Read Sharp VC-M303 (serv.man14) Service Manual online
1
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.
SY7J5VCA582U/
MODELS
SERVICE MANUAL
VC-M303HM/LM
VC-M313HM/LM
VC-M313HM/LM
VIDEO CASSETTE RECORDER
SHARP CORPORATION
CONTENTS
Page
1. SPECIFICATIONS ................................................................................................................. 3
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 7
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS .................. 9
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE .............. 32
7. ELECTRICAL TROUBLESHOOTING ................................................................................. 38
8. BLOCK DIAGRAM ............................................................................................................... 49
2. DISASSEMBLY AND REASSEMBLY ................................................................................... 4
3. FUNCTION OF MAJOR MECHANICAL PARTS ................................................................... 7
4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS .................. 9
5. ELECTRICAL ADJUSTMENT ............................................................................................. 28
6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE .............. 32
7. ELECTRICAL TROUBLESHOOTING ................................................................................. 38
8. BLOCK DIAGRAM ............................................................................................................... 49
10. REPLACEMENT PARTS LIST ............................................................................................ 67
11. EXPLODED VIEW OF MECHANICAL PARTS ................................................................... 79
12. PACKING OF THE SET ...................................................................................................... 84
11. EXPLODED VIEW OF MECHANICAL PARTS ................................................................... 79
12. PACKING OF THE SET ...................................................................................................... 84
VC-M313HM
VC-M303HM
S60047VC303HM
2
When servicing the unit with power on, be careful of the section outlined in white.
This is the primary power circuit which is live.
This is the primary power circuit which is live.
When checking the solder side in the tape travel mode, make sure that the tape has been loaded and then turn over
the PWB with due care to the primary power circuit.
Make readjustment, if needed after replacement of part, with the mechanism and its PWB in position in the main frame.
the PWB with due care to the primary power circuit.
Make readjustment, if needed after replacement of part, with the mechanism and its PWB in position in the main frame.
(1) Start and end sensors: Q701 and Q702
Insert the sensor’s projection deep into the upper hole of the holder. Referring to the PWB, fix the sensors tight
enough.
When replacing the mechanism on the PWB care should be taken that the sensors locate into the mechanism
holder.
enough.
When replacing the mechanism on the PWB care should be taken that the sensors locate into the mechanism
holder.
(2) Photocoupler: IC901
Refer to the symbol on the PWB and the anode marking of the part.
(3) Cam switches A and B: D708 and D705.
Adjust the notch of the part to the white marker of the symbol on the PWB. The part must be flat to the PWB.
(4) Take-up and supply sensors: D711 and D712.
Be careful not to confuse the setting direction of parts in reference to the symbols on the PWB. The part must be
flat to the PWB.
flat to the PWB.
PRECAUTIONS IN PART REPLACEMENT
3
1. SPECIFICATIONS
Format: VHS PAL standard
Video recording system: Two rotary heads, helical scan system
Video signal: PAL colour and I signals, 625 lines
Recording/playing time: 240 min max. with SHARP E-240 tape (PAL/SP)
480 min max. with SHARP E-240 tape (PAL/LP)
Tape width: 12.7mm
Tape speed: 23.39 mm/s (PAL/SP)
11.70 mm/s (PAL/LP)
33.35 mm/s (NTSC SP)
33.35 mm/s (NTSC SP)
Antenna: 75 ohm unbalanced
Receiving channel: UHF Channel E21-E69
RF converter output signal: UHF Channel E21-E69 (Preset to CH E36)
Power requirement: AC230V-240V, 50Hz
Power consumption: Approx. 14 W (AC230V/50Hz) and 3.5W max. at stand-by mode
Operating temperature: 5
°
C to 40
°
C
Storage temperature: –20
°
C to 55
°
C
Weight: Approx. 3.2 kg
Dimensions: 360 mm (W) x 284 mm (D) x 93 mm (H)
VIDEO
Input: 1.0 Vp-p, 75 ohm
Output: 1.0 Vp-p, 75 ohm
S/N ratio: 45 dB (SP mode)
Horizontal resolution: Approx. 260 lines (SP mode with Supper Picture)
AUDIO 0 dBs = 0.775 Vrms
Input: Line1: –3.8 dBs, 10k ohm
Output: Line1: –3.8 dBs, 1k ohm
F. AV : -3.8dBs, 47k ohm(VC-M313HM ONLY)
S/N ratio: 46 dB min. (SP mode)
Frequency responce: 80 Hz ~ 10 kHz (SP mode)
80 Hz ~ 5 kHz (LP mode)
Accessories included: 75 ohm coaxial cable
Operation manual
Infrared remote control
Battery
Infrared remote control
Battery
As part of our policy of continuous improvement, we reserve
the right to alter design and specifications without notice.
the right to alter design and specifications without notice.
Note: The antenna must correspond to the new standard DIN 45325
(IEC 169 - 2) for combined UHF/VHF antenna with 75 ohm connector.
4
2. DISASSEMBLY AND REASSEMBLY
2-1 DISASSEMBLY OF MAJOR BLOCKS
TOP CABINET
: Remove 4 screws
1
.
FRONT PANEL
: Remove shuttle switch knob
2
.
Remove 1 screw
3
and 7 clips
4
.
OPERATION
: Remove 1 screw
5
. Take it out
(SHUTTLE JOG)
of connector
6
.
PWB
MECHANISM/
: Remove 2 screws
7
, 1 screw
8
, 1
MAIN PWB
screw
9
.
6
5
1
1
7
4
3
8
9
MAIN FRAME
OPERATION
PWB
PWB
FRONT PANEL
MECHANISM/
MAIN PWB
MAIN PWB
TOP CABINET
STOP
PLAY
REW
FF
