DAEWOO DVN-14F6N, DVN-20F6N Service Manual

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Page 1

Service Manual

TV/VCR IN ONE BOARD

CHASSIS : CN-140

NTSC-M SYSTEM

MODEL : DVN-14F6N

DVN-20F6N

DAEWOO ELECTRONICS CO., LTD.

✔

Caution

: In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

Page 2

CONTENTS

Specifications .................................................................................................. 1

Satety Checking After Servicing .................................................................... 2

1. Insulation resistance test

2. Dielectric strength test

3. Clearance distance

4. Leakage current test

Important Service Notes ................................................................................. 3

1. X-RAY radiation precaution

2. Safety precaution

3. Product safety notice

4. Service notes

General Adjustment ........................................................................................ 4

1. General

2. Vertical height adjustment

3. Focus adjustment

4. RF AGC adjustment

5. High voltage check

6. X-RADIATION protection circuit test

7. White valance adjustment

8. Convergence magnet assembly positioning

Leadless(chip) Instruction &

Cleaning and rubrication of deck mecanism ................................ 7

1. Leadless(chip) component removal instruction

2. Leadless(chip) component identification

3. Cleaning and rubrication of deck mechanism

Mechanical disassembly(DECK) .................................................................... 9

1. Top view

2. Bottom view

3. F/L mechanism view

4. General removal view

5. Mechanical checks/Gear alignment

6. Tention checks

Mechanical Adjustments ............................................................................... 22

Shape & Equipment of DVN-14/20F6N ......................................................... 24

1. DVN-14F6N/DVN-20F6N

2. Panel view

3. Remote controller

Electrical Adjustments ................................................................................... 29

1. Servo

2. Audio

3. Video

Page 3

Signal Flow ..................................................................................................... 35

1. Video & Audio

2. Power circuits

3. Deflection circuits

4. U-COM circuits

5. Channel selection and memory

6. Servo/Syscon circuit operation

7. Normal audio circuit operation

8. Video circuit operation

Important IC

¡¡ﬂﬂ

s Operation .............................................................................. 43

1. IY03(LA7411)

2. IY02(LC89960)

3. IY01(LA7423A)

4. IU01(BA7790LS)

5. IN05(BA6209)

6. IN03(MC4558C)

7. I503(TC4066BP)

8. I301(TA8445K)

9. IN01(Syscon:TMP91C642AN-3178)

10. I701(Timer:M37267M6-101SP)

11. I501(Chroma IC:M52335SP-600)

Important Signal WaveForms ....................................................................... 80

Troubleshooting According to

Cause & Symptom ................................................................................. 83

1. Power supply unit

2. Vertical, horizontal unit

3. Servo/Syscon unit

4. Video unit

5. Audio unit

Electrical Parts List ..................................................................................... 100

1. Standard part number coding

2. Parts list

Block Diagram ............................................................................................. 128

Connection Diagram ................................................................................... 129

Schematic Diagram ..................................................................................... 130

Printed Circuit Boards ................................................................................ 135

Exploded View ............................................................................................. 138

Page 4

Format : VHS standard Playback System : 2 rotary heads, helical

scanning system Luminance : FM azimuth

recording

Color Signal :Converted

sub-carrier phase shift

recording Video Signal System : NTSE-type color signal' Audio Track : 1 track Tape Width : 12.65 mm (1/2 inch) Tape Speed : (SP) : 33.35 mm/s (1.5/16 ips)

(LP) : 16.67mm/s (21/32 ips) (SLP) : 11.12 mm/s (7/16 ips)

Maximum Recording Time

: (SLP) : 480min. with T-160

Videocassette Power Source : 120V AC, 60Hz Power Consumption : (14") : 60W

(20") : 75W Input Level : Video : VIDEO IN jack(RCA)

1.0Vp-p, 75Ω unbalanced

Audio : AUDIO IN jack (RCA)

-3.8dBm. over 100K OHM unbalanced

TV Tuner : VHF input CH2-CH13

Cable channels "A" - "W" 75Ω unbalanced UHF input CH14-CH 69

Video Horizontal Resolution : More than 220 lines

Audio Frequency : SP : 100 Hz-10KHz

LP : 100Hz-7KHz SLP : 100Hz-5KHz

Signal-to-Noise Ratio : Video : better than 43 dB (SP)

Audio : better than 36 dB (with TV) Operating Temperature : 5°C-40°C Weight : (14") : 17Kg/(20") : 25Kg Dimensions : (14") : 379x402

x369

(20") : 498x495x464 Provided Accessories : Remote control unit

Picture Tube : (20"/14") A48JLL40x02

A34JLL40x01

Sound Output Power : Above 1.2W non distortion/

SPEAKER

* Design and apecifications are subject to change without

notice. our legal obligations.

■■

SPECIFICATIONS

Page 5

• Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specfied values in order to verify compliance with safety satandards.

1. Insulation resistance test

Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). See table below.

2. dielectric strength test.

Confirm specified dielectric or strength or greater between power cord plug prongs and exposed accessible parts of the set(RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) See table below.

3. Clearance distance

When replacing primary circuit components, confirm speckfied clearance distance (d), (d") between soldered terminals, and between terminals and surrounding metalic parts. see table below.

Table 1 : Rating for selected areas

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

locality.

4. Leakage current test

confirm 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.)

Measuring Method : (Power ON) Insert load Z between B (earth ground, power cord plug prongs) and exposed accessible parts. Use and AC voltmeter to measure across both terminals of load Z. See figure and following table.

Table 2 : Leakage current ratings for selected areas

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

locality.

AC Line Voltage Region

Insulation Dielectric Clearance

Resistance Strength Distance (d), (d')

100V Japan ≥1MΩ500 V DC 1kV 1 minute ≥3 mm

110 to 130V USA & Canada --- 900V 1 minute ≥3.2mm

≥6mm(d)

* 100 to 250V South America ≥10 MΩ/500 V DC 4 kV 1 minute ≥8mm(d')

(z:Power cord)

AC Line Voltage Region Load Z Leakage Current (i)

Earth Ground

(B) to :

100V Japan i ≤ 1mA rms Exposed accessible parts

110 to 130 V USA & Canada i ≤ 0.5 mA rms Exposed accessible parts

100 to 130 V South America

i ≤ 0.7 mA peak

Antenna earth terminals

i ≤ 2mA dc

200 to 250 V

i ≤ 0.7 mA peak

Other terminals

i ≤ 2mA dc

Fig. 1

Fig. 2

1kΩ

2kΩ

50kΩ

1.5kµF

1.5kΩ

Page 6

1. X-RAY RADIATION PRECAUTION

1)Excessive high voltage can produce potentially hazardous X-RAY RADIATION to avoid such hazards, the high voltage must not be above the specified limit. The nominal value of the high voltage of this receiver is

24.4kv (27.5kv) at zero beam current (mininum brighrness) under a 120V AC power source. The high voltage must not, under any circumstance, exceed 27kv (28.5kv). Each time a receiver requires servicing, the high voltage should be checked following the HIGH VOLTAGE CHECK procedure on page 4 of this manual. It is recommend as parts of the servuce record. It is important to use an accurate and reliable high voltage meter.

2) This receiver is equipped with X-RADITION PROTECTION circuit which prevents the receiver from producing an excessively high voltage even of the B+ vlotage increases abnormally. Each time the receiver is serviced, X-RADIATION PROTECTION circuit must be checked to determine that the circuit is properly functioning, following the X-RADIATION PROTETION CIRCUIT CHECK procedure on page 4 of this manual.

3) The only source of X-RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION PROTECTION, the replacement tube must be exactly the same type tube as specified in the parts list.

4) Some parts in the receiver have special safety-related characteristics for X-RAY RADIATION PROTECTION. for continued safety, parts replacement should be undertaken only after referring to the PRODUCT SAFETY NOTICE below.

2. SAFETY PRECAUTION

WARNING : Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver. The following are the necessary precaution to be observed before servicing.

1) Since the chassis of this receiver has hazardous potential to ground whenever to receiver is plugged in (floating chassis), an isolation transformer must be used during service to avoid shock hazard.

2) Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shat-ter-proof goggles and keep picture tube away from the body while handling.

3) When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

4) Before returning the set to the customer, always perform an AC leakage curent check on the exposed metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlays, control shafts etc. to be sure the set is safe to operate without danger of electrical shock. (Plug the AC line cord directly into a 120V AC outlet do not use a line isolation transformer during this check). Use an AC voltmeter having 5000 ohms per volt or more

sensitivity in the following manner. Connect at 1500 ohm watt resistor, paralleled by a 0.15 mfd, AC type capacitor, between a known good earth ground (water pipe, conduit, etc.) and the exposed metalic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and o.15 mfd capacitor. Reverse the AC plug at the AC output and repeat AC voltage measurements for each exposed metallic part. Voltage messured much not exceed 0.3 volts RMS. this corresponds to 0.2 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

3. PRODUCT SAFETY NOTICE

many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by shading on the schematic diagram and the parts list. Before replacing ant of these componrnts, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create X-ray radiation or other hazards.

4. SERVICE NOTES

1) Which replacing parts or circuit boards, clamp the lead wires to terminals before soldering.

2) When replacing a high wattage resistor (metal oxide film resistor) in the circuit board, keep the resistor min 1/2 inch away from circuit board.

3) Keep wires away from high voltage or high temperature components.

■■

IMPORTANT SERVICE NOTES

Page 7

1. GENERAL

In the majority of cases, color television will need only slight touch-up adjustment upon installation. Check the basic characteristics such as height, focus and sub-bright. Observe the picture for good black and white details without objectionable color shading. If color shading is evident, demagnetize the receiver. If color shading still persists, perfor purity and convergence adjustments. this should be all that is necessary to achieve optimum receive performance.

2. VERTICAL HEIGHT ADJUSTMENT

1) Tune in an active channel.

2) Adjust brightness and contrast control for a good picture.

3) Adjust vertical height control (R304) for approximately one half inch over scan at top and bottom of picture screen.

3. FOCUS ADJUSTMENT

1) Tune in an active channel.

2) Adjust brightness, sharpness and contrast controls for a good picture, sharp scanning lines and/or sharp picture.

4. RF AGC ADJUSTMENT

1) Tune in an active channel.

2) Using the attenuator, apply the signal of 60dBµV to the Antena input terminal

3) Turn RF AGC control (R106) so that it is 1.0V±0.3V lower than maximum voltage.

5. HIGH VOLTAGE CHECK

High voltage is not adjustable but must be checked verify that the receiver is operating within safe and efficient design limitations as specified :

1) Operate Receiver for at least 15 minutes at 100-140V AC line.

2) Set brightness, sharpness, contrast and color controls to minimum position (Zero beam).

3) Connect an accurate high voltage meter to CRT anode. The reading should be as follows.

If a correct reading connot be obtaines, check circuitry for malfunctioning components.

6. X-RADIATION PROTECTION CIRCUIT TEST

When service has been performed on the horizontal deflection system, high voltage system or B+ system, the X-RADIATION PROTECTION circuit must be tested for proper operation as follows:

1) Operate receiver for at least 15 minutes at 120V AC line.

2) Confirm high voltage protector when R409 of power PCB is connected to 30kΩ(1/4w) in parallel.

3) If high voltage protector is operated, remove 30kΩ(1/4w) and confirm whether high voltage protector is still on.

4) Confirm normal operation on sound and video when R410 is shorted.

7.WHITE VALANCE ADJUSTMENT

1) Receive MONOSCOPE PATTERN signal.

2) Set the each BIAS VR (VR903, VR904, VR905) and DRIVE VR(VR901, VR902) to center position and Minimize SCREEN using SCREEN VR on the side of FBT.

3) Open LEVER SW(S901) of CRT PCB.

4) Make straight and horizontal line by pushing service key(V/H) on the SERVICE remocon.

5) Turn the SCREEN VR slowly until first color is brightened and turn the concerned BIAS VR to the anticlockwise until that line's color is diappeared.

6) Turn the SCREEN VR slowly again until another color is brightened and turn the concernde BIAS VR to the anticlockwise until that line's color is diappeared.

7) Turn the SCREEN VR slowly again until third color is brightened and turn the concerned BIAS VR to the anticlockwise until that line's color is diappeared.

8) Adjust the BIAS VR to become white concerned line by turning the BIAS VR in concerned with step 4-6, and 4-7 to clock direction (to be brightened).

9) Although you did step 4-5, 4-6, 4-7, If it is not bright each step's color but bright first color, stop turn the SCREEN VR at the position which color is hardly to be seen, and concerned BIAS VR to clock direction (to be brightened).

10) Turn LEVER SW(S901) of CRT PCB on.

11) Let the straight and horizontal line to be disappeared by

pushing service key(V/H) on the SERVICE remocon.

12) Set CONTRAST to maximize and set BRIGHT to

become center, and adjust WHITE BALANCE using R's and B's DRIVE VR.

13) Inspect TRACKING of WHITE BALANCE by varying

CONTRAST and BRIGHT. If you need to inspect again, Repeat step 4-5 to 4-9.

NOTE :

1. When performing any adjustments to resistor controls

and transformers use non-metallic screw driver or TV alignment tools.

2. Before performing adjustments TV set must be on at

least 15 minutes.

■■

GENERAL ADJUSTMENT

DVN-14F6N 24KV~26KV DVN-20F6N 26KV~28KV

Page 8

8. CONVERGENCE MAGNET ASSEMBLY POSITIONING

Convergence magnet assembly and rubber wedges need mechanical positioning following the figure 2.

8-1. COLOR PURITY ADJUSTMENT

NOTE : Before attempting any purity adjustments, the

receiver should be operated for at least 15 minutes.

1) Demagnetize the picture tube using a degaussing coil.

2) Vary the CONTRAST and BRIGHTNESS controls to

maximum.

3) Adjust RED and BLUE Bias controls (RJ04 and RJ24) to

provide only a green raster. Adjust the GREEN BIAS control (RJ13) if necessary.

4) Loosen the clamp screw holding the yoke, and slide the

yoke backward to provid vertical green belt (zone) in the picture screen.

5) Remove the Rubber Wedges.

6) Rotate and spread the tabs of the purity magnet (see figure 2) around the neck of the picture tube until the green belt is in the center of the screen. At the same time, center the raster vertically.

7) Move the yoke slowly forward until a uniform green screen is obtained. Tighten the clamp screw of the yoke temporarily.

8) check the purity of the red and blue raster by adjusting the BIAS controls.

9) Obtain a white raster, referring "CRT GRAT SCALE ADJUSTMENT" on the CRT board.

10) Proceed with convergence adjustment.

