Sony M-740V Manuale utente
M-740V
E Model
Chinese Model
East European Model
SERVICE MANUAL
MICROCASSETTE
TM
-CORDER
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
9-873-089-11
2001B1600-1
© 2001.2
SPECIFICATIONS
Ver 1.0 2001. 02
Model Name Using Similar Mechanism M-730V
Tape Transport Mechanism Type MZ-730V-99
Tape
(normal position type)
Recording system
2-track 1-channel monaural
Speaker
Approx. 3.6 cm (1
7
⁄
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 (2
1
⁄
2
×4
3
⁄
4
×1
1
⁄
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.
2
M-740V
TABLE OF CONTENTS
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.
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.
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
3
M-740V
SECTION 1
GENERAL
EAR
Microphone
Micrófono
z
>PAUSE
CUE/
REVIEW
xZ
VOR
TAPE SPEED
TAPE COUNTER
CUE MARKER
MIC (PLUG
IN POWER)
REC lamp (M-830V)
Indicador REC (M-830V)
REC/BATT lamp (M-740V)
Indicador REC/BATT (M-740V)
FAST PB
EAR
nN
>PAUSE
CUE/
REVIEW
xZ
TAPE SPEED
FAST PB
Tape direction
indicators
Indicadores de
sentido de la cinta DIR.
DIR.
This section is extracted
from instruction manual.
4
M-740V SECTION 2
DISASSEMBLY
•The equipment can be removed using the following procedure.
Note : Follow the disassembly procedure in the numerical order given.
2-1. LID ASSY, CASSETTE
2-2. LID, BATTERY CASE
Set Lid assy, cassette Head, ceramic
(HRPE901,902
)
LED unit
Lid, battery case
Cabinet (rear)
assy
Main board Mechanism
deck
Speaker, Microphone
(MIC901)
Lid assy, cassette
2axis
3axis
4claw
5
1
Zp(Eject/Stop) button
Lid, battery case
1claw
1claw
2
5
M-740V
2-3. CABINET (REAR) ASSY
Note : When installing, fit the knobs and switches.
2-4. SPEAKER, MICROPHONE (MIC901)
2Four screws
(B1.7 ×16)
1Screw
(B1.7 ×5)
3Claw
5Cabinet
(rear) assy
4Claw
s
Switch
(TAPE SPEED)
Switch
(PAUSE)
Knob
(PAUSE)
Knob
(FR)
4Unsolder 2 places.
1Unsolder 2 places.
2Two screws
(B2 ×2.5)
3Speake
r
8Microphone
(MIC901)
5Holder (MIC)
6
7Mic cushion
6
M-740V
2-6. MECHANISM DECK
2-5. MAIN BOARD
1
Unsolder 8 places.
4
Two screws
2
Unsolder 6 places.
6
Main board
3
Unsolder 4 places.
5
6
4Mechanism deck
Button
(EJECT/STOP)
Button
(PLAY)
Button
(REC)
2
1
3
7
M-740V
2-7. LED UNIT
2-8. HEAD, CERAMIC (HRPE901, 902)
Blacket (LED)
Claw
LED unit
1Three screws
(1.7 ×2.3) tapping
2
1Claw
3M1.4, special hea
d
4M1.4, special head
2Arm (pinch roller) assy
5Head, ceramic
(HRPE901, 902)
8
M-740V
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head pinch roller
rubber belts capstan
2. Demagnetize the record/playback/erase 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. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Power supply voltage : 3 Vdc
TAPE SPEED switch : 2.4cm
Torque Measurement
SECTION 3
MECHANICAL ADJUSTMENTS
Record/Playback/Erase Head Azimuth Adjustment
Setting:
VOL control : mechanical mid
TAPE SPEED switch : 2.4cm/s
VOR switch : OFF
FAST PB switch : OFF
Procedure:
1. Mode : Playback
Adjustment Location :
Test Tape
SECTION 4
ELECTRICAL ADJUSTMENTS
2. Turn the adjustment screw to obtain the maximum reading on
level meter.
