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M-740V |
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SERVICE MANUAL |
E Model |
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Ver 1.0 2001. 02 |
Chinese Model |
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East European Model |
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Model Name Using Similar Mechanism |
M-730V |
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Tape Transport Mechanism Type |
MZ-730V-99 |
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SPECIFICATIONS
Tape
(normal position type)
Recording system
2-track 1-channel monaural
Speaker
Approx. 3.6 cm (17⁄16 in.) dia.
Tape speed
2.4 cm/s (15⁄16 ips), 1.2 cm/s (15⁄32 ips)
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 (21⁄2 × 43⁄4 × 11⁄16 in.) incl. projecting 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.
MICROCASSETTETM-CORDER
9-873-089-11 Sony Corporation
2001B1600-1 Audio Entertainment Group
© 2001.2 |
General Engineering Dept. |
M-740V
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TABLE OF CONTENTS |
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1. GENERAL .................................................................... |
3 |
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2. DISASSEMBLY |
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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 |
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3. MECHANICAL ADJUSTMENTS .............................. |
8 |
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4. ELECTRICAL ADJUSTMENTS ............................... |
8 |
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5. DIAGRAMS |
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5-1. |
Block Diagram ............................................................ |
11 |
5-2. |
Printed Wiring Board ................................................... |
12 |
5-3. |
Schematic Diagram ..................................................... |
13 |
6. EXPLODED VIEWS |
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6-1. |
Cabinet Section ........................................................... |
14 |
6-2. Mechanism Deck Section (1) ...................................... |
15 |
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6-3. Mechanism Deck Section (2) ...................................... |
16 |
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7. ELECTRICAL PARTS LIST..................................... |
17 |
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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 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.
2
M-740V
SECTION 1
GENERAL 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 |
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Lid assy, cassette |
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Cabinet (rear) |
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Speaker, Microphone |
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Main board |
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Mechanism |
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Head, ceramic |
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assy |
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(MIC901) |
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deck |
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(HRPE901,902) |
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Lid, battery case |
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LED unit |
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Note : Follow the disassembly procedure in the numerical order given.
2-1. LID ASSY, CASSETTE
Lid assy, cassette
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4 claw |
3 axis |
5 |
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2 axis
1
Zp(Eject/Stop) button
2-2. LID, BATTERY CASE
2
Lid, battery case
1 claw
1 claw
4
M-740V
2-3. CABINET (REAR) ASSY
Note : When installing, fit the knobs and switches.
2 Four screws
(B1.7 × 16)
1Screw (B1.7 × 5)
5 Cabinet |
3 Claw |
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(rear) assy |
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Knob (PAUSE)
Knob (FR)
4 Claws
Switch (PAUSE)
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Switch |
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(TAPE SPEED) |
2-4. SPEAKER, MICROPHONE (MIC901) |
2Two screws |
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(B2 × 2.5) |
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1 Unsolder 2 places. |
4 Unsolder 2 places. |
3 Speaker |
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5 Holder (MIC)
6
8 Microphone |
7 Mic cushion |
(MIC901) |
5
M-740V
2-5. MAIN BOARD
4Two screws
6 Main board
1 Unsolder 8 places.
3 Unsolder 4 places.
2 Unsolder 6 places.
5
6
2-6. MECHANISM DECK
4 Mechanism deck
2
Button (REC)
Button |
1 |
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(PLAY) |
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Button |
3 |
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(EJECT/STOP) |
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6
M-740V
2-7. LED UNIT
Blacket (LED)
1Three screws
(1.7 × 2.3) tapping
2
LED unit
Claw
2-8. HEAD, CERAMIC (HRPE901, 902)
2 Arm (pinch roller) assy
3 M1.4, special head
4 M1.4, special head
1 Claw
5Head, ceramic (HRPE901, 902)
7
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