Memorex MVT2135B D Service Manual

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SER VICE MANUAL

Design and specifications are subject to change without notice.

MVT2135B SERIES D

COLOR TELEVISION/VIDEO CASSETTE RECORDER

ORIGINAL

MFR’S VERSION A

SERVICING NOTICES ON CHECKING

6. AVOID AN X-RAY1. KEEP THE NOTICES

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.

3. USE THE DESIGNATED PARTS

5. TAKE CARE TO DEAL WITH THE CATHODE-RAY TUBE

In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is secured against implosion. However, when removing it or serving from backward, it is dangerous to give a shock. Take enough care to deal with it.

Safety is secured against an X-ray by considering about the cathode-ray tube and the high voltage peripheral circuit, etc. Therefore, when repairing the high voltage peripheral circuit, use the designated parts and make sure not modify the circuit. Repairing except indicates causes rising of high voltage, and it emits an X-ray from the cathoderay tube.

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 youCr SERVICE MANUAL.

HOW TO ORDER PARTS

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.

(INSULATION CHECK PROCEDURE)

Unplug the plug from the AC outlet. Remove the antenna terminal on TV and turn on the TV. Insulation resistance between the cord plug terminals and the eternal exposure metal [Note 2] should be more than 1M ohm by using the 500V insulation resistance meter

[Note 1].

If the insulation resistance is less than 1M ohm, the inspection repair should be required.

[Note 1]

If you have not the 500V insulation resistance meter, use a Tester.

[Note 2]

External exposure metal: Antenna terminal

Earphone jack

2. AVOID AN ELECTRIC SHOCK

There is a high voltage part inside. Avoid an electric shock while the electric current is flowing.

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.

4. 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.

A1-1

CONTENTS

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 OF ANODE CAP..............................................................................................

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

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

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

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

WHEN REPLACING EEPROM (MEMORY) IC .....................................................................

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

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

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

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

BLOCK DIAGRAMS

TV............................................................................................................................................

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

MICON/OPERATION...............................................................................................................

PRINTED CIRCUIT BOARDS

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

SYSCON/CRT.........................................................................................................................

SCHEMATIC DIAGRAMS

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

MICON.....................................................................................................................................

IN/OUT.....................................................................................................................................

CHROMA/IF.............................................................................................................................

SOUND AMP...........................................................................................................................

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

DEFLECTION..........................................................................................................................

CRT..........................................................................................................................................

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

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

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

MECHANICAL EXPLODED VIEWS...........................................................................................

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

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

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

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

A1-1 A1-1 A2-1 A3-1~A3-4

B1-1 B2-1~B2-5 B3-1 B4-1, B4-2 C1-1, C1-2 C2-1 C3-1, C3-2 C4-1 C5-1 C5-1 D1-1~D1-4 D2-1~D2-5

E-1, E-2 E-3, E-4 E-5, E-6

F-1, F-2 F-3~F-6

G-1, G-2 G-3, G-4 G-5, G-6 G-7, G-8 G-9, G-10 G-11, G-12 G-13, G-14 G-15, G-16 G-17, G-18 G-19, G-20 H-1, H-2 I-1, I-2 I-3, I-4 J1-1 J2-1 J3-1, J3-2

A2-1

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 13 inch / 335.4 mmV

System CRT Type Normal

Deflection 90 degree

Magnetic Field BV/BH +0.45G / +0.18G Color System NTSC Speaker 1Speaker

Position Front

Size 1.5 x 2.5 Inch

Impedance 8 ohm Sound Output MAX 1.5 W

10%(Typical) 1.0 W

G-2 VCR System VHS Player / Recorder

System Video System NTSC

Hi-Fi STEREO No NTSC PB Deck DECK OVD-7

Loading System Front

Motor 3 Heads Video Head 2Head

FM Audio Head No

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 Frame Advance Slow Speed -

G-3 Tuning Broadcasting System US System M

System Tuner and System 1Tuner

Receive CH Destination US(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) 45.75 MHz Frequency Sound(FS) 41.25 MHz

FP-FS 4.5 MHz

Preset CH

Stereo/Dual TV Sound

Tuner Sound Muting Yes

G-4 Signal Video Signal Input Level 1 V p-p/75 ohm

Output Level S/N Ratio (Weighted) 50dB Horizontal Resolution at SP Mode 220Lines

Audio Signal

Input Level

-8dBm/50Kohm

Output Level

S/N Ratio at SP (Weighted) 38dB

Harmonic Distortion at SP (1KHz) Typical

1.5 %

Frequency Response at SP 100Hz - 10kHz

at LP 100Hz - 6kHz

at SLP 100Hz - 4kHz

Hi-Fi Audio Signal Dynamic Range : More than - dB

Wow And Flutter : Less than - %Wrms Channel Separation : More than - dB Harmonic Distortion : Less than - %

G-5 Power Power Source AC 120V,60Hz

DC -

Power Consumption at AC 65 W at 120V 60Hz

at DC Stand by (at AC) 5 W at 120V 60Hz Per Year -

Protector Power Fuse Yes

Dew Sensor

G-6 Regulation Safety UL

Radiation FCC X-Radiation DHHS

G-7 Temperature Operation

5oC

~ +4

0oC

Storage

-2

0oC

~ +

60oC

G-8 Operating Humidity Less then 80% RH G-9 On Screen Menu Yes

A3-1

GENERAL SPECIFICATIONS

Display Menu Type Charactor

Timer Rec Set Yes Channel Setup Yes

TV/CATV Yes Auto CH Memory Yes Add/ Delete Yes Guide CH Set

TV Setup Yes

V-chip Set Yes On/Off Timer Set Yes Picture Yes Audio

Sap On/Off

No Auto Repeat On/Off Yes System Setup Yes

Clock Set Yes Language Yes Auto Clock On/Off Yes Standard Time Yes Daylight Saving Time Yes

Commercial Advance

Marking On/Off

Blueback On/Off

Playback Auto/Manual

Unmarked Tape

No Movie Advance

Go To Movie

Go To Preview

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

Clock / Date Yes CH/AV Yes Tape Counter(Linear Counter) Yes Tape Speed Yes Sleep Time Yes Stereo/Audio Output

Bilingal

SAP

Control Volume Yes Level Bright / Contrast / Sharpness / Color Yes

Tint Yes Bass/Treble/Balance

No Manual Tracking Yes

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

Yes Auto Tracking/Manual Tracking Yes Caption / Text Yes Index

No Muting Yes Hi-Fi

No Repeat Yes Zero Return

No DEW

G-10 OSD Language English French Spanish

OSD Language Setting English

G-11 Clock,Timer Calendar 1990/1/1 ~ 2081/12/31

and Timer Timer Events 8 Program/ 1 Month Back-up One Touch Recording Max Time 5 Hours

