Sharp VC-A592U User manual

VC-A592U

VC-H992U

SHARP CORPORATION

VIDEO CASSETTE RECORDER

MODELS

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.

VC-A592U

VC-H992U

SERVICEMANUAL

CONTENTS

Page

1. GENERAL INFORMATION .............................. 4

1-1 FEATURES .................................................4

1-2 SPECIFICATIONS ..................................... 4

1-3 LOCATION OF MAJOR COMPONENTS

AND CONTROL ......................................... 5

2. DISASSEMBLY AND REASSEMBLY .............. 6

2-1 DISASSEMBLY OF MAJOR BLOCKS....... 6

2-2 DISASSEMBLING THE MECHANISM/

MAIN PWB ASSEMBLY............................. 7

2-3 CARES WHEN REASSEMBLING.............. 8

3. FUNCTION OF MAJOR MECHANICAL

PARTS ..............................................................9

4. ADJUSTMENT, REPLACEMENT AND

ASSEMBLY OF MECHANICAL UNITS.......... 11

4-1 MECHANISM CONFIRMATION

ADJUSTMENT JIG .................................. 11

5. ELECTRICAL ADJUSTMENT ........................ 30

5-1 ADJUSTMENT OF HEAD SWITCHING

POINT .......................................................31

Page

5-2 ADJUSTMENT OF FV (False Vertical Sync)

OF STILL PICTURE................................. 31

5-3 CHECKING OF OFF TRACK ................... 31

5-4 ADJUSTMENT OF SIF-INPUT LEVEL .... 32

5-5 ADJUSTMENT OF STEREO

SEPARATION ...........................................32

6. MECHANISM OPERATION FLOWCHART

AND TROUBLESHOOTING GUIDE .............. 33

7. TROUBLESHOOTING ................................... 39

8. BLOCK DIAGRAM ..........................................50

9. SCHEMATIC DIAGRAM AND PWB FOIL

PATTERN .......................................................58

10.PARTS LIST....................................................72

11.EXPLODED VIEW OF MECHANICAL

PARTS ............................................................79

12.PACKING OF THE SET ................................. 83

S39E8VCA592UL

VC-A552U

VC-H992U

IMPORTANT SERVICE NOTES

WARNING :TOREDUCETHERISKOFFIREORELEC-

TRIC SHOCK, DO NOT EXPOSE THIS AP-

PLIANCE TO RAIN OR MOISTURE.

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DO

NOT REMOVE COVER. NO USER-SERVICEABLE

PARTS INSIDE. REFER SERVICING TO QUALIFIED

SERVICE PERSONNEL.

This symbol warns the user of uninsulated voltage

withintheunitthatcancausedangerouselectricshocks.

This symbol alerts the user that there are important

operatingandmaintenanceinstructionsintheliterature

accompanying this unit.

This symbol mark means fast operating fuse.

For continued protection against risk of fire, replace

only with same type fuse F901 (3.0A, 125V).

CAUTION:

BEFORE RETURNING THE VIDEO CASSETTE

RECORDER

Beforereturning the videocassette recorder tothe user,

perform the following safety checks.

1. Inspect all lead dress to make certain that leads are

not pinched or that hardware is not lodged between

thechassisandothermetalpartsinthevideocassette

recorder.

2. Inspect all protective devices such as non-metallic

control knobs, insulation materials, cabinet backs,

adjustmentandcompartmentcoversorshields,isola-

tion resistor/capacitor networks, mechanical insula-

tors etc.

3. To be sure that no shock hazard exists, check for

current in the following manner.

●Plug the AC line cord directly into a 120 volt AC outlet

(Do not use an isolation transformer for this test).

●Using two clip leads, connect a 1.5k ohm, 10 watt

resistorparalleledbya0.15µFcapacitorinserieswith

all exposed metal cabinet parts and a known earth

ground, such as a water pipe or conduit.

●Use an SSVM or VOM with 1000 ohm per volt, or

higher, sensitivity or measure the AC voltage drop

across the resistor (See Diagram).

●Move the resistor connection to earth exposed metal

part having a return path to the chassis (antenna,

metalcabinet,screwheads,knobsandcontrolshafts,

SSVM

AC SCALE

1.5k ohms.