Page 9

8-2. CONVERGENCE ADJUSTMENTS

NOTE : Before attempting any convergence adjustments,

the receiver should be operated for at least 15 minutes.

A. CENTER CONVERGENCE ADJUSTMENT

1) Receive crosshatch pattern with a crosshatch signal generator.

2) Adjust the BRIGHTNESS and CONTRAST Controls for a good picture.

3) Adjust two tabs of the 4-Pole Magnets to change the angle between them (See Fig 3) and supertmpose red and blue vertical lines in the center area of the picture screen. (See Fig. 4)

4) Turn both tabs at the same time keeping their angles constant to superimpose red and blue horizontal lines at the center of the screen. (See Fig. 4)

5) Adjust two tabs of 6-Pole Magnets to superimpose red/blue line with green one. Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines.

6) Repeat adjustments 3) 4) 5) keeping in mind red, green and blue movement, because 4-Pole Magnets and 6Pole Magnets interact and make dot movement complex.

B. CIRCUMFERENCE CONVERGENCE ADJUSTMENT NOTE : This adjustment requires Rubber Wedge Kit.

1) Loosen the clamping screw of deflection yoke to allow to yoke to tilt.

2) Place a wedge as shown on figure 2 temporarily. (Do not

remove cover paper on adhesive part of the wedge).

3) Tilt front of the deflection yoke up or down to obtain better convergence in circumference. (See Fig. 4) Push the mounter wedge into the space between picture and the yoke to hols the yoke temporarily.

4) Place other wedge into bottom space and remove the cover paper to stick.

5) Tilt front of the yoke right or left to obtain better convergence in circumference. (See Fig. 4).

6) Hold the yoke position and put another wedge in either upper space. Remove cover paper and stick the wedge on picture tube to hold the yoke.

7) Detach the temporarily mounted wedge and put it in another upper space. Stick it on picture tube to fix the yoke.

8) After placing three wedges, recheck overall convergence. Tighten the screw furmly to hold the yoke tightly in place.

9) Stick 3 adhesive tapes on wedges as shown in figure 2.

Fig. 3

Fig. 4 Dot Movement Pattern

Page 10

1-3. Installing the Leadless (chip) Component

1) Presolder the contact points of the circuit board.

2) Press the part downward with tweezers and solder both electrodes as show below.

■■

LEADLESS(CHIP) INSTRUCTION

Note :

Do not glue the replacement leadless component to the circuit board.

1-1. Preparation for replacement

a. Soldering Iron

Use a pencil-type soldering iron that uses less than 3o watts.

b. Solder

Eutectic solder (Tin 63%, Lead 37%) is recom mened.

c. Soldering time

Do not apply heat more than 4 seconds.

d. Preheating

Leadless capacitor must be preheated before installation. (130°C~150°C, for about two minutes).

1-2. Removing the leadless component (Resistors,

Capacitors)

.Grasp the leadless component body with tweezers and alternately apply heat to both electrodes. When the sol- der on both electrodes is melted, remove leadless component with a twisting motion.

1.LEADLESS(CHIP) COMPONENT REMOVAL INSTRUCTION

• The following procedures are recommended for the replacement of the leadless components used in this unit.

Note :

a. Leadless component must not be reused after

removal.

b. Excessive mechanical stress and rubbing of the

component electrode must be avoided.

Note :

a. Do not attempt to lift the component off the board

until the component is completely disconnected from the board by a twisting action.

b. take care not to break the copper foil on printed

board.

Page 11

• Cracked Chipped component Body

• Cracked Separated Solder Joints

• Peeling end Terminations Fractured Leads

2-2. S.M.D (Surface Mounted Devices) Identification

1) Chip Resistor Identification * Standard chip Resistor code

2) Chip Capacitor Identification There is no identification of chip capacitor

REMARK Leadless (CHIP) components are identified on

schematic by means of "(C)" adjacent to symbol numbers.

• Rejection of Solder from copper Pads or Component

• Foreign Matter on Copper Pads

• Sloder Bridges

2.LEADLESS (CHIP) COMPONENT IDENTIFICATION

2-1. Check the followings before S. M. D Troubleshooting

XXX

MULTIPLIER (0-9) 2nd SIG. DIGHT (0-9) 1st SIG. DIGHT (1-9)

Examples

123

470

= 12x103(1000) = 12000Ω

= 12KΩ

= 47x 10°(1) = 47Ω

A. cleaning the Tape Transport System

The following parts should be cleaned after every 500

hours of use.

•TENSION POLE

• S-GUIDE POST

• FE HEAD

• S-SLANT POLE

• VIDEO HEAD/DRUM

• T-SLANT POLE

• T-GUIDE ROLLER

• AC HEAD/AE HEAD

• T-CUIDE POST

• CAPSTAN SHAFT

• PINCH ROLLER

NOTE : After cleaning with alcohol, allow the parts to dry thoroughly before using a cassette tape.

B. Cleaning the Drive System

The following parts should be cleaned after every 500

hours of use.

• REEL TABLE

• T MAIN BRAKE

• S MAIN BRAKE

• T MAIN BRAKE

• CAPSTAN FLYWHEEL/PULLEY

• REEL PULLEY

C. Lubrication points

The following parts should be cleaned and lubricated after every 500 hours of use. apply one (1) or two (2) drops of oil. Refer to the "Replacement Parts List" for the stock number of the recommended oil.

• S REEL TABLE POST

• T REEL TABLE POST

• IDLER PULLEY

CLEANING AND LUBRICATION OF DECK MECANISM IN DVN-14/20F6N

Cleaning and Lubrication

Page 12

■■

MECHANICAL DISASSEMBLY(DECK)

1. Earth Bracket Ass'y

2. FE Head

3. S-Slant Pole Ass'y

4. Tension Lever Ass'y

5. Reel Table

6. Main Base Ass'y

7. S-Sub Brake Ass'y

8. S-Main Brake Ass'y

9. Idler Plate Total Ass'y

10.T-Main Brake Ass'y

11.T-Sub Brake Ass'y

12.Relay Lever

13.Capstan Motor

14.Pinch Lever Total Ass'y

15.L/C Bracker Total Ass'y

16.Cam Gear

17.AC Head Total Ass'y

18.T-Slant Pole Ass'y

Fig. 9- tape Transport Mechanism Identification (Top View)

1.TOP VIEW

Page 13

20.Capstan Motor

21.F/L Rack

22.Connect Plate

23.Reel Belt

24.Reel Gear Total Ass'y

25.Record Safety Lever

26.Loading Lever L

27.Loading Lever R

28.Drum Total Ass'y

29.Loading Rack

Fig. 10- Tape Transport Mechanism Identification (Bottom View)

2.BOTTOM VIEW

Page 14

1. Top Plate Ass'y

2. F/L Bracket R

3. Prism Cap

4. Release Lever

5. Loading Lever R

6. CST Holder Ass'y

7. Loading Shaft

8. Loading Lever L

9. Door opener

10.Safety Lever

11.Safety Lever R

Fig. 11- Front Loading Mechanism Identification (Top view)

3.F/L MECANISM VIEW

Page 15

4. General removal view

Front Loading Mechanism Removal (Fig. 12)

NOTE :

The front loading mechanism must be in the eject position to remove it.

1. Remove two (2) screw holding the Front Loading Mech-

anism.

2. Lift the rear of the cassette loading mechanism (hole

parts for screw) to separate it from the Main Base.

Front Loading Mechanism disassembly

(Fig. 13~17)

1. Remove the front loading mechanism.

2. Remove one(1) screw holding the F/L bracket R and

move the F/L bracket R in the direction of arrow to separate it from the top plate and the cassette holder

assembly.

3. Remove the cassette holder assembly (Fig. 13)

4. Remove the prism cap and remove one (1) screw hold-

ing the prism link R and remove the prism link R from the F/L bracket R (Fig. 4)

5. Remove one (1) screw holding the prism link L (Fig. 15).

6. Release hook B by pushing it in the direction of the arrow and remove the door opener (Fig. 15).

7. Press the linked section of the loading lever assembly in the direction of the arrow and remove the loading lever assembly (Fig. 16)

8. Remove the safety spring between the safety lever and the cassette holder (Fig. 16)

9. Remove the release spring between the release lever and the safety lever R (Fig. 16)

Fig. 12- Front Loading Mechanism Removal

Fig. 14- F/L Brkt Disassembly

Fig. 15- Top Plate Disassembly

Fig. 13- front loading mechanism disassembly

Page 16

NOTE : Reassemble the cassette loading mechanism using the

reverse procedures. Confirm that the two (2) bosses on the left side of the cassette holder are inserted into the groove in the left side of the top plate. Insert the two (2) bosses on the right side into the F/L bracket R (Fig. 17)

Replacement of the Drum Assembly/Earth Bracket (fig. 18)

1. Remove three (3) screw (3).

2. Remove the earth bracket (5).

3. Carefully lift drum assembly (4) from the deck mechanism taking care not to damage or touch the video heads.

NOTE :

After reassembling the assembly, confirm that the tape runs smoothly and confirm all tape path adjustment procdures in the "Mechanical Adjustment" section of this service publication.

Reel belt, Loading Rack, Loading Gears, and S/T Slant Pole Removal (Fig. 19, 20)

1. Turn the Deck Mechanism upside down and remove the reel belt.

2. Remove one (1) poly washer ① and remove the loading rack (2).

3. Remove Right and left loading gears ③ and ④.

4. Remove the S and T slant poles ⑤ and ⑥ by pulling them in the direction of the arrow.

NOTE :

• Take care not to get grease on the guide rollers.

• When reinstalling, realign the gears as shown in Fig 20.

Fig. 16- Loading Lever Ass'y Disassembly

Fig. 17- F/L Brkt R

Fig. 18- Replacement of the Drum total Ass'y and Earth Brkt Ass'y

Fig. 19- Reel belt, Loading Rack, Loading Gears, S/T slant pole

Removal

Page 17

A/C Head Assembly Removal (Fig. 21)

1. Remove one (1) nut hex from the A/C head assembly ① (Fig. 21)

2. Remove the A/C head assembly ② and remove the A/C head spring ③ from the A/C head assembly ②.

NOTE :

After reinstalling, perform all A/CHead adjustment procedures and all tape path alignment procedures in publication. Perform the "Audio Bias Level Adjustment" in the "Electrical Adjustment" section of this service manual.

L/C Bracket Assembly removal (Fig. 22)

1. Remove one (1) screw ① from the L/C bracket assembly ②and remove the L/C bracket assembly ② from the deck mechanism (Fig. 22)

NOTE :

When reassembling, refer to Fig. 23 for alignment instructions.

Replacement of Pinch Lever Total Assembly Removal

(Fig. 22)

1. Remove one (1) washer ③.

2. Unhook the pinch spring ④ from the main base ⑤ and remove the pinch lever total assembly ⑥.

NOTE :

Take care not to get oil on the outside surface of the pinch roller ⑩.

Fig. 20- Loading Gears/Loading Rack Alignment

Fig. 21- A/C Head Assembly Removal

Fig. 22- Replacement of L/C Bracket Total Assembly/Pinch

Lever Total Assembly/cam Gear/Relay Lever/F/L Rack

⑩

Page 18

Cam Gear, and F/L Rack Removal (fig. 22)

1. Remove the cam gear ⑦ form the deck mechanism.

2. Remove the relay lever ⑥ from the main base ⑤.

3. Remove the F/L rack ⑧ from the deck mechanism.

NOTE :

When reassembling, align the assembly as shown in Fig. 23 & 24.

S/T Main & Sub Brakes Removal (Fig. 25)

1. Unhook the main brake spring ① from the T main brake lever ③.

2. Disconnect the main brake lever assembly ② and T main brake lever ③ from the main base ⑧.

3. Unhook the s sub brake spring ④ from the main base and disconnect the s sub brake lever assembly ⑤ from the main base ⑧.

4. Unlook the T sub brake spring ⑥ from the main base and disconnect the T sub brake lever assembly ⑦ from the main base ⑧.

Tension Band Assembly Removal (Fig. 26, 27)

1. Remove the tension spring ② from the main base ① (Fig. 26)

2. Turn the deck mechanism upside down (fig. 27) is facing down (fig. 27)

NOTE :

• After reassembling, adjust the position of the tension pole

as shown in fig. 28.

• Avoid getting grease or oil on the felt section of the band

brake.

Fig. 23- L/C Bracket Assembly Alignment

Fig. 25- Main Plate Removal

Fig. 26- Tension Band Assembly Removal (1)

Fig. 24- Cam Gear/F/L Rack Alignment

Page 19

Capstan Motor Removal (Fig. 29)

Remove three (3) screws and remove the capstan motor.

Idier Plate/Reel Table Removal (fig. 30)

1. Remove one ① polywasher ① from the idler plate ② and remove the idier plate ② from the main base.

2. Remove the reel tables ③ and the two ② polysliders ④ from the deck mechanism.

FE Head Removal (fig. 31)

Remove one (1) screw (1) and lift the FE head (2) from the main base.

Reel Gear Total Ass'y and Connect Plate Removal

(fig. 32)

1. Turn the deck mechanism upside down and remove one ① polywasher ①.

2. Release the tab "B" of the main base and part the reel gear total ass'y ② from the main base.

3. Push the connect plate ③ to the left direction and separate it from the main base.

NOTE :

• When removing the connect plat with the the F/L rack

installed, take care not to damage/bend the connect plate.

• When assembling or disassembling, take care not to get

oil or grease on the reel belt.

Fig. 27- Tension Band Assem-

bly Removal (2)

Fig. 28- Tension Band Assem-

bly Alignment With Main Base

Fig. 31- FE Head Removal

Fig. 32- Reel gear total ass'y and Connect Plate Removal

Fig. 29-Capstan Motor Removal

Fig. 30- Idler Hate/Reel Table Removal

Page 20

Some disassembly is required to access the adjustment locations. Refer to the "Disassembly Selection" in this publication for disassembly instructions.

Caution : Use an isolation transformer when servicing.

5. Mechanical Checks/Gear Alignment (fig. 1, 2, 3, 4, 5)

When mechanical problems occur or when reassembling parts in this mechanism, be sure to confirm the following instructions to confirm the following:

1. Make sure that the datum hole of the cam gear "A" is aligned with the hole "B" in the main base in the EJECT mode (fig. 1)

2. Make sure that the part of the relay lever "A" which is assembled with CONNECT PLATE is fully rotated up to the left and

of the hole "B" (Fig. 2)

Fig. 1– Mechanical Checks/Cam Gear and F/L Alignmen

Fig. 2- Mechanical Checks/relay Lever and Cam Gear Alinment

Page 21

3. There are two (2) triangular marks on the mode sense switch. When installing the L/C bracket assembly on the main base, confirm that the two (2) triangular marks aligned with each other in the EJECT mode (Fig. 3)

4. Make sure that the boss "A" of the Pinch Lever Total Ass'y is positioned at the point "B" of the cam gear in EJECT mode

(fig. 4).

