Sharp VC-MH80 Manuel utilisateur

VC-M

H80

VC-M

H90

SHA@l=

SERVICE

MANUAL

S04FZVC-MH80l

lvusi

VIDEO

CASSEITE

RECORDER

VC-MH80

MODELS

VC-MH90

the

interests

user-safety

(Required by

safety

regu-

lations

some

countries)

the

set

should

restored

CONTENTS

Page

SPECIFICATIONS .._........_.........................................._..............._...........................

DISASSEMBLY

AND

REASSEMBLY

FUNCTION OF MAJOR

MECHANICAL

PARTS

.._..........................................

ADJUSTMENT, REPLACEMENT

AND

ASSEMBLY

MECHANICAL

UNITS

ELECTRICAL

ADJUSTMENT

.._................................_.........._........

MECHANISM OPERATION

FLOW

CHART

AND

TROUBLESHOOTING GUIDE

TROUBLESHOOTING

49;

BLOCK DIAGRAMS

.._......._..._..................._.._......_...._........................._.._....

CIRCUIT

DIARAM

AND

PWB

FOIL PATTERN

10.

REPLACEMENT

PARTS

LIST

105

EXPLODED

VIEWS

..r........................................................._............................

127

12.

PACKING

THE

SET

.._.................................................................

131

SHARP

CORPORATION

VC-MH80

VC-MH90

PRECAUTIONS IN PART REPLACEMENT

When servicing the

unit

with

power

on,

careful to the section

marked

white

all

over.

This

the

primary

power

circuit which

live.

When checking the soldering side in the tape travel mode, make sure first that the tape has

b;en

loaded and

then turn over the PWB with due care to the primacy 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: D710 and D709.

Insert the sensor’s projection deep into the upper hole of the holder

(LHLDZ1893AJOO).

Referring to the

PWB, fix the sensors tight enough.

(2) Photocoupler

RH-FX0005GEZZ:

IC901

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

(3) Cam switches A and

(RH-PX0231GEZZ)

D714 and

D713.

Adjust the notch of the part to the white marker of the symbol on the PWB. Do not allow a6y looseness.

(4) Take-up and supply sensors

(RH-PX0232GEZZ):

D712 and D711.

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

allow any looseness.

(5) Diode bridge (RH-DX0083GEZZ): D901.

Adjust the

marking of the pat-t to the

symbol’scathode

marking on the PWB.

VC-MH80

VC-M

H90

Format:

Videorecording.system:

Video signal:

Recording/playing time:

Tape width:

Tape speed:

Antenna:

Receiving channel:

RF converter output signal:

Power requirement:

Powerconsumption:

Operating temperature:

Storage temperature:

Weight:

Dimensions:

VIDEO

Input:

output:

S/N ratio:

Horizontal resolution:

AUDIO

Input:

output:

Hi-Fi dynamic range:

Normal S/N ratio:

Frequency

responce:

Accessories included:

SPECIFICATIONS

VHS

PAlJSECAMlMESECAMINTSC

standard

(VCMH80)

VHS

PAL/MESECAM/NTSC

standard

(VGMH90)

Two rotary heads, helical scan system

PAL-ISECAMINTSC

colour and

B/C,I,

D/K, Msignals, 625 lines

240 min max. with SHARPE-120 tape (LP mode)

480 min max. with SHARP

E-240,tape

&P-mode)

480 min max. with SHARP

T-.160

tape

(EP.mode)

12.7mm

23.39 mm/s (PAL SP)

11.70

mm/s (PAL LP)

33.35

mm/s(NTSCSP)

16.68mm/s(NTSC

LP) 1

l.lZmm/s(NTSC

EP)

75 ohm unbalanced

VHF Channel

1A-520

UHF Channel

E21-US83

(VGMH80)

UHF Channel

E21-E69

(VGMH90)

VHF Channel

E30-E39

(preset to CH E39

(VGMH80)

or CH E36 (VC-MH90))

AC1

lo-24OV,

50160Hz

Approx. 20 WatAC220VI50Hz

(VC-MHSO)

Approx. 22W at

AC220V/50Hz

(VC-MH90)

5°C to 40°C

20”Cto60”C

Approx. 4.5 kg

430 mm (W)

340

mm(D)

96 mm (H)

0.5

2.0 Vp-p, 75 ohm

Vp-p, 75 ohm

(PAL SP)

250 lines (PAL SP)

dBs

0.775 Vrms

Line: -8

dBs,

47kohm

Line:

dBs,

ohm

85dB type

40dB

(Hi-Fi)

20Hz-20kHz

(Normal)

80Hz-5kHz

75 ohm coaxial cable

Operation manual

Infrared remote control

Battery

(2~~s.)