10W

CONNECT TO

KNOWN EARTH

GROUND

TO EXPOSED

METAL PARTS

0.15 µF

TEST PROBE

etc.) and measure the AC voltage drop across the

resistor. Reverse the AC plug on the set and repeat

AC voltage measurements for each exposed part.

Anyreading of0.45V rms (thiscorresponds to0.3mA

rms AC.) or more is excessive and indicates a poten-

tial shock hazard which must be corrected before

returning the video cassette recorder to the owner.

3.0A 125V

VC-A592U

VC-H992U

PRECAUTIONS IN PART REPLACEMENT

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.

(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.

(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 D709.

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: D707 and D706.

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

looseness.

VC-A552U

VC-H992U

1. GENERAL INFORMATION

1-1 FEATURES

• 400 Times Rewind Speed to Fast Forward and Rewind

• EZ Set Up

• S-VHS Quasi Playback

• Double Azimuth 4-Head

•19

µm Clear Picture System (in EP Mode)

• HQ System for Better Resolusion and color Reproduc-

tion

• Multi-Language (English/Spanish/French) OSD (On

Screen Display) with Menu Screen Guidance

• 181-ch PLL Quartz Synthesized Random Access Tuner

with Automatic Channel Setting

• Quick Start with Full Loading Mechanism

• 1-Year, 8-Event Programmable Timer

• Simple Recording Timer

• Univarsal Remote Control

• SHARP Super Picture

• 20 seconds Timer Backup

• Field-Still/Variable Slow/Frame Advance

• Real-Time Counter

• Automatic Daylight Saving-Time (D.S.T.)Adjustment

• Blue Screen Noise Elimination

• Automatic Tracking Control System

• Digital Program Search System (DPSS)

• Skip Search

• Instant Replay

• Auto Zero Back

• Recorded Section Auto Repeat

• Full Automatic Playback

• Function Lock

• Up to 8 Hours of Recording/Playback (with T-160 cassette)

• Automatic Head Cleaning System

• Built-in MTS (Multi-channel TV Sound) Detector

(VC-H992U)

1) Recording system Format: VHS NTSC Standard

Luminance signal: FM recording

Chroma signal: Low frequency converted direct recording

Color system: NTSC

Number of video head: 4

Tape speed: (SP) 33.35 mm/sec

(LP) 16.67 mm/sec (Playback only)

(EP) 11.12 mm/sec

2) Video signal Input level: 0.5 ~ 2.0 Vp-p, 75 ohm unbalanced

Output level: 1.0 Vp-p, 75 ohm unbalanced

Horizontal resolusion: 220 lines (SP mode)

Signal to noise ratio: 45dB (SP mode)

3) Audio signal Input level: – 8 dBs (309mVrms, 47k ohm)

Output level: – 8 dBs (309mVrms, 1k ohm)

Frequency response: 80Hz ~ 10kHz (SP mode linear)

Signal to noise ratio: 43dB (SP mode linear)

Hi-Fi dynamic range: 90dB

HI-Fi Frequency response: 20Hz ~ 20kHz

Hi-Fi Wow and flutter: 0.005% max. with T-120 tape

4) Receiving channel VHF: Channels 2 ~ 13

UHF: Channels 14 ~ 69

CATV: Channels A-8, A-5 ~ W + 84

Antenna Input Impedance: 75 ohm

5) Misc. Fast forward /Rewind time: Approximate 54 second with T-120 cassette

Power source: 120V AC, 60 Hz

Power consumption: 20 W

Allowable ambient temperature: with T-120 tape 5°C to 40°C (41°F to 104°F)

Operating humidity: below 80% RH

Dimensions: 360 (W), 92 (H), 253 (D) mm (14-3/16, 3-5/8, 9-31/32 inch)

Weight: 2.8 kg (6.2 lbs)

Accessories included: 75 ohm coaxial cable, Operation manual, Timer setting card,

Infrared remote control, Dry Battery (2 pcs.)

Note: Specifications may be changed for improvement without notice.

