Memorex Mvr2031 User manual

SERVICE MANUAL

Design and specifications are subject to change without notice.

MVR2031

VIDEO CASSETTE RECORDER

ORIGINAL

MFR’S VERSION A

SERVICING NOTICES ON CHECKING

As for the places which need special attentions,

they are indicated with the labels or seals on the

cabinet, chassis and parts. Make sure to keep the

indications and notices in the operation manual.

PERFORM A SAFETY CHECK AFTER

SERVICING

Confirm that the screws, parts and wiring which

were removed in order to service are put in the

original positions, or whether there are the

portions which are deteriorated around the

serviced places serviced or not. Check the

insulation between the antenna terminal or

external metal and the AC cord plug blades.

And be sure the safety of that.

2. USE THE DESIGNATED PARTS

The parts in this equipment have the specific

characters of incombustibility and withstand

voltage for safety. Therefore, the part which is

replaced should be used the part which has

the same character.

Especially as to the important parts for safety

which is indicated in the circuit diagram or the

table of parts as a mark, the designated

parts must be used.

1. KEEP THE NOTICES 3. PUT PARTS AND WIRES IN THE

ORIGINAL POSITION AFTER

ASSEMBLING OR WIRING

There are parts which use the insulation

material such as a tube or tape for safety, or

which are assembled in the condition that

these do not contact with the printed board.

The inside wiring is designed not to get closer

to the pyrogenic parts and high voltage parts.

Therefore, put these parts in the original

positions.

Please include the following informations when you order parts. (Particularly the VERSION LETTER.)

1. MODEL NUMBER and VERSION LETTER

The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be

found at the end of the SERIAL NUMBER.

2. PART NO. and DESCRIPTION

You can find it in your SERVICE MANUAL.

HOWTO ORDER PARTS

A1-1

CONTENTS

A2-1

SERVICING NOTICES ON CHECKING .....................................................................................

HOW TO ORDER PARTS .............................................................................................................

CONTENTS ................................................................................................................................

GENERAL SPECIFICATIONS.......................................................................................................

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS.............................................. .

2. REMOVAL OF DECK PARTS...............................................................................................

3. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ..................................................

KEY TO ABBREVIATIONS ...........................................................................................................

SERVICE MODE LIST ...................................................................................................................

PREVENTIVE CHECKS AND SERVICE INTERVALS.................................................................

SERVICING FIXTURES AND TOOLS ..........................................................................................

PREPARATION FOR SERVICING................................................................................................

MECHANICAL ADJUSTMENTS ...................................................................................................

ELECTRICAL ADJUSTMENTS.....................................................................................................

BLOCK DIAGRAMS

Y/C/AUDIO/CCD/HEAD AMP ....................................................................................................

SYSTEM CONTROL/SERVO.....................................................................................................

TUNER........................................................................................................................................

OPERATION/POWER ................................................................................................................

PRINTED CIRCUIT BOARDS

SYSCON/OPERATION ..............................................................................................................

SCHEMATIC DIAGRAMS

Y/C/AUDIO/CCD/HEAD AMP ....................................................................................................

SYSTEM CONTROL/SERVO.....................................................................................................

POWER ......................................................................................................................................

OPERATION...............................................................................................................................

TUNER........................................................................................................................................

INTERCONNECTION DIAGRAM ..................................................................................................

WAVEFORMS ................................................................................................................................

MECHANICAL EXPLODED VIEW ................................................................................................

CHASSIS EXPLODED VIEWS ......................................................................................................

MECHANICAL REPLACEMENT PARTS LIST ............................................................................

CHASSIS REPLACEMENT PARTS LIST.....................................................................................

ELECTRICAL REPLACEMENT PARTS LIST............................................................................

A1-1

A2-1

A3-1~A3-4

B1-1

B2-1~B2-6

B3-1, B3-2

C1-1, C1-2

C2-1

C3-1

C4-1

D1-1~D1-4

D2-1, D2-2

E-1, E-2

E-3, E-4

E-5, E-6

E-7, E-8

F-1 ~ F-4

G-1, G-2

G-3, G-4

G-5, G-6

G-7, G-8

G-9, G-10

G-11, G-12

H-1

I-1

I-2, I-3

J1-1

J2-1

J3-1

GENERAL SPECIFICATIONS

G-1 VCR System VHS Player / Recorder

System Video System NTSC

Hi-Fi STEREO No

NTSC PB(PAL60Hz) No

Deck DECK OVD-7

Loading System Front

Motor 3

Heads Video Head 4Head

FM Audio Head No

Normal Audio /Control Mono / Yes

Erase(Full Track Erase) Yes

Tape Rec PAL -

Speed NTSC SP/SLP

Play PAL -

NTSC SP/LP/SLP

Fast Forward / Rewind Time (Approx.) FF:4'50"/REW:2'30"

with Cassette T-120

Forward/Reverse NTSC or PAL-M SP/LP/SLP=3x,5x/7x,9x/9x,15x

Picture Search PAL or SECAM -

Frame Advance Slow 1/10

Slow Speed Variable Slow 1/10

G-2 Tuning Broadcasting System US System M

System Tuner and System 1Tuner

Receive CH Destination USA(w/CATV)

Tuning System F-Synth

Input Impedance VHF/UHF 75 OHM

CH Coverage 2-69,4A,A-5~ A-1,A~I, J~ W

W+1~W+84

Intermediate Picture(FP) 45.75MHz

Frequency Sound(FS) 41.25MHz

FP-FS 4.50MHz

Preset CH No

RF Converter Output Yes

Channel 3 or 4 ch

Level/Impedance 66dBu /75ohm

Sound Selector No

Stereo/Dual TV Sound No

G-3 Power Power Source AC 120V,60Hz

DC -

Power Consumption Power On(at AC) 8W at 120V 60Hz

Stand by (at AC) 1.8W at 120V 60Hz

Per Year - kWh/Year

Protector Power Fuse Yes

Dew Sensor No

G-4 Regulation Safety UL

Radiation FCC

G-5 Temperature Operation 5oC - 40oC

Storage -20oC - 60oC

G-6 Operating Humidity Less then 80% RH

G-7 Signal Video Signal Input Level 1 V p-p/75 ohm

Output Level 1 V p-p/75 ohm

S/N Ratio (Weighted) 50

Horizontal Resolution at SP Mode 230Line

Audio Signal Input Level -8dB/50Kohm

(0dB=0.775Vrms) Output Level -8dB/1Kohm

S/N Ratio at SP (Weighted) 42dB

Harmonic Distortion (1KHz) 1.5%

Frequency Response at SP 100Hz - 10kHz

at LP 100Hz - 6kHz

at SLP 100Hz - 4kHz

Hi-Fi Audio Signal Dynamic Range : More than -

Frequency Response -

Wow And Flutter : Less than -

Channel Separation : More than -

Harmonic Distortion : Less than -

G-8 On Screen Menu Yes

Display Menu Type Character

ATS No

Timer Rec Set Yes

Auto Repeat On/Off Yes

SAP On Off No

CH Set-Up Yes

TV/CATV Yes

Auto CH Memory Yes

Add/Delete Yes

A3-1

GENERAL SPECIFICATIONS

Pin Code Registration No

System Set-Up No

Clock Set Yes (Calendar 12H)

Language Yes

No Noise Back Ground Yes

G-CODE(or SHOWVIEW or PLUSCODE)No. Entry No

NICAM 1/2,NICAM Off,Audio Output No

Stereo,Audio Output,SAP No

Play/Stop/FF/Rew/Rec/OTR/T-Rec/Pause/Eject/Tape In (Symbol Mark) Yes

CH/AV Yes

Clock Yes

Repeat Yes

Pin Code No

Tape Counter Yes

Index No

Hotel Lock No

Tape Speed Yes

Manual Tracking (Bar Setting) No

Hi-Fi No

S-Repeat/SR-R/SR-Play No

VPS No

PDC No

G-9 OSD Language English French Spanish

OSD Language Setting English

G-10 Clock,Timer Calendar 1990/1/1 ~ 2081/12/31

and Timer Timer Events 8 prog/1 month

Back-up One Touch Recording Max Time 5 Hours

OTPB Valid Time No

Timer Back-up (at Power Off Mode) 5 sec.

G-11 Display Indicator No

Indicator Type -

Clock/Counter,CH,Timer Rec,OTR, Play

Rec,FF

(

Cue

)

,Rew

(

Rev

)

,Stop,ATR -

Pause("Rec"Flash) -

Still("Play"Flush) -

Eject(Tape Mark Flash) -

Slow -

WKL,Y.M.D,Start,End -

AFT -

Repeat -

A-DUB -

VCR -

Memory -

Index -

VPS -

PDC -

SP -

LP -

SLP -

AM -

PM -

F1,F2 -

RF Output CH -

G-12 Remote Unit RC-EA

Control Glow in Dark Remocon No

Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 32 Keys

Keys Power Yes

1 Yes

2 Yes

3 Yes

4 Yes

5 Yes

6 Yes

7 Yes

8 Yes

9 Yes

0 Yes

CH Up Yes

CH Down Yes

Input Select Yes

Play Yes

F.Fwd Yes

Rew Yes

Pause/Still Yes

Stop Yes

A3-2

GENERAL SPECIFICATIONS

Rec/OTR Yes

Eject No

Counter Reset Yes

Speed Yes

Timer Rec Yes

TV Monitor No

Quick View No

Program No

Slow Yes

Auto Tracking Yes

Set/Tracking+ Yes

Set/ Tracking - Yes

Menu Yes

Enter Yes

Cancel Yes

Call Yes

TV/VCR Yes

Sleep Timer No

Muting No

Clock/Counter No

Zero Return No

CM Skip No

Audio Select No

G-13 Features Auto Head Cleaning Yes

Auto Tracking Yes

Index Search No

HQ (VHS Standard High Quality) Yes

Auto Power On, Auto Play, Auto Rewind, Auto Eject Yes

Auto Power Off Yes

Forward/Reverse Picture Search Yes

VIDEO PLUS+(SHOWVIEW,G-CODE) No

ATS No

PDC No

VPS No

One Touch Playback No

Picture Control No

Auto Preset No

Channel Lock No

Hotel Lock No

Anti Theft No

Audio Dubbing No

Remort Control Code 1/2 No

SQPB No

CATV Yes

Energy Star Yes

MTS(SAP) No

CM Skip(30sec x 6 Times) No

G-14 Accessories Owner's Manual Language English/Spanish

w/Guarantee Card No

Remote Control Unit Yes

Dew Cation Sheet No

Video Cassette Tape No

Battery No

UM size x pcs -

Safety Tip No

Toll Free Insert Sheet No

Quick Set-Up Sheet No

Information Sheet (Buyer Supply) No

75 Ohm Coaxial Cable Yes(Single shield)

Rod Antenna No

Poles

Terminal

Loop Antenna No

Terminal

U/V Mixer No

DC Car Cord (Center+) No

Guarantee Card Yes

Warning Sheet No

Circuit Diagram No

Antenna Change Plug No

Service Facility List No

Important Safeguard No

Dew/AHC Caution Sheet No

AC Plug Adapter No

Quick Set-up Sheet No

AC Cord No

A3-3

GENERAL SPECIFICATIONS

AV Cord (2Pin-1Pin) No

Registration Card No

PTB Sheet No

Tape Rewinder(Buyer Supply) No

300 ohm to 75 ohm Antenna Adapter No

G-15 Interface Switch Front Power Yes

Play Yes

Pause/Still No

System Select No

One Touch Playback No

Channel Up Yes

Channel Down Yes

F.FWD/Cue Yes

Eject/Stop Yes

Main Power SW No

Volume Up No

Volume Down No

Rew/Rev Yes

Rec/OTR Yes

Rear RF Output SW Yes

Indicator Power Yes

Stand by No

Rec/OTR No

Repeat No

TV/VCR Yes

Rec Yes

T-Rec Yes

Tape In No

Terminals Front Video Input RCA x 1

Audio Input RCA x 1

Other Terminal No

Rear Video Input No

Audio Input No

Video Output RCA x 1

Audio Output RCA x 1

Euro Scart No

DC Jack 12V(Center +) No

VHF/UHF Antenna Input F Type

AC Inlet No

G-16 Set Size Approx. W x D x H (mm) 360 x 229 x 95

G-17 Weight Net (Approx.) 3.2kg(7.1lbs)

Gross (Approx.) 3.8kg(8.4lbs)

G-18 Carton Master Carton No

Content -

Material -

Dimensions W x D x H(mm) -

Description of Origin -

Gift Box Yes

Material Single/White

Dimensions W x D x H(mm) 420x291x160

Design As Per BUYER 's

Description of Origin Yes

Drop Test Natural Dropping At 1Corner / 3Edges / 6Surfaces

Height (cm) 80

Container Stuffing(40' container) 3136Sets

G-19 Cabinet Material Cabinet Front PS 94V2 DECABROM

A3-4

DISASSEMBLY INSTRUCTIONS

1.REMOVAL OF MECHANICAL PARTS

AND P.C. BOARDS

1-1: TOP CABINET, FRONT CABINET AND

OPERATION PCB (Refer to Fig. 1-1)

Remove the 4 screws 1.

Remove the Top Cabinet in the direction of arrow (A).

Disconnect the following connector: (CP651).

Unlock the 7 supports 2.

Remove the Front Cabinet in the direction of arrow (B).

Remove the 3 screws 3and remove the Operation PCB.