OTPB Valid Time

No Sleep Timer Max Time 120

Min

Step 10

Min On/Off Timer Program(On Timer / Off Timer) 1

Program Auto Shut Off No Signal 15

Min

No Operation -

Timer Back-up (at Power Off Mode) 5

Sec

G-12 Remote Unit RC-CG

Control Glow in Dark Remocon Yes

Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 41

Keys Keys Power Yes

1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes

A3-2

GENERAL SPECIFICATIONS

9 Yes 0 Yes CH Up Yes CH Down Yes Volume Up Yes Volume Down Yes Input Select Yes Play Yes F.Fwd Yes Rew Yes Pause/Still Yes Stop Yes Rec/OTR Yes Eject Yes Counter Reset Yes Speed Yes Timer Rec Yes TV Monitor Yes Quick View Yes Program Yes Slow

Auto Tracking Yes Set/Tracking+ Yes Set/Tracking - Yes Menu Yes Enter Yes Cancel Yes Call Yes TV/Caption/Text Yes Sleep Timer Yes Muting Yes Zero Return Yes CM Skip Yes Audio Select

G-13 Features Auto Head Cleaning Yes

Auto Tracking Yes HQ (VHS Standard High Quality) Yes Auto Power On, Auto Play, Auto Rewind, Auto Eject Yes VIDEO PLUS+(SHOWVIEW,G-CODE)

No Auto Clock Yes Forward / Reverse Picture Search Yes Reverse Slow

No One Touch Playback

No Auto CH Memory Yes Closed Caption Yes TV Auto Shut off Function Yes End Call

No Index Search

No SQPB

No CATV Yes CM Skip(30sec x 6 Times) Yes Comb Filter

No TV Monitor Yes Program Extend

No Choke Coil

No Energy Star Yes Protect of FBT Leak Curcuit

No Dirty Head

No V-chip USA V-chip Yes

CANADA V-chip

No Zero Return Yes CM Advance

No Movie Advance

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

w/Guarantee Card

No Remote Control Unit Yes Battery

UM size x pcs -

Rod Antenna Yes

Poles 2 pole Terminal F type w/300 ohm to 75 ohm Antenna Adapter Yes

Loop Antenna

Terminal -

U/V Mixer

No 300 ohm to 75 ohm Antenna Adapter

A3-3

GENERAL SPECIFICATIONS

Antenna Change Plug

No DC Car Cord (Center+)

No AC Plug Adapter

No AC Cord

No AV Cord (2Pin-1Pin)

No Guarantee Card Yes Registration Card

No ESP Card

No Warning Sheet

No Dew/AHC Caution Sheet

No Quick Set-up Sheet

No Circuit Diagram

No Service Facility List

No Important Safeguard

No Informatin Sheet

G-15 Interface Switch Power Yes

Play Yes Pause/Still

System Select

One Touch Playback

Channel Up Yes Channel Down Yes F.FWD/Cue Yes Eject/Stop Yes Main Power SW

Volume Up Yes Volume Down Yes Rew/Rev Yes Rec/OTR Yes Input Select

No Indicator Power

Rec/OTR Red T-Rec Red On Timer

No Key Light up Rec/OTR

One Touch Playback

Play

No Terminals Front Video Input RCA x 1

Audio Input RCA x 1 Other Terminal Head Phone(Stereo & Mono, 3.5mm)

Rear Video Input

Audio Input

Video Output

Audio Output

Euro Scart

Diversity

Ext Speaker W Im

DC Jack 12V(Center +)

VHF/UHF Antenna Input

F Type

AC Inlet

G-16 Set Size Approx. W x D x H (mm) 362 x 370.5 x 382 G-17 Weight Net (Approx.) 11.0

(24.3 lbs)

Gross (Approx.) 12.5

(27.6 lbs)

G-18 Carton Master Carton

Content Material Dimensions W x D x H(mm) Description of Origin -

Gift Box Yes

Material Double/White Dimensions W x D x H(mm) 423 x 447 x 443 Design As per Buyer's Description of Origin Yes

Drop Test Natural Dropping At

1 Corner / 3 Edges / 6 Surfaces

Height (cm) 62

Container Stuffing(40' container) 700

Sets

G-19 Cabinet Material Cabinet Front PS 94V0/DECABROM

Cabinet Rear PS 94V0/DECABROM

A3-4

Front Cabinet

CRT PCB

DISASSEMBLY INSTRUCTIONS

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

1-1: BACK CABINET (Refer to Fig. 1-1)

1-3: TV/VCR BLOCK (Refer to Fig. 1-3)

Fig. 1-3

Remove the 4 screws 1. Remove the screw 2. Remove the AC cord from the AC cord hook 3. Remove the Back Cabinet in the direction of arrow.

Fig. 1-1

Front Cabinet

Back Cabinet

1-2: CRT PCB (Refer to Fig. 1-2) CAUTION:BEFORE REMOVING THE ANODE CAP,

DISCHARGE ELECTRICITY BECAUSE IT CONTAINS HIGH VOLTAGE. BEFORE ATTEMPTING TO REMOVE OR REPAIR ANY PCB, UNPLUG THE POWER CORD FROM THE AC SOURCE.

Fig. 1-2

Remove the 2 screws 1. Disconnect the following connectors: (CP757, CP353, CP401 and CP502). Unlock the support 2. Remove the TV/VCR Block in the direction of arrow.

Remove the Anode Cap. (Refer to REMOVAL OF ANODE CAP) Disconnect the following connectors: (CP801 and CP851). Remove the CRT PCB in the direction of arrow.

UP TO RELEASE

TV/VCR Block

1-4:DECK CHASSIS AND SYSCON PCB

(Refer to Fig. 1-4)

Remove the screw 1. Remove the screw 2. Remove the screw 3. Remove the 3 screws 4. Disconnect the following connectors: (CP1004, CP1005, CP1006, CP4001, CP4002 and CP4003). Remove the Deck Chassis and Deck Shield Plate in the direction of arrow (A). Remove the screw 5. Remove the Syscon PCB in the direction of arrow (B).

B1-1

Front Cabinet

Deck Chassis

Deck Shield Plate

(A)

Syscon PCB

Deck Holder

Fig. 1-4

(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 2 and 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 1 and then remove the Cassette Side L/R. Unlock the support 2 and then remove the Locker R.

Link Ass'y

NOTE

1.2.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 1 so that the Top Bracket is fixed.