Note: Several peaks may appear, but the maximum.
First remove the cover (AZ).
EAR jack (J102)
set
16 Ω
test tape
S-2-A030A
(3 kHz, –20 dB) level meter
Remove the cover (AZ)
Head azimuth
adjustment scre
w
(FWD)
(REV)
Tape Tension Measurement
Mode
Forward
Reverse
Fast Forward
Rewind
Torque Meter
CQ-102M
CQ-102MR
CQ-201M
CQ-201M
Meter Reading
0.49 to 0.98 mN •m
(5 to 10 g •cm)
(0.07 to 0.140 oz •inch)
0.49 to 0.98 mN •m
(5 to 10 g •cm)
(0.07 to 0.140 oz •inch)
more than 2.94 mN •m
(more than 30 g •cm)
(more than 0.42 oz •inch)
more than 2.94 mN •m
(more than 30 g •cm)
(more than 0.42 oz •inch)
Mode
Forward
Reverse
Torque Meter
CQ-403M
CQ-403MR
Meter Reading
more than 2.45 mN •m
(more than 25 g)
(more than 0.35 oz)
more than 2.45 mN •m
(more than 25 g)
(more than 0.35 oz)
Type
S-2-A030A
WS-24
Signal
3 kHz, –20 dB
3 kHz, –10 dB
Used for
Head Azimuth Adjustment
Tape Speed Adjustment
Tape Speed
(cm/s)
2.4
1.2/2.4
9
M-740V
Specification Value:
Tape Speed Adjustment
Setting:
VOL control : mechanical mid
VOR switch : OFF
Procedure:
•Reform 2.4 cm/s speed adjustment before 1.2 cm/s speed
adjustment mode : playback
Frequency difference between the beginning and the end of the
tapeshould be within ±0.5%.
Adjustment Location :
First remove the plate, blind.
1. Tape Speed : 2.4 cm/s
Playback WS-24 (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 3,000 Hz.
2. Tape Speed : 1.2 cm/s
Playback WS-24 (tape center part) and adjust RV602 so that
reading on the digital frequency counter becomes 3,000 Hz.
0000
EAR jack (J102)
digital frequenc
y
counter
set
16 Ω
test tape
WS-24: tape speed 1.2/2.4cm/s
(3 kHz, –10 dB)
Remove the
plate, blind.
RV602
(1.2 cm/s)
RV601
(2.4 cm/s) Speed adjustable
resistors
Tape Speed
1.2/2.4 cm/s
Frequency counter
2,880 to 3,120 Hz
10
M-740V
• IC Block Diagrams
IC101 LA4168ML-TE-L
SECTION 5
DIAGRAMS
IC601 LB1877V-TLM
+
–
+
–
+
–
+
–
21
222324
2526272829
30
235
4678910
111 12 13 14 15
16
17
1819
20
300k
EQ MIC
2.2k
30k
2k
PAUSE
POWER
MIC
VCC
Vref R/P
R, F
GVN
VOX
SPEED
ALC
VOX
20k
REC
12
PRE GND
EQ IN
MIC IN
Vref OUT
MIC VCC
R, F OUT
LED DRIVE
R/P SW
PAUSE
P/R MUTE
GVN CONT
GVN Vref
Vs
GVN GND
GVN OUT
PRE NF
PRE OUT
REG IN
REG OUT
ALC CONT
VOX CONT
VOX DELAY
GNV SPEED UP
AUT STOP CONT
AUT STOP IN
PWR IN
PWR OUT1
PWR GND
PWR OUT2
Vcc
UOUT
DR
VCC
LB
FC
OUT
VSP
IN+
VREF
S/S
20 19 18 17 16 15 14 13 12 11
VOUT
WOUT
P-GND
WB
VB
UB
OSC
COM
GND
RI
1 2 3 4 5 6 7 8 9 10
DRIVER STARTUP
DIR LOGIC
STARTUP
DET
WAVEFORM
DET
CURRENT
DET
SPEED
DET
LOCKING
PROTECT
OSC
BIASREF V
TSD +
–
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