AC plug adaptor

(VC-MH90)

AV cable

of our policy of continuous

improvement,:we

reserve

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.

vc-ma0

VC-MH90

2. DISASSEMBLY AND REASSEMBLY

2-1

DISASSEMBLY OF MAJOR BLOCKS

TOP CABINET

Remove 4 screws

OPERATION PWB

Disconnect the

FFC

from the

BOlTOM

PLATE

Remove 5 screws

and 2

screws

socket

Remove 2 clips

do,

OSD/MPX PWB

Disconnect the

FFCs

from the 3

FRONT PANEL

Remove 7 clips

TIMER PWB

Remove 1 screw

Disconnect sockets

Take out 3 holders

the

FFC

,from the sockets

0.:

and

. Remove 3 clips

TOP CABINET

VC-M

H80

VC-MH90

MECHANISM/

MAIN PWB

ASSEMBLY

Remove 2 screws

@,2

screws

@and

2 screws

.Remove

screws @from below the main

frame. Take out the socket,

Remove 2 screws

and take

out the tuner holder. Rempve

1 screw

@I.

Lift the antenna terminal block

and take the mechamism/main

PWB assembly out of the main

frame. Be careful not to hit the

REC TIP switch located below

the cassette controller.

TIfhER

PWB

&XM+APXPWB

VGMH80

VC47lH90

HEADAMPLIFIER

Remove

screw

HQLDE+

ANTENN

Remove ‘1 screw

MECHANISM

Disconnect the

FFCs

from 2

CHASSISI

sockets

CASSETTE

Disconnect the connectors

CONTROLLER

from 2 sockets

Take the

ASSEMBLY

relay PWB out of the socket

Rmove 1 screw

and detach

the

head.amplifier

unit.

Disconnect the

FFC

from the

socket

. Remove 2 screws

from:behind the main PWB.

Lift the mechanism chassis/

cassette controller assembly

vertically to take it out of the

main PWB.

CASSETTE

CONTROLLER

Remove 2 screws

CASSETTE

CONTROLLER

HEADAMPLIFIER

CHASSIS/CASSETTE

CONTROLLER

ASSEMBLY

-ANTENNA

TERMINAL BOX

VC-MH80

VC-MH90

2;2-

PRECAUTIONS IN-REASSEMBLING

MOUNTING THE CASSETTE CONTROLLER

Initial setting is indispensable

before placing the cassette controller in the mechanism. The initial

setting

is made in two ways; electrical and mechanical.

Electrical setting:

(1) Make a short-circuit between

TP5001

and TP5002

of the

plug

(TPSOO*)

which is on the

timer

PWB.

(2) Plug in the AC

power

cord and make sure the mechanism is in the initial setting position

(*l)

(3) Unplug the

power cord. Remove the above short-circuit.

NOTE: This method is used when the mechanism has been already set on its-PWB.

Cassette control

drive

gear

Mechanical setting:

Turn the loading motor’s

pulley feed gear using a

screwdriver

and be sure

that the mechanism is

back to its initial setting

position

(*l).

Now place

Drive

angle

the cassette controller in

cassette control

position. (This method is

applicable for the

mechanism alone.)

Phase

matching

point

COUPLING

TH.E.MECHANISM

TO THE PWB

Match the mechanism’s projections with the two

symbots

(r&nd

reference and oval sub-reference) on the

main PWB. Place the mechanism straight-down in position with due care so that the mechanism chassis’s outer

edges should not damage any parts nearby.

Tighten up the two screws (one for fixing the mechanism and

th6

head amplifier shield, the other on the main

PWB’s

soldering side and located near the loading motor) to fix the mechanism and main PWB. Reconnect the

FFC

cables

(AG,

AD and ZA) and harnesses (AE and AL) between the mechanism and main PWB.

Parts to pay attention to:

Stat-t and end sensors

10, D709

Record tip switch

5701

Take special care of the MC-AC connector

(board to board) between the mechanism

and main PWB.

