Hitachi vt-p298gk Service Manual

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SERVICE MANUAL

OPERATE

STANDBY ON

REPEAT

REC

SYSTEM SELECT

REW

REC

REPEAT

TK No. 5303E

VT-P298GK

PLAY

F.FWD

STOP/EJECT

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

VIDEO CASSETTE DECK

June 2003

Digital Media Division, Tokai

NTSCPAL

1 CAUTIONS FOR SAFETY IN PERFORMING

REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1-1 IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . 1-1

1-1-1 Product Safety Notice . . . . . . . . . . . . . . . . . . . . . 1-1

1-1-2 Precautions during Servicing. . . . . . . . . . . . . . . . 1-1

1-1-3 Safety Check after Servicing. . . . . . . . . . . . . . . . 1-2

1-2 STANDARD NOTES FOR SERVICING. . . . . . . . . . 1-3

1-2-1 Circuit Board Indications . . . . . . . . . . . . . . . . . . . 1-3

1-2-2 Instructions for Connectors . . . . . . . . . . . . . . . . . 1-3

1-2-3 How to Remove/Install Flat Pack-IC . . . . . . . . . . 1-3

1-2-4 Instructions for Handling Semi-conductors . . . . . 1-5

1-3 NOTES WHEN USING SERVICE MANUAL . . . . . . 1-6

2 GENERAL INFORMATION. . . . . . . . . . . . . . . . .2-1

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

2-2 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2-3 COMPARISON OF MODELS . . . . . . . . . . . . . . . . . 2-2

2-3-1 Comparison of Features . . . . . . . . . . . . . . . . . . . 2-2

2-3-2 Comparison of Main Control ICs. . . . . . . . . . . . . 2-3

2-4 MECHANICAL TROUBLE INDICATOR. . . . . . . . . . 2-4

2-5 OPERATING CONTROLS AND FUNCTIONS . . . . 2-5

3 MAINTENANCE AND INSPECTION. . . . . . . . . .3-1

3-1 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . 3-1

3-2 STANDARD MAINTENANCE . . . . . . . . . . . . . . . . . 3-4

3-2-1 Service Schedule of Components. . . . . . . . . . . . 3-4

3-2-2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

4 DISASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4-1 CABINET DISASSEMBLY INSTRUCTIONS. . . . . . 4-1

4-1-1 Disassembly Flowchart . . . . . . . . . . . . . . . . . . . . 4-1

4-1-2 Disassembly Method. . . . . . . . . . . . . . . . . . . . . . 4-1

4-2 DISASSEMBLY/ASSEMBLY PROCEDURES

OF DECK MECHANISM . . . . . . . . . . . . . . . . . . . . . 4-4

4-3 ALIGNMENT PROCEDURES OF MECHANISM. . 4-12

6 EXPLODEDS VIEWS AND PARTS LIST . . . . . 6-1

6-1 EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . .6-1

6-1-1 Cabinet Section. . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

6-1-2 Deck Mechanism View 1 Section . . . . . . . . . . . . .6-2

6-1-3 Deck Mechanism View 2 Section . . . . . . . . . . . . .6-3

6-1-4 Deck Mechanism View 3 Section . . . . . . . . . . . . .6-4

6-2 REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . .6-5

6-2-1 Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . .6-5

6-2-2 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . .6-6

SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAMS

1 WIRING DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 SCHEMATIC DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . 2

2-1 Main 1/4 Sche matic Diagram. . . . . . . . . . . . . . . . . . . . 2

2-2 Main 2/4 & Sensor & Switc h Schematic Diagrams . . . 3

2-3 Main 3/4 Sche matic Diagram. . . . . . . . . . . . . . . . . . . . 4

2-4 Main 4/4 Sche matic Diagram. . . . . . . . . . . . . . . . . . . . 5

2-5 Function Schematic Diagram. . . . . . . . . . . . . . . . . . . . 6

3 WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 CIRCUIT BOARD DIAGRAMS . . . . . . . . . . . . . . . . . . . . 8

4-1 Main CBA & Sensor CBA Top View. . . . . . . . . . . . . . . 8

4-2 Main CBA Bottom View. . . . . . . . . . . . . . . . . . . . . . . . 9

4-3 Function & Switch CBA Top / Bottom View . . . . . . . . 10

5 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5-1 Servo/System Control Block Diagram. . . . . . . . . . . . 11

5-2 Video Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . 12

5-3 Audio Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . 13

5-4 Power Supply Block Diagram . . . . . . . . . . . . . . . . . . 14

6 SYSTEM CONTROL TIMING CHARTS . . . . . . . . . . . . 15

7 IC PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . 18

8 LEAD IDENTIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . 20

5 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

5-1 PREPARATION FOR SERVICING . . . . . . . . . . . . . 5-1

5-1-1 How to Enter the Service Mode. . . . . . . . . . . . . . 5-1

5-2 FIXTURE AND TAPE FOR ADJUSTMENT. . . . . . . 5-2

5-2-1 How to Use The Fixtures. . . . . . . . . . . . . . . . . . . 5-2

5-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS . . . 5-3

5-3-1 Test Equipment Required . . . . . . . . . . . . . . . . . . 5-3

5-3-2 Head Switching Position Adjustment. . . . . . . . . . 5-3

5-4 MECHANICAL ALIGNMENT PROCEDURES. . . . . 5-4

5-4-1 Service Information . . . . . . . . . . . . . . . . . . . . . . . 5-4

5-4-2 Tape Interchangeability Alignment . . . . . . . . . . . 5-5

1-A. Preliminary/Final Checking and

Alignment of Tape Path. . . . . . . . . . . . . . . . . . . . 5-6

1-B. X Value Alignment. . . . . . . . . . . . . . . . . . . . . . . . 5-6

1-C. Checking/Adjustment of Envelope Waveform. . . 5-7 1-D. Azimuth Alignment of

Audio/Control/Erase Head. . . . . . . . . . . . . . . . . . 5-7

CAUTIONS FOR SAFETY IN PERFORMING REPAIR

1-1 IMPORTANT SAFETY PRECAUTIONS

1-1-1 Product Safety Notice

Some electrical and mechanical parts have special safety-related charac teristics which are often not evident from visual inspection, nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special s afe ty c har ac te rist ic s ar e i den tified by a ! on schematics and in parts lists. Use of a substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fi re, and/or other hazards. The Product’s Safety is under review continuously and new instructions are issued whenever appropriate. Prior to shipment from the factory, our products are carefully inspected to confirm with the recognized prod uct safety and electrical codes of the countries in whic h th ey are to be sold. However, in order to maintain such comp lianc e, it is equ ally impor tant to implement the following precautions when a set is being serviced.

1-1-2 Precautions during Servicing

A. Parts identified by the ! symbol are critical for

safety. Replace only with part number specified.

B. In addition to safety, other parts and assemblies

are specified for conformance with regulations applying to spur ious rad iation. T hese m ust also be replaced only with specified re pla ce men ts. Examples: RF converters, RF c ables, noise blocking capacitors, and noise blocking filters, etc.

C. Use specified internal wiri ng. Note especially:

1)Wires covered with PVC tubing

2)Double insulated wires

3)High voltage leads

D. Use specified insulating materials for hazardous

live parts. Note especially:

1)Insulation tape

2)PVC tubing

3)Spacers

4)Insulators for transistors

E. When replacing AC primary side components

(transformers, power cord, etc.), wrap ends of wires securely about the terminals before soldering.

F. Observe t hat the wi r es do n ot co ntact h eat pr od uc-

ing parts (heatsinks, oxide metal fil m re sisto rs, fus ible resistors, etc.).

G. Check that replaced wires do not contact sharp

edges or pointed parts.

H. When a power cord has been r eplaced, c heck that

5 - 6 kg of force in any direction will not loosen it.

I. Also check areas surrounding repaired locations. J. Be careful that foreign objects (screws, solder

droplets, etc.) do not remain inside the set.

K. Crimp type wire connector

The power tr ansformer uses crimp type connectors which connect the power cord and the primary side of the transformer. When replacing the transformer, follow these steps carefully and precisely to prevent shock hazards. Replacement procedure

1)Remove the old connector by cutting the wires at a point close to the connector.

Important: Do not re-use a connector. (Discard it.)

2)Strip about 15 mm of the insulation from the ends of the wires. If the wires are stranded, twist the strands to avoid frayed conductors.

3)Align the lengths of the wires to be connected. Insert the wires fully into the connector.

4)Use a crimping tool to crimp the metal sleeve at its center. Be sure to crimp fully to th e complete closure of the tool.

L. When connecting or disconnecting the internal

connectors, first, discon nect the AC plug from the AC outlet.

1-1

1-1-3 Safety Check after Ser vicing

Examine the area surrounding the repaired location for damage or deterio ration. Observe that screws , parts, and wires have been returned to their original positions. Afterwards, do the following tests and confirm the specified values to verify compliance with safety standards.

1. Clearance Distance

When replacing primary circuit components, confirm specified cleara nce distanc e (d) and (d’) between sol dered terminals, and between terminals and surrounding metallic parts. (See Fig. 1-1-1)

T able 1-1-1 : Ratings for selected area

AC Line Voltage Clearance Distance (d) (d’)

Chassis or Secondary Conducto

Primary Circuit Terminals

dd'

110 to 240 V

Note: This table is unofficial and for reference only.

Be sure to confirm the precise values.

≥ 3 mm(d)

≥ 6 mm(d’)

2. Leakage Current Test

Confirm the specified (or lower) leakage current between B (earth ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is lower than or equal to the specified value in the table below.

Measuring Method (Power ON) :

Insert load Z between B (earth ground, power cord plug prongs) and exposed accessible parts. Use an AC voltmeter to measure acr oss the ter minals of l oad Z. See Fig. 1-1-2 and the following table.

Table 1-1-2: Leakage current ratings for selected areas

AC Line Voltage Load Z Leakage Current (i)

110 to 240 V

2kΩ RES.

Connected in parallel

50kΩ RES.

Connected in parallel

i≤0.7mA AC Peak

i≤2mA DC

i≤0.7mA AC Peak

i≤2mA DC

Exposed Accessible Part

One side of

Power Cord Plug Prongs

One side of power cord plug

Antenna terminals

A/V Input, Output

Fig. 1-1-1

AC Voltmeter (High Impedanc

Fig. 1-1-2

prongs (B) to:

RF or

Note: This table is unofficial and for reference only. Be sure to confirm the precise values.

1-2

1-2 STANDARD NOTES FOR SERVICING

1-2-1 Circuit Board Indications

1. The output pin of the 3 pin Regulator ICs is indicated as shown.

Top View

Input

2. For other ICs, pin 1 and every fifth pin are indicated as shown.

in 1

3. The 1st pin of every male connector is indicat ed as shown.

in 1

Bottom View

1-2-3 How to Remove / Install Flat

Pack-IC

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:.

(1) Prepare the hot-air flat pack-IC desoldering

machine, then apply hot air to the Flat Pack-IC (about 5 to 6 seconds). (Fig. 1-2-1)

Fig. 1-2-1

(2) Remove the flat pack-IC with tweezers while apply-

ing the hot air.

(3) B ottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire fl at pack-IC, fir st apply soldering iron to center of the fla t pack-IC and hea t up. Then remove (glue will be melted). (Fig. 1-2-6)

(4) R elease the flat pack -IC from the CBA usi ng twee-

zers. (Fig. 1-2-6)

1-2-2 Instructions for Connectors

1. When you connec t o r dis con nect the F FC (Flex ib le Foil Connector) cable, be sure to first disconnect the AC cord.

2. FFC (Flexible Foil Connector) cable should be inserted parallel into the connector, not at an angle.

FFC Cable

Connector

CBA

* Be careful to avoid a short circuit.

