Read Sharp VC-MH711HM (serv.man3) Service Manual online
1
In the interests of user-safety (Required by safety
regulations in some countries) the set should be
restored to its original condition and only parts
identical to those specified be used.
regulations in some countries) the set should be
restored to its original condition and only parts
identical to those specified be used.
SY7J5VCA582U/
MODELS
VC-MH711HM
VC-MH712LM
VC-MH712LM
VIDEO CASSETTE RECORDER
SHARP CORPORATION
CONTENTS
Page
SPECIFICATIONS ....................................................................................................................... 3
ROM MAP .................................................................................................................................... 4
CIRCUIT DIAGRAMS .................................................................................................................. 5
REPLACEMENT PARTS LIST ................................................................................................... 17
PACKING OF THE SET ............................................................................................................. 21
ROM MAP .................................................................................................................................... 4
CIRCUIT DIAGRAMS .................................................................................................................. 5
REPLACEMENT PARTS LIST ................................................................................................... 17
PACKING OF THE SET ............................................................................................................. 21
S9940VCM711HM
This service manual covers only those items that
differ from the VC-MH721HM. For further information
on items not covered by this supplement refer to the
Service Manual for VC-MH721HM
differ from the VC-MH721HM. For further information
on items not covered by this supplement refer to the
Service Manual for VC-MH721HM
VC-MH711HM/VC-MH712LM
SERVICE MANUAL
2
PRECAUTIONS IN PART REPLACEMENT
When servicing the unit with power on, be careful of the section marked with white around it.
This is the primary power circuit which is live.
When checking the soldering side in the tape travel mode, make sure first 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 soldering side in the tape travel mode, make sure first 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. Referring to the PWB, fix the sensors tight
enough.
enough.
(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. Do not allow any looseness.
(4) Take-up and supply sensors: D711 and D712.
Be careful not to confuse the setting direction of the parts in reference to the symbols on the PWB. Do not allow
any losseness.
any losseness.
3
Format: VHS PAL standard
Video recording system: Four 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 B-J, S1-S41 (LM only)
RF converter output signal: UHF Channel E21-E69 (Preset to CH E36)
Power requirement: AC230V-240V, 50Hz
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)
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. 250 lines (SP mode with Super Picture)
AUDIO 0 dBs = 0.775 Vrms
Input: Line1: –3.8 dBs, 10k ohm
Line2: –3.8 dBs, 10k ohm
Output: Line1: –3.8 dBs, 1k ohm
Line2: –3.8 dBs, 1k ohm
Rear RCA: –3.8 dBs, 1k ohm
Rear RCA: –3.8 dBs, 1k ohm
S/N ratio: 45 dB min. (SP mode)
Hi-Fi Frequency response: 80 Hz ~ 10 kHz (SP mode)
80 Hz ~ 5 kHz (LP mode)
Hi-Fi dynamic range: 85 dB min.
Hi-Fi WOW and flutter: 0.005% Max.
Hi-Fi Frequency response: 20 Hz ~ 20 kHz
Hi-Fi Distortion: 0.5% Max.
Hi-Fi cross talk (at 1kHz): 55 dB min.
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.
SPECIFICATIONS
4
ROM MAP
MODEL
VC-MH711HM
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
I.REPLAY
JP36
NTPB
JP35
NTSC SKEW
JP34
HEAD2
JP33
HEAD1
JP32
HEAD0
JP31
PDC8bit
JP30
LCD
JP29
POSI89
JP28
R/C CODE
JP27
DNR
JP26
POST CODE
JP25
SAT CTL
JP24
AV LINK
JP23
Hi-Fi
JP22
SORT/CLOCK
JP21
DECODER
JP20
SURROUND
JP19
IGR
JP18
NICAM
JP17
G-CODE1
JP16
G-CODE0
JP15
OEM
JP14
LP
JP13
F-AV
JP12
2 SCART
JP11
VPS8bit
JP10
TUNER2
JP 9
TUNER1
JP 8
TUNER0
JP 7
SYSTEM1
JP 6
SYSTEM0
JP 5
SAT CH VPS OFF
JP 4
LOW POWER
JP 3
SPATIALIZER
JP 2
VPS/PDC
JP 1
COLOR1
JP 0
COLOR0
DISPLAY IN HEXADECIMAL
NOTATION
DISPLAY IN HEXADECIMAL
NOTATION
0:LIGHT UP
1:FLASHING
VC-MH712LM
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0
7
0
7
3
5
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4
5
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
1
0
1
1
1
1
0
1
0
1
0
0
1
1
0
0
0
0
0
0
0
0
---
0
7
0
7
3
5
---
4
5
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
0
0
1
0
0
0
0
0
0
070735/
450020
070735/
450020
0AF/
0AF/
5300 5400