Fig. 3 - Mechanical checks/Mode Sense S/W Alignment

Fig. 4 – Mechanical Checks/Pinch Lever and Cam Gear Alignment

Page 22

5. Confirm that the triangular mark "A" on the Loading Gear L Ass'y is aligned with the notch "B" in the Loading Gear R Ass'y in EJECT mode (Fig. 5)

6. Make sure that the teeth of the Loading Rack are aligned with the those of the Loading Gear R so that hole "C" of the Loading Rack aligns with the circulr mark "D" on the Loading Gear R (fig. 5)

Fig. 5- Mechanical Checks/Loading Loading Rack and Loading Gear Alignment

Page 23

6. Tension checks

Back Tension Measurement /Adjustment (fig. 6, 7)

1. Confirm that the position of the tension pole is correctly positioned. If not, refer to the "Tension Pole Position Adjustment Procedures"

2. Play back a T-120 tape from the beginning for about 20 seconds (wait until tape transporting system comes to be stable).

3. Insert the Tensiometer on the tape path (fig. 6) and measure the back tension. the measured result must meet the specification (25-33gr).

4. If the result is not within the specification, adjust the tension spring (If the measured result exceeds the specification, locate the spring on the hook "A". If the value does not reach the specification, locate the spring on the hook "B".) and repeat the step 1 thru 3 of "Tension Pole Position Adjustment" (fig. 7).

NOTE :

• Make sure that all of the three probes of the Tensiometer are on contact with the tape, but not with any other parts of the

Deck mechanism.

• It is recommended that the measurement should repeated at least three times to guarantee an accurate reading.

Fig. 6 - Back Tension Measurement/Adjustment

TENSIOMETER PROBE

Page 24

Operating the VCR Without a Cassette Tape

1. Remove the cassette Loading Mechanism.

2. By hand revolve the worm counterclockwise 7-8 times until pole base loading process starts automatically.

3. Then PLAY mode appears. If you want ANOTHER mode, Press the desired button.

4. If the mechanism is in the desired mode, remove the Power.

Tension Pole Position Adjustment

1. Make the mode PLAY without a cassette loaded. Refer to "Operating the VCR Without a Cassette Tape".

2. Confirm that the datum hole of the tension lever is coincident with that of the main base.

3. If the above confirmation is not satisfying, turn Band Brake Cap clockwise or counterclockwise until the two holes are coincident with each other.

Fig. 7- Tension Pole Position Adjustment

Page 25

Tape Path Alignment Procedures

The tape transporting system is precisely aligned at the factory and under the normal circumstances will not require adjustment. However, if noise appears in the playback picture, it can be considered that the tape damage occured or the tape path has been changed, readjustment of the tape path is necessary.

ADJUSTMENT FLOW FOR THE TAPE TRANSPORTING SYSTEM

■■

MECHANICAL ADJUSTMENTS

CLEANING

PATH ROUGH ADJ. S GUIDE ROLLER HEIGHT ADJ.

• DRUM TOTAL ASS'Y

• A/C HEAD ASS'Y

• PINCH LEVER

TOTAL ASS'Y

• S-POLE BASE ASS'Y

• T-POLE BASE ASS'Y

• TENSION LEVER

ASS'Y

A/C HEAD HEIGHT ADJ.

PG(PHASE GENERATOR)

ENTRANCE ENVELOPE

EXIT ENVELOPE WAVEFORM

SP, EP

ENTRANCE & EXIT ENVELOPE

WAVEFORM FINE ADJ,

• X-POSITION ROUGH ADJ.

• ENTRANCE & EXIT ENVELOPE

WAVEFORM FINE ADJ.

• REVIEW 󱈇 PLAY

CHANGE

AUDIO TILT, HEIGHT

AZIMUTH ADJ.

S GUIDE POST FLANGE

T GUIDE ROLLER HEIGHT ADJ.

LINEARITY ADJ.

PATH PRE-ADJ.

AUDIO ADJ.

TRACKING

X-POSITION ADJ.

Table. 8 Flow Chart of Tape Path Alignment

Page 26

THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM

① TENSION POLE

② S-GUIDE POST ③ FE HEAD ④ S-GUIDE ROLLER(P2

)

⑤ S-SLANT POLE ⑥ DRUM ⑦ T-SLANT POLE

⑧ T-GUIDE ROLLER(P

⑨ A/C HEAD ⑩ T-GUIDE POST ⑪ CAPSTAN SHAFT ⑫ PINCH ROLLER ⑬ VERTICAL POST

Page 27

■■SSHHAAPPEE && EEQQUUIIPPMMEENNTT OOFF DDVVNN--1144//2200FF66NN

1. DVN-14F6N/DVN-20F6N

1-1. FRONT OF TV/VCR

1-2. SIDE OF TV/VCR

SPEAKER (RIGHT)

FRONT DOOR

Page 28

1-3. REAR OF TV/VCR (DVN-14F6N ONLY)

VHF Input

connect VHF antenna to this terminal.

VHF INPUT

* Rear of TV/VCR's Shape of DVN-20F6N is

similar to DVN-14F6N'S

Page 29

2. PANEL VIEW

2-1. FRONT PANEL The section below summarizes the buttons, controls, and terminals that you will use with your TV.

Your TV/VCR's front Panel

Below you will find short descriptions of the buttons and indicators on the front panel. These are used following functions.

1 VIDEO IN jack

Use this jack to receive a video signal from another A/V component.

2 AUDIO IN jack

Use this jack to receive an audio signal from another A/V component.

3 Remote control receiver

This receiver receives a signal from your remote control. Do not block it.

4 STAND-BY (red) indicator

This indicator lights up when the power is off.

5 REC (Green) indicator

this indicator blinks when recording and lights up when set for timer recording.

6. CHILD LOCK (Yellow) indicator

This indicator lights up when the child lock is set.

7. REC button (record)

Press this button to begin recording. Press repeatedly to set a recording time using One-Touch Recording (OTR).

8 REW button (rewind)

Use this button to rewind the tape.

9 PLAY button

Press this button to begin normal playback of a tape.

10 FF button (fast forward)

Use this button to "fast forward" a tape.

11 ST/EJ button (stop/eject)

Press this button when a tape is moving to stop the tape. Press this button when the tape is stopped to eject it.

12▼▼VOL▲▲buttons (volume)

Use these buttons to change your TV/VCR's volume.

13▼▼CH▲▲buttons (channel)

Use these buttons to change channels on your TV/VCR. You will also use these buttons to adjust the tracking.

14 Power button

Use this button to turn your TV on or off.

Page 30

3. Remote controller (DVN-14F6N/20F6N)

1 POWER

Use this button to turn your TV/VCR on or off.

2 TV/CATV

Use the button to set up your TV/VCR to receive signals from an antenna (TV) or a cable system (CATV).

3 TV/LINE

Use this button to select between viewing the signal coming from the antenna terminal (TV) or the signal coming from the A/V jacks (LINE).

4 RESET

Press this button to reset the counter to 0:00:00.

5 O STOP

Press this button to automatically rewind the tape to the 0:00:00 point.

6 VISS

▶▶▶▶

Press this button to find the next index mark on a tape and begin playing.

7 VISS

◀◀◀◀

Press this button to find the most recent index mark on a tape and begin playing.

8 REC ON/OFF

Use this buttin to enable or disable timer recording.

9 MENU

press this button to turn the on-screen menu system on and off.

10 REW (rewind)

Use this button to rewind the tape or to change items in the menu system.

11 REC/OTR

Press this button to begin recording. Press repeatedly to set a recording time using OneTouch Recording (OTR).

12 PAUSE/STILL

Press to temporarily stop the tape during recording or playback, or to move the cursor in the menu system.

1 2 3

4 5 6

7 8 9

SLEEP 0

STOP//EJECT

100

MUTE RECALL

TV/CATV

POWER

TV/LINE

RESET

COUNTER

0 STOP

REC ON/OFF

REC/OTR SPEED

CLEAR

PAUSE/STILL

PLAY

VOL/V-LOCK CH/TRK

FFREW

VISS

REMOTE CONTROLLER R-35A01

1 2 3 4

5 6

7 8 9

11 12

Page 31

13 MUTE

Use to turn the TV/VCR's sound on and off.

14 RECALL

Press this button to display the current time, the counter, channel number or other status items.

15 Number buttons (0-9)

Use these buttons to change channels or select menu items.

16 100

Use this button if you wish to view a channel greater than

99.

17 SLEEP

Use this button to program the TV/VCR to turn off after a certain time.

18 CH/TRACKING

Use these buttons to change channels on your TV or to adjust the tracking of a video tape during playback.

19 VOL/V-LOCK

Press to adjust the volume of the TV/VCR. You can also use these button to eliminate video noise when displaying a still frame.

20 CLEAR

Press this button to erase timer recording settings.

21 PLAY

Press this button to begin normal playback of a tape, or to move the cursor in the menu system.

22 FF (fast forward)

Use this button to "fast-forward" a tape or to change items in the menu system.

23 SPEED

Use this button to select the SP, LP, or SLP tape speed.

23 STOP/EJECT

Press this button when a tape is moving to stop the tape ; press it when the tape is stopped to eject it. Also use this button to activate items in the menu system.

1 2 3

4 5 6

7 8 9

SLEEP 0

STOP//EJECT

100

MUTE RECALL

TV/CATV

POWER

TV/LINE

RESET

COUNTER

0 STOP

REC ON/OFF

REC/OTR SPEED

CLEAR

PAUSE/STILL

PLAY

VOL/V-LOCK CH/TRK

FFREW

VISS

REMOTE CONTROLLER R-35A01

16 17

19 20

21 22

23 24

Page 32

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis : S/DIV

Vertical Axis : CH1 : H/SW, CH2 : ENVELOPE

1. SERVO

1-1) X-path and P2, P3 Adjustment

Adjustment Procedure

1. Preparation

1) Set the AUTO TRACKING to OFF using REMOCON.

2) Play back the Test tape (Color Bar)

3) Set the oscilloscope to the CHOP mode. Connect CHI to the H/W (PY09) and CH2 to the ENVELOPE (PY09) and

trigger the scope with the signal from CH1.

2. Adjustment

1) Adjust CORN SCREW to position to maximize the width of the ENVELOPE pluse.

2) Adjust P2 to position which the edge of ENVELOPE signal has equal degree to the body of ENVELOPE signal.

Adjusting P3 is same to P2's.

3. Remark

1) After adjusting, press stop button to eject the tape.

2) Insert the tape into deck to confirm Autotracking.

3) If Normal screen is showed up as soon as it is start to play, adjustment becomes good.

If not, Adjust repeatedly to operate autotracking.

4) To know P2, P3, and CORN SCREW, refer from 'The schematic diagram of tape transporting system' on page 23

■■

ELECTRICAL ADJUSTMENTS

Item Mode Adjustment parts Check point Test equipments Test tape Input signal

X-path PLAY CORN SCREW PY09 Oscilloscope DN-1

P2, P3

DECK A'S

MAIN PCB

PY09

PY05

Y/C BOARD

⊕RN90

Page 33

1-2) PLAYBACK PHASE Adjustment

• Adjustment Procedure

1. Preparation

1) Play back the Test tape (Color Bar).

2) Connect scope's connector to PY 09

3) Set the Oscilloscope to the chop mode. Connect CH1 to the H/SW(PY09) and CH2 to the V-OUT(PY09) and trigger the scope with the signal from CH1.

2. Adjustment

1) Adjust RN90 to position the rising edge of SW PULSE at 6.5H from the V-SYNC.

Mode Adjustment parts Check point Test equipments Test tape Input signal

Play RN90 RY05 Oscilloscope DN-1

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis : 100µS/DIV

Vertical Axis : CH1 : SW30, CH2:V.OUT

DECK A'S

PY09

PY05

Y/C BOARD

⊕RN90

Page 34

2. AUDIO

2-1) AUDIO CIRCUIT ADJUSTMENT METHOD

• Adjustment Procedure

1. Preparation

1) Set REC BAIS to ON mode using REMOCON. (then, front pannel's REC LED will be lighted up.)

2) Supply the signal in the OPEN mode.

3) Connect the Audio level meter to RC HEAD 10Ω (on solder side).

2. Adjustment

1) Adjust RU57 to obtain [3.0]mVrms.

3. Adjustment Inspection Standard : [3.0 ± 0.1mVrms]

• If you don't have Service Remocon, You can set this rec mode by inserting a tape (with record top) and pushing rec button.

Item Mode Adjustment parts Check point Test equipments Test tape Input signal

Audio

REC RU57 RC HEAD 10Ω Audio level meter Blank tape

Record Bias

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis :

Vertical Axis :

RC HEAD

DECK A'S

MAIN PCB PARTS SIDE

PY09

PY05

Y/C BOARD

⊕RU57

Page 35

2-2) Audio Azimuth Adjustment

• Adjustment Procedure

1. Preparation

1) Set the VCR to the PLAY mode

2) Set the Scope connector to the P602.

3) Adjust first screw on the plate under the AC head to maximize scope's signal width.

2. Adjustment Inspection standard : [Maximum Point]

Item Mode Adjustment parts Check point Test equipments Test tape Input signal

Audio Azimuth

PLAY AC HEAD'S P602 Signal GEN. DN-2 7KHz

Adjustment

SCREW Osilloscope MONO Bar

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis : 0.1mS/DIV

Vertical Axis : 0.1V/DIV

MAIN PCB PARTS SIDE

PY09

PY05

Y/C BOARD

P602

···

RC HEAD

DECK A'S

Page 36

3. VIDEO

3-1) Y NOISE REDUCTION

• Adjustment Procedure

1. Preparation

1) Supply the MULTI BURST signal to the VIDEO IN JACK.

2. Adjustment

1) Set the VCR to the STOP(EE) MODE.

2) Set the Oscilloscope to the chop mode.

Connect CH1 to the V-OUT(RY09) and CH2 to the CNR TP(RY05) and trigger the scope with the signal from CH1.

3) Adjust RY34 to the 3.58MHz Y component of MULTI BURST signal becomes less than [20]mVp-p.