Caution:

1. Do not supply hot air to the chip parts around the flat pack-IC for over 6 seconds because damage to the chip parts may occur. Put maskin g tape a r ound the flat pack-IC to protect other parts from damage. (Fig. 1-2-2)

2. The flat pack-IC on th e CB A i s affixed with glue, so be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it.

Hot-air Flat Pack-IC Desoldering

CBA

Masking Tape

Tweezers

Machine

Flat Pack-IC

Fig. 1-2-2

1-3

With Soldering Iron:

F S

(1)Using desoldering braid, remove the solder from all

pins of the flat pack-IC. Wh en you use solder flux which is applied to all pins of the f lat pack-IC, you can remove it easily. (Fig. 1-2-3)

lat Pack-IC

Desoldering Braid

(4) B ottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire fl at pack-IC, fir st apply soldering iron to center of the fla t pack-IC and hea t up. Then remove (glue will be melted). (Fig. 1-2-6)

(5) R elease the flat pack -IC from the CBA usi ng twee-

zers. (Fig. 1-2-6)

Note:

When using a sold ering iron, care must be taken to ensure that the flat pack-IC is not being hel d by glue. When the flat pack-IC is removed from the CBA, handle it ge ntl y bec au se it may be damaged if force is applied.

Soldering Iron

Hot Air Blower

Fig. 1-2-3

(2) Lift each lead of the flat pack-IC upward one by

one, using a sharp pin or wire to which sold er will not adhere (iron wir e). When heati ng the pins, us e a fine tip soldering iron or a hot air desoldering machine. (Fig. 1-2-4)

Iron Wire

Soldering Iron

To Solid Mounting Point

Sha

Fig. 1-2-5

ine Tip oldering Iron

CBA

Fine Tip Soldering Iro

Fig. 1-2-4

(3)Botto m of the flat pack-IC is fixed with glue t o the

CBA; when removing enti re flat pack-IC, fi rst apply soldering iron to c en ter o f th e f lat pack-I C an d h eat up. Then remove (glue will be melted). (Fig. 1-2-6)

(4)Relea se the flat pack-IC fr om the CBA usin g twee-

zers. (Fig. 1-2-6)

Tweezers

Flat Pack-IC

With Iron Wire:

(1)Using desoldering braid, remove the solder from all

Fig. 1-2-6

pins of the flat pack-IC. Wh en you use solder flux which is applied to all pins of the f lat pack-IC, you can remove it easily. (Fig. 1-2-3)

(2) Affix the wire to a workbench or solid mounting

point, as shown in Fig. 1-2-5.

(3) While heating the pins using a fine tip soldering

iron or hot air blower, pull up the wire as the solde r melts so as to lift the IC leads from the CBA contact pads as shown in Fig. 1-2-5.

1-4

2. Installation

P i

(1) Using desoldering braid, remove the solder from

the foil of each pin of the flat pack-IC on the CBA so you can install a replac ement flat pack-IC more easily.

(2) The “I” mark on the flat pack-IC indicates pin 1.

(See Fig. 1-2-7.) Be sure this m ark matches the 1 on the PCB when position ing for installation. Then presolder the four corners of the flat pack-IC. (S ee Fig. 1-2-8.)

(3)Solder all pins of the flat pack-IC. Be sure that none

of the pins have solder bridges.

Example :

in 1 of the Flat Pack-IC

s indicated by a " " mark.

Fig. 1-2-7

1-2-4 Instructions for Handling

Semi-conductors

Electrostatic breakdown of the semi-conductors may occur due to a po tential difference ca used by electr ostatic charge during unpacking or repair work.

1. Ground for Human Body

Be sure to wear a gr oundin g band (1MΩ) that is properly grounded to re move any static electricity th at m ay be charged on the body.

2. Ground for Workbench

(1) Be sure to place a conductive sheet or copper plate

with proper groundin g (1MΩ) on the workbench or other surface, where the semi-conductors are to be placed. Because the static electricity charge on clothing will no t escape through the body grounding band, be careful to avoid contacting semi-conductors with your clothing.

< Incorrect >

CBA

Presolder

Flat Pack-IC

Fig. 1-2-8

CBA

< Correct >

Grounding Ban

1MΩ

CBA

1MΩ

Conductive Sheet or Copper Plate

1-5

1-3 NOTES WHEN USING SERVICE MANUAL

(

The following shows the contents to be noted when using service manual:

Standard Notes WARNING

Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot nece ssar ily b e ob tai ned by us ing repl ac ement components rated for higher voltage, wattage,

Notes:

1. Do not use th e part numb er shown o n these drawings for ordering. The correct part number is shown in the parts list, and may be slightly different or amended since these drawings were prepared.

2. All voltages are DC voltages unless otherwise specified.

etc. Replacement parts that have th ese spe cial safety characteristics are identified in this manual and its supplements; electrical comp onents having such features are identified by the mark " ! " in the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts that

Values in schematic diagrams

The values, dielectric strength (power capacitance) and tolerances of the resistors (excluding variable resistors) and capacitors are indicated in the sche-

matic diagrams using abbreviations. do not have the same s afety character istics as specified in the parts list may create shock, fire, or other hazards.

Capacitor Temperature Markings

Mark

(B)

Capacity

change rate

±10%

(F) +30 - 80% 20°C -25~+85°C

(SR)

±15%

Standard

Temperature

temperature

20°C -25~+85°C

range

[ Resistors ]

Item Indication

No indication.............................Ω

Value

K..............................................kΩ

M.............................................MΩ

No indication...............1/4W,1/6W

Power capac-

itance

All capacitances other than the above are indicated in schematic diagrams.

(Z) +30 - 80% 20°C -10~+70°C

[ Capacitors ]

Capacitors and transistor s are represented by the following symbols.

CBA Symbols

(Top View) (Bottom View)

Bottom View)

E C B

(Top View)

E C B

(Top View)

E C B

Electrolytic Capacitor

Transistor or Digital Transistor

(Top View)

NPN Transistor

NPN Digital Transistor

E C B

(Top View)

E C B

PNP Transistor

PNP Digita Transistor

Item Indication

Value

No indication...........................µF

P..............................................pF

No indication..........................50V

Dielectric

strength

All dielectric strengths other than 50V are indicated in schematic diagrams.

[ Coils ]

Item Indication

Value

µ...............................................µH

m.............................................mH

1-6

Schematic Diagram Symbols

Digital Transistor

LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING

T b m

PAGES:

1. CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE.

2. CAUTION:

Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F1001) is blown, first check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supp ly. Otherwi se it may cause some compon ents in the power supply circuit to fail.

3. Note:

(1) Do not use the part number shown on the drawings for ordering. The correct part number is shown in the parts

list, and may be slightly different or amended since the drawings were prepared.

(2) To maintain original function and reliability of repaired units, use only original replacement parts which are

listed with their part numbers in the parts list section of the service manual.

4. Wire Connectors

(1) Prefix symbol "CN" means "connector" (can disconnect and reconnect). (2) Prefix symbol "CL" means "wire-solder holes of the PCB" (wire is soldered directly).

5. Voltage indications for PLAY and REC modes on the schematics are as shown below:

he same voltage for oth PLAY & REC

odes

6. How to read converged lines

-D3 Distinction Area

Line Number

(1 to 3 digits)

Examples:

1. "1-D3" means that line number "1" goes to area "D3

2. "1-B1" means that line number "1" goes to area "B1

7. Test Point Information

: Indicates a test point with a jumper wire across a hole in the PCB. : Used to indicate a test point with a component lead on foil side. : Used to indicate a test point with no test pin.

123

5.0

5.0 (2.5)

Indicates that the voltage is not consistent here.

PLAY mode

Unit: Vol

REC mode

1-B1

AREA D3

AREA B1

1-D3

ABCD

: Used to indicate a test point with a test pin.

1-7

GENERAL INFORMATION2

•

ay 3

hours of playback with a T-160 tape.

T T L U R

A V R

without notice.

2-1 SPECIFICATIONS

GENERAL SPECIFICATIONS

layback system: Twin heads,

Helical scanning system ape width: 12.7mm (1/2 inch) ape speed SP: 23.39mm/s P: 11.70mm/s

sable tape: VHS video cassette

F output: UHF channel 22 to 69 for

PAL G/K

orizontal resolution: 230 TV lines

for VHS Terminals

udio input/output: RCA connector ✕2 ideo input/output: RCA connector ✕ 2 F input/output: IEC connector ✕2

ELECTRICAL SPECIFICATIONS

Video input: 0.5~2.0Vp-p Video output: 1Vp-p75 ohm unbalanced Video S/N: 42dB Audio input: -10dBV Audio output: -6dB Audio frequency response: 200Hz to 6 kHz Audio S/N: 40dB

OTHER SPECIFICATIONS

Power consumption: 12W Operation temperature: Main input: 110-240V, 50/60Hz Cabinet dimension: Weight: Approx. 2.0kg Accessories: RF cord/ Remote control

Design and specifications are subject to change

5 C to 40 C

360(W) ✕ 92(H) ✕216(D) m

AV cable

2-2 FEATURES

Auto Power On and Stand-by System–

Automatically turns the VCP on as you insert a tape. When the end of a tape is reached, the VCP will automatically rewind to the beginning. The tape will be ejected and the VCP will shut itself off. Auto Play– When you insert a tape without the erase prevention tab, the VCP starts playback automatically. Auto Rewinding– When the end of a tape is reached during playback or fast-forward, the VCP will automatically rewind to the beginning. Auto Eject– The cassette mechanism will disengage after rewinding and the tape will be ejected and the VCP will shut itself off. Repeat Playback– Allows you to repeat a tape indefinitely without pressing the PLAY button. Auto Tracking– Adjusts the tracking automatically for each tape you play. Auto Head Cleaner– Automatically cleans heads as you insert or remove a cassette. Picture Control– Improves playback picture quality of worn tapes, especially rental tapes.

• Speed Search– You may view the video programm

at a fast speed in either forward or reverse direction

• Line Recording– You can record a programme from

another source via the AUDIO/VIDEO IN sockets.

• Multi color System– PALor MESECAM recorded

tapes can be played back with a multi system receiv er.

• NTSC Playback– Tapes recorded with the NTSC

system can be played back with this unit via a PAL system TV set. (This feature is only available in the SP mode).

• Infrared Remote Control– Allows you to use all t

tape transport controls and STANDBY on/off from remote location.

• Auto Voltage (AC110-240V, 50/60Hz)– This VCP

designed to match the AC power voltage 110V-240 50/60Hz automaticcaly.

• 2 Step Picture Search Operation– Allows you to

view the video program at a high speed or super hig speed in either a forward or reverse direction in the LP mode.

• Two different tape speeds– Select the Standard Pl

(SP mode) and Long Play (LP mode) for up to 5-1/

2-1

2-3 COMPARISON OF MODELS

2-3-1 Comparison of Features ←: Same as on left

ITEM VT-P298GK VT-P198GK/P198GK(U)/(G)

Cabinet Dimension 360(W) x 92(H) x 216(D) mm

Weight 2.0kg

Power Consumption 12W 14W

APPEARANCE

Video Format VHS

Y/C Separation Comb Filter

YNR (Luminance Noise Reduction) Circuit

VIDEO

New Synchronise Circuit Not Provided

Picture Control Provided (NORMAL/SOFT/SHARP)

Video/Audio Input (Rear) 1/1 (Line Rec)

Video/Audio Input (Front) Not Provided

INPUT/

Video/Audio Output (Rear) 1/1

OUTPUT

Remote Controller VT-RMP298GK VT-RMP98GK/VT-RMP99GK

OSD Ianguages 1(English)

Stereo CM Skip Feature Not Provided

Auto Clock Feature Not Provided

Number of Timer Programming Not Provided

Self Diagnosis Function Provided (5 Modes)

Back-up Time Not Provided

OTHERMECHANISM

SQPB Not Provided

NTSC playback on PAL TV Provided

Surge Absorber Not Provided

Auto Power Off Feature Provided (AUTO REW P-OFF)

Local Broadcast Setting Not Provided

Multi Search Feature Not Provided

Search Speed

FF/REW Time (T-120 Tape) FF/REW: approx. 4min

Head Composition 32 µm/32 µm

Head Material Ferrite

VISS Not Provided

PAL SP:X5/X7, LP:X5/X11,

Provided

NTSC SP:X5

←

2-2

2-3-2 Comparison of Main Control ICs ←: Same as on left

ITEM OPERATION VT-P298GK VT-P198GK/P198GK(U)/(G)

Video Video Signal Process LA71584M (IC301)

Audio

System Control

Timer Display Driver Included in IC501

Power Switching Driver Not Provided

FM Audio Signal Process Not Provided

Linear Audio Signal Process Included in IC301

Main Microcomputer µP M37762MCA-AB2GP (IC501) M37768M6A-1D6GP (IC501)

VCR-EEP ROM BR24C01AF-W (IC503)

Reset Not Provided

Loading Motor Drive

Cylinder/Loading Motor Control

Power Reset

Included in IC on the Capstan Motor

CBA

Included in IC on the Capstan Motor

CBA

Included in IC on the Capstan Motor

CBA

M24C01-MN6 (IC505)

←

2-3

2-4 MECHANICAL TROUBLE INDICATOR

Note:

The following symbols will appear on the indicator panel to indicate mechanical trouble.Display panel.