DISASSEMBLY INSTRUCTIONS

B2-2

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 1 and remove the Tension Band. Unlock the support 2 and remove the Tension Arm Ass'y. Unlock the support 3 and remove the Tension Connect. Float the hook 4 and 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-D

Tension Band

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

Fig. 2-7-A

Tension Arm Ass'y

Fig. 2-7-B

Tension Spring

Tension Band

Tension Arm Ass'y

Tension Holder

Tension Connect

DISASSEMBLY INSTRUCTIONS

B2-3

Fig. 2-9-B

Big Hole (S Reel)

Small Hole (T Reel)

Fig. 2-9-C

Idler Arm Ass'y

[OK]

[NG]

Clutch Gear

Idler Arm Ass'y

Clutch Gear

Fig. 2-8-B

T Brake Band

NOTE

1. In case of the T Brake Band installation, install correctly as Fig. 2-8-B.

T Brake Arm

[OK]

[NG]

T Brake Band

T Brake Arm

2-9: S REEL/T REEL/IDLER ARM ASS'Y/IDLER GEAR

(Refer to Fig. 2-9-A)

Remove the S Reel and T Reel. Remove the 2 Polyslider Washers 1. Remove the Idler Arm Ass'y and Idler Gear.

NOTE

Take care not to damage the gears of the S Reel and T Reel. The Polyslider Washer may be remained on the back of the reel. Take care not to damage the shaft. Do not touch the section "A" of S Reel and T Reel. (Use gloves.) (Refer to Fig. 2-9-A) Do not adhere the stains on it. When you install the reel, clean the shaft and grease it (MG-33). (If you do not grease, noise may be heard in FF/REW mode.) After installing the reel, adjust the height of the reel.

(Refer to MECHANICAL ADJUSTMENT)

Fig. 2-9-A

S Reel

(A) T Reel

(A)

Idler Arm Ass'y

Idler Gear

NOTE

1.2.In case of the S Reel and T Reel installation, check if the correct parts are installed. (Refer to Fig. 2-9-B) In case of the Idler Arm Ass'y installation, install correctly as Fig. 2-9-C.

2-8: T BRAKE ARM/T BRAKE BAND (Refer to Fig. 2-8-A)

Remove the T Brake Spring. Turn the T Brake Arm clockwise and bend the hook section to remove it. Unlock the 2 supports 1 and remove the T Brake Band.

T Brake Band

Hook section

T Brake Spring

T Brake Arm

Fig. 2-8-A

DISASSEMBLY INSTRUCTIONS

B2-4

A/C Head

A/C Head Spring

(3)(1)

(2)

A/C Head Base

Spring Position

Fig. 2-11-B

2-12: FE HEAD (RECORDER ONLY) (Refer to Fig. 2-12)

Remove the screw 1. Remove the FE Head.

FE Head

• Screw Torque: 5 ± 0.5kgf•cm

• The FE Head is not installed on the Video Cassette Player.

Fig. 2-11-A

• Screw Torque: 5 ± 0.5kgf•cm (Screw 1)

Fig. 2-12

2-11: A/C HEAD (Refer to Fig. 2-11-A)

Remove the screw 1. Remove the A/C Head Base. Remove the 3 screws 2. Remove the A/C Head and A/C Head Spring.

NOTE

Do not touch the A/C Head. (Use gloves.) When you install the A/C Head Spring, install as shown in Fig. 2-11-B. When you install the A/C Head, tighten the screw (1) first, then tighten the screw (2), finally tighten the screw (3).

2-10: CASSETTE OPENER/PINCH ROLLER BLOCK/

P5 ARM ASS'Y (Refer to Fig. 2-10-A)

Unlock the support 1 and remove the Cassette Opener. Remove the Pinch Roller Block and P5 Arm Ass'y.

Fig. 2-10-A

Cassette Opener

P5 Arm Ass'y

Pinch Roller Block

Main Chassis

NOTE

Do not touch the Pinch Roller. (Use gloves.) In case of the Pinch Roller Block and the Pinch Roller Cam installation, install correctly as Fig. 2-10-B.

Fig. 2-10-B

Can be seen the hole of the Main Cam.

Can be seen the hole of the Pinch Roller Cam.

P5 Arm Ass'y

Pinch Roller Block

DISASSEMBLY INSTRUCTIONS

B2-5

Fig. 2-15-A

NOTE

In case of the Pinch Roller Cam and Main Cam installation, install them as the circled section of Fig. 215-B so that the each markers are met. (Refer to Fig.

2-15-B)

Fig. 2-15-B

2-15:

Remove the E-Ring 1, then remove the Main Cam. Remove the E-Ring 2, then remove the Pinch Roller Cam and Joint Gear.

MAIN CAM/PINCH ROLLER CAM/JOINT GEAR (Refer to Fig. 2-15-A)

Main Cam

Pinch Roller Cam

Joint Gear

Pinch Roller Cam

Main Cam

Marker

2-16: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-16-A)

1.2.Remove the E-Ring 1 and remove the Main Loading Gear. Remove the Main Rod, Tension Lever, Loading Arm S Ass'y and Loading Arm T Ass'y.

Main Rod

Main Loading Gear

Tension Lever

Loading Arm T Ass'y

Loading Arm S Ass'y

Fig. 2-16-A

2-13:AHC ASS'Y/CYLINDER UNIT ASS'Y

(Refer to Fig. 2-13)

Unlock the support 1 and remove the AHC Ass'y. Disconnect the following connector: (CD2001) Remove the 3 screws 2. Remove the Cylinder Unit Ass'y.

When you install the Cylinder Unit Ass'y, tighten the screws from (1) to (3) in order while pulling the Ass'y toward the left front direction.

NOTE

Fig. 2-13

AHC Ass'y

Cylinder Unit Ass'y

• Screw Torque: 3 ± 0.5kgf•cm

(1)

(3)

(2)

2-14: CAPSTAN DD UNIT (Refer to Fig. 2-14)

Remove the Capstan Belt. Remove the 3 screws 1. Remove the Capstan DD Unit.

Fig. 2-14

• Screw Torque: 4 ± 0.5kgf•cm

Capstan DD Unit

Capstan Belt

DISASSEMBLY INSTRUCTIONS

B2-6

2-18:

Remove the P4 Cap. Unlock the support 1 and remove the Cassette Guide Post. Remove the Inclined Base S Unit and Inclined Base T Unit.

Fig. 2-18-A

CASSETTE GUIDE POST/INCLINED BASE S/T UNIT/P4 CAP (Refer to Fig. 2-18-A)

P4 Cap

Cassette Guide Post

Inclined Base T Unit

Inclined Base S Unit

NOTE

Do not touch the roller of Guide Roller. In case of the P4 Cap installation, install it with parallel for "A" and "B" of Fig. 2-18-B. In case of the Cassette Guide Post installation, install correctly as the circled section of Fig. 2-18-C.

"A"

[OK]

[NG]

"B"

P4 Cap

Cassette Opener

Fig. 2-18-B

Fig. 2-18-C

Cassette Guide Post

2-17:

Remove the Polyslider Washer 1. Remove the Clutch Ass'y and Ring Spring. Remove the Clutch Lever. Remove the Coupling Gear, Coupling Spring and Clutch Gear.