Location of Adjustment Parts Observation Waveform

Y/C PCB Horizontal Axis : 10µS/DIV

Vertical Axis : 20 mV/DIV

Y/C PCB SOLDER SIDE

PY05

IY03 IY01

IY02

⊕RY34

Mode Adjustment parts Check point Test equipments Test tape Input signal

EE RY 34 PY05, PY09 Oscilloscope Multi Burst

Signal gen. with 3.58 MHz

PAY01 PAY02

CH-2 (PY05YNR)

Horizontal:10µs/DIV Vertical:20mv/DIV

Page 37

3-2) COLOR NOISE REDUCTION

• Adjustment Procedure

1. Preparation

1) Supply the Color bar signal to the VIDEO LINE IN JACK.

2) Supply 5V to RY05.

2. Adjustment

1) Set the VCR to the STOP(EE) Mode.

2) Set the Oscilloscope to the chop mode. Connect CH1 to the V-OUT(RY09) and CH2 to the YNR TP (RY05) and trigger the scope with the signal from CH1.

3) Adjust RY91 until Color signal becomes minimum.

Location of Adjustment Parts Observation Waveform

Y/C PCB Horizontal Axis : 10µS/DIV

Vertical Axis : 50 mV/DIV

Mode Adjustment parts Check point Test equipments Test tape Input signal

EE RY 91 PY09 Signal gen. Color Bar

Oscilloscope

CH-2(PY09(NR)

Horizontal:10µs/DIV Vertical:50mv/DIV

Y/C PCB SOLDER SIDE

PY05

PY09

IY03 IY01

IY02

⊕RY91

PAY01 PAY02

Page 38

1. VIDEO & AUDIO

1-1. FROM RF TO COMPOSITE VIDEO

When the TIMER IC (I701) selects a certain channel from antenna, CLOCK, DATA, and ENABLE of I701 signals are inputted to the TUNER. So, TUNER(U101) tunes up a certain channel frequency by means of PLL circuit operation and output IF (Intermediate Frequency) signal. This IF signal through Q103, PRE-AMP stage, and SAW FILTER is inputted to I501 #8 and #9, and it is optimized by VCO and AFT. As the result of these operations, COMPOSITE VIDEO SIGNAL comes from pin 51 of I501. Because 4.5MHz sound frequency in the COMPOSITE VIDEO SIGNAL is eliminated by Z102 TRAP, only video signal in the COMPOSITE VIDEO SIGNAL is inputted to pin 45 of I501 and 4.5MHz sound frequency is inputted to pin 48 of I501 through Z103 FILTER.

1-2. COMPOSITE VIDEO SIGNAL

This CHASSIS includes three video signals. One is from RF(above mentioned), another is from A/V, and the third is from PLAY MODE. Switching IC I503 controls these three final video signal. Once one of the two signals(TV video signal from pin 45 of I501 and A/V video signal from pin 42 of I501) is selected, the selected signal is from pin 43 of I501 and it is inpitted to pin 1 of I503. Another video signal from PLAY MODE is inputted to pin 4 of I503. Also, One of the two signals(video signal from pin 1 of I503 and video signal from PLAY MODE) is selected, and the selected signal is transmitted to pin 2 and pin 3 of I503.

Final video signal is inputted to pin 22 of I701 to detect CAPTION SIGNAL and it is also inputted to pin 38(C INPUT), pin (Y INPUT), pin 44(SYNC INPUT). And R-Y signal is from pin 23, G-Y signal is from pin 24, B-Y signal is from pin 22, -Y signal is from pin 22, and those color difference signals are sent to CRT BOARD. In CRT BOARD, those color difference signals are mixed and amplified by color difference drive method.

1-3. AUDIO SIGNAL

This CHASSIS includes three audio signals. One is from RF(above mentioned), another is from A/V, and the third is from PLAY MODE. Switching IC I503 also controls these three audio signal. TV Audio signal from pin 3 of I501 is inputted to pin 8 of I503. A/V audio signal from A/V JACK is inputted to pin 11 of I503 and outputted to pin 9, pin 10. So, that audio signal is inputted to pin 16 of IU01. Audio signal from PLAY MODE is inputted to pin 2 of IU01. One of the two audio signals(audio signal from PLAY MODE, audio signal from A/V mode) is selected and outputted to pin 22 of IU01 and inputted to pin 1 of I501. Audio signal to be inputted pin 1 of I501 and controlled volume is outputted to pin 4 of I501. That audio signal is inputted to pin 3 of I601(SOUND AMP), and amplified by I601 and outputted to pin 5 of I601. Finally that audio signal goes into SPEAKER.

■■

SIGNAL FLOW

Page 39

SWITCHING TABLE OF I503

MODE RF

A/V PLAY TOGGLE

PIN (EE)

5 L L H VIDEO

6 H L L AUDIO 12 L H H AUDIO 13 H H L VIDEO

* The input signal is transmitted to putput port when switching port

is at logically high state.

(Top View)

Page 40

2. Power circuit (Power supply circuit)

2-1. Abstract And Function

It selects SMPS(SWITCHING MODE POWER SUPPLY) which is possible to put in from AC 108V~132V/60Hz with SANKEN Ic STR-S5707 and supply the stable voltage which each circuit needs. The voltage which electric resources circuit supplies is followed.

2-2. I801 STRS-5707

1) BLOCK DIAGRAM

NO.SUPPLY ELECTRIC

SOURCE SUPPLY CIRCUIT APPLICATION

RESOURCES

TRANS SECOND RECTIFIED

FBT

FBT B

1 DC 125V VOLTAGE

PIF

For channel

D814 selecting(33V)

DC 12V REGULATOR IC

SERVO circuit

For driving DRUM,

(MOTOR 12V) I805(PQ12RF11) CAPSTAN MOTOR

TUNER For channel selecting(9V, 5V)

DC 12V REGULATOR IC IF AMP circuit IF amp. circuit(9V), V/SIF(5V)

(ON/OFF 12V) I804(PQ12RF11) AUDIO circuit For driving AUDIO I/O circuit

VIDEO circuit For driving VIDEO, ANALOG circuit

DC 6.0V REGULATOR IC SERVO, TIMER IC For driving SYSCON, TIMER,

(EVER 5.3V) I803(KIA7806) SYSCON IC circuit SERVO circuit

TRANS SECOND

5 DC 14V RECTIFIED VOLTAGE AUDIO circuit AUDIO AMP. B

D813

6 DC 9V

REGULATOR IC

DEFLECTION circuit

VERTICAL IC B

I806 (KIA7809) H. VCC

SENS

PNP

R7 R8 R9

+2D

VIN

START UP

PRB RBG

T.S.D

OVP

LA TCH

OSC

PROPOTONAL

OCP

INH

DRIVE

Trl

Tr2

DRIVD

SINK

GND

OCP

Page 41

2) Function of Each Termiinal

3) Other Function

4) Internal Circuit Constant

No. of Terminal Symbol Description Function

1 C Collector Terminal Collector of TRr(Power Transistor) 2 GND Ground Terminal Ground(Emitter of PTr) 3 B Base Terminal Base of PTr 4 SINK Sink Terminal Base Current (IS) Input 5 OCP Overcurrent Protection Terminal Overcurrent Sensing Signal Input

6 INH

Inhibit Terminal Off Time Synchronizing

Latch Terminal Latch Circuit Operation Signal Input 7 SENS Sensing Terminal Constant Voltage Control Signal Input 8 DRIVE Drive Terminal Base Drive Currnet(ID) Output 9 VIN VIN Terminal Control Circuit Power Supply Input

Symbol Function

OVP Built-in Overvoltage Protecton circuit TSD Built-In Thermal Shutdown Circuit

R1 T ON Adjustment Trimming Resistor R7 14KΩ C4 0.01µF R2 T OFF Adjustment Trimming Resistor R8 2.5K C5 1500pF R3 1.0kΩ R9 35kΩ R4 100Ω C1 3300pF R5 85Ω C2 0.01µF R6 Vs Adjustment Trimming Resistor C3 820pF

Page 42

2-3. SMPS BASIC OPERATING DESCRIPTION

1) Power supply block circuit

2) Initially starting operation – When AC power supply is put in at first, the voltage which rectifies this.happens on the both Blocks of C806

This voltage flows through R806 and is the circuit which searchs the voltage of I801 Vin TERMINAL (PIN No.#9) and starts or stops operating I801.

– Turning on the power supply, CTRL circuit starts operating by the funtion of START circuit, when it is charged to C807

through starting resistance R806 and Vin terminal voltage goes to 8V (TYP.)

– According to the multiplication(PRODUCT) of starting resistance R806 and C807, time is decided which CTRL citcuit

starts operating after putting AC input voltage. So, if the value of C807 is too high, It could be late for I801 to start.

– When CTRL circuit starts operating and the voltage of DRIVE wound wire (pin no #3) of T801 TRANS is up, I801

starts operating after rectification of D808 and C807.

– When the voltage of detect wound wire(pin no #4) T801 TRANS increases and is rectified through D807 and C809

and DC 32V is put in I801 sense(pin no #7), TRANS secondary voltage is established.

– When MAIN TR of power IC is off, energy which is charged to the primary is transtmitted through TRANS secondary

rectification DIODE.

PWC1

R804

2.2M(COMP) 1/2W

F801

AC 125V 4A

C801 O.1U(M) AC250V

Z801

SVC2710

VARISTOR

L801

TLF-472BE

D802-D805

:1S1888

C802-C805 4700P 500V

R803 1 OHM 7W CEMENT

R812 120K 1/2W

R806

36K 2W

R819

2.2

1/4W

R833

4.7K 1/4W

R807

18 1W

OCP

1801 STR-S5707

Vin

SENSE

START UP

PRE REA

T.S.D

DSC

REF

OCP

R2 C4

PROPORTION

ORIVE

DVP

LATCM

D810

BYV950

240(*200)

1/4W

R832

R809

0.27(F) 2W

R816

1/4W

C822

1500P

50V

C824

4700P

AC400V

C823 3900P 630VPL

L803

MD-5 C808 220U

25V

R815

1.8K 1/4W

R813 100K 1/4W

C807 220U

25V

C809

10U

100V

D807

BYV95C

123V

15V

8.5V D811

BYV95C

D812

BYV95C

D813

BYW95C

D814

BYW95C

C827

1000P(HIKR)

2KV

T810

TSM-4242A3

C810 470U

16V

C812 470U

25V

C814 470U

25V

C828

0.01U

C815 100U 160V

D809

BYV95C

D808

BYV95C

D803 C803

D805

C805

D802

C802

D804 C804

C806

330U(LWF)

200V

Page 43

3. DEFLECTION CIRCUIT

Vertical, Horizental drive pulses are out of M52335ASP(I501). This vertical drive pulses are connected to Vertical Drive IC TA8445K(I301) and drive vertical deflection coils. This horizental deflection drive pulses by driving horizental output circuits drive horizental deflection coils and supply 26.5v, 180v, high voltage 25kV, focus voltage and screen voltage by driving FBT.

u-COM CIRCUITS.

Timer IC is M37267MX(I701) made by Mitsubish. Syscon receives the signal from user's remocon and it becomes to be serial-communication CLOCK/S DATA IN/S DATA OUT signal. Timer IC selects channel with CLOCL /DATA /EN and receives the functions to control TV and VCR drivings(OSD, VOL CTRL, TV ON/OFF), such as brightness, contrast, color, tint, sharpness, video signal, volume, caption and program recording.

CHANNEL SELECTION AND MEMORY

Selecting operation chosen by user is made up when PLL DATA, PLL CLOCK, PLL ENABLE are put out from u-com and is put in to Tuner. u-com put out data to memory IC 24LC01B(I702) to memorize final channel, volume condition, video condition, memorized channel.

Page 44

SERVO/SYSCON CIRCUIT OPERATION

1) summary

•

When power supply is supplied to TV/VCR, Servo-Syscon 1 Chip IC confirms the driving condition of DECK by checking CAM SW from DECK. And it gets capstan Motor worked and is operated as initial Mode. This is ready for receiving the serial data from timer IC after proper operating according to the driving condition of Deck and the existence of tape or not.

•

When Syscon IC received recording signal, playback signal and so on by receiving of pussing button and using remote control inform Timer IC what button (remote sensor) is pressed as a serial data, Timer IC operates properly on each mode.

•

After making Deck be in proper condition in each mode by driving L/C motor according to each mode, it drives the drum motor and capstan motor to make the head spin and the tape move. Drum and capstan servo are operated in order to obtain clear screen condition.

• The special feature of Drum servo system helps to keep the constant speed and phase of it and to prevent the screen sway up/down. By comparing with D-FG signal from Drum Motor and referencesignal of Syscon IC to keep the constant speed, the difference value is put out to DPWM to drive Drum Motor.

By comparing with D-PG signal from Drum Motor and reference signal of Syscon IC (playback Mode) to keep the constant phase, the difference value and speed difference are put out to D-PWM.

•

Capstan servo system keeps the constant speed and phase of tape. It prevents the trembling sound and the flow of the Noise band on screen. And it prevents a lot of Noise on screen by malfunction of Tracking.

•

In order to keep the constant speed, It's put out to C-PWM from caption Motor, DC-amplified in power curcuit and gets caption Motor drived.

•

By comparing with CTL signal from CTL Head connected with the lower section of A/C Head and the refeence signal of Syscon IC, the value and speed difference are put out to C-PWM.

2) VCR MODE IN NORMAL CONDITION (1) EJECT :

MODE that a casstte come out of compartment.

(2) STAND-BY :

MODE that a cassette is unloading.

(3) STOP :

MODE that a casstte is loading.

(4) FF :

Fast Forward MODE that moves the tape forward in STOP mode

(5) REW :

REWind MODE that moves the tape reversely in STOP mode

(6) REC :

RECord MODE that records video and audio signal on tapes.

(7) PAUSE :

record PAUSE MODE that makes recording stop.

(8) PLAY :

MODE that plays the record tape

(9) STILL :

play STILL MODE that playback is paused

(10) CUE & REV :

MODE that search the screen right or reversely.

7. NORMAL AUDIO CIRCUIT OPERATION

1. REC Mode

The signal put in to IU01 #16, is amplified at LINE AMP through ALC circuit in the IC. It is put out to speaker through #22. At the same time it is put out from #21 through High-Frequency compensation circuit by reso nance block. After the signal goes through the REC AMP, it's modulated to AM by frequency 70KHz, is recorded on a tape through R/P Head.

2. PB Mode

After the signal picked up at the HEAD is put in to pin #2 and performs to amplify and equalize frequency at each mode, it is supplied to OUTPUT #1 SW in IC. The signal is chosen as normal by Sound Ouptut control, is put in to LINE AMP again and is amplified. Then,it's put in to TV.

8. VIDEO CIRCUIT OPERATION

1. EE mode

VIDEO input signal is input to #31 of IY01 (LA7423A) and output to #28 of IY01 after it's multiplied 2 times at AGC and VIDEO AMP.

The signal is connected to VIDEO output terminal.