Indicator Mode

at 0.4Hz interval When power safety is not functioning properly. at 0.8Hz interval When capstan/reel mechanism is not functioning properly.

REPEAT

at 1.6Hz interval When tape loading mechanism is not functioning properly. at 3.2Hz interval When cassette loading mechanism is not functioning properly. at 6.4Hz interval When the drum is not functioning properly.

2-4

– FRONT VIEW –

PLAY

REW

REC

F.FWD

STOP/EJECT

REPEAT

SYSTEM SELECT

OPERATE

STANDBY ON

678911

12435

AUDIO

VIDEO

RF OUT

AERIAL

OUT IN

1312 14 1715 16

2-5 OPERATING CONTROLS AND FUNCTIONS

1 CASSETTE COMPARTMENT 2 REW (VISUAL SEARCH) button– Press to

rewind tape or to view video in reverse during playback at a fast speed. Press the PLAY button to return to normal speed.

3 PLAY button– Press to begin playback of a tape. 4 F. FWD (VISUAL SEARCH) button– Press to

advance tape or to view video in forward direction during playback at a fast speed. Press the PLAY button to return to normal speed.

5 STOP/EJECT button– Press to stop tape motion /

remove tape from the appliance.

6 REPEAT button– Press to repeat playback

automatically.

7 REC button– Press to record a broadcast from

another source.

– REAR VIEW AND TERMINALS –

8 SYSTEM SELECT button– Press to select the

colour system PAL, MESECAM, NTSC 4.43 or NTSC3.58. (See “PLAYBACK” section.)

9 INDICATOR

• STANDBY– Lights on when power is connected.

• ON– Lights on when the VCP turns on.

• REPEAT– Lights on when the Repeat Playback is

functioned.

• REC– Lights on during recording.

10 Remote Sensor window– Receives the infrared

control signals from the remote control unit.

11 OPERATE button– Press to turn the VCP on and

stand-by.

2 AUDIO OUTjack– Connect to the audio input

jack of your TV.

3 VIDEO OUT jack– Connect to the video input

jack of your TV.

4 VIDEO IN jack– Connect to video output jack of

your video equipment.

15 AUDIO IN jack– Connect to audio output jack of

your audio equipment.

16 RF OUT jack– Connect to aerial jack of your TV. 17 AERIALjack– Connect to the TV aerial coaxial

cable.

2-5

You can operate most of your VCP’s tape transport functions from the Remote Control (supplied). T

he buttons on the Remote Control have the same functions as the corresponding buttons on the VCP.

1 1

0:12:34 SP

0:12:34

Press once

5 seconds

OPERATE

REW

PLAY

STOP

F.FWD

PAUSE/STILL

REPEAT

DISPLAY

REC

SPEED

EJECT

PICTURE

SELECT

RESET

COUNTER

MEMORY

TRACKING

OW TO USE THE REMOTE CONTROL

1 OPERATE button– Press to turn the VCP on and

stand-by.

2 TRACKING buttons– Press to adjust to minimize

video “noise” (lines or dots on screen) during playback. Most often, this is necessary when playing pre-recorded tapes or tapes recorded on other VCP’s.

3 DISPLAY button– Press to

display the tape status, TV screen. Each time you press this button, TV screen will change as shown.

4 REPEAT button– Press to repeat

playback automatically.

5 PLAY button– Press to begin

playback of the tape.

6 REW (VISUAL SEARCH)

button– Press to rewind the tape.

Or press to view the picture rapidly in reverse, during the Playback mode.

7 REC button– Press to begin recording. 8 SPEED button– Press to set desired recording

speed (SP/LP).

9 PAUSE/STILL button– Press to stop the tape

temporarily during playback or recording.

0 STOPbutton– Press to stop tape motion. 1 F.FWD (VISUAL SEARCH) button– Press to

move the tape forward rapidly. Or press to view the picture rapidly in forward during the Playback mode.

2 PICTURE SELECT button– Press to improve the

playback picture quality of noisy tapes. (ex: rental tape etc.)

13 COUNTER RESET button– Press to reset count

to 0:00:00.

14 COUNTER MEMORYbutton– Press to set

counter memory on and off.

15 EJECT button– Press to remove tape from the

VCP.

2-6

MAINTENANCE AND INSPECTION3

3-1 TROUBLESHOOTING

Troubleshooting is how to service for the specifying malfunction or poor parts. Detect malfunction or poor parts and service as the following charts.

Video problem 1 (No recording Video)

LINE INPUT (AV)

Check Video signal at pin (38) of IC301. Check AV cable, JK752 and line between JK752 and

Check Video signal at pins (31, 51, 72) of IC301.

Check Video signal at pin (20) of IC301.

Check Video signal at pin (90) of IC301.

Cleaning the Video Head. (See page 3-5.) Or check Cylinder Assembly and service it if defective.

pin (38) of IC301, and service it if defective.

Check IC301, X301, etc., and service it if defective.

Check Q304 and their periphery, and service it if defective.

Check IC301, X301, etc., and service it if defective.

Video problem 2 (No playback Video)

Check Video signal at pins (88, 90) of IC301 and TP301 (C-PB).

Check Video signal at pins (51, 72) of IC301.

Check Video signal at pin (20) of IC301.

Check Video signal at pin (29) of IC301.

Check IC301, X301, etc., and service it if defective.

Cleaning the Video Head. (See page 3-5.) Or check Cylinder Assembly and service it if defective.

Check Q304 and their periphery, and service it if defective.

Check IC301, X301, etc., and service it if defective.

Check Video signal at pin (52) of IC501.

OK RF OUT LINE OUT

Check Video signal at pin (6) of MD701.

OK OK

Check MD701 and service it if defective.

Check line between pin (52) of IC501 and pin (6) of MD701, and service it if defective.

NG NG

Check IC501, X501 and line between pin (29) of IC301 and pin (50) of IC501, and service it if defective.

Check Video signal at pin (19) of JK751.

Check JK751 and AV cable, and service it if defective.

Check line between pin (52) of IC501 and JK751, and service it if defective.

3-1

Audio problem 1 (No recording Normal Audio)

LINE INPUT (AV)

Check Audio signal at pin (76) of IC301.

Check Audio signal at pins (7, 96) of IC301.

Check Tape interchangeability alignment. (See page 3-5.)

Cleaning the Audio Control Head. (See page 3-5.)

Audio problem 2 (No playback Normal Audio)

(AV)

Check Audio signal at pin (4) of IC301.

Check AV cable, JK752 and line between JK752 and pin (76) of IC301, and service it if defective.

Check IC301, X301, etc., and service it if defective.

Check ACE Head Assembly and service it if defective.

Check Tape interchangeability alignment. (See page 5-5.)

Check ACE Head Assembly and service it if defective.

Check Audio signal at pin (96) of IC301.

RF OUT LINE OUT

Check Audio signal at pin (2) of MD701.

OK OK

Check MD701 and service it if defective.

Check line between pin (96) of IC301 and pin (2) of MD701, and service it if defective.

3-2

Cleaning the Audio Control Head. (See page 3-5.)

NG NG

Check IC301, X301, etc., and service it if defective.

Check

Audio

signal at JK751.

Check JK751 and AV cable, and service it if defective.

Check line between pin (96) of IC301 and JK751, and service it if defective.

Power problem

It is highly recommended that a variable isola tion transformer which can monitor current be used. (Alternatively a variable AC source which monitors current will do). Read directions below befo re power is added!

Repair method CHECK

Connect unit to the isolation transformer and slowly increase the AC supply while monitoring the current, if it draws too much current (Be ware fuse is rated for 1.6 amps), then turn off supply and do repair method #1.

Check whether the primary rectifying DC of the Switching power supply has an output. (Reading should be about 168V.)

YES

With the primary DC working check the secondary 5V.

YES

Are the 12V and 5V higher than normal?

Although the secondary 5V is working, are any of the other voltages higher than normal (12V)?

There is no problem on the SW power supply.

YES

1] Check for any defect ive parts while the secondary rectifying diodes are disconnected (D011, D013 and D014) perform a diode check in both forward and reverse directions through a tester.

2] Remove the following components and check for defects: snubber diode ( D00 5) , sw itc hi ng F ET ( Q00 1) , source resistor (R006), control transistor (Q002).

Repair method #2

Check the fuse 1.6A (F00 1), primary rectifying d iodes (D001-D004) as possible problems. Remove the above mentioned parts and check them. The circuit which turns on switching FET (Q001) may be regarded as a possibl e cause, even if the load at the secondary side is shorted, it can't be detected because switching FET (Q001) isn't operating. Perform check according to the step 1 and 2 of repair method #1 and check the following parts: (Remove the part from PCB) Switching FET (Q001), source resistor (R006), gate resistor (R008) and start resistor (R003, R004, R005 and R028).

Repair method #3

A circuit to turn on switching FET (Q001) may not work and this may be regard ed as a cau se of trouble. Even if the load at the secondary side is short-circuited, it cannot be detected because switching FET (Q001) does not turn on. Therefor e, perform check acco rding to the steps 1] and 2] of the repair method #1 and execute the under-mentioned parts breakage check. (Remove the part from PCB.) switching FET (Q001), source resistor (R006), control transistor (Q002) , gate resist or (R008) and start resistor (R003, R004, R005 and R028).

Repair method #4

Repair method #1

(Power must be off) Short circuit in the s econd ary si de. c heck di ode D 011, D013, D014, switching FET (Q001), control transi stor (Q002), diode (D006, D018), and resistor (R014) replace as necessary. Disconnect 44V diod e (D011), 12V di ode (D013), 5V diode (D014). Check the load continuity of 44V line, 12V line and 5V line through a tester (resistance range). If the tester indic ates a lower resistance v alue around 0 ohm, the line is short-circuited. Before repairing the switc hing power supply, find out the short-circuited area of such line and repair it. If the tester does not indicate any low resistance value (around 0 ohm), no l oad is shor t-cir cuited a nd the re i s no problem.

The feedback c ircuit whic h is monitor ed by the output of voltage may not w ork and this may be regarded as a possible cause, rem ove control transis tor Q002 and check for defects. More ov er, a photo coupler (IC001) and transistor (Q004) may be defective, replace any defective parts with factory originals.

Repair method #5

If the output voltage of the secondary side is slightly high, the line load may be in the "OPEN" state and this may be regarded as a cause of troub le. If there is no output voltage on the secondary side, the rectifying diodes (D011) and (D013) may be defective.

3-3

3-2 STANDARD MAINTEN ANCE

3-2-1 Service Schedule of Components

h: Hours : Check I: Change

Deck Periodic Service Schedule

Ref.No. Part Name 1,0 00 h 2,000 h 3,0 00 h 4,000 h

B3 Loading Motor Assembly I B8

B587

B31 ACE Head Assembly I

B573,B574

B37 B52 Cap Belt II B73

B133,B134

B410 Pinch Arm(A) Assembly II B414 B416

Cylinder Assembly

Pulley Assembly Tension Lever Assembly

Reel (SP)(D2), Reel (TU)(D2) Capstan Motor

FE Head Idler Gear, Idler Arm

M Brake (SP) Assembly M Brake (TU) Assembly

B525 LDG Belt II B569

Notes:

1.Clean all parts for the tape tr ansport (Upp er Drum with Video Head / Pinch Roll er / Audio Control Head / Full

Erase Head) using 90% lsopropyl Alcohol.