Fig. 2-17-A

NOTE

When you install the Loading Arm S Ass'y, Loading Arm T Ass'y and Main Loading Gear, align each marker.

(Refer to Fig. 2-16-B)

Fig. 2-16-B

Loading Arm T Ass'y

Main Loading Gear

Marker

Loading Arm S Ass'y

Clutch Ass'y

Coupling Gear

Clutch Lever

Ring Spring

Coupling Spring

Clutch Gear

CLUTCH ASS'Y/RING SPRING/CLUTCH LEVER/ CLUTCH GEAR (Refer to Fig. 2-17-A)

NOTE

In case of the Clutch Ass'y installation, install it with inserting the spring of the Clutch Ass'y into the dent of the Coupling Gear. (Refer to Fig. 2-17-B)

Clutch Ass'y

Fig. 2-17-B

Coupling Gear

3. REMOVAL OF ANODE CAP

Read the following NOTED items before starting work.

After turning the power off there might still be a potential voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's potential voltage. Do not use pliers to loosen or tighten the Anode Cap terminal, this may cause the spring to be damaged.

REMOVAL

1. Follow the steps as follows to discharge the Anode Cap.

(Refer to Fig. 3-1.)

Connect one end of an Alligator Clip to the metal part of a flat-blade screwdriver and the other end to ground. While holding the plastic part of the insulated Screwdriver, touch the support of the Anode with the tip of the Screwdriver. A cracking noise will be heard as the voltage is discharged.

Flip up the sides of the Rubber Cap in the direction of the arrow and remove one side of the support.

(Refer to Fig. 3-2.)

GND on the CRT

Screwdriver

Alligator Clip

Support

CRT

GND on the CRT

Rubber Cap

CRT

Support

Fig. 3-1

Fig. 3-2

3. After one side is removed, pull in the opposite direction to remove the other.

NOTE

Take care not to damage the Rubber Cap.

INSTALLATION

1. Clean the spot where the cap was located with a small amount of alcohol. (Refer to Fig. 3-3.)

Location of Anode Cap

NOTE

Confirm that there is no dirt, dust, etc. at the spot where the cap was located.

2.3.Arrange the wire of the Anode Cap and make sure the wire is not twisted. Turn over the Rubber Cap. (Refer to Fig. 3-4.)

4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 3-5.

5.6.Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts.

CRT

Support

DISASSEMBLY INSTRUCTIONS

Fig. 3-3

Fig. 3-4

Fig. 3-5

B3-1

B4-1

Masking Tape (Cotton Tape)

DISASSEMBLY INSTRUCTIONS

REMOVAL

Put the Masking Tape (cotton tape) around the Flat Package IC to protect other parts from any damage.

(Refer to Fig. 4-1.)

Fig. 4-1

NOTE

REMOVAL AND INSTALLATION OF FLAT PACKAGE IC

Some ICs on the PCB are affixed with glue, so be careful not to break or damage the foil of each IC leads or solder lands under the IC when removing it.

NOTE

Masking is carried out on all the parts located within 10 mm distance from IC leads.

Blower type IC desoldering machine

Heat the IC leads using a blower type IC desoldering machine. (Refer to Fig. 4-2.)

Fig. 4-2

NOTE

Do not add the rotating and the back and forth directions force on the IC, until IC can move back and forth easily after desoldering the IC leads completely.

When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 4-3.)

Blower type IC desoldering machine

Fig. 4-3

Tweezers

Peel off the Masking Tape.4. Absorb the solder left on the pattern using the Braided

Shield Wire. (Refer to Fig. 4-4.)

NOTE

Do not move the Braided Shield Wire in the vertical direction towards the IC pattern.

Braided Shield Wire

Soldering Iron

Fig. 4-4

IC pattern

B4-2

DISASSEMBLY INSTRUCTIONS

Supply soldering from upper position to lower position

Supply the solder from the upper position of IC leads sliding to the lower position of the IC leads.

(Refer to Fig. 4-6.)

Fig. 4-6

Soldering IronSolder

Absorb the solder left on the lead using the Braided Shield Wire. (Refer to Fig. 4-7.)

Fig. 4-7

Soldering Iron

Braided Shield Wire

NOTE

Do not absorb the solder to excess.

When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thintip Soldering Iron. (Refer to Fig. 4-8.)

Fig. 4-8

Thin-tip Soldering Iron

NOTE

When the IC leads are bent during soldering and/or repairing, do not repair the bending of leads. If the bending of leads are repaired, the pattern may be damaged. So, be always sure to replace the IC in this case.

Finally, confirm the soldering status on four sides of the IC using a magnifying glass. Confirm that no abnormality is found on the soldering position and installation position of the parts around the IC. If some abnormality is found, correct by resoldering.

Solder temporarily

Soldering Iron

INSTALLATION

Take care of the polarity of new IC and then install the new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

(Refer to Fig. 4-5.)

Fig. 4-5

Solder temporarily

KEY TO ABBREVIATIONS

A/C ACC AE AFC AFT AFT DET AGC AMP ANT A.PB APC ASS'Y AT AUTO A/V BGP BOT BPF BRAKE SOL BUFF B/W C CASE CAP CARR CH CLK CLOCK (SY-SE) COMB CONV CPM CTL CYL CYL-M CYL SENS DATA (SY-CE) dB DC DD Unit DEMOD DET DEV E EF EMPH ENC ENV EOT EQ EXT F FBC FE FF FG FL SW FM FSC FWD GEN GND H.P.F

: : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :

Audio/Control Automatic Color Control Audio Erase Automatic Frequency Control Automatic Fine Tuning Automatic Fine Tuning Detect Automatic Gain Control Amplifier Antenna Audio Playback Automatic Phase Control Assembly All Time Automatic Audio/Video Burst Gate Pulse Beginning of Tape Bandpass Filter Brake Solenoid Buffer Black and White Capacitance, Collector Cassette Capstan Carrier Channel Clock Clock (Syscon to Servo) Combination, Comb Filter Converter Capstan Motor Control Cylinder Cylinder-Motor Cylinder-Sensor Data (Syscon to Servo) Decibel Direct Current Direct Drive Motor Unit Demodulator Detector Deviation Emitter Emitter Follower Emphasis Encoder Envelope End of Tape Equalizer External Fuse Feed Back Clamp Full Erase Fast Forward, Flipflop Frequency Generator Front Loading Switch Frequency Modulation Frequency Sub Carrier Forward Generator Ground High Pass Filter

K L

H.SW Hz IC IF IND INV KIL L LED LIMIT AMP LM, LDM LP L.P.F LUMI. M MAX MINI MIX MM MOD MPX MS SW NC NR OSC OPE PB PB CTL PB-C PB-Y PCB P. CON PD PG P-P R REC REC-C REC-Y REEL BRK REEL S REF REG REW REV, RVS RF RMC RY S. CLK S. COM S. DATA SEG SEL SENS SER SI SIF SO SOL SP STB SW

: : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :

Head Switch Hertz Integrated Circuit Intermediate Frequency Indicator Inverter Killer Left Light Emitting Diode Limiter Amplifier Loading Motor Long Play Low Pass Filter Luminance Motor Maximum Minimum Mixer, mixing Monostable Multivibrator Modulator, Modulation Multiplexer, Multiplex Mecha State Switch Non Connection Noise Reduction Oscillator Operation Playback Playback Control Playback-Chrominance Playback-Luminance Printed Circuit Board Power Control Phase Detector Pulse Generator Peak-to Peak Right Recording Recording-Chrominance Recording-Luminance Reel Brake Reel Sensor Reference Regulated, Regulator Rewind Reverse Radio Frequency Remote Control Relay Serial Clock Sensor Common Serial Data Segment Select, Selector Sensor Search Mode Serial Input Sound Intermediate Frequency Serial Output Solenoid Standard Play Serial Strobe Switch

C1-1

KEY TO ABBREVIATIONS

U V

X Y

SYNC SYNC SEP TR TRAC TRICK PB TP UNREG V VCO VIF VP V.PB VR V.REC VSF VSR VSS V-SYNC VT X'TAL Y/C

: : : : : : : : : : : : : : : : : : : : :

Synchronization Sync Separator, Separation Transistor Tracking Trick Playback Test Point Unregulated Volt Voltage Controlled Oscillator Video Intermediate Frequency Vertical Pulse, Voltage Display Video Playback Variable Resistor Video Recording Visual Search Fast Forward Visual Search Rewind Voltage Super Source Vertical-Synchronization Voltage Tuning Crystal Luminance/Chrominance

C1-2

C2-1

SERVICE MODE LIST

This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter SERVICE MODE, unplug AC cord till lost actual clock time. Then press and hold Vol (-) button of main unit and

remocon key simultaneously. The both pressing of set key and remote control key will not be possible if clock has been set. To reset clock, either unplug

AC cord and allow at least 5 seconds before Power On.

Set Key Remocon Key Operations

VOL. (-) MIN

Releasing of V-CHIP PASSWORD.

Horizontal position adjustment of OSD. NOTE: Also can be adjusted by using the Adjustment MENU. Refer to the "ELECTRICAL ADJUSTMENT" (OSD HORIZONTAL).

VOL. (-) MIN

Adjust the PG SHIFTER automatically. Refer to the "ELECTRICAL ADJUSTMENT" (PG SHIFTER).

VOL. (-) MIN 4

Adjust the PG SHIFTER manually. Refer to the "ELECTRICAL ADJUSTMENT" (PG SHIFTER).

VOL. (-) MIN

Adjusting of the Tracking to the center position. NOTE: Also can be adjusted by pressing the ATR button for more than 2 seconds during PLAY.

VOL. (-) MIN

POWER ON total hours and PLAY/REC total hours are displayed on the screen. Refer to the "PREVENTIVE CHECKS AND SERVICE INTERVALS" (CONFIRMATION OF HOURS USED).

Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".

VOL. (-) MIN

VOL. (-) MIN 1

Initialization of the factory. NOTE: Do not use this for the normal servicing.

VOL. (-) MIN 9

Display of the Adjustment MENU on the screen. Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).

VOL. (-) MIN 8

Writing of EEPROM initial data. NOTE: Do not use this for the normal servicing.

Method Operations

Adjusting of the Tracking to the center position. Refer to the "MECHANICAL ADJUSTMENT" (GUIDE ROLLER) and "ELECTRICAL ADJUSTMENT" (PG SHIFTER).

Press the ATR button on the remote control for more than 2 seconds during PLAY.

Make the short circuit between the test point of SERVICE and the GND.

The EOT/BOT/Reel sensor do not work at this moment. Refer to the "PREPARATION FOR SERVICING"

C3-1

PREVENTIVE CHECKS AND SERVICE INTERVALS

The following standard table depends on environmental conditions and usage. Unless maintenance is properly carried out, the following service intervals may be quite shortened as harmful effects may be had on other parts. Also, long term storage or misuse may cause transformation and aging of rubber parts.

Parts Name

Audio Control Head

Notes

Time

500

hours

1,000 hours

1,500 hours

2,000 hours

3,000 hours

: Clean : Replace

Full Erase Head

(Recorder only)

Capstan Belt

Pinch Roller

Capstan DD Unit

Loading Motor

Tension Band Capstan Shaft

Tape Running Guide Post

Cylinder Unit

Clean those parts in contact with the tape.

Clean the rubber, and parts which the rubber touches.

Replace when rolling becomes abnormal.

Clean the Head

CONFIRMATION OF HOURS USED

POWER ON total hours and PLAY/REC total hours can be checked on the screen. Total hours are displayed in 16 system of notation.

NOTE:The confirmation of using hours will not be possible if clock has been set. To reset clock, either unplug

AC cord and allow at least 5 seconds before Power On.

Set the VOLUME to minimum. While holding down VOLUME button on front cabinet, press key 6 on remote control simultaneously. After the confirmation of using hours, turn off the power.

INIT 00 83

0010 0003

POWER ON PLAY/REC

Initial setting content of MEMORY IC.

POWER ON total hours. PLAY/REC total hours.

(16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) + (ones digit value)

CLEANING

NOTE

After cleaning the heads with isopropyl alcohol, do not run a tape until the heads dry completely. If the heads are not completely dry and alcohol gets on the tape, damage may occur.

1. AUDIO CONTROL HEAD

Clean the Audio Control Head with the cotton stick soaked by alcohol. Clean the full erase head in the same manner. (Refer to the figure below.)

2. TAPE RUNNING SYSTEM

When cleaning the tape transport system, use the gauze moistened with isopropyl alcohol.

3. CYLINDER

Wrap a piece of chamois around your finger. Dip it in isopropyl alcohol. Hold it to the cylinder head softly. Turn the cylinder head counterclockwise to clean it (in the direction of the arrow). (Refer to the figure below.)

NOTE

Do not exert force against the cylinder head. Do not move the chamois upward or downward on the head. Use the chamois one by one.

Cylinder Head

Audio Control Head

C3-2

PREVENTIVE CHECKS AND SERVICE INTERVALS

WHEN REPLACING EEPROM (MEMORY) IC

If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1.

NOTE:Initial Data setting will not be possible if clock has been set. To reset clock, either unplug AC cord and allow

at least 5 seconds before Power On.