Page 45

4242

2. REC mode

•

Signal is put in to #31 of IY01(LA7423A), and it is seperated into Luminance and Chroma within IC.FM modulated luminance signal is put in to #34 and low-frequency transformed color signal is put in to #14. After passing through REC EQ, circuit for adjusting REC characteristics, FM modulated signal is put in to IY03(LA7411)#8 and color signal put out to #11 is put in to IY03 #3.

•

The signal put in to #7, #8 of IY03(LA7411) is recorded on the tape by HEAD through AGC and REC CUR RENT AMP.

3. PB Mode

•

In case of SP, the signals on #17, #20 of IY03(LA7411) are amplified to 60dB respectively by V.SW, put out to #7 IY03 and put in to #4 IY01(LA7423A)

•

FM signal put in to #14 of IY01 is demodulated at FM DEMODULATIOR after passing through FM EQ. within IC and put in to Y/C MIXER after passing through 3.0MHz LPF to eliminate color signal component.

•

While FM signal put in to #14 of IY01 is passing through 1.3MHz LPF. Only low-frequency transformed color signal passes. The color signal is converted to 3.58MHz at Main CONVERTER and is put in to Y/C MIXER after it's amplified to 6dB and goes through ACC/BURST EMPHASIS. Y/C signal is put out to #28.

VIDEO OUT

HA SW REC "H"

7.1M LPF

41 IY02 8 LC89960 IH CCD IC

REC EQ R/T

R/T

VIDEO IN

31 28

IY01

LA7423A

Y/C PROCESS IC

9111718

IY03 LA7411 814

PRE-AMP

IC 715 14

Page 46

■ IY03 (LA7411)

1. Case Outline : DIP-24S (300mil) Plastic Package

2. Application : VHS format VTR Record and Playback Head Amplifiers

3. Maximum Ratings at Ta = 25°C

4. Operating conditions at Ta = 25°C

5. Electrical Characteristics at Ta = 25°C

■■

IMPORTANT IC'S OPERATION

Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max 7.0 V Allowable power dissipation Pd max Ta ≦ 6.5°C 700 mW Operating temperature Topg -10 to +65 °C Storage temperature Tstg -40 to +150 °C

Parameter Symbol Conditions Ratings Unit Recommended supply voltage VC 5.0 V Operating supply voltage range VCC opg 4.80 to 5.50 V

Parameter Symbol

In- Out

Conditions min typ max Unit

-put -put

T1 T2

PB mode T12:5.0V T10:OPEN EP/ SW30

T4:OPEN (PB) SP MUTE

Current dissipation I CCP The current flowing

0141822mA

into pins 12

Voltage gain

L CH1 GVP 1 T17A T7A

Vi = 38mVpp. f = 1MHz

56.5 59.5 62.5 dB

H CH2 GVP 2 T20A 2.5 Voltage gain difference △GVP 1 GVP1-GVP2 -1 0 1 dB Input conversion CH1 VNIN 1 T17A T7A VOUT/GVP1.2 0

1.1 1.5

µVrms

noise distortion CH2 VNIN2 T20A after 1.1MHz LPF 2.5 Frequency CH1 △V fp 1 T17A T7A Vi=38mVpp. f=7MHz 0

characteristics CH2 △Vfp 2 T20A V OUT/GVP1.2 2.5 -2.5 1 dB

output ratio

Second harmonic CH1 V HDP 1 T17A T7A Vi=38mVpp. f=4MHz 0 -40 -35 dB distortion CH2 VHDP 2 T20A (8M component)/ 2.5

(4M component) Vi=38mVpp output ratio

Maximum output level

CH1 V OMP 1 T17A T7A f=1MHz 0 1.0 1.2 Vpp CH2 V OMP 2 T20A The output level when 2.5

the third harmoinic is-30dB.

Page 47

6. Pin Function Table

No Pin-function Type DC voltage(V) Input/Output configuration Remarks

1 HA (EP/SP)

2 RF-SW

(REC-MUTE)

3 H-SYNC

4 REC-H PB O

REC 5

5 ENV DET PB See attached

OUT sheet

REC 0

6 GND

2 2

7 PB-OUT PB 2.3

REC-C-IN REC 3.6

8 REC-Y-IN

REC 3.6

1kΩ

100kΩ 1.6V

COMP

20kΩ

80kΩ

1.2V

H.SYNC

COMP

20kΩ

80kΩ

1.6V

REC/PB

COMP

100Ω

20kΩ

1kΩ

50kΩ

3.2V

1.0V

COMP

RECMUTE

COMP

VCC

100Ω

25kΩ

5kΩ

300Ω

PB OUT

REC C IN

5kΩ

100Ω

EP SP

HCH

LCH

OFF

1.6V

Syac

REC

1.5V

2.0V

SW30 REC MUTE

1.0V 3.2V

Page 48

No Pin-function Type DC voltage(V) Input/Output configuration Remarks

9 AGC-FLT

PB 0

REC 1.6

10 REC-CUR

ADJ2

PB 2.5

REC 2.5

11 REC-CUR PB 4.5

ADJI

REC 5.0

12 VCC

13 REC-BIAS

PB 0

REC 1.7

14 REC-OUT

PB 0

REC 4.2

16 PB Amp 19 2'nd Filt

PB 2.0

REC 3.6

100

10k

20k

500

VCC

COMP

From REC ACC

COMP

16.7k

1.5k

3.3k

1.6k 10k

100

VCC

4V : +3.5dB

2.5V : ±0dB (OPEN)

1V : -6dB

Page 49

No Pin-function Type DC voltage(V) Input/Output configuration Remarks

PIN MODE STOP REC PLAY REW/FWD REV/FF PAUSE STILL

10000000 2 0 0 0 0 1.4 1.4 1.4 30000000 4 0 5.2 0 0 0.5 0 0 5 0.9 0 0.9 2.4 2.5 1.6 2.1 60000000 7 2.3 3.5 2.3 2.3 2.3 2.3 2.3 80000000

9 0 1.6 0 0 0 0 0 10 2.6 .2.6 2.6 2.6 2.6 2.6 2.6 11 5.1 4.3 5.1 5.2 5.2 5.2 5.2 12 5.1 5.2 5.1 5.2 5.2 5.2 5.2 13 0 1.7 0 0 0 0 0 14 0 4.2 0 0 0 0 0 15 5.2 5.2 5.2 5.2 5.2 5.2 5.2 16 2.1 3.8 2.1 2.1 2.1 2 2.1 17 0.7 0.7 0.7 0.7 0.7 0.7 0.7 18 0 4.2 0 0 0 0 0 19 2.1 3.8 2.1 2.1 2.1 2.1 2.1 20 0.7 0.9 0.7 0.7 0.7 0.7 0.7 21 0 4.2 0 0 0 0 0 22 0 0 0 0 0 0 0 23 0 0 0 0 0 0 0 24 0 0 0 0 0 0 0

17 PB-L-IN 20 PB-H-IN PB 0.7

REC 0

18 PB-L-SW 21 PB-H-SW

PB 0

REC 4.2

15 23 NC 24

REC ON

VCC

PB ON

ON resistance 4 to 6Ω

VIDEO PREAMP IC LA7411

7. Pin Operation

Page 50

■■

IY02 (LC89960)

1. Overview

The SANYO LC89960 is a 1H delay line for NTSC television systems. Only an external low-pass filter is required to implement a 1H delay line.

2. Features

• Single 5V power supply.

• 1H delay signal can be obtained with low-pass filter and 3.58MHz clock input.

• Minimum number of external components required because of timing generator, bias generator, output Amp, on

chipped.

• The phase of output signal is reversed to the phase of input signal.

3. Functions.

• 905 stage CCD shift register.

• Timing generator and clock driver for CCD.

• Auto-bias citcuit.

• Sync tip clamp circuit.

• Sample and hold circuit and output Amp.

• 4fsc clock generator with PLL circuit.

• VCO (4fsc) output circuit.

4. Absolute Maximum Ratings

Items Symbol Unit Min. max. Conditions supply voltage VDD V -0.3 +6.0 Ta = 25°C Operating Temperature TOPR °C -10 +60 Storage Temperature TSTG °C -55 +150 Allowable Power : Dissipation PD mW - 450 Ta = 25°C

PIN MODE STOP REC PLAY REW/FWD REV/FF PAUSE STILL

1 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2 2.5 2.5 2.5 2.5 2.5 2.5 2.5 30000000 42222222 50000000 60000000 70000000 8 1.2 1.2 1.2 1.2 1.2 1.2 1.2

9 5.2 5.2 5.2 5.2 5.2 5.2 5.2 10 2.1 2.1 2.1 2.1 2.1 2.1 2.1 11 2.1 2.1 2.1 2.1 2.1 2.1 2.1 12 5.2 5.2 5.2 5.2 5.2 5.2 5.2 13 9.4 9.4 9.4 9.4 9.4 9.4 9.4 14 0 0 0 0 0 0 0

Y/C CCD IC LC89960

5.Pin Operation

Page 51

■■

IY01 (LA7423A)

1. Case Outline : DIP-36S(400mil) Plastic Package

2. Application : VHS VTR Video signal Processor (Y/C single-chip)

3. Maximum Ratings at Ta = 25°C

PIN MODE STOP REC PLAY REW/FWD REV/FF PAUSE STILL

1 0 0 4.8 0 4.8 0 4.8 2 2.4 2.4 1.9 2.4 2 2.4 2 3 3 3 3.2 3 3.1 3 3.1 4 2.3 2.3 4.7 2.3 4.7 2.3 4.7 5 2.3 2.3 4.7 2.3 4.7 2.3 4.7 6 3.1 3.1 3 3.1 3 3.1 3 7 0 0 3.6 1.8 3.6 1.8 3.6 8 3.1 3.1 3.1 3.1 3.1 3.1 3.1

9 2.1 2.1 2.1 2.1 2.1 2.1 2.1 10 0 0 0 0 0 0 0 11 1.1 1.1 1.1 1.1 1.1 1.1 1.1 12 2.5 2.5 2.5 2.5 2.5 2.5 2.5 13 2.5 2.5 2.5 2.6 2.5 2.6 2.5 14 2.5 2.5 3.3 2.5 3.3 2.5 3.3 15 2.1 2.1 2.1 2.3 2.1 2.3 2.1 16 2.1 2.1 2.1 2.1 4.6 2 5 17 3.9 3.9 3.8 3.9 3.8 3.9 3.8 18 2.8 2.8 2.7 2.8 2.7 2.8 2.7 19 2.7 2.7 2.7 2.7 2.7 2.7 2.7 20 2.7 2.7 2.7 2.7 2.7 2.7 2.7 21 1.9 1.9 1.9 1.9 1.9 1.9 1.9 22 2 2 2 2 2 2 2 23 1.6 1.6 1.6 1.6 1.6 1.6 1.6 24 5.1 5.1 5.1 5.1 5.1 5.1 5.1 25 4.2 4.2 4.2 4.2 4.2 4.2 4.2 26 0 0 0 0 0 0 0 27 5.1 5.1 5.1 5.1 5 5.1 5 28 1.8 1.8 1.8 1.8 1.7 1.8 1.8 29 0 0 0 0 0 0 0 30 2.7 2.7 2.7 2.7 2.7 2.7 2.7 31 3 3 3.5 3 3.5 3 3.5 32 1.5 1.5 1.8 1.5 1.7 1.5 1.6 33 0 0 0 0 0 0 0 34 3.1 3.1 3.7 3.1 4.6 3.1 4.6 35 0 0 3.6 0 3.6 0 3.6 36 5.2 5.2 3.7 5.2 3.7 5.2 3.7

Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max 7.0 V Allowable power dissipation Pd max Ta ≦ 65°C 1070 mW Operating temperature Topg -10 to + 65 °C Storage temperature Tstg -40 to + 150 °C

Y/C 1CHIP IC LA 7423

4. Pin Operation

Page 52

No Pin-function Type voltage(V) Signal waveform Input/Output configuration Remarks

5. IY01 (LA7423A : Y/C PROCESS IC)

SYNC-DET

-OUT

1DC

S-DET-OUT

REC-Y REC = 2.4V

MADE. DE.

PB = 2.0V

EMPH-OUT

REC = 3.0V

3 CLAMP

PB = 3.2V

EMPH-OUT REC = 2.1V

R/P CTL PB = 4.4V

REC = 2.1V

5 MAIN-EMPH

-FILT PB = 4.4V

REC = 3V

6 NL FILT

PB = 3V

Page 53

No Pin-function Type voltage(V) Signal waveform Input/Output configuration Remarks

SP 0~1.5 [V]

7 MODE-CTL LP 1.5~3.2 [V]

EP 3.2~5.0 [V]

REC = 3V

8 VCA-FILT DC

PB = 3V

REC = 2.2V

9 VCA-IN

PB = 2.2V

10 GND 0V

REC = 1.0V

11 CCD DRIVE

PB = 1.0V

PIC-CTL REC = 3V SOFT : 2.0~2.5V

HARD : 2.6V~3.2V

EDIT

PB = 3V EDIT when over 3.5V

Page 54

No Pin-function Type voltage(V) Signal waveform Input/Output configuration Remarks

REC = 2.5V

13 NC-CTL

under 1.5V N.C OFF

2.0~3.0V N.C CTL

PB = 2.5V

over 3.8V Y/CMix

OFF (N.C. Center)

REC C-OUR REC =2.4V

PB-YC-IN PB = 3.2V

Y-FM

+Low Chroma

AGC-TC 1 REC = 2.4V

BALANCER PB = 2.3V

REC-APC- REC = 2.3V

16 FILT

TRICK-H PB = over 3.5V

(SP Mode)

REC = 3.8V

17 VXO-IN

PB = 3.8V

REC = 2.3V

18 XO-OUT

PB = 2.4V

Page 55

No Pin-function Type voltage(V) Signal waveform Input/Output configuration Remarks

REC = 2.8V

19 SLD-FILT

PB = 2.8V

AFC/APC

REC =2.8V

FILT

PB = 2.8V

REC = 1.9V

XO mode

when over 3.5V

21 C-OUT

PB = 1.9V

ANR ON

when over 3.5V

Color = 1.9V

22 KILL-FILT

Killer = 3.1V

REC = 1.7V

23 CNR-CD-IN

PB = 1.7V

CNR OFF

when over 2.5V

24 VCC-2 5.0V D.C

Page 56

No Pin-function Type voltage(V) Signal waveform Input/Output configuration Remarks

25 REG = 4.2 4.2V D.C

26 SYNC OUT

1.75V when CNR mode

27 VCC-1

28 VIDEO OUT

QV. QH INS.