2.After cleaning the parts, do all DECK ADJUSTMENTS.

3.For the reference numbers listed above, refer to Deck Exploded Views.

Cam Holder (F)

3-4

3-2-2 Cleaning

Cleaning of Video Head

Clean the head with a head cleanin g stick or chamois cloth.

Procedure

1.Remove the top cabinet.

2.Put on a glove (thin type) to avoid touching the

upper and lower drum with your bare hand.

3.Put a few d rops of 90% Isopropyl alcohol o n the

head cleaning stick or on the chamois cloth and, by slightly pressi ng it a gai ns t th e he ad tip , tur n the upper drum to the right and to the left.

Notes:

1.The video head surface is made of very hard

material, but since it i s very thin, avoid clea ning it vertically.

2.Wait for the cleaned part to dry thorough ly before

operating the unit.

3.Do not reuse a stained head cleaning stick or a

stained chamois cloth.

Cleaning of ACE Head

Clean the head with a cotton swab.

Procedure

1.Remove the top cabinet.

2.Dip the cotton swab i n 90% Isopropyl alcoho l and clean the ACE head. Be careful not to damage the upper drum and other tape running parts.

Notes:

1.Avoid cleaning the ACE head vertically.

2.Wait for the cleaned part to dry thoroughly before operating the unit or damage may occur.

ACE Hea

Upper Cylinder

Do Not !

ideo Head

Cleaning Stick

3-5

DISASSEMBLY 4

4-1 CABINET DISASSEMBLY INSTRUCTIONS

4-1-1 Disassembly Flowchart

This flowchart indicates the disassem bly steps to gain access to item(s) to be serviced. When reassembling, follow the steps in reverse order. Bend, route, and dress the cables as they were originally.

[1] Top Case

[2] Front Assembly

[3] VCR Chassis Unit

[7] Deck Assembly

[8] Main CBA

[4] Cylinder Shield

[5] Function CBA

[6] Switch CBA

4-1-2. Disassembly Method

ID/

LOC.

No.

[1] Top Case 4-1-1 3(S-1) [2]

[3]

PART

Front Assembly

VCR Chassis Unit

Fig. No.

4-1-2 *3(L-1),*4(L-2) -

4-1-3 5(S-2), (S-3) 1

REMOVAL

REMOVE/*UNHOOK/ UNLOCK/RELEASE/ UNPLUG/DESOLDER

Note

(1): Identification (location) No. of parts in the figures (2):Name of the part (3):Figure Number for reference (4): Identification of parts to be removed, unhooked,

unlocked, released, unplugged, unclamped, or desoldered. P=Spring, L=Locking Tab, S=Screw, CN=Connector *=Unhook, Unlock, Release, Unplug, or Desolder e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two Locking Tabs (L-2)

(5):Refer to “Reference Notes.”

Reference Notes

CAUTION: Locking Tabs (L-1) and (L-2) are fragile. Be careful not to break them.

1. Remove five Screws (S-2). Then slowly lift the VCR Chassis Unit (Deck Assembly, Function CBA, Power SW CBA and Main CBA) up.

2. When reassembling, solder wire jumpers as shown in Fig. 4-1-4.

3. Before installing the Deck Assembly, be sure to place the pin of LD-SW on Main CBA as sho wn in Fig. D5. Then, install the Deck Assembly while aligning the hole of C am Gear with the pin of LDSW, the shaft of Cam Gear with the hole of L D- SW as shown in Fig. 4-1-5.

(S-1)

Cylinder

[4]

Shield Function

[5]

CBA Switch

[6]

CBA Deck

[7]

Assembly

[8] Main CBA

↓

(1)

↓

(2)

4-1-4 2(S-4) -

4-1-4 Desolder -

4-1-4,

4-1-5

4-1-4,

4-1-5

(S-5), (S-6), (S-7), Shield Cover, 2(W-1) Desolder

---------- -

↓

(3)

↓

(4)

[1] T op Case

2,3

↓

(5)

Fig. 4-1-1

4-1

(L-2)

(S-4)

[4]Cylinder Shield

[2] Front Assembly

[3] VCR Chassis Unit

(S-3)

(L-1)

(S-2)

Fig. 4-1-2

[7] Deck Assembly

(S-6)

[6] Switch CBA

Desolder

Shield Cover

FE Head

(W-1)

(S-5)

Desolder

[5] Function CBA

Cylinder Assembly

ACE Head Assembly

(W-1)

[8] Main CBA

(S-7)

Fig. 4-1-3

From Capstan Motor Assembly

Printing side

Lead connections of Deck Assembly and Main CBA

From ACE Head Assembly

Lead with blue stripe

Desolder

BOTT OM VIEW

From Cylinder Assembly

Desolder

From FE Head

Lead with blue stripe

Fig. 4-1-4

4-2

[8] Main CBA

[7] Deck Assembly

SW507 LD-SW

Cam Gear

Shaft

LD-SW

Hole

[8] Main CBA

Fig. 4-1-5

4-3

4-2 DISASSEMBLY/ASSEMBLY PROCEDURES OF DECK

MECHANISM

Before following the procedures described below, be sure to remove the deck assembly from the cabinet. (Refer to CABINET DISASSEMBLY INSTRUCTIONS on page 4-1.) All the following proc edures, including those for adjustment and replacement of parts, should be done in Ejec t mode; see the positio ns of [41 ] and [42] in Fig. DM1 on page 4-6. Wh en reass embli ng, foll ow the ste ps in reverse order.

STEP /LOC.

START-

ING

No.

[1] [1] Guide Holder A T DM3 2(S-1) [2] [1] Cassette Holder Assembly T DM4 [3] [2] Slider (SP) T DM5 *(L-1) [4] [2] Slider (TU) T DM5 *(L-2) [5] [4] Lock Lever T DM5 *(L-3),*(P-1) [6] [2] Cassette Plate T DM5 (S-1A) [7] [7] Cylinder Assembly T DM1,DM6 Desolder, 3(S-2)

[8] [8] Loading Motor Assembly T DM1,DM7 [9] [9] ACE Head Assembly T DM1,DM7 (S-4)

[10] [2] Tape Guide Arm Assembly T DM1,DM8 *(P-2)

[11] [10] C Door Opener T DM1,DM8 *(L-4) [12] [11] Pinch Arm (B) T DM1,DM8 *(P-3) [13] [12] Pinch Arm Assembly T DM1,DM8 [14] [14] FE Head Assembly T DM1,DM9 (S-5) [15] [15] Prism T DM1,DM9 (S-6) [16] [2],[15] Sensor Gear T DM1,DM15 [17] [2] Slide r Shaft T DM10 *(L-5) [18] [17] C Drive Lever (SP) T DM10 [19] [17] C Drive Lever (TU) T DM10 (S-7),*(P-4)

[20] [21] [21] Clutch Assembly B DM2,DM12 (C-1)

[22] [22] Cam Holder (F) B DM2,DM12 *(L-6) [23] [23] Cam Gear (B) B DM2,DM12 (C-4)*(P-5) [24] [24] Mode Gear B DM2,DM13 (C-2)

[25] [26] [22] Worm Holder B DM2,DM13 (S-9),*(L-9),*(L-10)

[27] [26] Pulley Assembly B DM2,DM13 [28] [25],[26] Cam Gear (A) B DM2,D M13 [29] [25] Idler Gear B DM1,DM14 [30] [29] Idler Arm B DM1,DM14 *(L-11) [31] [25] BT Arm B DM2,DM14 *(P-6)

[32] [25]

No.

[7],[8],

[10]

[21],[23],

[24]

Capstan Motor B DM2,DM11 3(S-8), Cap Belt

Mode Lever B DM2,DM13 (C-3), *(L-8)

Loading Arm (SP) Assembly

PART

Fig. No.

B DM2,DM14

REMOVAL INSTALLATION REMOVE/*UNHOOK/

UNLOCK/RELEASE/ UNPLUG/DESOLDER

Desolder, LDG Belt, 2(S-3)

ADJUSTMENT

CONDITION

(+)Refer to Alignment Sec.Page 4-12

4-4

STEP /LOC.

START-

ING

No.

[33] [34] [2],[25] M Brake (TU) Assembly T DM1,DM15 *(P-7), Brake Belt

[35] [2],[25] M Brake (SP) Assembly T DM1,DM15 *(P-8) [36] [35] Tension Lever Assembly T DM1,DM15 [37] [36] T Lever Holder T DM15 *(L-12) [38] [34] Reel (TU)(D2) T DM1,DM15 [39] [38] M Gear T DM1,DM15 [40] [36] Reel (SP)(D2) T DM1,DM15

[41] [32],[36]

[42] [33] [43] [19] TG Post Assembly T DM1,DM16 *(L-13) [44] [28] Rack Assembly R DM17 [45] [44] F Door Opener R DM17

[46] [46] Cleaner Assembly T DM1,DM6 [47] [46] CL Post T DM6 *(L-14)

↓

(1)

No.

[32]

↓

(2)

Loading Arm (TU) Assembly

Moving Guide S Preparation

Moving Guide T Preparation

PART

↓

(3)

Fig. No.

B DM2,DM14

T DM1,DM16

↓

(4)

↓

(5)

REMOVAL INSTALLATION REMOVE/*UNHOOK/

UNLOCK/RELEASE/ UNPLUG/DESOLDER

↓

(6)

ADJUSTMENT

CONDITION

(+)Refer to Alignment Sec.Page 4-12

↓

(7)

(1): Follow steps in sequence. When reassembling, follow the steps in reverse order.

These numbers are also used as identification (location) No. of parts in the figures. (2): Indicates the part to start disassembling with in order to disassemble the part in column (1). (3):Name of the part (4): Location of the part: T=Top B=Bottom R=Right L=Left (5): Figure Number (6): Identification of parts to be removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered.

P=Spring, W=Washer, C=Cut Washer, S=Screw, *=Unhook, Unlock, Release, Unplug, or Desolder

e.g., 2(L-2) = two Locking Tabs (L-2). (7): Adjustment Information for Installation

(+):Refer to Deck Exploded Views for lubrication.

4-5

T op View

[14]

[36]

[35]

[42][41] [43][9]

[7] [46] [8]

[13] [11]

[15]

[10] [12]

[34]

Bottom View

[26]

[27]

[23] [28]

[20]

[29]

[30][40] [16] [39] [38]

Fig. DM1

[33]

[32]

[24]

[25]

4-6

[31][21][22]

Fig. DM2

(S-1)

[1]

(S-1)

Fig. DM3

(S-1A)

[7]

(L-1)

[3]

[6]

(L-2)

(P-1)

[46]

[4]

(L-3)

[5]

Fig. DM5

Pin D

Pin C

Slots B

First, while pushing the locking tab as shown at right, slide and pull up the right side on [2] to release Pin A and Pin B from the slots A. Then, remove Pin C and Pin D on [2] from the slots B as shown.

[2]

Pin A

Locking tab

Pull up

Slide

Pin B

Slot A

View for A

Fig. DM4

Desolder from bottom

(S-2)

View for A

[47]

(L-14)

Lead with Red Stripe

Fig. DM6

4-7

[9]

)

(S-4)

[8]

[14]

(S-5)

[16]

(S-6)

[15]

(S-3)

Adj. Screw

[13]

LDG Belt

Desolder from bottom

Lead with White Stripe

View for A

[8]

Fig. DM7

[11]

(L-4)

(P-3)

[12]

[10]

Fig. DM9

[18]

(L-5)

[17]

[19]

(P-4

(P-2

4-8

Pin of [12]

View for A

Pin of [10]

Groove of [28]

[28]

When reassembling [10] and [12], confirm that pin of [10] and pin of [12] are in the groove of [28] as shown.

Fig. DM8

(S-7)

Fig. DM10

Cap Belt

]

[20]

(S-8)

[23]

(C-4)

(P-5)

[22]

(L-6)

(C-1)

[21

Fig. DM1

Pin on bottom of [23]

[28]

When installing [23], install the spring (P-5) to [28] as shown in the left figure, and then install [23] while pressing the spring (P-5) to the direction of the arrow in the left figure and confirming that the position of the spring (P-5) is placed as shown in the left figure.

