Sharp VC-M304 (serv.man5) Service Manual ▷ View 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 speci-
fied be used.
tions in some countries) the set should be restored to its
original condition and only parts identical to those speci-
fied be used.
SY7J5VCA582U/
MODELS
VC-M304HM
VC-M304LM
VC-M314LM
VC-M304LM
VC-M314LM
VIDEO CASSETTE RECORDER
CONTENTS
Page
SPECIFICATIONS ....................................................................................................................... 3
ROM MAP .................................................................................................................................... 4
REPLACEMENT PARTS LIST ..................................................................................................... 5
PACKING OF THE SET ............................................................................................................... 9
ROM MAP .................................................................................................................................... 4
REPLACEMENT PARTS LIST ..................................................................................................... 5
PACKING OF THE SET ............................................................................................................... 9
S70158VM304HM
This service manual covers only those items that differ
from the VC-M314HM. For further information on items not
covered by this supplement refer to the Service Manual for
VC-M314HM.
from the VC-M314HM. For further information on items not
covered by this supplement refer to the Service Manual for
VC-M314HM.
SHARP CORPORATION
VC-M304HM
SUPPLEMENT SERVICE MANUAL
VC-M304LM
VC-M314lM
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.
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.
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.
(1) Start and end sensors: Q701 and Q702
Insert the sensor’s projection deep into the upper hole of the holder. Make sure the PWB sensors are securely
fitted.
When replacing the mechanism on the PWB care should be taken that the sensors locate into the mechanism
holder.
fitted.
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 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 these parts in reference to the symbols on the PWB. The part
must be flat to the PWB.
must be flat to the PWB.
PRECAUTIONS IN PART REPLACEMENT
3
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 an E-240 tape SP
480 min max. with an E-240 tape LP
Tape width: 12.7mm
Tape speed: 23.39 mm/s SP
11.70 mm/s LP
Antenna: 75 ohm unbalanced
Receiving channel: UHF Channel E21-E69;
VHF Channel A
~
J,S1-S41(LM Models only)
RF converter output signal: UHF Channel E21-E69 (Preset to CH E36)
Power requirement: AC230V-240V, 50Hz
Power consumption: Approx. 15W (AC230V/50Hz) and 3W max. in 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 289 mm (D) x 93 mm (H)
(14-3/16" x 12-1/32" x 3-21/32")
VIDEO
Input: 1.0 Vp-p, 75 ohm
Output: 1.0 Vp-p, 75 ohm
S/N ratio: 48 dB (SP mode)
Horizontal resolution: Approx. 260 lines (SP mode with Super Picture)
AUDIO 0 dBs = 0.775 Vrms
Input: Line1: –3.8 dBs, 10k ohm
Output: Line1: –3.8 dBs, 1k ohm
S/N ratio: 46 dB min. (SP mode)
Frequency response: 80 Hz ~ 10 kHz (SP mode)
80 Hz ~ 5 kHz (LP mode)
Accessories included: 75 ohm coaxial cable
Operation manual
Infrared remote control
Batteries
Infrared remote control
Batteries
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
ROM MAP
MODEL
VC-M304HM
blank
blank
EP n * *
NTSC Luminance level
EP n * *
NTSC Chrominance level
SP n * *
NTSC Luminance level
SP n * *
NTSC Chrominance level
LP p * *
PAL Luminance level
LP p * *
PAL Chrominance level
blank
blank
SP p * *
PAL Luminance level
SP p * *
PAL Chrominance level
"0"
fixed
JP39
A.DUB
JP38
NOT SLOW ATR
JP37
SQ PB
JP36
NTSC PB
JP35
NTSC SKEW
JP34
HEAD2
JP33
HEAD1
JP32
HEAD0
JP31
GAMMA correction
JP30
L/P-5 min
JP29
84 channel
JP28
R/C CODE 1
JP27
DNR
JP26
POST CODE
JP25
SAT CTL
JP24
AV LINK / 16 x 9
JP23
Hi-Fi
JP22
SORT/CLOCK
JP21
DECODER
JP20
SURROUND
JP19
IGR
JP18
NICAM
JP17
G-CODE1
JP16
G-CODE0
JP15
OEM
JP14
LP mode
JP13
F-AV
JP12
2 SCART
JP11
No RF OUT
JP10
TUNER2
JP 9
TUNER1
JP 8
TUNER0
JP 7
SYSTEM1
JP 6
SYSTEM0
JP 5
X 380 FF/REW
JP 4
LOW POWER
JP 3
N/A
JP 2
VPS/PDC
JP 1
COLOUR 1
JP 0
COLOUR 0
DISPLAY IN HEXADECIMAL
NOTATION
DISPLAY IN HEXADECIMAL
NOTATION
0:LIGHT UP
1:FLASHING
VC-M304LM
---
0
7
0
7
0
7
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3
4
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
---
0
7
0
7
0
7
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3
4
0
0
1
0
0
0
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1
0
0
0
0
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0
0
1
1
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
VC-M314LM
070734
0034
000014
070734
0044
300014
070734
0044
000014
---
0
7
0
7
0
7
---
3
4
0
0
1
0
0
0
0
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1
0
0
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0
0
0
0
0
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0
0
0
0
0
0
0
1
0
0
0
0
1
1
0
0
0
0
0
0
0
0