CHARA INS

30 ROT-PLS

Page 57

No Pin-function Type voltage(V) Signal waveform Input/Output configuration Remarks

REC = 2.7V

31 VIDEO-IN

PB = 2.7V

REC = 1.6V

32 AGC-TC2 D.C

PB = 1.6V

REC = 0V

33 SVHS-FM-IN

PB = 3.7V

Normal

VHS 0V

MOD-OUT REC = 3.0V

DOC-STOP-H PB = 3.6V 3.95 DOC-STOP

REC = 0V

35 NOR-FM-IN

PB = 3.8V

REC = 1V

36 FM-EQ-OUT

PB = 3.8V

Page 58

■IU01 (BA7790LS)

1. FUNCTION

(1) Circuit essential for a standard sound signal processing system as a PB AMP, REC AMP, ALC circuit, EQ selecting

switch and high voltage head switch have been intergrated onto a single 1 chip. (2) Built-in LINE/TUNER INPUT selecting switch. (3) Built-in summary 3 mode EQ switch and it can be obtained EQ carateristics of each mode. (4) PB AMP is low noise and high performance. (5) Built-in ALC circuit with variable ALC level for setting. (6) No shock noise or ALC attack noise is generated when power source is turned ON or the mode is changed by means

of a ALC loop outside mute system.

2. Absolute Maximum Ratings (Ta = 25°C)

※ Derate 4.0mW/°C for the operating above Ta = 25°C

3. Recommended Operational Conditions (Ta = 25°C)

PIN MODE STOP REC PLAY REW/FWD REV/FF PAUSE STILL

10000000 2 4.6 4.6 4.6 4.6 4.6 4.6 4.6 30000000 40000000 5 11.2 11.2 11.2 11.2 11.2 11.2 11.2 6 4.7 4.7 4.7 4.7 4.7 4.7 4.7 7 11.4 11.4 11.4 11.4 11.4 11.4 11.4 8 4.7 4.7 4.7 4.7 4.7 4.7 4.7

9 0 0 3.8 0 3.7 0 0 10 4.7 4.7 4.7 4.7 4.7 4.7 4.7 11 0.6 0.6 5.2 0.6 5.2 0.6 5.2 12 5.3 5.3 5.3 5.3 5.3 5.3 5.3 13 4.6 4.6 4.6 4.6 4.6 4.6 4.6 14 0.6 0.6 0 0.5 0 0.5 0 15 5.4 5.4 5.3 5.4 5.3 5.4 5.4 16 5.3 5.3 5.3 5.3 5.3 5.3 5.3 17 0 0 0 0 5 0 5 18 5.3 5.3 5.3 5.3 5.3 5.3 5.3 19 5.4 5.4 5.3 5.3 5.4 5.4 5.4 20 0 0 0 0 0 0 0 21 5.4 5.4 5.3 5.4 5.4 5.4 5.4 22 5.4 5.4 5.3 5.4 5.4 5.3 5.3 23 0 0 0 1 0 0 0 24 0.5 5.2 0.5 0.5 0 0.5 0.5

Parameter Symbol Limits Unit Supply voltage Vcc 13 V Power dissipation Pd ※ 400 mW Operating temperature Topr -10~+65 °C Storage temperature Tstg -55~+125 °C

Parameter Symbol Range Unit Power supply voltage Vcc 7.5~12.5 V

AUDIO IC BA7790LS

4. Pin Opertion

Page 59

5. Terminal Function Table

NOTE :

• Terminal form abbreviations : EE : emitter follower, P-P : push pull, B : base, C : collector.

• All figures are measured at Vcc = 9V at no signal condition.

• All figures show standard values.

Terminal No. Description Function

Terminal

Termanal Form

Voltage

1 HEAD EQ Selecting swiitch of condenser 0.0V 220kΩ/27Ω(ON)

for head resonance

2 PB IN PB AMP input/PB side head switch 3.4V REC : 120kΩ

REC : 11Ω(ON)

3 REC HSW REC side high voltage head switch 0.0V REC : 11Ω(ON)

REC : OPEN 4 GND GND (for PB AMP, Head switch) 0.0V – 5 RIPPLE FILTER Ripple filter 9.0V 10kΩ(Vcc) 6 PB NFB PB AMP fecdback 3.5V B(NPN) 7 Vcc Vcc 9.0V – 8 PB EQ PB EQ selecting switch 3.5V 55Ω(ON)/OPEN 9 EQ CTRL EQ control –

10 PB OUT EQ AMP output 3.5V EE 11 PB/TU/EE CTRL PB/TU/EE control – 12 PB LINE IN Line input for PB 4.1V 120kΩ 13 ALC LEVEL ALC Level setting terminal – B(PNP) 14 ALC FILTER Terminal for ALC filter with time PB : 0.0V EE(NPN)~220Ω

constant PB : vari(Setting attack and recovery time) able

15 BIAS Bias 4.1V EE(NPN)

Isink = 670µA 16 LINE IN Line input 4.1V 120kΩ 17 MUTE CTRL MUTE control – 18 TUNER IN Tuner input 4.1V 120kΩ 19 REC NFB REC AMP feedback 4.1V B(NPN) 20 GND GND 0.0V – 21 REC OUT REC AMP output 4.1V EE(P-P) 22 BF OUT Line AMP OUTPUT 4.1V EE(P-P) 23 REC EQ REC EQ selecting switch 0.0V 100kΩ/22Ω(ON) 24 REC/EE CTRL REC/EE control –

Page 60

■■

IN05(BA6209)

1. Function : Reversible Motor Driver

2. Pin Operation

■■

IN03 (MC4558C)

1. Function : Dual wideband operational amplifier

2. Pin Operation

DUAL OP AMP MC4558C

■■

I503(TC4066BP)

1. Four independent circuits of bidirectional switches

2. Pin operation

SWITCHNG IC TC4066BP

PIN MODE STOP REC PLAY REW/FWD REV/FF PAUSE STILL

1 3.2 3 3.3 3.3 3.3 3.2 3.4 2 3.1 3 3.2 3.2 3.2 3.2 3.2 3 3.1 3 3.2 3.2 3.2 3.3 3.3 40000000 5 2.8 2.7 3.3 3.3 3.3 3.6 3.6 6 0.9 0.9 3.2 3.2 3.2 3.3 3.3 7 1.4 1.4 3.7 3.7 3.7 5.3 5.3 86666666

PIN MODE STOP REC PLAY

1666 2 5.3 0 5.3 3000 4000 5 3.5 0 0 6 3.5 0 0 7 3.6 4.2 4.1

PIN MODE STOP REC PLAY

8000

9 5.7 0 0 10 0 5.7 0 11 3.8 3.7 4 12 2.3 3.8 2.6 13 2.3 3.8 2.6 14 2.3 2.6 2.6

IN05 BA6209 LM DRIVE

CND

V.OUT1

VZ.1

V.REF

F.IN

R.IN

VCC1

VCC2

VZ.2

V.OUT2

CN10

0.0Iμ

RN21

3.9 2W

MOTOR 12V

To DECK

CCN11

0.01

DN13

ZPD 6.2

RCN 22

3.3K

CN35 100U

25V

51 50

Pin 51 : LM ON(H) Pin 50 : LM (+)/(-)

IN01

LM (+) LM (-)

12345678910

Page 61

Item Symbol

Measurement

Min Typ. Max. Unit

Condition Drive current Icc1 1 2.0 5.0 12 mA Trig input threshold Voltage V2 2 ––1.0 V

Vertical range control voltage (1) V60/3 3 1.0 1.5 2.0 V Vertical range control voltage (2) V50/3 11 0.75 1.25 1.75 V Maximum output voltage V5 4 3.5 4.8 6.0 V Macimum peak to peak Voltage V5P-P 4 3.5 4.5 5.5 VP-

Output transistor saturation Voltage(1) Vs11-10 5 0.3 0.5 1.0 V Output transistor saturation Voltage(2) Vs12-11 6 1.0 1.8 3.6 V Pump up output Voltage (1) Vs7-8 7 1.0 2.0 3.0 V Pump up output Voltage (2) Vs8-10 8 0.2 0.8 1.6 V No signal Current Ib 9 – 2.6 – mA Center Voltage V

CENTER

10 8.0 12.0 14.0 V

■■

I301(TA8445K)

1. Operating Conclitions (Ta = 25°C)

2. Operating Caracteristics (Ta = 25°C, Vcc1 = 9V, Vcc2 = 24V)

Item Symbol Min Typ. Max. Unit

Drive vcc V

1 8.1 9.0 9.9 V

Pump up Vcc V

2 – 2.4 2.9 V

Vertical Output Vcc I

P-P

––2.2 Ap-p

RAMP GENERATER

Drive Vcc

INPUT

V. SIZE

50/60 SW

RAMP

V. NFB

Pump up Vcc

Pump up output

Phase compensation

GND

V. OUT

Output Vcc

①② ③④⑤ ⑥⑦⑧⑨⑩⑪⑫

Vertical trig

50/60Hz

S/W

Pump up

Vertical Drive Vertical Out

Page 62

■■

IN01 (Syscon : TMP91C642AN-3178)

SYSCON IN01

PIN MODE STOP REC PLAY REW/FWD REV/FF PAUSE STILL

1 5.2 5.2 5.2 5.1 5.1 5.1 5.1 2 3.5 3.4 3.8 3.5 3.6 3.6 3.7 3 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4 5.2 5.2 5.2 5.2 5.2 5.2 5.2 50000000 6 5.2 5.2 5.2 5.2 5.2 5.2 5.2 70000000 80000000

9 3.6 3.1 3.3 3.3 3.3 2.8 3.6 10 2.8 2.8 2.8 2.8 2.8 2.8 0 11 5.2 0 0 0 5.2 5.2 0 12 0 0 0 0 0 0 0 13 5.2 5.2 5.2 5.2 5.2 5.2 5.2 14 0 var var var var 5 0 15 0 0 0 0 0 0 0 16 0 0 0 0 0 0 0 17 5 2.6 2.5 2.5 2.6 2.6 2.6 18 0 4.8 4.8 4.8 4.8 4.8 4.8 19 0 2.7 2.7 2.7 2.7 2.7 2.7 20 4.7 3.2 3.2 3.2 3.2 4.7 4.7 21 5.2 5.2 5.3 5.3 5.3 5.3 5.3 22 0 0 0 0 0 0 0 23 0 2.6 2.6 2.6 2.6 2.6 2.6 24 0 0 0 0 0 0 0 25 0 0 0 0 0 0 0 26 4.5 var 3.9 3.8 3.8 0 3.8 27 3.7 3.7 4.2 3.8 3.8 3.8 3.8 28 3.7 3.7 4.2 3.7 3.7 3.7 3.7 29 0 0 4.7 0 4.7 0 4.7 30 2.4 2.4 2.5 2.4 2.5 2.4 2.5 31 0 2.8 2.8 2.8 2.8 0 5.2 32 0 0 0 0 0 0 0 33 0 0 0 0 0 0 0 34 0 0 0 0 0 0 0 35 5.2 0 5.2 5.2 5.2 5.2 5.2 36 5.2 5.2 0 5.2 0 5.2 0 37 0 5.2 5.2 5.2 0 5.2 0 38 5.2 0 0 0 0 0 0 39 2.9 5.2 5.2 5.2 5.2 5.2 5.2 40 5.2 3.1 3 3 3 2.9 2.9 41 0 5.2 5.2 5.2 5.2 5.2 5.2 42 0 0 0 0 5.2 0 5.2 43 0 0 0 0 0 0 0 44 5.2 5.2 5.2 5.2 5.2 5.2 5.2 45 2.5 2.5 2.5 2.5 2.5 2.5 2.5

Page 63

PIN MODE STOP REC PLAY REW/FWD REV/FF PAUSE STILL

46 5.2 5.2 5.2 5.2 5.2 5.2 5.2 47 2.2 2.2 2.2 2.2 2.2 2.2 2.2 48 2.1 2.1 2.1 2.1 2.1 2.1 2.1 49 0 0 0 0 0 0 0 50 0 0 0 0 0 0 0 51 0 0 0 0 0 0 0 52 0 0 0 0 0 0 0 53 0 0 0 0 0 0 0 54 2.1 3.5 3.5 3.5 2.1 3.5 3.5 55 2.6 2.6 2.6 2.1 5.2 2.6 2.6 56 5 5 5 5 5 5 5 57 5.2 5.2 5.2 5.2 5.2 5.2 5.2 58 5.3 5.3 5.3 5.3 5.3 5.3 5.3 59 3.1 3.1 3.1 3.1 3.1 3.1 3.1 60 0.6 0 2.9 2.1 2.4 1.8 2.1 61 5.3 5.3 5.3 5.3 5.3 5.3 5.3 62 5.3 5.3 5.3 5.3 5.3 5.3 5.3 63 0 0 0 0 0 0 0 64 5.3 5.3 5.3 5.3 5.3 5.3 5.3

Page 64

PIN PIN NAME PIN DISCRIPTION

1 S/CLK Serial Clock 2 S/OUT Serial OUT, Contact with TIMER IC Serial IN 3 S/IN Serial IN, Contact with TIMER IN Serial OUT 4 SYNC (L) NOT USED 5 VCR/ON(L) NOT USED 6 LINE/TV NOT USED 7 NOT USED 8 C/SYNC Composite Sync 9 SLOW STEP Adjusting Vth of CTL/P, Set concerned area on 'L' when SLOW mode

10 C. I LIMITER Limit the current of CAP. M/T

Set on 'L' when SLOW MODE 11 CAP F/R Switching foward(H)/reverse(L) of CAP. M/T 12 C/SYNC Composite SYNC 13 REMOCON IN REMOTE controller signal 14 REEL PULSE Take Up Reel Pulse IN 15 STROBE Port to have S.DATA with TUNER 16 RENTAL(H) Set on 'H' when rental 17 D/FG Drum FG 18 D/PG Drum PG 19 C/FG Caption FG 20 PB/CTL Caption APC, SLOW & RTC & VISS DETECT 21 EVER 5.3V EVER 5.3V 22 QV/SYNC WHen special play, Quasi Vertical SYNC 23 V/SW Video head Switcing 24 A/SW Audio head Switching 25 H. A. SW Video head switching out, SP(L) 26 REC-LED(L) Light up when REC 27 STAND-BY(L) Light up when STAND-BY 28 T. REC Lights up when timer recording stand-by and blinks when timer recording REPEAT

Page 65

PIN PIN NAME PIN DISCRIPTION

29 AUDIO SLP(H) Set 'H' When SLP mode. 30 D/PWM Drum motor control PWM output

*period of PWM : 23.4KHz (6MHz/256)

31 C/PWM Capstan motor PWM output

* period of PWM : 23.4KHz (6MHz/256) 32 GND(D) Digital GND 33 NOT USED 34 CST IN(L) NOT USED 35 REC(L) Set 'L' when recording 36 EE(H) Set 'H' when EE/REC mode with TIME delay, in case of VIDEO mode 37 TRICK (L) Set 'L' when special play, Audio MUTE output 38 SP(L) tape speed SP(L) output 39 LP(L) tape speed LP(L) output 40 R/CTL Change Record CTL DUTY when MARK & ERASE mode 41 2HD/4HD 4HD (L) OR 2HD (H) 42 A. MUTE (H) Audio Mute output when special record 43 NTSC(L) NTSC(L)/PAL(H) switching output 44 SP TRICK(L) Set 'L' when SP mode 45 CLK NOT USED 46 RESET(L) RESET 47 OSC/IN SYSTEM CLOCK CRYSTAL(10MHz) 48 OSC/OUT SYSTEM COCK CRYSTAL (10MHz) 49 GND 50 LM(+)/LM(-) Loading motor foward(L), reverse(H) 51 LM ON(H) Set 'H' when operates loading motor 52 T/START(L) Tape START sensor input 53 T/END(L0 Tape END sensor input

Page 66

PIN PIN NAME PIN DISCRIPTION

54 CAM A CAM Detection input port 55 CAM B

CAM C CAM D

56 KEY 1 & VTR function key input 57 KEY 2

58 TRK DLY PATH adjustment TRACKING DELAY 59 PG DLY PG DLY adjustment * PG DLY adjustment range

5.625 degree – 11.25 degree – 28.125 degree (0V) – (CENTER) – (5V)

60 ENVE DET. *Maximum POINT SEARCH DC ENVE input

*AUTO TRACKING RESTART CONDITION.