[23]

T op Vie w

Pin on [22]

[28]

Position of pin on [22]

Fig. DM12

4-9

[25]

)

(C-3)

[31]

(P-6)

Refer to the Alignment Section, Page 4-12.

(L-10)

[27]

[28]

Pin of [34]

(S-9)

(L-8)

[26]

(L-9)

Position of Mode Lever when installed

Pin of [31]

Pin of [35]

(C-2)

[24]

[30]

[29]

(L-11)

[40]

[36]

[33]

[32]

Fig. DM14

Break belt

(P-7

[34]

Bottom View

[28]

T op Vie w

Align [25] and [28] as shown.

First groove on [28]

First tooth on [44]

[28]

When reassembling [28], align the first groove on [28] to the first tooth on [44] as shown.

[25]

Fig. DM13

(P-8)

[35]

[37]

turn

[39]

(L-12)

[38]

turn

Fig. DM15

4-10

[41]

[42]

[43]

(L-13)

Fig. DM16

[45]

[44]

Slide

Fig. DM17

4-11

4-3 ALIGNMENT PROCEDURES OF MECHANISM

The following procedures describe how to align the individual gears and levers that make up the tape loading/unloading mechanism. Since information about the state of the mechanism is provided to the System Control Circuit only through the Mode Switch, it is essential that the corr ect relatio nship bet ween ind ividual gears and levers be maintained.

All alignments are to be performed with the mechanism in Eject mode, in the sequenc e given. Each

procedure assumes th at all pr evious pro cedures hav e been completed.

IMPORTANT:

If any one of these alignments is not performed

properly, even if off by only one tooth, the unit will

unload or stop and i t may result in damage to the

mechanical or electrical parts.

Alignment points in Eject Position

T op View

Alignment 3

Alignment 1

Loading Arm (SP) and (TU) Assembly

Install Loading Arm ( SP) and (TU) Assembly so that their triangle marks point to each other as shown in Fig. 4-3-2.

Alignment 2

Mode Gear

Keeping the two triangles pointing at each other, install the Loading Arm (SP) Assembly so that the last tooth of the gear meets the most ins ide teeth of the Mode Gear. See Fig. 4-3-2.

Alignment 1

Triangle Marks

Loading Arm (SP) Assembly

Last T ooth

Alignment 2

Loading Arm (TU) Assembly

Most inside teeth of Mode Gear

Mode Gear

Fig. 4-3-2

Bottom View

4-12

Alignment 1

Alignment

Fig. 4-3-1

Alignment 3

Cam Gear (A), Rack Assembly

Install the Rack As s emb ly s o that th e first tooth on the gear of the Rack Assembly meets the firs t groove on the Cam Gear (A) as shown in Fig. 4-3-3.

T op Vie w

First groove on the Cam Gear (A)(HI)

Cam Gear (A)(HI)

Gear on Rack Assembly

Alignment 3

First tooth

Fig. 4-3-3

ADJUSTMENT5

5-1 PREPARATION FOR SERVICING

5-1-1 How to Enter the Service Mode

About Optical Sensors

Caution:

An optical sensor system is used for the Tape Start and End Sensors on this equipment. Carefully read and follow the instructions below. Otherwise the unit may operate erratically.

What to do for preparation

Insert a tape into the D eck Mechanis m Assembly and press the PLAY button. The tape will be loaded into the Deck Mechanism Ass embly. Make sure the power is on, connect TP507 (SENSOR INHIBITION) to (GND). This will stop the function of Tape Start Sensor, Tape End Se ns or an d Reel Sensors. (I f th ese T P s ar e connected before plu gging in the unit, the function of the sensors will stay valid.) See Fig. 5-1-1.

Note: Because the Tape End Sensors are inactive, do not run a tape all the way to the start or the end of the tape to avoid tape damage.

Q504

Q505

TP507

S-INH

Fig. 5-1-1

5-1

5-2 FIXTURE AND TAPE FOR ADJUSTMENT

1. Alignment Tape No. 7099052 (MH-2)

3. Flat Screwdriver (Purchase Locally)

2. Guide Roller Adj. Screwdriver No. 7099028

5-2-1 How To Use The Fixtures And Tape

Item No. Name Part No. Adjustment

1 Alignment Tape 7099052

2 Guide Roller Adj. Screwdriver 7099028 I G uide Roller 3 Flat Screwdriver Purchase Locally I X Value Alignment

I Head Switching Point I Tape Interchangeability Alignment

5-2

5-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS

)

General Note: "CBA" is an abbreviation for "Circuit Board Assembly."

NOTE:

1.Electrical adjus tments are required after replacing circuit components and certain mechanical parts. It is important to do these adjustments only after all repairs and replacements have been completed. Also, do not attem pt thes e adj ustmen ts unles s the proper equipment is available .

2.To per form these alignment / confirmation proce dures, make sure that the tracki ng co ntrol is set in the center position: Press either "TRACKING +5??" or "TRACKING -" button on the remote control unit first, then the "PLAY" button on the front panel.

EXT. Syncronize Trigger Point

1.0H

Figure 1

6.5H±1H

Switching Pulse

0.5H V-Syn

5-3-1 Test Equipment Required

1.Oscilloscope: Dual-trace with 10:1 probe, V-Range: 0.001~50V/Div., F-Range: DC~AC-20MHz

2.Alignment Tape (MH-2)

5-3-2 Head Switching Position

Adjustment

Purpose:

To determine the Head Switching point during playback.

Symptom of Mi sadjustm e n t:

May cause Head Switchi ng noise or vertical jitter in the picture.

Test point Adj.Point Mode Input

TP751(V-OUT)

TP502(RF-SW)

GND

Tape

VR501

(Switching Point)

(MAIN CBA)

Measurement

Equipment

PLAY

(SP)

Spec.

Reference Notes:

Playback the Alignment tape and adjust VR501 so that the V-sync front edg e of the CH1 video output waveform is at the 6.5H±1H delayed position from the rising edge of the CH2 head switching pulse waveform.

-----

MH-2 Oscilloscope 6.5H±1H

Connections of Measurement Equipment

Oscilloscop

TP751

Main CBA

GND

TP502

CH1 CH Trig. (+

5-3

5-4 MECHANICAL ALIGNMENT PROCEDURES

Explanation of alignme nt for the tape to correctly run starts on the next page. Refer to the information below on this page if a tape gets stuck , for example, in the mechanism due to some electrical trouble of the unit.

5-4-1 Service Information

A. Method for Manual Tape Loading/Unloading

To load a cassette tape manually:

1. Disconnect the AC plug.

2. Remove the Top Case and Front Assembly.

3. Insert a cassette tape. Though the tape will n ot be automatically loaded, make sure that the cassette tape is all the way in at the inlet of the Cassette Holder. To confirm this, lightly push the cassette tape further in and see if the tape c omes bac k out, by a spring motion, just as much as you have pushed in.

4. Turn the LDG Belt in the appropriate direction shown in Fig. 5-4-1 for a minute or two to com pl ete this task.

To unload a cassette tape manually:

1. Disconnect the AC plug.

2. Remove the Top Case and Front Assembly.

3. Make sure that the Moving guide preparations are in the Eject Position.

4. Turn the LDG Belt in the appropriate direction shown in Fig. 5-4-1 until the Moving gui de prepa rations come to the Eject Position. Stop turning when the preparations begin clicking or can not be moved further. However, the tape will be left wound around the cylinder.

5. Turn the LDG Belt in the appropr iate d irectio n con tinuously, and the cassette tape will be ejected. Allow a minute or two to complete this task.

B. Method to place the Cas sette Holder in the tape-

loaded position without a cassette tape

1. Disconnect the AC Plug.

2. Remove the Top Case and Front Assembly.

3. Turn the LDG Belt in the appropriate direction shown in Fig. 5-4-1. Release the locking tabs shown in Fig. 5-4-1 and c ontinue turning the LDG Belt until the Cas sette Holder comes to the tapeloaded position. Allow a mi nute or two to compl ete this task.

Top View

Moving guide T preparation (Eject Position)

Moving guide S preparation (Eject Position)

Push the tape to load it.

Push the locking tab gently to unlock when loading without a cassette.

UNLOAD /EJECT

LOAD

Side View

LDG Belt

Fig. 5-4-1

Bottom View

5-4

LDG Belt (B)

UNLOAD /EJECT

Cam Gear

Fig. 5-4-2

5-4-2 Tape Interchangeability Alignment

Note: To do these ali gn men t pr ocedures, make sure that the Tracking Control Circuit is set to the center position every time a tape is loaded or unloaded. (Refer to page 5-7, procedure 1-C, step 2.)

Equipment required:

Dual Trace Oscilloscope VHS Alignment Tape (MH-2) Guide Roller Adj. Screwdriver Flat Screwdriver (Purchase Locally)

Note: Before starting this Mechanical Alignment, do all Electrical Adjustment procedures.

lowchart of Alignment for tape traveling

Loading (Use a blank tape.)

Not good

Adjust the height of the Guide Rollers (Supply side and take-up side). (Use a blank tape.) (Page 5-6)

1-A

Check to see that the tape is not creasing and that there is no slack on the supply and take-up side Guide Rollers. (Use a blank tape.)

1-A

Adjust the X Value for maximum envelope. (Page 5-6) (Use Alignment Tape.)

Adjust the envelope. (Page 5-7)

Check the envelope.

1-B

1-C

Adjust the Audio Section. (Azimuth Alignment) (Page 5-7)

Check the audio output.

1-D

Not good

Do the final tape-traveling test to see that the tape runs normally in play mode without creasing or slacking.

1-A

Completion

Check the following:

1. X Value (Page 5-6)

2. Envelope (Page 5-7) OK

1-B, 1-C

Not good

Adjust the X value and envelope.

1-B, 1-C

5-5

1-A. Preliminary/Final Checking and

Alignment of Tape Path

Purpose:

To make sure that the tape path is well stabilized.

Symptom of Misalignment:

If the tape path is unstable, the tape will be damaged. Note: Do not use an Alignment Tape for this proce-

dure. If the unit is not correctl y aligned, the tape may be damaged.

1. Playback a blank cassette tape and check to see that the tape runs without creasing at Guide Rollers [2] and [3], and at points A and B on the le ad surface. (Refer to Fig. 5-4-3 and 5-4-4.)

2. If creasing is apparent, align the height of the guide rollers by turning the to p of Guide Rollers [2] and [3] with a Guide Roller Adj. Screwdrive r. (Ref er to Fig. 5-4-3 and 5-4-5.)

3. Check to see that the tape runs without creasi ng a t Take-up Guide Post [4] or without snaking between Guide Roller [3] and A CE Head. (Fig. 5- 4-3 and 54-5)

4. If creasing or snaking is apparent, adjust the Tilt Adj. Screw of the ACE Head. (Fig. 5-4-6)

Azimuth Adj. Screw

ACE Head

Flat Screwdriver

Tilt Adj. Screw

Fig. 5-4-6

Guide Roller [2]

Take-up Guide Post [4]

Lead Surface of Cylinder

Correct

Guide Roller

Tape

Take-up Guide Post

Tape

Guide Roller [3]

Tape

Incorrect

ACE Head

Fig. 5-4-3

Fig. 5-4-4

1-B. X Value Alignment

Purpose:

To align the Hor izontal Position of the Audio/Control/ Erase Head.

Symptom of Misalignment:

If the Horizontal Position of the Audio/Control/Erase Head is not proper ly a ligned , m ax imu m e nv el ope ca nnot be obtained at the Neutral position of the Tracking Control Circuit.

1. Connect the oscilloscope to TP301 (C-PB) and TP501 (CTL) on the Main CBA. Use TP502 (RFSW) as a trigger.

2. Playback the Gray Scale of the Alignment Tape (MH-2) and confirm that the PB FM signal is present.

3. Set the Tracking Control Circuit to the c enter position by pressing eit her "T RAC KING +5??" or "TRACKING -" button on the remote control unit first, then the "PLAY" button on the front panel. (Refer to note on bottom of page 5-7.)

4. Use the Flat Screwdriver so that the PB FM signal at TP301 (C-PB) is maximum. (Fig. 5-4-6)

5. Press "TRACKING +5??" button on the remote control unit until the CTL wavef orm has shifted by ap prox. +2ms. Make sure that the envelope is simply attenuated (shrinks in height) during this process so that you will know the envelope has been at its peak.

