5 × 25.5 mm (2
parts and controls
Mass
Approx. 130 g (4.6 oz)
Supplied accessories
Microcassette tape MC-30 (1) (European model only)
Batteries R6P (SR) (2) (European model only)
Carrying pouch (1) (M-830V and European model of M-740V only)
Design and specifications are subject to change without notice.
(normal position type)
7
⁄16 in.) dia.
15
⁄16 ips), 1.2 cm/s (15⁄32 ips)
1
⁄2 × 43⁄4 × 11⁄16 in.) incl. projecting
9-873-089-11
2001B1600-1
© 2001.2
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
MICROCASSETTE
-CORDER
TM
M-740V
TABLE OF CONTENTS
1. GENERAL ....................................................................3
2. DISASSEMBLY
2-1. Lid Assy, Cassette.......................................................... 4
2-2. Lid, Battery Case ........................................................... 4
2-3. Cabinet (Rear) Assy....................................................... 5
2-4. Speaker Assy , Microphone ............................................5
2-5. Main Board.................................................................... 6
2-6. Mechanism Deck ........................................................... 6
2-7. LED Unit ....................................................................... 7
2-8. Head, Creamic (HRPE901, 902) ................................... 7
3. MECHANICAL ADJUSTMENTS ..............................8
4. ELECTRICAL ADJUSTMENTS ...............................8
5. DIAGRAMS
5-1. Block Diagram ............................................................ 11
5-2. Printed Wiring Board................................................... 12
5-3. Schematic Diagram .....................................................13
6. EXPLODED VIEWS
6-1. Cabinet Section ........................................................... 14
6-2. Mechanism Deck Section (1) ......................................15
6-3. Mechanism Deck Section (2) ......................................16
7. ELECTRICAL PARTS LIST..................................... 17
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.
2
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.
SECTION 1
GENERAL
M-740V
This section is extracted
from instruction manual.
EAR
REC lamp (M-830V)
Indicador REC (M-830V)
REC/BATT lamp (M-740V)
Indicador REC/BATT (M-740V)
VOR
FAST PB
TAPE COUNTER
CUE MARKER
EAR
FAST PB
Tape direction
indicators
Indicadores de
sentido de la cinta
MIC (PLUG
IN POWER)
Microphone
Micrófono
> PAUSE
z
CUE/
REVIEW
TAPE SPEED
xZ
DIR.
> PAUSE
nN
CUE/
REVIEW
TAPE SPEED
xZ
DIR.
3
M-740V
)
SECTION 2
DISASSEMBLY
• The equipment can be removed using the following procedure.
Set Lid assy, cassette
Lid, battery case
Note : Follow the disassembly procedure in the numerical order given.
Cabinet (rear)
assy
2-1. LID ASSY, CASSETTE
Speaker, Microphone
(MIC901)
Lid assy, cassette
Main board
4 claw
Mechanism
deck
Head, ceramic
(HRPE901,902
LED unit
2-2. LID, BATTERY CASE
2 axis
3 axis
Zp(Eject/Stop) button
2
Lid, battery case
5
1
1 claw
1 claw
4
2-3. CABINET (REAR) ASSY
s
r
Note : When installing, fit the knobs and switches.
M-740V
2 Four screws
(B1.7 × 16)
1 Screw
(B1.7 × 5)
5 Cabinet (rear) assy
Knob
(PAUSE)
Switch
(PAUSE)
3 Claw
Knob
(FR)
4 Claw
Switch
(TAPE SPEED)
2-4. SPEAKER, MICROPHONE (MIC901)
4 Unsolder 2 places.
5 Holder (MIC)
6
2 Two screws
(B2 × 2.5)
1 Unsolder 2 places.
3 Speake
8 Microphone
(MIC901)
7 Mic cushion
5
M-740V
2-5. MAIN BOARD
1
Unsolder 8 places.
2
Unsolder 6 places.
4
Two screws
6
Main board
3
Unsolder 4 places.
5
6
2-6. MECHANISM DECK
Button
(REC)
Button
(PLAY)
Button
(EJECT/STOP)
4 Mechanism deck
2
1
3
6
2-7. LED UNIT
d
Blacket (LED)
2
Claw
M-740V
1 Three screws
(1.7 × 2.3) tapping
LED unit
2-8. HEAD, CERAMIC (HRPE901, 902)
4 M1.4, special head
5 Head, ceramic
(HRPE901, 902)
2 Arm (pinch roller) assy
3 M1.4, special hea
1 Claw
7
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