(SP : 2~5V, SPL, LP : 1.5`5V)

• CASSETTE IN 󱈇 in play mode

• when tape speed is changed, in play mode

• PB/CTL PULSE off 󱈇 PB/CTL PULSE on

61 SYSTEM SEL NOT USED 62 EVER 5.3V EVER 5.3V 63 GND(A) Analogue GND 64 EVER 5.3V EVER 5.3V

POWER A B C D MODE

2.9 ~ 3.7 L H H H EJECT 4.35(H)

3.7 ~ 4.5 L H H L STAND-BY(INITIAL) 4.35(L)

2.2 ~ 2.9 H H H L REV 5.30(L)

2.9 ~ 3.7 H H L L STOP 2.65(L)

0.0 ~ 2.2 H H L H PLAY, QUE 2.65(H)

2.2 ~ 2.9 H L H L FF/REW 2.10(L)

4.5 ~ 5.0 H H H H CAM 5.0(H)

Page 67

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I701(Timer : M37267M6 - 101SP)

1. Pin Layout

1 HSYNC P52/R 52 2 VSYNC P53/G 51

3 P40/MXR/AD4 P54/B 50 4 P41/INT2/MXG P55/OUT1 49 5 P42/TIM2/MXB P04/PWMO 48 6 P43/TIM3/MXOUT P05/PWM1 47 7 P24/AD3 P06/PWM2 46 8 P25/AD2 P07/PWM3 45

9 P26/AD1 P20 44 10 P27 P21 43 11 P00/PWM4 P22 42 12 P001PWM5 P23 41 13 P02/PWM6 P10/OUT2 40 14 P17/SIN P11/SCL1 39 15 P44/INT1 P12/SCL2 38 16 P45/SOUT P13/SDA1 37 17 P46/SCLK P14/SDA2 34 18 AVCC P05 35 19 HLF P16 34 20 RVCO P03 33 21 VHOLD P30 32 22 CVIN P31 31 23 CNVSS RESET 30 24 XIN P64/OSC2/XCOUT 29 25 XOUT P63/OSC2/XCIN 28 26 VSS VCC 27

HSYNC INPUT VSYNC INPUT

AFT INPUT

N. C.

SYNC DETECT INPUT

N. C. N. C. N. C.

MONITOR POWER ON(L) OUTPUT

SERIAL STROBE OUTPUT

TINT PWM OUTPUT

COLOT PWM OUTPUT

PLL STROBE OUTPUT SERIAL DATA OUTPUT POWER FALL OUTPUT

SERIAL/PLL DATA OUTPUT

SERIAL/PLL CLOCK OUTPUT

+5V

R,C FILTER CONNECT

R CONNECT C CONNECT

COMPOSITE VIDEO INPUT

GND MAIN CLOCK (4.19MHz) MAIN CLOCK (4.19MHz)

GND

R OUT G OUT B OUT BLINKING OUTPUT CONTRAST PWM OUTPUT BRIGHT PWM OUTPUT SHARPNESS PWM OUTPUT VOLUME PWM OUTPUT AUDIO MUTE (H) OUTPUT VIDEO MUTE (H) OUTPUT TV(L)/AV/(H) OUTPUT VER SW OUTPUT

N. C.

EEPROM CLOCK OUTPUT

N. C.

EEPROM DATA INPUT/OUTPUT N. C. N. C. N. C. N. C. N. C. N. C.

RESET INPUT

SUB CLOCK(32.768KHz)

SUB CLOCK (32.768KHz)

+5V

M37267M6 - 101SP

Page 68

2. Pin discription

PIN NO NO NAME DISCRIPTION 1/O ACTIVE

1 HSYNC HSYNC HSYNC INPUT TERMINAL I

2 VSYNC VSYNC V SYNC INPUT TERMINAL I

3P40/MXR/AD4 AFT AFT SIGNAL INPUT TERMINAL I

4P41/INT2/MXG N. C. NOT USED –

5P42/TIM2/MXB SD SYNC DETECT INPUT TERMINAL I HIGH

6P43/TIM3/MXOUT N. C. NOT USED –

7P24/AD3 N. C. NOT USED –

8P25/AD2 N. C. NOT USED –

9P26

/AD1 MONITOR ON MONITOR POWER ON OUTPUT SIGNAL O LOW

10 P27 S. STROBE SERIAL STROBE OUTPUT SIGNAL O LOW

11 P00/PWM4 TINT TINT PWM OUTPUT SIGNAL O

12 P01/PWM5 COLOR COLOR PWM OUTPUT SIGNAL O

13 P02/PWM6 PLL STROBE PLL STROBE OUTPUT SIGNAL O

14 P17/SIN S. DATA IN SERIAL DATA INPUT SIGNAL I

15 P4

4/INT1 POWER FALL POWER DATA INPUT SIGNAL I LOW

16 P45/SOUT S. DATA OUT SERIAL/PLL DATA OUTPUT SIGNAL O

17 P46/SCLK S. CLOCK SERIAL/PLL CLOCK OUTPUT SIGNAL O

18 AVcc AVCC Analoge Vcc(+5V) –

19 HLF HLF R,C FILTER CONNECT TERMIANAL

20 RVCO RVCO R CONNECT TERMINAL

21 V

HOLD

V HOLD C CONNECT TERMINAL

22 CV

CVIN Composite video INPUT TERMINAL I

23 CNV

GND ANALOGE GND terminal –

Page 69

PIN NO NO NAME DISCRIPTION 1/O ACTIVE

24 XIN X IN MAIN CLOCK (4.19MHz) I

25 XOUT X OUT MAIN CLOCK (4.19MHz) O

26 VSS GND MAIN CPU GND TERMINAL –

27 VCC VCC

MAIN CPU POWER TERMINAL (+5 CONNECT)

–

28 P63/OSC2/XCIN OSC2 SUB CLOCK (32.768KHz) I

29 P64/OSC2/XCOUT OSC1 SUB CLOCK (32.768KHz) O

RESET

RESET CPU RESET INPUT TERMINAL I LOW

31 P31 N. C. NOT USED –

32 P30

N. C. NOT USED –

33 P03 N. C. NOT USED –

34 P16 N. C. NOT USED –

35 P05 N. C. NOT USED –

36 P14/SDA2 N. C. NOT USED –

37 P13/SDA1

E2PROM DATA

E2PROM DATA IN/OUT TERMINAL I/O

38 P1

2/SCL2 N. C. NOT CONNECTED I

39 P11/SCL1

E2PROM CLOCK

E2 PROM CLOCK OUTPUT TERMINAL O

40 P10/OUT2 N. C. NOT CONNECTED O

41 P23 VER SW 0

42 P22 TV/AV TV (L) AV(H) OUTPUT TERMINAL O

43 P21 V MUTE VIDEO MUTE(H) OUTPUT TERMINAL O HIGH

44 P20 A MUTE AUDIO MUTE(H) OUTPUT TERMINAL O HIGH

45 P07/PWM3 VOLUME VOLUME PWM OUTPUT TERMINAL O

46 P06/PWM2 SHARP SHARPNESS PWM OUTPUT TERMINAL O

Page 70

PIN NO NO NAME DISCRIPTION 1/O ACTIVE

47 P05/PWM1 BRIGHT BRIGHT PWM OUTPUT TERMINAL I

48 P04/PWM0 CONTRAST CONTRAST PWM OUTPUT TERMINAL O

49 P55/OUT1 BLANK BLINKING OUTPUT TERMINAL O

50 P54/B B B OUTPUT TERMINAL O

51 P53/G G G OUTPUT TERMINAL I

52 P52/R R R OUTPUT TERMINAL O

Page 71

■■

I501 (CHROMA IC : M52335SP - 600)

1. Pin Layout

1501

M52335SP

RF AGC OUT

VIDEO OUT

AFT OUT

AFT DEFEAT

SIF IN VIDEO VCO COIL VIDEO VCO COIL

TV IN

SYNC IN

Y SW OUT

EXT. VIDEO IN

Y IN

VIDEO TONE CONT.

PEDESTAL CLAMP

CHROMA IN/

BRIGHT CONT.

GND-2(VCJ)

CONTRAST CONT

KILLER FILTER

BLACK HOLD

ACC FILTER

CHROMA OSC

APC FILTER

FAST BLK IN

TINT. CONT.

OSD R

OSD G

EXT AUDIO IN SOUND DET COIL SOUND DET OUT AF OUT IF AGC FILTER RF AGC DELAY ADJ GND-1(VIF, SIF) VIF IN VIF IN VCC-1(VIF SIF) APC FILTER VCC-2(DEF) AFC FILTER AFC FBP IN 32fH OSC X-RAY PROTECT COINCIDENCE OUT V. OUT Vcc-2(VC) H. OUT COLOR CONT

- Y OUT R-Y OUT G-Y OUT B-Y OUT OSD B

ATT

AMP

DET

VIDEO

AFT VCO

APC

SEP

SYNC

AMP

VIF

AMP

VIF

GND VCC+9V

V/SIF

SIF

Y SINC

BGP

Y DL

STRECH

BLACK

TONE

VIDEO

RAST

CONT

BRIGHT

Y AMP

AFC2

BLK

SEP

AMP

CHROMA

AMP

CHROMA

DET

ACC/KILLER

APC DET

+9V

VCC

AFC

HCD VCO

OSD

TINT

NTSC

±45

OSC

32fH

DET

COINCIDENCE

VCC+9V

DET

LOCK

LIM

AGC

52 51 50 49 48 47 46 45 44 43 42

40 39 38

37 36 35 34 33 32 31 30 29 28 27

23 24 25 26

12 13 14 15 16 17 18

20 21 22

2 3 4 5 6 7 8 9

10 11

Page 72

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

EXT

1 AUDIO 3.25V

SOUND

2 DET 2.5V

COIL

SOUND 3.75V

3 DET (Varying with

OUT coil position)

4 AF OUT 4.2V

The Input impedance is 18kΩ. Add a blas to outside as shown right for use.

The EM detector is a quadrature detector and externally connects a tank coll or discriminator. This is also used as an AV switching pin to apply voltage through a 10kΩ.

GND to EXT(Y-DL) OPEN to TV(Y-DL) Vcc(5V) to TV(S input)

Sound direct output pin. for de-emphasis, connect a capacitor between this pin and GND.

Sound putput pin through ATT.

4.5V

4.7k

3.9k

18k

2.4k

25k

10k

25k

30p

20p

10k

0.01

µF

4.5V

18k

2.4k

5.0V9k

23k

2. DESCRIPTION OF PIN

Page 73

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

IF AGC

4.4 to 1.5V

FILTER

RF AGC

––––––

DELAYDJ.

GND-1

––––––

(YIF SIF)

VIF IN 1.5V

Vcc-1

(VIF SIF)

11 APC FILTER 3V

Dynamic AGC circuit is used to improve AGC response characteristics. Set a filter constant to avoid a sag around 70dBµ.

RFAGC delay point is set by the voltage applied to this pin.

Input resistance is 1kΩ. Input capacitance is 7pF.

The f characteristic of a loop in the locked state can be set by R. Normally set to in the range of 100 to 150kHz.

DESCRIPTION OF PIN (cont).

7.5k

1.5V

1.2k

320

4.4V

IF AGC Voltage

50dBµ

70dBµ

100dBµ IF Input

3.4k

60p

14k

V11

IF frequency

11 pin

Output

fc frequency

Page 74

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

12 H. Vcc

13 AFC FILTER 6.25V

14 AFC FSP IN

15 32H OSC 3.8V

X-RAY

PROTECT

Power supply pin for horizontal and vertical systems. it'scurrent is about 34mA.

Horizontal AFC filter pin. Action against VCR skews can be taken by increasing an external resistor R to provide a faster response speed, However, horizontal jitters in a weak electric field will increase.

Flyback pulse is sliced on 4V to generate an AFC2 detector pulse. Remember that any peak around 4V may cause jitters. The screen moves rightward by integrating and entering the flyback pulse.

CSB500F18 is used.

Applying voltage of 0.7V or more operates the Xray protector. connect to GND if not using the pin.

DESCRIPTION OF PIN (cont).

6.25V

24k

1.35k

FDP

300

300300300

CSB 500F18

1.2k

󱎜

Page 75

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

COINCIDEN-

8V(Synchronous)

CE OUT

0V(Asynchronous)

18 V.OUT

19 Vcc-2(VCJ) 9V

20 H.OUT

COLOR

4.5V

CONT.

Voltage goes up if a sync signal is entered and horizontal AFC is locked; otherwise, the voltage goes down. therefore, the pin can be also used as a MUTE detector. At that time, pay attention to high impedance.

Pulse as shown below is putput.

Power supply for VC, AFT, RF AGC and SIF DET.

Horizontal pulse of 24 µ s wide is output. It is open emitter output.

Color control pin. Its voltage goes to. 0V when service SW is ON.

DESCRIPTION OF PIN (cont).