5-6

Fig. 5-4-5

6. Press "TRACKING -" button on th e remote control unit until the CTL waveform has shifted from its original position (no t the position achieved in step 5, but the position o f CTL waveform in step 4) by approximately -2m s. Make sure that the envelope is simply attenu ated (shrinks in height) on ce CTL waveform passes its origina l positio n and is further brought in the minus direction .

7. Set the Tracking Control Circuit to the cente r position by pressing eith er " TR ACKING +5??" or "TRACKING -" button on the remote control unit firs t, then the "PLAY" button on the front panel.

1-C. Checking/Adjustment of Envelope

Waveform

Purpose:

To achieve a satisfactory picture and precise tracking.

Symptom of Misalignment:

If the envelope output is poor, noise will appear in the picture. The tracki ng will then lose precision and the playback picture w ill be distorted by any sligh t variation of the Tracking Control Circuit.

1. Connect the oscillos cope to TP301 (C-PB) on the Main CBA. Use TP502 (RF-SW) as a trigger.

2. Playback the Gray Scale on the Alignment Tape (MH-2). Set the Tracking Control Circuit to the center position by pressing either "TRACKING +5??" or "TRACKING -" button on the remote control unit first, then the "PLAY" button on the front panel. Adjust the height of Guide Rollers [2] and [3] (Fig. 5-4-3, Page 5-6) watc hing the osci lloscope d isplay so that the envelope bec omes as flat as possible. To do this adjustment, turn the top of the Guide Roller with the Guide Roller Adj. Screwdriver.

3. If the envelope is as shown in Fig. 5-4-7, adjust the height of Guide Roller [2] (Refer to Fig. 5-4- 3) so that the waveform looks like the one sho wn in Fig. 5-4-9.

4. If the envelope is as shown in Fig. 5-4-8, adjust the height of Guide Roller [3] (Refer to Fig. 5-4- 3) so that the waveform looks like the one sho wn in Fig. 5-4-9.

5. When Guide Rollers [2] and [3] (Refer to Fig.5 -4-3) are aligned properly, there is no envelope drop either at the beginning or end of track as shown in Fig. 5-4-9.

Dropping envelope level at the beginning of track.

Dropping envelope level at the end of track.

Fig. 5-4-8

Envelope is adjusted properly. (No envelope drop)

Fig. 5-4-9

Note: Upon completion of the adjustment of Guide

Rollers [2] and [3] ( Refer to Fig. 5-4-3), check the X Value by pushing pressing either "TRACKING +5??" or "TRACKING -" button on the remote co ntrol unit al ternately, to check the symmetry of t he en velope. Chec k the number of pushes to ensu re center position. The number of pushes "TRACKING +5??" button on the remote control unit to achieve 1/2 level of envelope should match the number of pushes "TRACKING -" button on the remote control unit from center. If required, redo the “X Value Alignment.”

1-D. Azimuth Alignment of Audio/Control/

Erase Head

Purpose:

To correct the Azimuth alignment so that the Audio/ Control/Erase Head meets tape tracks proper ly.

Symptom of Misalignment:

If the position of the Audio/Control/Erase Head is not properly aligned, the Audio S/N Ratio or Frequency Response will be poor.

1. Connect the oscilloscope to the audio ou tput jack on the rear side of the deck.

2. Playback the alignment tape (MH-2) and confirm that the audio signal output level is 8kHz.

3. Adjust Azimuth Adj. Screw so that the output level on the AC Voltmeter or the waveform on the oscilloscope is at maximum. (Fig. 5-4-6)

Fig. 5-4-7

5-7

EXPLODED VIEWS AND PARTS LIST6

6-1 EXPLODED VIEWS

6-1-1 Cabinet Section

2B5

SWITCH CBA [COMPONENT REPLACEMENT]

MAIN CBA [COMPONENT REPLACEMENT]

SENSOR CBA [COMPONENT REPLACEMENT]

2B40

2B8

2B40

FUNCTION CBA [COMPONENT REPLACEMENT]

SENSOR CBA [COMPONENT

2B11

REPLACEMENT]

AC001

A1X

ABC

6-1

6-1-2 Deck Mechanism View 1 Section

B494

Mark Description

Floil G-684G or Multemp MH-D SLIDUS OIL #150

B35

(Blue grease)

B73

B10

B411

B567

L1053

B553

B410

B74

Chassis Assembly Top View (Lubricating Point)

B501

6-2

B560

B426

B121

B126

B11

B12

B571

B492

B37

Chassis Assembly Bottom View (Lubricating Point)

DEF

6-1-3 Deck Mechanism View 2 Section

Mark Description

Floil G-684G or Multemp MH-D

B587

B487

B499

B508

B573

B414

B565

B416

B574

B564

B521

B591

B520

B590

(Blue grease) SLIDUS OIL #150 SANKOUL FG84M (Yellow grease)

B522

B148

B592

B31

L1406

B558

B557

B525

B568

B417

B134

B559

B516

B52

B133

B507

B569

B488

B491

B570

B502

B513

Bottom Side (Grease point)

View for A

(Grease point)

GH I

6-3

6-1-4 Deck Mechanism View 3 Section

B347

B355

Mark Description

Floil G-684G or Multemp MH-D SLIDUS OIL #150

(Blue grease)

B482

B562

B354

B483

B425

B563

B300

B313

B529

B360

B359

B361

B555

B303

B514

JKL

6-4

6-2 REPLACEMENT PARTS LIST

6-2-1 Mechanical Parts List

SYMBOL-NO P-NO DESCRIPTION

MECHANISM SECTION

A1X TJ17401 FRONT ASSEMBLY A2 TJ17402 CASE, TOP A4 TE15411 JACK BOARD(U24)

AC001 TJ15423 AC CORD 2B5 TJ15107 SHIELD, CYLINDER 2B8 TJ15122 BUSH, LED(F) 2B11 TJ 15971 HEA TSINK 2B40 TJ17403 WASHER

B2 TJ17325 CYLINDER ASSEMBLY B3 TS18413 LOADING MOTOR ASSEMBLY B8 TS18414 PULLEY ASSEMBLY B9 TJ16892 MOVING GUIDE (S) B10 TJ16893 MOVING GUIDE (T)

B11 TJ16894 LOADING ARM(TU) B12 TJ16895 LOADING ARM(SP) B31 TS18415 AC HEAD B35 TS18416 TAPE GUIDE ARM B37 TS18417 CAPSTAN MOTOR

B52 TJ15161 CAP BELT B73 TS17449 FE HEAD B74 TJ15163 PRISM B121 TJ16896 WORM B126 TJ17196 PULLEY

SYMBOL-NO P-NO DESCRIPTION

B494 TJ16915 CASSETTE DOOR OPENER B499 TJ16916 LEVER HOLDER(T) B501 TJ16917 WORM HOLDER B502 TJ16918 CAM GEAR(B) B507 TJ14034 WASHER

B508 TJ15199 BRAKE SPRING(S) B513 TJ16919 CAM WASHER B514 TJ15202 SCREW RACK B516 TJ14034 REEL WASHER B520 TJ16921 BRAKE SPRING

B521 TJ16922 BRAKE SPRING B522 TS17454 POST ASSEMBLY B525 TJ16001 BELT B529 TJ15106 CLEANER ASSEMBLY B553 TJ16003 SPRING

B555 TS18422 RACK ASSEMBLY B557 TJ15215 MOTOR PULLEY B558 TJ16923 LOADING MOTOR B559 TS18423 CLUTCH ASSEMBLY B560 TJ15303 KICK SPRING

B562 TJ16924 C DRIVE LEVER(SP) B563 TJ16925 SLIDER SHAFT B564 TJ16926 GEAR(M) B565 TJ16927 SENSOR GEAR B567 TJ16928 PINCH ARM(B)

B133 TJ16898 IDLER GEAR B134 TJ16899 IDLER ARM B148 TJ15984 TG CAP B300 TJ16901 CASSETTE DRIVE LEVER(TU) B303 TJ16902 DOOR OPENER

B313 TJ16903 CASSETTE DRIVE SPRING B347 TJ15987 GUIDE HOLDER A B354 TJ17197 SLIDER(TU) B355 TJ17308 SLIDER(SP) B359 TJ15103 CLEANER LEVER

B360 TJ15104 CLEANER ROLLER B361 TJ15105 POST B410 TJ17309 PINCH ARM B411 TJ16906 PINCH SPRING B414 TS18419 BRAKE(SP)

B416 TS18421 BRAKE(TU) B417 TJ16944 TENSION SPRING B425 TJ15185 LOCK LEVER SPRING B426 TJ15186 KICK PULLEY B482 TJ16908 CASSETTE PLATE

B483 TJ16909 LOCK LEVER B487 TJ16911 BAND BRAKE(SP) B488 TJ16912 MODE LEVER B491 TJ16913 CAM GEAR B492 TJ16914 MODE GEAR

B568 TJ16929 BT ARM B569 TJ17417 CAM HOLDER(F) B570 TJ16035 CAM RACK SPRING(HI) B571 TJ15203 WASHER B573 TJ16931 REEL(SP)

B574 TJ16932 REEL(TU) B587 TS18424 TENSION LEVER ASSEMBLY B590 TJ17202 BRAKE ARM(TU) B591 TJ16935 BAND BRAKE(TU) B592 TJ16936 TG POST

L1406 TJ15238 SCREW

ACCESSORIES

X1 TS18613 REMOTE CONTROL UNIT

X3 TJ14683 RF CORD X6 TE14751 AV CABLE

6-5

6-2-2 Electrical Parts List

Note: Although some parts in the schematic diagrams have different names from those in

the parts list, there is no problem in replacing parts.

SYMBOL-NO P-NO DESCRIPTION

RESISTOR

VR501 TA14561 CARBON P.O.T. 100K OHM B

SEMI-CONDUCTORS

D502 TJ13898 LED SIR-563ST3F P D561 TJ15414 LED(RED) 204HD/E D562 TJ15414 LED(RED) 204HD/E D563 TJ15414 LED(RED) 204HD/E D564 TJ15414 LED(RED) 204HD/E

IC001 TE13224 PHOTOCOUPLER LTV-817B-F IC301 TJ15415 IC LA71584M IC501 TJ17408 IC M37762MCA-AB2GP IC503 TJ15418 IC BR24C01AF-W Q001 TJ17301 FET 2SK3566

RS501 TS17691 REMOTE RECEIVER MIM-93M9DKF

TRANSFORMER

T001 TJ17412 SWITCHING TRANSFORMER

COILS

SYMBOL-NO P-NO DESCRIPTION

L003 TJ17298 LINE FILTER 56MH L008 TA12575 BEAD CORE

CRYSTALS

X301 TJ15145 X'TAL 3.579545MHZ(20PPM) X302 TJ14708 X'TAL 4.433619MHZ X501 TE15284 X'TAL 12.000 MH Z

MISCELLANEOUS

CN651 TJ15147 ANGLE PIN HEADER, 3P

F001 TJ14705 FUSE T1.6AL/250V FH001 TE11084 FUSE HOLDER FH002 TE11084 FUSE HOLDER

J901 TA12575 BEAD CORE JK751 TE13042 RCA JACK JK752 TE13042 RCA JACK JW001 TE15239 FLAT CABLE, 2P MD701 TE15413 RF MODULATOR(PAL-G/K) MDLW3E009A

SW506 TE15484 LEAF SWITCH SW507 TE15485 ROTARY MODE SWITCH SW509 TE11957 TACT SW ITCH SW513 TE11957 TACT SW ITCH SW651 TE11957 TACT SW ITCH

6-6

SW652 TE11957 TACT SW ITCH SW653 TE11957 TACT SW ITCH SW654 TE11957 TACT SW ITCH SW655 TE11957 TACT SW ITCH SW656 TE11957 TACT SW ITCH

SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAMS

1 WIRING DIAGRAMS

AC CORD

(DECK ASSEMBLY)

ACE HEAD ASSEMBLY

AUDIO

ERASE HEAD

AUDIO HEAD

CONTROL HEAD

FE HEAD

FULL ERASE HEAD

CYLINDER ASSEMBLY

PG SENSOR

DRUM MOTOR

MOTOR

VIDEO IN

AUDIO IN

VIDEO OUT

AUDIO OUT

SENSOR CBA

CL504

AE-H

AE-H/FE-H2 A-COM3 A-PB/REC4 CTL(+)5

CTL(-)

CL501

FE-H GND

FE-H

CL508

1 POWER

JW001

2 GND

SENSOR CBA

SWITCH CBA

CAPSTAN MOTOR

MLOADING

CAPSTAN MOTOR

CL502

1 AL+12V(3)

AL+5V(3)

2 3 C-FG 4

C-F/R C-CONT5 GND

LM-FWD/REV

D-CONT8 D-PFG9 GND

AL+12V(2)

P-ON+15V12

MAIN CBA

VIDEO (R) HEAD

VIDEO (L) HEAD

CL253 V(R)1 V-COM2

3 V(L)

KEY-2

GND

3 3

KEY-1

CN651CN505 1 2

FUNCTION CBA

2 SCHEMATIC DIAGRAMS

2-1 Main 1/4 Schematic Diagram

2-2 Main 2/4 & Sensor & Switch Schematic Diagrams

2-3 Main 3/4 Schematic Diagram

2-4 Main 4/4 Schematic Diagram

CAUTION !