C4-1

88 0A 62 63 43 14 34 09 51 38

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9

+B +C +D +E +FINI

B2 92 93 00 00 00 15 08 00 06 29 01 17 10 60 32 3A DA D7 28 29 2A 2C 2E 30 32 34 36 38 43 45 46 47 48 49 4A 4B 4C

30 66 00 40 00 1000

A9 0F 94 3E 06 04 20 10 15 20 25 26 27 30 3A 3C 3E 40 41 42 40 44 4D 4E 4F 50 51 52

53 55 56 57 58 59 5A 5B 5C 63 64 66 69 6D 74 79 7C 7E 7F

5D 5E 5F 60 61 62

60 --- --- --- --- --- ---

8. The unit will now have the correct DATA for the new MEMORY IC.

Table 1

Fig. 1

ADDRESS is now selected and should "blink". Using the PLAY or STOP button on the remote, step through the ADDRESS until required ADDRESS to be changed is reached. Press ENTER to select DATA. When DATA is selected, it will "blink". Again, step through the DATA using PLAY or STOP until required DATA value has been selected. Pressing ENTER will take you back to ADDRESS for further selection if necessary. Repeat steps 3 to 6 until all data has been checked. When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.

Enter DATA SET mode by setting VOLUME to minimum. While holding down VOLUME button on front cabinet, press key 6 on remote control simultaneously. ADDRESS and DATA should appear as FIG 1.

INIT 00 83

0010 0003

POWER ON PLAY/REC

ADDRESS DATA

(For 2 heads model)

VHS Alignment Tape JG001 JG001A JG001Q JG001T

SERVICING FIXTURES AND TOOLS

JG100A Torque Tape

(VHT-063)

JG024AJG022 Master PlaneJG153 X Value Adjustment

Screwdriver

JG005 Post Adjustment

Screwdriver Part No. SV-TG0-030-000 (small)

JG002B JG002E

JG002F

Adapter Dial Torque Gauge (10~90gf•cm) (60~600gf•cm)

(For 4 heads model)

VHS Alignment Tape JG001B JG001I JG001P JG001S

(VN S-LI6 ) (VN S-CO1 ) (VN S-LI6 H) (VN S-X6 )

Reel Disk Height Adjustment Jig

C5-1

JG154 Cable

Tentelometer

Remarks

Part No.

APJG001000

Ref. No.

JG001Q

JG001T JG001B

JG001I JG001P JG001S JG002B JG002E JG002F

JG005 JG153

JG001

JG001A

APJG022000

APJG001A00

APJG001Q00

JG100A

JG154

JG024A

JG022

VHS Alignment Tape (For 2 heads model)

APJG001T00 APJG001B00

APJG001I00 APJG001P00 APJG001S00 APJG002B00 APJG002E00 APJG002F00 APJG005000 APJG153000

APJG024A00 APJG100A00 APJG154000

Parts Name

VHS Alignment Tape (For 2 heads model) VHS Alignment Tape (For 2 heads model) VHS Alignment Tape (For 2 heads model) VHS Alignment Tape (For 4 heads model) VHS Alignment Tape (For 4 heads model) VHS Alignment Tape (For 4 heads model) VHS Alignment Tape (For 4 heads model) Adapter Dial Torque Gauge (10~90gf•cm) Dial Torque Gauge (60~600gf•cm) Post Adjustment Screwdriver X Value Adjustment Screwdriver Master Plane Reel Disk Height Adjustment Jig Torque Tape (VHT-063) Cable

Monoscope, 6KHz Color Bar, 1KHz Hi-Fi Audio X Value Adjustment Monoscope, 6KHz Color Bar, 1KHz Hi-Fi Audio X Value Adjustment VSR Torque, Brake Torque (S Reel/T Reel Ass'y) Brake Torque (T Reel Ass'y) VSR Torque, Brake Torque (S Reel) Guide Roller Adjustment X Value Adjustment Reel Disk Height Adjustment Reel Disk Height Adjustment Playback Torque, Back Tension Torque During Playback Used to connect the test point of SERVICE and GROUND

PREPARATION FOR SERVICING

How to use the Servicing Fixture

Unplug the connector CP757 and CP353, then remove the TV/VCR Block from the set. Remove the Operation PCB from the set, then connect it with the Syscon PCB. If necessary, connect CP353. (Front A/V Jack Input Terminal) Short circuit between TP1001 and Ground with the cable JG154.

(Refer to MAJOR COMPONENTS LOCATION GUIDE)

The EOT, BOT and Reel Sensor do not work at this moment. At that time, the STOP/EJECT button is available to insert and eject the Cassette Tape.

D1-1

MECHANICAL ADJUSTMENTS

1. CONFIRMATION AND ADJUSTMENT

Read the following NOTES before starting work.

••Place an object which weighs between 450g~500g on the Cassette Tape to keep it steady when you want to make the tape run without the Cassette Holder. (Do not place an object which weighs over 500g.) When you activate the deck without the Cassette Holder, short circuit between TP1001 and GND. (Refer

to ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE) In this condition the BOT/EOT/Reel Sensor will

not function.

CONFIRMATION AND ADJUSTMENT OF REEL DISK HEIGHT

1-1:

Turn on the power and set to the STOP mode. Set the master plane (JG022) and reel disk height adjustment jig (JG024A) on the mechanism framework, taking care not to scratch the drum, as shown in Fig. 1- 1-A. While turning the reel and confirm the following points. Check if the surface "A" of reel disk is lower than the surface "B" of reel disk height adjustment jig (JG024A) and is higher than the surface "C". If it is not passed, place the height adjustment washers and adjust to 10(+2, -0)mm. Adjust the other reel in the same way.

Fig. 1-2-B

1-3: CONFIRMATION OF PLAYBACK TORQUE AND

BACK TENSION TORQUE DURING PLAYBACK

Load a video tape (T-120) recorded in standard speed mode. Set the unit to the PLAY mode. Install the tentelometer as shown in Fig. 1-3. Confirm that the meter indicates 20 ± 2gf in the beginning of playback.

• USING A CASSETTE TYPE TORQUE TAPE (JG100A)

After confirmation and adjustment of Tension Post position (Refer to item 1-2), load the cassette type torque tape (JG100A) and set to the PLAY mode. Confirm that the right meter of the torque tape indicates 50~90gf•cm during playback in SP mode. Confirm that the left meter of the torque tape indicates 25~40gf•cm during playback in SP mode.

Tentelometer

Video Tape

Guide Roller

P1 Post

Fig. 1-3

1-2: CONFIRMATION AND ADJUSTMENT OF TENSION

POST POSITION

Set to the PLAY mode. Adjust the adjusting parts for the Tension Arm position so that the Tension Arm top is within the standard line of Main Chassis. While turning the S Reel clockwise, confirm that the edge of the Tension Arm is located in the position described above.