33k

200

60k

30k

200

5.6k

10k

4.5V

Killer Service SW

640

3.8V

Page 76

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

20 Y. OUT

23 R-Y OUT 24 G-Y OUT 5.4V 25 B-Y OUT

26 OSD B 27 OSD G 28 OSD R

29 TINT CONT. 4.5V

Video output pin. when a flybaxk pulse is entered for blanking from outside, a blanking pulse is entered internally and a chroma symbol is also blanked. The blanking threshold voltage is 7.1V.

Open emitter output with maximum current of about 5mA.

Input impedance is 50kΩ. apply voltage of

2.5V or more ewhen insedring a character signal.

Tint control pin.

DESCRIPTION OF PIN (cont).

200

10k

30k

10k

600 200

300

50k

Vth

2.5V

12k

4.5V

Page 77

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

30 FAST BLK IN

31 APC FILTER 6.5V

CHROMA

6.8V

OSC

33 ACC FILTER

Applying voltage of 2.5V or more causes blanking

Cap challenge is changed by R. As R is decreased, the cap chaltenge becomes narrower, but phase, jitters are reduced.

Use XTAL of series capacitance type.

As R is decreased, chroma output increases but ACC is not activated smothly.

DESCRIPTION OF PIN (cont).

300 300

M351T01

300

50k

Vth

2.5V

666 666

1.6k

22k

Vcc

Page 78

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

1.15k 375 2k

1.5k 1.5k

1.7k 3.2k

4.7k

200

40k

20k

BLACK

About 3.2V

HOLD

KILLER 7.6V FILTER at signal input

Normally 4.8V

36 CONTRAST Applied

from outside

GND-2

(VCD)

CHROMA IN/

4.5V

BRIGHTNESS

Pin holding the most dark part of a video signal. As R is increased, the black peak is held; contrarily, the peak gets cloaer to an average.

To decrease killer sensitivity, connect a several M of resistor between the pin and GND.

Can be controlled by

5.1V center

Chroma signal standard. Make an entry at 200mV

P-P

. This pin is also used as a brightness control pin. DC reproduction ratio is 100%.

DESCRIPTION OF PIN (cont).

670

100

40k

20k

33p

30p

4.5V

Page 79

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

PEDESTAL

About 2.2V

CLAMP

VIDEO TONE

4.5V

CONT.

41 Y IN 3.3V

EXT VIDEO

Used to connect a hold capacitor.

Sharpness control pin. By increasing voltage, the pin is set to soft side.

Make an entry at low input impedance to avoid pedestal clamp. Standard coupling capacltor is 0.1µ F. Make an entry at 0.5Vp-p.

Make an entry at 1Vp-p.

DESCRIPTION OF PIN (cont).

1.4k

15k

1.5k

6.2k

4.5V

10k

1.4k

1.2k

1.07k

3.9k 1k

Page 80

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

1.125k

7.35V

2.5V

40k

150

43 Y SW OUT 2.5V

44 SYNC IN. 6.6V

45 TV IN 2.5V

VCO COIL 4V

Output at 1.5Vp-p.

Sync separation of emitter input type. Vertical sync separation is done inside the 1C.

Make an entry at 1V p-p.

Reference tuning capacitance is 27pF. As the capacltance is decrease, the variable range becomes wider but stabllity becomes worse.

DESCRIPTION OF PIN (cont).

850 850

Page 81

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

48 SIF IN/ATT 4.5V

AFT

DEFEAT

50 AFT OUT 8.2 to 0.5V

51 VIDEO OUT

Volume control pin.

Applying voltage 0f 2.5v or more defeats AFT.

Current output type. As load resistor R is increased, detector sensitlvity becomes higher but offlot becomed larger.

Output at 1.4Vp-p 1.75V is applied to sink tip.

DESCRIPTION OF PIN (cont).

10k

23.3k

4.5V

10k

2.4k

15k

29.3p

20p

7.5k

12.5k

32.5k

2.7k

250

Page 82

Name

Voltage and

Peripheral circuit of pins Description of function

No. wave Information

52 RF AGC OUT

current output type. Max. 0.4mA.

DESCRIPTION OF PIN (cont).

0.4mA

Page 83

① IY01 PIN 14 (PB ENVELOPE) ② IN03 PIN 1(CTL HEAD –)

■■

IMPORTANT SIGNAL WAVEFORMS

③ IY01 PIN 2 (PLAY) ④ IN01 PIN 20 (CTL PULSE)

⑤ I501 PIN 38 ⑥ IY01 PIN 2 (REC)

Page 84

⑦ I501 PIN 43 & IY01 PIN 31 VIDEO ⑧ IY01 PIN 28 VIDEO OUT (PLAY)

⑨ IY01 PIN 26 (C SYNC) ⑩ P504 PIN 4 (-Y)

⑪ PH502 PIN 2 (HEATER PULSE)

Page 85

■■

AUDIO WAVE FORMS.

① (IU01-3) REC ② (IU01-10) PLAY ③ (IU01-12) PLAY ④ (IU01-16) REC

⑤ (IU01-21) REC ⑥ (IU01-22) REC

⑦ (IU01-23) REC (SP Mode)

⑧ (LU06-7) REC

Page 86

1. POWER SUPPLY UNIT

2. VERTICAL, HORIZONTAL UNIT

3. SERVO/SYSCON UNIT

4. VIDEO UNIT

5. AUDIO UNIT – Before Troubleshooting, Read followings.

• Picture is not appeared when occurs following items.

1) When power supply is not supplied

2) When horizontal output TR is dead

3) When operation of over current protecting circuit.

4) When +125V is not supplied to FBT.

• Suggestions when service power supply unit.

1) When change components of trouble part, disconnect Power pulg and discharge voltage across both terminals of C806 completely. (use scores of KOHM resistance on the outside)

2) When examine the priwary circuit using oscilloscope, insulate oscilloscope surely and connect to the primary GND.

3) Check Fuse and cement resistance when change trouble part.

4) Check soldering conditions of heat sink and other parts after completing services.

■■

TROUBLESHOOTING ACCORDING TO CAUSE AND SYMPT OM

Page 87

1. Power supply unit

TV is not turned ON

Is AC power Supply Input

Is Voltage output from both

terminals of C806 ?

Are I804, I805,I806

operated ?

Is Voltage of pin 40

of I701 "L" ?

Check P803 pin 2 125V

Is waveform of base

of Q301 normal?

Is feedback Voltage of T801 TRANS normal ?

Be all right

Yes

Are diodes operated?

D802, D803, D804, D805

Check F801 & Power code

Check R803, C806

Are D811, D812, D813, D814

operated?

Check D811, D812, D813,

D814

Check each Regulator IC

I804, I805, I806

Check I701

Check D814 and trans

Check I701 1, 2

Check I801 STRS-5707

Check the secondary

circuit

Check L801, D802, D803,

D804, D805

Page 88

– check 125V unit

Does over current protecting

circuit operate ?

Are voltages on base & collec-

tor terminal of Q402 normal ?

Is 180V of FBT output

normal?

Is FBP correct ?

Check CRT PCB

Yes

Is 26.5V of FBT output

normal?

Check R832, R809

Check R301 and D301

Check R403 and D401

Check I301

Check FBT

Change

R301 and

D301

Change

R403 D401

Check T401 and Q402

Page 89

2. VERTICAL, HORIZONTAL UNIT .

Horizontal Line is only

appeared on the screen.

Are 25V and 9V supplied

at pin 7 and pin 1 of I301 ?

check a waveform at pin

5 of I301

check a waveform at pin

11 of I301

Checking connecting

part of DY

Be all right

Yes

Is waveform at pin 2 of I301

normal ?

Check I701 pin 2

Check C312

Check I 301

Resolder

Check power circuit

Page 90

Horizontal screen is abnormal

Is collector waveform of

Q402 normal ?

Check R406, C413, L402, C409, D404,

R407.

Be all right

Yes

NoYes

Check the capacity of C412 and

soldering condition.

Check T401

and L401

Check T402

pin 10

Is base waveform of

Q401 normal ?

Page 91

3. SERVO/SYSCON UNIT

Playback picture is not good.

Noise appears although

adjusting tracking

Yes

Noise shakes up and down

on the screen.

Is CTL pulse applied to

pin 7 of IN03 ?

Is CTL pulse applied to

pin 20 of IN01 ?

Check IN 01

Noise appears although

change cassette tape.

Check and

readjust the

path of Deck

Check PY 03

and CTL Amp

circuit IN03

Adjust tracking

Page 92

Playback picture

is not good.

Noise appears over

the entire screen

Yes

Are SW pulse

applied to

PRE-AMP circuit ?

Is Enve. waveform

supplied to pin 3

of PY 09

Check VIDEO circuit.

Is SW pulse suppiled

from pin 23 of IN01

Check connector, Head

Amp and Clean heads.

Check D. PG

input IN01 pin

18 and connector

(PY04)

Check patten

Yes

Instrument goes to

auto stop during

playback

Is Reel pulse applied

pin 14 of IN01

Check REEL

sensor part.

Check connector

PY03

Is D. FG applied to

pin 17 of IN01

Check IN01

The entire screen scrolls up and down

Check P.G Adjustment

Page 93

Durm Motor dose not rotate.

Is Motor 12V supplied

to PY04 pin 1

Is D. PWM applied

pin 30 of IN01 ?

Is I805 operated ? Check I805

Check PY04 and

RCN47, RN44, CN21,

CCN44

Check IN05

Check connector PY04 and

DRUM Motor

Capatan Motor does not rotate.

Is Motor 12V supplied to

PY03 pin ⑦ ?

Chock I805

Is the voltage of pin ⑥

PY03 2~3.5V ?

Check circuit of RN77, RN76,

RN75

Is the voltage of PY03

pin ④ 2.5V ?

Check RN67, RN66

Is CAP. PWM applied pin 31

of IN01 ?

Check IN01, PY03,

RN48, RN46, CN43,

CN22, RN50

Check connector PY03

and capstan motor

Yes

Page 94

Durm Motor and Capstan

M/T rotate at irregular speed

(In REC mode)

The instrunment goes into the

emergency mode. Though AC power is

connected, STAND-BY LED blinks.

Is EVER 6V supplied ?

Check I803

Check IN01 and XN01

Check connector

PAN04 CAM SW in

DECK Mechanism

Does XN01 crystal oscillate ?

Is CAM SW DATA at pin

54 and 55 of IN01 Correct?

Check IN05 and loading motor.

Check IN01

Is C. sync applied to

pin 12 of IN01

Check C. Sync (PIN26) of

VIDEO IC (IY01) and patten

Check IN01

Yes

Page 95

Cassette loading inoperative.

Is Motor 12V

IN05 pin ⑦ and ⑨ supplied ?

Check I805

Check connector PAN04 pin

⑦, ⑥, ⑤ and ④

and CAM SW and

DECK Mechanism

Is 5V supplied at pin

of IN01?

Check pattern.

Check DN13, RCN22, RN21

Check IN01

Are there changes in the cam

data when the cassette is in ?

Is 6V applied to pin ④ of IN05

when casette IN ?

Is 5V applied to pin ⑥ of IN05

when cassette IN ?

Is 6.2V applied to pin ⑩ of IN05

when cassette IN ?

Check connector PAN04 pin ① and ② and loading motor

in DECK Mechanism.

YES

Page 96

EE MODE Picture NG

Is video signal input into pin 42

(Video jack) and 45 of I501

Is 5V supplied at pin 10

and 9V supplied at pin 12 of I501

Is signal output from pin

43 of I501

Is signal input into pin 4 of I503

Is signal input into pin 38 of I501

Check PIF circuit and

LINE IN JACK

Check ON/OFF

9V circuit.

Check I501

Check Y/C PCB

Check pin 5 of I503

EE MODE : L, PLAY : High

Check Q706

and I503

Change I501

Check P504 and CRT PCB

Yes

4. VIDEO UNIT

Page 97

Power supply is normal

No video

Check clock, enable and

data of tuner

Check pin 35, 36, 37

of I701

Check

oscillation

at pin 24 of I701

Check Tuner

Is IF signal from tuner normal ?

Refer from EE mode

no video trouble shooting

flow chart

Yes

Page 98

PB video signal missing

Is envelope output from

IY03 pin 7 ?

Is 5V supplied at

IY03 pin 15 ?

Check power

circuit

Check IN01

pin 23

Clean head or

change head

Check Power

circuit

Check IN01

pin 36

Change IY01

Is 5V sup-

plied to pin

IY02 9, 12 ?

Change TR

Is CLOCK (3.58MHz)

Supplied at

IY01 pin 18 ?

Does XY01

crystal(3.58M

Hz) oscillate ?

Change XY01

(15PPM)

Change I503

Is SW pulse input into

IY03 pin 2 ?

Check IY01 pin

24, 27 5V ?

Check IY01 pin 4

EE mode : L, PB mode : H

Change QY01

Change IY01

Check QY09 and

QY07, QY08, QY10

Change IY01

Is signal output from

pin 3 of I503?

Check pattern

Is signal output from

IY01 pin 36 ?

Is signal input into

IY01 pin 35 ?

Check

QY05, QY04

Is color signal output from

IY01 pin 2 ?

Is signal input into pin 3 ?

Is composite video signal

out from IY01 pin 11 ?

Is composite video signal

input into IY01 pin 9 ?

Is composite video signal

output from IY01 pin 28 ?

Check I503 pin 5 PLAY : H, EE : L

Be all right

Yes

Low

Yes

High

Yes

Page 99

Self Record playback video signal NG

Check EP mode

Is REC(H) output from

PAY01 pin3?

Check QY06 and IN01 pin36

Is signal input into IY01

pin 31 ?

Check IY01

Check QY01 and side components

Check IY01

Check C. sync

Check IN01 pin 23

Is REC color signal

output from

IY01 pin 14 ?

Is luminance signal output

from IY01 pin 2 ?

Is luminance input

to IY01 pin3?

Is REC-Y(FM) signal output

from IY01 pin34?

Is C. sync : signal supplied

IY01 pin 3 ?

Is SW pulse input into

IY01 pin 2 ?

Is +5V supplied at

PAY02 pin7?

Check power circuit

Check video head

and connector

Yes

Page 100

5. AUDIO UNIT.

AUDIO SOUND IS NOT OUTPUT

AT EE(STOP) MODE

Check if there is output

at pin 4 of I501

Check if there is input at

pin 48 of I501

Check Z103, CC115,

CC116, L104

Check Q101

Base

TV : L

AV : H

Check if there is input at

pin 2 of I501

Check I501

Check if there is output at

pin 5 of I601

Check of 14V applied to

pin 6 of I601

Check power circuit

Check I601

sound output

Yes