VC-M312HM. Service manual front cover to page - Sharp VCR Service Manual (repair manual)

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.

MODELS

Page

SPECIFICATIONS ....................................................................................................................... 3
ROM MAP .................................................................................................................................... 4
CIRCUIT DIAGRAMS .................................................................................................................. 5
REPLACEMENT PARTS LIST ................................................................................................... 17
PACKING OF THE SET ............................................................................................................. 22

S04937VCM302HM

This service manual covers only those items that differ
from the VC-M321HM.  For further information on items not
covered by this supplement refer to the Service Manual for
VC-M321HM.

When servicing the unit with power on, be careful to the section marked white all over.
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.

Insert the sensor’s projection deep into the upper hole of the holder. Referring to the PWB, fix the
sensors tight enough.

Refer to the symbol on the PWB and the anode marking of the part.

Adjust the notch of the part to the white marker of the symbol on the PWB. Do not allow any looseness.

Be careful not to confuse the setting direction of the parts in reference to the symbols on the PWB. Do
not allow any losseness.

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)

Antenna: 75 ohm unbalanced

Receiving channel: UHF Channel E21-E69

RF converter output signal: UHF Channel E21-E69 (Preset to CH E36)

VHF Channel E21-E69; VHF Channels B--J, S1-S61(LM only)

Power requirement: AC230V-240V, 50Hz

Power consumption: Approx. 14 W (AC230V/50Hz) and 4W 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)

(14-3/16" x 11-3/16 " x 3-25/32")

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

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

As part of our policy of continuous improvement, we reserve
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.

MODEL

VC-M302HM

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

070735

350010 

0004300

0:LIGHT UP

1:FLASHING

VC-M312HM 

VC-M302LM

VC-M312LM

--
0
7
0
7
3
5
--
3
5

0
0

0

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
0
1

1
0
0
0

0
0

0

0

0

--
0
7
0
7
3
5
--
3
5

0
0

0

0

0
0
0
0

1

0
0
0
0
0
0
0

0
0
0

0
0
0
0
1

1
0
1
0

0
0
0
1

1
0
0
0

0
0

0

0

0

--
0
7
0
7
3
5
--
3
5

0
0

0

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
3
5
--
3
5

0
0

0

0

0
0
0
0

1

0
0
0

0
0
0
0

0
0
0

0
0
0
0
1

1
0
1
0

0
0
1
0

0
0
0
0
0
0

0

0

0

 070735

350010 

0034300

070735

350010 

0004400

070735

35010 

0034400