1-2 SPECIFICATIONS

VC-A592U

VC-H992U

1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL

VC-A552U

VC-H992U

SHARP

2. DISASSEMBLY AND REASSEMBLY

2-1 DISASSEMBLY OF MAJOR BLOCKS

TOP CABINET : Remove 2 screws 1.

FRONT PANEL : Remove button 2.

Remove 2 screws 3and 7 clips 4.

OPERATION : Remove 1 screw 5.

PWB

SHIELD ANGLE : Remove1screws6withshieldangle.

MECHANISM/ : Remove 1 screw 7, 1 screw 8, 2

MAIN PWB screws 9, 2 screws 0. Remove 1

screwqwithantennaterminalcover.

Remove 1 screw wwith top cabinet

fix angle.

FRONT PANEL

TOP CABINET

SHIELD

ANGLE

ANTENNA

TERMINAL

COVER

MECHANISM/

MAIN PWB

ASSEMBLY

TOP CABINET

FIX ANGLE

MAIN FRAME

OPERATION

PWB

H/A SHIELD

TOP

VC-A592U

VC-H992U

2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY

1. When removing the mechanism from the main PWB,

removetheantennacover1screw1,andremovethe

antenna cover.

Remove the PWB bottom plate 1 screw 2.

Remove the FFC cable (AA, AD, AH) 3which con-

necting the PWB and the mechanism.

Take out vertically the mechanism so that it does not

damage the adjacent parts.

2. Removing the mechanism and cassette housing.

Remove2screws4fixingthecassettehousingtothe

mechanism, and remove the cassette housing.

MECHANISM CHASSIS

CASSETTE

HOUSING

MAIN PWB

VC-A552U

VC-H992U

START SENSOR

cassette housing. (Conditions: When mechanism and

PWB have been installed)

2. Mechanical initial setting

Feed the pulley feed gear of loading motor with screw

driver. After ascertaining the return to the initial set posi-

tion (*1) install the cassette housing in the specified

position.(Thismethodisappliedonlyforthemechanism.)

PARTS WHICH NEED PARTICULAR CARE

Wheninstalling themechanism chassison thePWBunit,

take care so as to prevent deformation due to contact of

mechanism chassis with REC TIP SW.

Pulley feed gear

Screwdriver

AE CONNECTOR

AL CONNECTOR

Casecon

drive gear

Drive angle of

cassette housing

REC TIP SW

END SENSOR

AC CONNECTOR

Tilt mark (*1)

INSTALLING THE CASSETTE HOUSING

Whenthecassettehousingisinstalledonthemechanism,

the initial setting is essential condition.

There are two initial setting methods, namely electrical

and mechanical.

1. Electrical initial setting

So as to perform initial setting of mechanism execute the

Step1 ofInstallation of cassettehousing. Afterascertain-

ing the return to the initial setting position (*1) install the

2-3 CARES WHEN REASSEMBLING

INSTALLING THE MECHANISM ON PWB

Lower vertically the mechanism, paying attention to the

mechanism edge, and install the mechanism with due

care so that the parts are not damaged. So as to fix the

mechanismtothemainPWBinstalltwohousings.(Fit the

antenna cover to one of them. For other, fix the vicinity of

loading motor and solder joint side of main PWB.) Con-

nect again the FFC cable (AA-MH, AD-ME, AH-MH)

between the mechanism and the main PWB.

VC-A592U

VC-H992U

3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)

No. Function No. Function

1 Full erase head

2 Sup pole base ass’y

3 Tension arm

4 Idler ass’y

5 Pinch drive lever ass’y

6 Supply reel disk

7 Sup main brake

8 Tu main brake

9 Pinch drive cam

10 A/C head ass’y

11 Reverse guide

12 Casecon drive gear

13 Take-up reel disk

14 Pinch roller lever ass’y

1715 10

VC-A552U

VC-H992U

FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)

No. Function No. Function

15 Drum ass’y

16 Loading motor

17 Drum drive motor

18 Tu pole base ass’y

19 Slow brake

20 Master cam

21 Capstan D.D. motor

22 Reel belt

23 Clutch lever

24 Limiter pulley ass'y

26 Shifter

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