For continued protection against fire hazard, replace only with the same type fuse.

NOTE :

The voltage for parts in hot circuit is measured using hot GND as a common terminal.

CAUTION !

Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. If Main Fuse (F001) is blown, check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.

2-5 Function Schematic Diagram

3 WAVEFORMS

WF2

WF1

WF3

WF1

UPPER

(TP301 of Main CBA)

LOWER

(TP504 of Main CBA)

C-PB 10mV x 10 RF-SW 0.5V x 10

5msec

UPPER

(TP751 of Main CBA)

LOWER

(TP504 of Main CBA)

V-OUT 0.1V x 10 RF-SW 0.5V x 10

50usec

WF3

(TP751 of Main CBA)

V-OUT E-E

10usec 50mV x 10

4 CIRCUIT BOARD DIAGRAMS

4-1 Main & Sensor CBA Top View

CAUTION !

For continued protection against fire hazard, replace only with the same type fuse.

NOTE :

The voltage for parts in hot circuit is measured using hot GND as a common terminal.

WF1

TP751 V-OUT

CAUTION !

Sensor CBA Top View

BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED. ALSO , IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT SLOWLY , WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY CIRCUIT , A VARIABLE ISOLATION TRANSFORMER IS REQUIRED.

WF3

TP301

C-PB

WF2

TP502

RF-SW

VR501

SW-P

TP501

CTL

TP507

S-INH

4-2 Main CBA Bottom View

CAUTION !

For continued protection against fire hazard, replace only with the same type fuse.

NOTE :

The voltage for parts in hot circuit is measured using hot GND as a common terminal.

CAUTION !

NOTE :

Red letters indicate additional parts on the copper side.

J205

C553

4-3 Function & Switch CBA Top/Bottom View

Function CBA Top View

Function CBA Bottom View

Switch CBA Top View

Switch CBA Bottom View

5 BLOCK DIAGRAMS

5-1 Servo/System Control Block Diagram

Q505

ST-S

SENSOR CBA

Q504

END-S

SENSOR CBA

(DECK ASSEMBLY)

AC HEAD ASSEMBLY

CONTROL HEAD

CL504

5CTL(+) 6CTL(-)

MAIN CBA

TP505

END-S

Q503

T-REEL

AL+5V

D502 S-LED

SW507 LD-SW

RS501

REMOTE SENSOR

TP501

CTL

AL+5V

IC501

(SERVO/SYSTEM CONTROL)

ST-S

END-S

T-REEL

REMOCON-IN

LD-SW9

CTL(+)

CTL(-)

CTL AMP OUT

POWER-LED POWER-LED

REPEAT-LED REPEAT-LED REPEAT-LED

REC-LED 27

REC-LED 28

REC-SAF-SW 31

KEY-1

KEY-2

23 24

25 26

TP507 S-INH

KEY SWITCH

AL+5V

SW506

REC-SAFETY

3 3KEY-1

D562 POWER

D561 STAND-BY

D563 REPEAT

D564 REC

SCL

SDA

MD701

SCL SDA

FUNCTION CBA

CN651CN505

KEY SWITCH KEY SWITCH1 1KEY-2

(MEMORY)IC503

CYLINDER ASSEMBLY CAPSTAN MOTOR

PG SENSOR

DRUM MOTOR

CAPSTAN MOTOR

MLOADING

MOTOR

CL502

1 AL+12V(3)

AL+5V(3)

2 3 C-FG 4

C-F/R C-CONT5

GND

LM-FWD/REV

D-CONT8 D-PFG9 GND

AL+12V(2)

P-ON+15V12

AL+12V(3) AL+5V(3)

AL+12V(2) P-ON+15V

AL+5V

VR501 SW-POINT

C-FG

C-F/R

C-CONT

LM-FWD/REV

D-CONT77 D-PFG

PG-DELAY

A-MUTE-H

D-REC-H

C-SYNC

D-V SYNC

IIC-BUS SCL

IIC-BUS SDA

V-ENV

C-ROTA

RF-SW

P-OFF-H

RESET

83 33

58 13

71 72

15 18

73 34

A-MUTE-H

D-REC-H

IIC-BUS SCL

IIC-BUS SDA

D-REC-H

C-SYNC

D-V SYNC

IIC-BUS SCL

IIC-BUS SDA

V-ENV

C-ROTA

RF-SW

P-OFF-H

RESET

TO AUDIO BLOCK

TO VIDEO BLOCK

TO POWER SUPPLY BLOCK

5-2 Video Block Diagram

REC-VIDEO SIGNAL PB-VIDEO SIGNAL MODE: SP/REC

MD701

VIDEO IN

JK751 V-OUT

JK752 V-IN

TP751

V-OUT

WF1

BUFFER

Q305

TP754

V-IN

IC501 (OSD)

OSD CHARACTER

MIX

COLOR

-IN

X301

3.58MHz

MAIN CBA

X302

4.43MHz

IC301

Y/C MIX

63 64

VXO

1/2

NOISE

CANCELMDE EMPA

PIC-CTL

ANR

VXO

Y-LPF

(Y/C PROCESS) 29 67 66 49

AMP

FBC

32 31

AGC

R P

Q307

BUFFER

CCD 1H

DELAY

DOC YNR Y/C COMB

46 41

CLAMP

Q304

BUFFER

CLAMP

DETAIL

ENH

W/D CLIP

21 24 2320

R P

MOD

SERIAL

DECORDER

V/I

CONV

REC

FM-EQ

IIC-BUS SDA

IIC-BUS SCL

SUB

DEMOD.

LPF

FROM/TO SERVO/SYSTEM CONTROL BLOCK

DOUBLE

LIMIT

EMPHA

Q302, Q303

PEAKING AMP

FROM/TO SERVO /SYSTEM CONTROL BLOCK

(DECK ASSEMBLY)

VIDEO (R)-1 HEAD

VIDEO (L)-1 HEAD

D-REC-H C-SYNC D-V SYNC

BUFFER

Q308

D-REC-H

C-SYNC

D-V SYNC

1 2 3

CL253

V(R) V-COM V(L)

R P

BPF

D.E.

KIL

C-COMB COMB

AMP

72715759 54 52 51 61

BPF

MAPBPF

KILL B.D.

CCD

LPF

R P

ACC

4.43MHz

B-UP

AMP

MAIN

CONV

SUB

CONV

629KHz

REC FM

C-LPF

AGC

C-ROTA

PB FM

AGC

10 93 11

FM-EQ

C-ROTA

V-ENV

RF-SW

FROM/TO SERVO/SYSTEM

CONTROL BLOCK R L

ENV DET

TP502

RF-SW

WF2

CYLINDER ASSEMBLY

TP301

C-PB

WF3

5-3 Audio Block Diagram

MD701

PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC

MAIN CBA

JK751 A-OUT

JK752 A-IN

(DECK ASSEMBLY)

ACE HEAD ASSEMBLY

AUDIO IN

TP752

A-OUT

IC301

(AUDIO PROCESS) 76

PB-ON 4 3

EQ AMP

SP/LP-ON

100

ALC

LINE AMP

MUTE

ALC DET

AUDIO HEAD

AUDIO ERASE HEAD

FULL ERASE HEAD

FE HEAD

CL504 4 A-PB/REC 3 A-COM 1 AE-H 2 AE-H/FE-H

CL501 2 FE-H 1 FE-H-GND

Q402

BIAS OSC

Q405 (PB=ON)

Q403

Q401

AL+5V(3)

SWITCHING D-REC-OFF

AL+5V(3)

AUTO BIAS

REC AMP

D-REC-H

1030

SERIAL

DECODER

23 24

IIC-BUS SDA IIC-BUS SCL

A-MUTE-H

D-REC-H

TO SERVO/SYSTEM CONTROL BLOCK

5-4 Power Supply Block Diagram

AC001

NOTE : The voltage for parts in hot circuit is measured using hot GND as a common terminal.

HOT CIRCUIT. BE CAREFUL.

F001 T1.6A L 250V

L003

LINE FILTER

D001 - D004

BRIDGE RECTIFIER

CAUTION

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE T1.6AL/250V FUSE.

T001

CAUTION !

Fixed voltage (or Auto voltage selectable ) power supply circuit is used in this unit. If Main Fuse (F001) is blown, check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.

MAIN CBA

P-ON+15V AL+12V(3) AL+12V(2) AL+5V(3) TIMER+5V AL+5V(1) AL+12V(1) RESET P-OFF-H

Q003

Q002

Q001

IC001

ERROR VOLTAGE DET

Q056

HOT

COLD

REG

Q004

(SHUNT REGULATOR)

6 SYSTEM CONTROL TIMING CHARTS

Mode SW : LD-SW

LD-SW Position detection

A/D Input voltage Limit

(Calculated voltage)

3.76V~4.50V (4.12V)

4.51V~5.00V (5.00V)

0.00V~0.25V (0.00V)

1.06V~1.50V (1.21V)

0.66V~1.05V (0.91V)

1.99V~2.60V (2.17V)

1.51V~1.98V (1.80V)

3.20V~3.75V (3.40V)

0.26V~0.65V (0.44V)

4.51V~5.00V (5.00V)

2.61V~3.19V (2.97V)

Symbol

Note:

EJ RS: Loading FWD (LM-FWD/REV “H”) RS EJ: Loading REV (LM-FWD/REV “L”)

Stop (A) = Loading Stop (B) = Unloading

Note:

Symbol Loading Status

EJ Eject CL Eject ~ REW Reel SB REW Reel ~ Stop(B)

TL Stop(B) ~ Brake Cancel FB Brake Cancel ~ FF / REW SF FF / REW ~ Stop(M), (FF / REW)

SM Stop(M), (FF / REW) ~ Stop(A)

AU Stop(A) ~ Play / REC

AL Play / REC ~ Still / Slow SS Still / Slow ~ RS (REW Search) RS RS (REW Search)

1. EJECT (POWER OFF) -> CASSETTE IN (POWER ON) -> STOP(B) -> STOP(A) -> PLAY -> RS -> FS -> PLAY -> STILL -> PLAY -> STOP(A)

D R

ST-S/

END-S

"OFF"

PAUSE

PLAY

REW

PLAY

PAUSE

OFF

PAUSE

OFF

PLAY

STOP

/EJECT

LD-FWD

0.3s

LD-REV

PLAY

0.2s

STOP(A)

20ms

LD-FWD

0.2s

0.3s

0.8s

0.7s

0.2s

1.2s

LD-FWD

0.2s

0.4s

PIN NO.