VC-MH80

VC-MH90

3:FUNCTlON

OF MAJOR MECHANICAL PARTS (TOP VIEW)

Drum

Motor

Auto

Head

2oCleaner

Ass'y

Full

Erase

Head,

Ass'y

Supply

Pole

Base

Ass'y

Main

Supply

Brake

Lever

Tension

Arm

Ass

SUPPlY

A/c

Head

Ass'y

Pinch Roller

Lever

Ass'y

Pinch

Drive

Cam

Pihch

Drive

Lever

Ass'y

Reverse

Guide

Main

Take-Up

Brake Lever

Cassette

Housing

Drive

Gea

Take-Up

Lock

Lever

Reel

Idler

Clutch

No.

Function

No.

Function

Full

erase head asf’y

13.

Erase the whole records on the tape in the recording Reverse guide

Pulls out the tape and controls the tape drive train

mode. heightwith the upper and lower guides.

Tension arm ass’y

Detects the tension of tape while running, and brakes

the supply reel disk via the tension band.

Main supply brake lever

Brakes the supply reel disk to prevent tape slackening

when the unit is stopped in fast forward or rewind

mode.

Main take-up brake lever

Brakes the take-up reel disk to prevent tape slackening

when the unit is stopped in fast forward or rewind

mode.

16.

Pinch roller lever ass’y

Press-fits the tape to the capstan during tape running.

The right protrusion switches the clutch of the cassette

housing control assembly in “tape eject”, and makes

the mechanism eject the tape.

18.

Loading motor

A motive power which drives the mechanism. It

transmits the power to the master cam and cassette

housing control assembly.

VC-MH80

VC-MH90

FUNCTION OF

MAIOR

MECHANICAL PARTS

(BOlTOM

VIEW)

Loading Gear

Capstan

Motor

Reel Belt

Slow

Brake Lever

Master Cam

assett Housing

Drive Gear

Connect Gear

Clutch Gear

Connect

Arm

Reel

Pulley

No.

Function

No.

Function

Slow brake lever

Reel pulley

Gets in contact with the capstan

D.D.

motor linking to Transmits the power of the capstan

D.D.

motor to the

the master cam in the slow still mode, and brakes it to a reel disk via the reel idler.

certain degree.

3. Capstan D.D. motor

A motive power which runs the tape. It transmits the

power via the reel belt.

Shifter

Transmits the operation of the master cam to break

and loading gear.

Reel belt

Transmits the

powerto

run the tape to the reel pulley.

Take-up loading gear

Shifts the take-up pole base and guide roller via the

loading relay gear, and applies the tape around the

drum assembly, as well as transmits the power to the

supply loading gear.

VC-MH80

VC-MH90

-4.

ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL

UNITS

Here we will describe a relatively simple service

work in the field, not referring to the more

complicated repairs which would require the use of

special equipment and tools (drum assembly

replacement, for example).

We are sure that the easy-to-handle tools listed

below would be more than handy for periodical

maintenance to keep the machine in its original

working condition.

TOOLS NECESSARY FOR ADJUSTING THE

MECHANiCAL

UNITS

The following tools are required for proper service and satisfactory repair.

No.

Jig Item

Part No.

Reel Disk Height Adjusting Jig

Master Plane Jig

JiGRH0002

JiGMPOOOl

A/C

Head Tilt Adjusting Jig

JiGACH-A323U

Torque Gauge (909)

Torque Gauge (1.2 kg)

JiGTG0090

JiGTGl200

Gauge Head

JiGTH0006

Cassette Torque Meter

JiGVHT-063

Tension Gauge

(3OC.4)

Tension Gauge

(2.Okg)

Hex Wrench (0.9mm)

Hex Wrench (1.2mm)

Hex Wrench (1.5mm)

Alignment Tape (PAL)

Alignment Tape (NTSC)

JiGSG0300

JiGSG2000

JiGHW0009

JiGHW0012

JiGHW0015

VROCPSV

VRONBZGS

Tension Gauge Adapter

JiGADP003

:*I

Confzration

Remarks

These Jigs are used for checking and

adjusting the reel disk height.

This Jig is used for setting the A/C

head tilt.

;

These Jigs are used for checking and

adjusting the torque of take-up and

supply reel disks.

This cassette torque meter is used

for checking and adjusting the

torque of take-up for measuring

tape back tension.

There are two gauges used for the

tension measurements, 300

and

2.0 kg.

These Jigs are used for loosening or

tightening special hexagon type

screws.

These tapes are especially used for

electrical fine adjustment.

This Jig is used with the tension

gauge. Rotary transformer clear-

ance adjusting jig.

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