Fig. 1-2-A

Standard line of Main Chassis

Tension Arm

0.5mm (Adjusting range)

Reel Disk Height Adjustment Jig (JG024A)

Fig. 1-1-A

Reel Disk

Height Adjustment Washer

2.6x4.7xT0.13

2.6X4.7xT0.25

(B)

(C)

Master Plane (JG022)

Fig. 1-1-B

(A)

10(+0.2, -0)mm

Master Plane (JG022)

Reel Disk Height Adjustment Jig (JG024A)

Adjusting parts for the Tension Arm position

Bend

Tension Band

The Tension Arm top will move to the outside direction of the Main Chassis.

The Tension Arm top will move to the inside direction of the Main Chassis.

S Reel/Tension Band/Tension Connect/Tension Arm Ass'y T Reel/T Brake Band//T Brake Spring/T Brake Arm

D1-2

MECHANICAL ADJUSTMENTS

1-4: CONFIRMATION OF VSR TORQUE

Install the Torque Gauge (JG002F) and Adapter (JG002B) on the S Reel. Set to the Picture Search (Rewind) mode.

(Refer to Fig.1-4-B)

Then, confirm that it indicates 120~180gf•cm.

NOTE

If the torque is out of the range, replace the following parts.

Check item

1-4 1-5

Replacement Part

Idler Ass'y/Clutch Ass'y

S Reel side: T Reel side:

2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM

Tape Running Mechanism is adjusted precisely at the factory. Adjustment is not necessary as usual. When you replace the parts of the tape running mechanism because of long term usage or failure, the confirmation and adjustment are necessary.

2-1: GUIDE ROLLER

Playback the VHS Alignment Tape (JG001 or JG001B). (Refer to SERVICING FIXTURE AND TOOLS)

Connect CH-1 of the oscilloscope to TP4001 (Envelope) and CH-2 to TP1002 (SW Pulse). Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. Trigger with SW Pulse and observe the envelope. (Refer

to Fig. 2-1-A)

When observing the envelope, adjust the Adjusting Driver (JG005) slightly until the envelope will be flat. Even if you press the Tracking Button, adjust so that flatness is not moved so much. Adjust so that the A : B ratio is better than 3 : 2 as shown in Fig. 2-1-B, even if you press the Tracking Button to move the envelope (The envelope waveform will begin to decrease when you press the Tracking Button). Adjust the PG shifter during playback.

(Refer to the ELECTRICAL ADJUSTMENTS)

NOTE

After adjustment, confirm and adjust A/C head.

(Refer to item 2-2)

CH-2 SW Pulse (TP1002)

CH-1 Track

CH-2 Track

CH-1 Envelope (TP4001)

Fig. 2-1-A

Entrance Exit

Max

A : B ≥ 3 : 2

Max

Fig. 2-1-B

NOTE

Install the Torque Gauge on the reel disk firmly. Press the REW button to turn the reel disk.

1-5: CONFIRMATION OF REEL BRAKE TORQUE

(S Reel Brake) (Refer to Fig. 1-4-B)

Once set to the Fast Forward mode then set to the Stop mode. While, unplug the AC cord when the Pinch Roller Block is on the position of Fig. 1-4-A. Move the Idler Ass'y from the S Reel. Install the Torque Gauge (JG002F) and Adapter

(JG002B) on the S Reel. Turn the Torque Gauge (JG002F) clockwise.

Then, confirm that it indicates 60~100gf•cm.

4. (T Reel Brake) (Refer to Fig. 1-4-B)

Once set to the Fast Forward mode then set to the Stop mode. While, unplug the AC cord when the Pinch Roller Block is on the position of Fig. 1-4-A. Move the Idler Ass'y from the T Reel. Install the Torque Gauge (JG002E) and Adapter

(JG002B) on the T reel. Turn the Torque Gauge (JG002E) counterclockwise.

Then, confirm that it indicates 30~50gf•cm.

Torque Gauge/Adapter (JG002F/JG002B)

T Reel

S Reel

Torque Gauge/Adapter (JG002E/JG002B)

Fig. 1-4-A

The position at FF mode.

The position at STOP mode.

Cassette Opener

Pinch Roller Block

Capstan DD Unit

Cassette Holder Ass'y

Stop at this position.

Fig. 1-4-B

D1-3

MECHANICAL ADJUSTMENTS

2-3:2-2:

When the Tape Running Mechanism does not work well, adjust the following items.

CONFIRMATION AND ADJUSTMENT OF AUDIO/ CONTROL HEAD

4. When the height is not correct, turn the screw 3 to

adjust the height. Then, adjust the 1~3 again.

Playback the VHS Alignment Tape (JG001 or JG001B) .

(Refer to SERVICING FIXTURE AND TOOLS)

Confirm that the reflected picture of stamp mark is appeared on the tape prior to P4 Post as shown in Fig. 2-2-A. a)

Turn the screw 2 to set the audio level to maximum. Confirm that the bottom of the Audio/ Control Head and the bottom of the tape is shown in Fig. 2-2-C. c)

When the reflected picture is distorted, turn the screw 1 clockwise until the distortion is disappeared. When the reflected picture is not distorted, turn the screw 1 counterclockwise until little distortion is appeared, then adjust the a).

P4 Post

Fig. 2-2-A

Audio/Control Head

Fig. 2-2-B

Audio/Control Head

Fig. 2-2-C

TAPE RUNNING ADJUSTMENT (X VALUE ADJUSTMENT)

Confirm and adjust the height of the Reel Disk.

(Refer to item 1-1)

Confirm and adjust the position of the Tension Post.

(Refer to item 1-2)

Adjust the Guide Roller. (Refer to item 2-1) Confirm and adjust the Audio/Control Head.

(Refer to item 2-2) Connect CH-1 of the oscilloscope to TP4001, CH-2 to TP1002 and CH-3 to HOT side of Audio Out Jack. Playback the VHS Alignment Tape (JG001S or JG001T). (Refer to SERVICING FIXTURE AND TOOLS)

Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. Set the X Value adjustment driver (JG153) to the 4 of Fig. 2-2-B. Adjust X value so that the envelope waveform output becomes maximum. Check if the relation between Audio and Envelope waveform becomes (1) or (2) of Fig. 2-3.

Audio/Control Head

Reflected picture of Stamp Mark

Stamp Mark

Tape

0.25±0.05mm

Envelope

CH-3 Audio

(1)

(2)

Fig. 2-3

2-4: CONFIRM HI-FI AUDIO (Hi-Fi model only)

Connect CH-1 of the oscilloscope to TP1002 and CH-2 to the Hi-Fi Audio Out Jack. Playback the VHS Alignment Tape (JG001P or JG001Q).

(Refer to SERVICING FIXTURE AND TOOLS)

Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. Press the Tracking Up button and count number of steps which the audio output is changed from Hi-Fi (10KHz) to MONO (6KHz). Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. Press the Tracking Down button and count number of steps which the audio output is changed from Hi-Fi (10KHz) to MONO (6KHz). If the difference are more than 3 steps, set the X Value adjustment driver (JG153) to 4 of Fig. 2-2-B. Change the X Value and adjust it so that the value becomes within 2 steps.