LD-SW

CL/SS EJ AU RS SF SM TL FB AL SB

1 M-FWD "M"

/REV

C-DRIVE

C-F/R

RUM OTATION

P-ON

A-MUTE-H

CA DATA

EJECT

"Z"

0.2s

REC EE

CASS.LOAD

CLEJ

0.2s

LD-FWD

TL SB

0.2s

0.8s

LD-REV

0.2s

LD-FWD

LD-REV

0.5s

SMAL AL RS AU AL SM

0.4s

40ms

0.2s

LD-FWD

1.0s

PLAY

STILL

NOISE

CANCEL

>5.0s 5.0s

LP/SLP MODE

SP MODE

6ms 6ms160ms80ms

NOISE

CANCEL

STILL

1.0s

0.3s

0.2s

LD-REV

PLAY

0.4s

40ms

0.8s

STOP(A)

0.2s

20m

Fig. 5

D-REC-H

DISPLAY

POWER

-OFF

STOP

PLAY RS

PLAY STOPPLAY

STILL

D R

2. STOP(A) -> FF -> STOP(A) -> REW -> STOP(A) -> REC -> PAUSE -> PAUSE or REC -> STOP(A) -> EJECT

STOP

STOP(A)

0.2s

20ms

/EJECT

LD-REV

0.2s

LD-REV

0.5s

0.1s

0.2s

0.5s

ST-S/

END-S

CASS. UNLD

"ON"

EJECT

Fig. 6

STOP

LD-FWD

/EJECT

LD-REV

0.5s

2.5s

LD-FWD

AU AU

0.4s

40ms

STOP(A)

0.2s

20ms

REW

LD-REV

0.2s

STOP(A)

PIN NO.

LD-SW

CL/SS EJ AU RS SF SM TL FB AL SB

1 M-FWD "M"

/REV

"Z"

C-DRIVE

C-F/R

RUM OTATION

P-ON

A-MUTE-H

CA DATA

D-REC-H

REC EE

LD-REV

FB FB SFSF SM SMAL AL SM AL AL ALAU AU SM TL SB EJRS RSSM

SM SF AU AU SS

0.2s

LD-FWD

REW

STOP

/EJECT

LD-FWD

2.5s

LD-FWD

0.5s

0.4s

40ms

LD-REV

STOP(A)

0.2s

20ms

REC

1.0s

LD-FWD

REC

0.2s

STOP

/EJECT

REC or

0.2s

LD-FWD

REC PAUSE

1.2s

PAUSE

REC

LD-FWD

1.0s

LD-REV

0.2s

LD-FWD

0.5s

0.4s

40ms

LD-REV

PAUSE

LD-FWD

LD-REV

2.5s Short REV

AL AL AUSS FB CL

SS SS SF

DISPLAY

STOP

STOPFF

REW STOP

REC

RECREC PAUSE STOP

7 IC PIN FUNCTION DESCRIPTIONS

IN/

No.

IC501( SERVO / SYSTEM CONTROL IC )

“H” ≥ 4.5V, “L” ≤ 1.0V

IN/

No.

OUT

2IN

3IN

4IN 56IN

7IN

8IN

9IN

10 IN 11 -

12 13 OUT

14 IN

15 OUT 16 -

17 18 OUT 19 20 OUT 21 -

22 23 OUT

24 OUT

Signal

Name

NU Not Used

PG-DELAY

POW-SAF

END-S NU Not Used V-ENV

KEY-1

KEY-2

LD-SW

ST-S NU Not Used

NU Not Used D-V- SYNC REMOCO

N-IN C-ROTA NU Not Used

NU Not Used RF-SW NU Not Used

REPEATLED

NU Not Used NU Not Used POWER-

LED POWER-

LED

Function

Video Head Switching Pulse Signal Adjusted Voltage

P-ON Power Detection Input Signal

Tape End Position Detect Signal

Video Envelope Comparator Signal

Key Scan Input Signal 1

Key Scan Input Signal 2

Deck Mode Position Detector Signal

Tape Start Position Detector Signal

Dummy V-sync Output

Remote Control Sensor

Color Phase Rotary Changeover SIgnal

Video Head Switching Pulse

“REPEAT” LED Signal Output

“POWER” LED Signal Output

Active

Level

A/D

Hi-z

H/L

OUT

25 OUT

26 OUT

OUT REC-LED

29 30 -

31 IN

32 33 OUT

34 IN 35 -

36 37 38 IN 39 OUT 40 41 42 43 IN

44 IN

45 OUT 46 -

47 48 IN 49 -

50 IN 51 52 OUT 53 -

54 -

Signal

Name

REPEATLED

NU Not Used NU Not Used

REC-SAFSW

NU Not Used D-REC-H

RESET NU Not Used

NU Not Used Vcc Vcc Xin Main Clock Input Xout Main Clock Input Vss Vss(GND) NU Not Used NU Not Used CLKSEL Clock Select (5V)

OSC

OUT

NUB Not Used LP LP FSC-IN

[4.43MHz ] OSDVss OSDVss V-IN Video Signal Input NU Not Used V-OUT Video Signal Output OSDVcc OSDVcc

HLF

Function

“REPEAT” LED Signal Output

“REC” LED Signal Output

Recording Safety SW Detect (With Record tab="L"/With out Record tab="H")

Delayed Record Signal

System Reset Signal (Reset=”L”)

Clock Input for letter size

Clock Output for letter size

4.43MHz Clock Input

LPF Connected Terminal (Slicer)

Active

Level

No.

IN/

OUT

Signal

Name

55 IN COLOR-IN

56 57 -

58 IN 59 -

60 61 62 63 64 65 66 67 68 69 70 -

71 OUT

72 73 OUT

74 75 -

76 OUT

77 OUT

78 OUT

79 80 IN

81 OUT 82 83 OUT 84 -

85 86 -

NU Not Used NU Not Used

C-SYNC NU Not Used

NU Not Used NU Not Used NU Not Used NU Not Used NU Not Used NU Not Used NU Not Used NU Not Used NU Not Used NU Not Used NU Not Used

IIC BUSSCL

IN/

IIC BUSSDA

OUT

P-OFF-H Power Off at High NU Not Used NU Not Used

C-CONT

D-CONT

C-F/R

NU Not Used T-REEL LM-FWD/

REV NU Not Used

A-MUTE-H NU Not Used

NU Not Used NU Not Used

Function

SECAM or MESECAM Chroma Video Input Signal at Super Impose

Composite Synchronized Pulse

C BUS Control

Clock

C BUS Control

Data

Capstan Motor Control Signal

Drum Motor Control Signal

Capstan Motor FWD/ REV Control Signal (FWD=”L”/REV=”H”)

Take Up Reel Rotation Signal

Loading Motor Control Signal

Audio Mute Control Signal (Mute = “H”)

Active

Level

Z/L

PULSE

H/L

PWM

H/L

PULSE

H/L/

Hi-z

No.

IN/

OUT

Signal

Name

Function

Capstan Motor

87 IN

C-FG

Rotation Detection

Pulse 88 89 -

90 IN

91 -

92 93 94 OUT

95 OUT

96 -

97 98 -

NU Not Used NU Not Used

D-PFG AMPVREF

OUT AMPVREF

Drum Motor Phase/

Frequency Generator

V-Ref for CTL AMP

P80/C P80/C Terminal CTL (-)

CTL (+)

AMPC CTLAMP

out

Playback/Record

Control Signal (-)

Playback/Record

Control Signal (+)

CTL AMP Connect ed

Terminal

To Monitor for CTL

AMP Output

AMPVcc AMPVcc

A/D Converter Power 99 -

AVcc

Input/ Standard

Voltage Input

100 -

NU Not Used

Notes:

Abbreviation for Active Level:

PWM -----Pulse Wide Modulation A/D--------Analog - Digital Converter

Active

Level

PULSE

H/L

PULSE

8 LEAD IDENTIFICATIONS

E C B

BR24C01AF-W CAT24WC01JI

BN1F4M-T KTA1266(GR) KTC3199(Y,GR,BL) 2SC2785(J.H.F.K) KRA103M

KTA1267(Y,GR) 2SA1175(J,H,F)

QSZAA0RMB146 LA71584M

E C B

2SC1815-Y(TPE2) 2SC1815-GR(TPE2) 2SC2120-Y(TPE2) KTC3203(Y) 2SC1815-BL(TPE2) 2SA1015-GR(TPE2)

LTV-817(B,C)-F

C E

RN1511(TE85R) FMG4A T148

C1 C2

B1 E B2

PT204-6B-12 MID-32A22

100

KTC3875Y-RTK KTC3879Y-RTK

2SK3566

Note:

A: Anode K: Cathode E: Emitter C: Collector B: Base R: Referenc

S: Source G: Gate D: Drain

VT-P298GK

No. 5303ETK Digital Media Division, Tokai

Hitachi vt-p298gk Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

CAUTIONS FOR SAFETY IN PERFORMING REPAIR

1-1 IMPORTANT SAFETY PRECAUTIONS

1-1-1 Product Safety Notice

1-1-2 Precautions during Servicing

1-1-3 Safety Check after Ser vicing

1-2 STANDARD NOTES FOR SERVICING

1-2-1 Circuit Board Indications

1-2-2 Instructions for Connectors

1-3 NOTES WHEN USING SERVICE MANUAL

GENERAL INFORMATION2

2-1 SPECIFICATIONS

2-2 FEATURES

2-3 COMPARISON OF MODELS

2-3-1 Comparison of Features ←: Same as on left

2-3-2 Comparison of Main Control ICs ←: Same as on left

2-4 MECHANICAL TROUBLE INDICATOR

– FRONT VIEW –

2-5 OPERATING CONTROLS AND FUNCTIONS

– REAR VIEW AND TERMINALS –

MAINTENANCE AND INSPECTION3

3-1 TROUBLESHOOTING

3-2 STANDARD MAINTEN ANCE

3-2-1 Service Schedule of Components

3-2-2 Cleaning

DISASSEMBLY 4

4-1 CABINET DISASSEMBLY INSTRUCTIONS

4-1-1 Disassembly Flowchart

4-1-2. Disassembly Method

4-3 ALIGNMENT PROCEDURES OF MECHANISM

ADJUSTMENT5

5-1 PREPARATION FOR SERVICING

5-1-1 How to Enter the Service Mode

5-2 FIXTURE AND TAPE FOR ADJUSTMENT

5-2-1 How To Use The Fixtures And Tape

5-3 ELECTRICAL ADJUSTMENT INSTRUCTIONS

5-3-1 Test Equipment Required

5-4 MECHANICAL ALIGNMENT PROCEDURES

5-4-1 Service Information

5-4-2 Tape Interchangeability Alignment

1-B. X Value Alignment

EXPLODED VIEWS AND PARTS LIST6

6-1 EXPLODED VIEWS

6-1-1 Cabinet Section

6-1-2 Deck Mechanism View 1 Section

6-1-3 Deck Mechanism View 2 Section

6-1-4 Deck Mechanism View 3 Section

6-2 REPLACEMENT PARTS LIST

6-2-1 Mechanical Parts List

6-2-2 Electrical Parts List

SCHEMATIC, CIRCUIT BOARD AND BLOCK DIAGRAMS

1 WIRING DIAGRAMS

2 SCHEMATIC DIAGRAMS

2-1 Main 1/4 Schematic Diagram

2-2 Main 2/4 & Sensor & Switch Schematic Diagrams

2-3 Main 3/4 Schematic Diagram

2-4 Main 4/4 Schematic Diagram

2-5 Function Schematic Diagram

3 WAVEFORMS

4 CIRCUIT BOARD DIAGRAMS

4-1 Main & Sensor CBA Top View

4-2 Main CBA Bottom View

4-3 Function & Switch CBA Top/Bottom View

5 BLOCK DIAGRAMS

5-1 Servo/System Control Block Diagram

5-2 Video Block Diagram

5-3 Audio Block Diagram

5-4 Power Supply Block Diagram

6 SYSTEM CONTROL TIMING CHARTS

1. EJECT (POWER OFF) -> CASSETTE IN (POWER ON) -> STOP(B) -> STOP(A) -> PLAY -> RS -> FS -> PLAY -> STILL -> PLAY -> STOP(A)

2. STOP(A) -> FF -> STOP(A) -> REW -> STOP(A) -> REC -> PAUSE -> PAUSE or REC -> STOP(A) -> EJECT

7 IC PIN FUNCTION DESCRIPTIONS

8 LEAD IDENTIFICATIONS