1-2: FLAP (Refer to Fig. 1-2)

Open Flap to 90˚ and flex in direction of arrow (A), at

the same time slide in direction of arrow (B).

Then lift in direction of arrow (C).

(A)

(C)

(B)

Flap

Fig. 1-2

B1-1

Fig. 1-1

(A)

Top Cabinet

Operation PCB

Front Cabinet

1-3: DECK CHASSIS (Refer to Fig. 1-3)

Remove the 3 screws 1.

Disconnect the following connectors: (CP1001, CP4001,

CP4002 and CP4003).

Remove the Deck Chassis in the direction of arrow.

1-4: SYSCON PCB AND JACK PLATE (Refer to Fig. 1-4)

Deck Chassis

Fig. 1-3

Remove the screw 1.

Remove the screw 2.

Remove the Syscon PCB in the direction of arrow.

Fig. 1-4

Bottom Plate

Syscon PCB

Bottom Plate

(B)

DISASSEMBLY INSTRUCTIONS

B2-1

2. REMOVAL OF DECK PARTS

2-1: TOP BRACKET (Refer to Fig. 2-1)

Extend the 2 supports 1.

Slide the 2 supports 2and remove the Top Bracket.

2-2: CASSETTE HOLDER ASS'Y (Refer to Fig. 2-2)

Move the Cassette Holder Ass'y to the front side.

Push the Locker R to remove the Cassette Side R.

Remove the Cassette Side L.

Fig. 2-1

Main Chassis

Top Bracket

Main Chassis

Cassette Side L

Cassette Side R Locker R

Fig. 2-2

2-3: CASSETTE SIDE L/R (Refer to Fig. 2-3-A)

Remove the Locker Spring.

Unlock the 4 supports 1and then remove the Cassette

Side L/R.

Unlock the support 2and then remove the Locker R.

Link Ass'y

NOTE

In case of the Locker R installation, check if the two

positions of Fig.2-3-B are correctly locked.

When you install the Cassette Side R, be sure to move

the Locker R after installing.

2-4: LINK UNIT (Refer to Fig. 2-4)

Set the Link Unit to the Eject position.

Unlock the support 1.

Remove the (A) side of the Link Unit first, then remove

the (B) side.

Fig. 2-4

2-5: LINK LEVER/FLAP LEVER (Refer to Fig. 2-5)

Remove the Link Lever.

Remove the Flap Lever.

Fig. 2-5

Fig. 2-3-A

Cassette Side L

Cassette Side R

Locker R

Cassette Holder

Locker Spring

Fig. 2-3-B

Check if these

positions are locked.

(A)

Link Unit

Main Chassis

Link Unit

(B)

Main Chassis

Link Lever

Flap Lever

Cassette Side R

Locker R

NOTE

1. After the installation of the Top Bracket, bend the

support 1so that the Top Bracket is fixed.

DISASSEMBLY INSTRUCTIONS

B2-2

Fig. 2-7-A

Tension Arm Ass'y

2-7: TENSION ASS'Y (Refer to Fig. 2-7-B)

Turn the Pinch Roller Cam clockwise so that the

Tension Holder hook is set to the position of Fig. 2-7-A

to move the Tension Arm Ass'y.

Remove the Tension Spring.

Unlock the 2 supports 1and remove the Tension

Band.

Unlock the support 2and remove the Tension Arm

Ass'y.

Unlock the support 3and remove the Tension

Connect.

Float the hook 4and turn it clockwise then remove the

Tension Holder.

2-6: LOADING MOTOR/WORM (Refer to Fig. 2-6-A)

Remove the screw 1.

Remove the Loading Motor.

Remove the Worm.

Fig. 2-6-A

• Screw Torque: 3 ±0.5kgf•cm

Loading Motor

Main Chassis

Worm

NOTE

1. In case of the Worm installation, check if the value of

the Fig. 2-6-B is correct.

Fig. 2-6-B

19.2 ±0.1mm

Safety surface for pressing

of the insert.

Fig. 2-7-B

Fig. 2-7-D

Tension Band

Tension Spring

Tension Band

Tension Arm Ass'y

Tension Holder

Tension Connect

NOTE

In case of the Tension Band installation, note the

direction of the installation. (Refer to Fig. 2-7-C)

In case of the Tension Band installation, install correctly

as Fig. 2-7-D.

In case of the Tension Connect installation, install as

the circled section of Fig. 2-7-E.

Tension Band

Tension Connect

[OK]

[NG]

Fig. 2-7-E

Tension Connect

Main Chassis

Fig. 2-7-C

Tension Band

Tension Connect

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