D1-4

MECHANICAL ADJUSTMENTS

3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE

8910

1. Tension Connect

2. Tension Arm

3. Guide Roller

4. Audio/Control Head

5. X value adjustment driver hole

10.

P4 Post T Brake Spring T Reel S Reel Adjusting parts for the Tension Arm position

D2-1

ELECTRICAL ADJUSTMENTS

1. BEFORE MAKING ELECTRICAL

ADJUSTMENTS

Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.

CAUTION

•

Use an isolation transformer when performing any service on this chassis. Before removing the anode cap, discharge electricity because it contains high voltage. When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use only specified silicon grease (YG6260M). Remove all old silicon before applying new silicon.

(VCR SECTION)

2-1: PG SHIFTER

Connect CH-1 on the oscilloscope to TP1002 and CH-2 to pin 4 of CP1003. Playback the alignment tape. (JG001A) Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. Press the VOL. DOWN button on the set and the channel button (3) on the remote control simultaneously until the indicator REC disappears. If the indicator REC disappears, adjustment is completed.

(If the above adjustments doesn't work well:)

Press the VOL. DOWN button on the set and the channel button (3) on the remote control simultaneously until the indicator REC disappears. When the REC indicator is blinking, press both VOL. DOWN button on the set and the channel button (4) on the remote control simultaneously and adjust the Tracking +/- button until the arising to the down of Head Switching Pulse becomes 6.5 ± 0.5H.

(Refer to Fig. 2-1-A, B)

Press the Tracking Auto button.

6.5H

Fig. 2-1-B

CH-2

CH-1

CH-2

Fig. 2-1-A

2. BASIC ADJUSTMENTS

2-2: VCO FREERUN

Place the set with Aging Test for more than 10 minutes. Receive the VHF HIGH. Disconnect the Antenna while receiving the VHF HIGH and set to the Noise screen. Once turn off the Power and turn on the Power again. Approxi. 3 seconds later, input the Antenna again. Connect the digital voltmeter between the pin 5 of CP351 and the pin 1 (GND) of CP351. Activate the adjustment mode display of Fig. 1-1 and press the channel button (03) on the remote control to select "VIF VCO". Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.5V. After the 2.5V adjustment, countdown the VIF VCO step No. by 1 step with the VOL. DOWN button.

On-Screen Display Adjustment

Unplug the AC plug for more than 5 seconds to set the clock to the non-setting state. Then, set the volume level to minimum. Press the VOL. DOWN button on the set and the Channel button (9) on the remote control simultaneously to appear the adjustment mode on the screen as shown in Fig. 1-1.

Fig. 1-1

Use the Channel UP/DOWN button or Channel button (0-9) on the remote control to select the options shown in Fig. 1-2. Press the MENU button on the remote control to end the adjustments.

FUNCTION

OSD H CUT OFF RF AGC DELAY VIF VCO H VCO H PHASE V SIZE V SHIFT R DRIVE B DRIVE R CUT OFF G CUT OFF B CUT OFF

NO.

00 01 02 03 04 05 06 07 08 09 10 11 12

Fig. 1-2

FUNCTION

BRIGHTNESS CONTRAST COLOR TINT SHARPNESS FM LEVEL LEVEL SEPARATION 1 SEPARATION 2 TEST MONO TEST STEREO X-RAY TEST

NO.

13 14 15 16 17 18 19 20 21 22 23 24

00 OSD 15

D2-2

ELECTRICAL ADJUSTMENTS

2-3: RF AGC DELAY

Receive the VHF HIGH (63dB). Connect the digital voltmeter between the pin 5 of CP351 and the pin 1 (GND) of CP351. Activate the adjustment mode display of Fig. 1-1 and press the channel button (02) on the remote control to select "RF AGC DELAY". Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.9V ± 0.15V.

(TV SECTION)

2-4: CONSTANT VOLTAGE

Connect the digital voltmeter to the TP601. Set condition is AV MODE without signal. Using the remote control, set the brightness and contrast to normal position. Adjust the VR502 until the digital voltmeter is 135 ± 0.5V.

2-8: HORIZONTAL PHASE

Receive the center cross signal from the Pattern Generator. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (05) on the remote control to select "H PHASE". Press the VOL. UP/DOWN button on the remote control until the right and left screen size of the vertical line becomes the same.

Adjust the unit to the following settings. R CUT OFF=128, G CUT OFF=128, B CUT OFF=128, BRIGHTNESS=128, CONTRAST=100 Place the set with Aging Test for more than 15 minutes. Set condition is AV MODE without signal. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "CUT OFF". Adjust the Screen Volume until a dim raster is obtained.

2-5: CUT OFF

2-6: WHITE BALANCE NOTE:Adjust after performing CUT OFF adjustment.

Place the set with Aging Test for more than 15 minutes. Receive the color bar pattern. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (10) on the remote control to select "R CUT OFF". Using the VOL. UP/DOWN button on the remote control, adjust the R CUT OFF. Press the CH. UP/DOWN button on the remote control to select the "R DRIVE", "B DRIVE", "G CUT OFF" or "B CUT OFF". Using the VOL. UP/DOWN button on the remote control, adjust the R DRIVE, B DRIVE, G CUT OFF or B CUT OFF. Perform the above adjustments 6 and 7 until the white color is looked like a white.

2-7: FOCUS

Receive the monoscope pattern. Using the remote control, set the brightness and contrast to normal position. Turn the Focus Volume fully counterclockwise once. Adjust the Focus Volume until picture is distinct.

2-9: VERTICAL SHIFT

Receive the center cross signal from the Pattern Generator. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (07) on the remote control to select "V SHIFT". Press the VOL. UP/DOWN button on the remote control until the horizontal line becomes fit to the notch of the shadow mask.

2-10: VERTICAL SIZE

Receive the cross hatch signal from the Pattern Generator. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (06) on the remote control to select "V SIZE". Press the VOL. UP/DOWN button on the remote control until the rectangle on the center of the screen becomes square. Receive a broadcast and check if the picture is normal.

2-11: SUB BRIGHTNESS

Receive the monoscope pattern. (RF Input) Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (13) on the remote control to select "BRIGHTNESS". Press the VOL. UP/DOWN button on the remote control until the white 10% is starting to be visible Receive the monoscope pattern. (Audio Video Input) Press the INPUT SELECT button on the remote control to set to the AV mode. Then perform the above adjustments 2~4.

2-11: SUB CONTRAST MANUAL

Receive the color bar pattern. (RF Input) Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (14) on the remote control to select "CONTRAST". Press the VOL. UP/DOWN button on the remote control until the contrast STEP No. becomes "100". Receive the color bar pattern. (Audio Video Input) Press the AV button on the remote control to set to the AV mode. Then perform the above adjustments 2~4.

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Memorex MVT2135B D Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual