DAEWOO TVZ 1321, TVZ 1341, TVZ 1341X Service Manual

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Service Manual

TV/VCR IN ONE BOARD

CHASSIS : CN-140

NTSC-M SYSTEM

MODEL : TVZ 1321

TVZ 1341 TVZ 1341X

DAEWOO ELECTRONICS CO., LTD.

SPECIFICATIONS

Format : VHS standard Playback System : 2 rotary heads(14F8N)

4 rotary heads(14F8N4), helical scanning system Luminance : FM azimuth

recording

Color Signal :Converted

sub-carrier phase shift

recording Video Signal System : NTSC-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

Power Source : 120V AC, 60Hz Power Consumption : 60W

Input Level : Video : VIDEO IN jack(RCA)

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

Video cassette

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 : 13Kg(SET) Dimensions : 379x400x381

Provided Accessories : Remote control unit Picture Tube : A34JLL40x01 Sound Output Power : 1W (80% Modulation)

SPEAKER

* Design and specification are subject to change without

notice. our legal obligations.

• Safety Check after Servicing

1kΩ

2kΩ

50kΩ

1.5kµF

1.5kΩ

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 specified values in order to verify compliance with safety standards.

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 specified clearance distance (d), (d") between soldered terminals, and between terminals and surrounding metallic parts. see table below.

Fig. 1

Table 1 : Rating for selected areas

AC Line Voltage Region

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

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

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

Insulation Dielectric Clearance

Resistance Strength Distance (d), (d')

≥6mm(d)

(z:Power cord)

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 an AC voltmeter to measure across both terminals of load Z. See figure and following table:

Fig. 2

Table 2 : Leakage current ratings for selected areas

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

i ≤ 0.7 mA peak

100 to 130 V South America

i ≤ 2mA dc

Antenna earth terminals

i ≤ 0.7 mA peak

200 to 250 V

i ≤ 2mA dc

Other terminals

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

locality.

IMPORTANT SERVICE NOTES

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 (minimum brightness) 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 service record. It is important to use an accurate and reliable high voltage meter.

2) This receiver is equipped with X-RADIATION PROTECTION circuit which prevents the receiver from producing an excessively high voltage even if the B+ voltage 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 PROTECTION 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.

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 metallic 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 measured 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.

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 the 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 shatter-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 current 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.

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 on the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts 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.

GENERAL ADJUSTMENT

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, perform purity and convergence adjustments. this should be all that is necessary to achieve optimum receiver 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 Antenna 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.

13” 24KV~26KV 20” 26KV~28KV

R410 is shorted.

7.WHITE BALANCE 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 appropriate BIAS VR to the counterclockwise until that line's color disappears.

6)Turn the SCREEN VR slowly again until another color is brightened and turn the appropriate BIAS VR to the counter-clockwise until that line's color disappears.

7)Turn the SCREEN VR slowly again until third color is brightened and turn the appropriate BIAS VR to the counterclockwise until that line's color disappears.

8)Adjust the BIAS VR to become white appropriate 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 disappear by pushing

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

12) Set CONTRAST to maximum and set brightness to

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

13) Inspect TRACKING for WHITE BALANCE by varying

CONTRAST and brightness. If tracking not correct, 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.

If a correct reading cannot be obtained, 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 PROTECTIONcircuit must be tested for proper operation as follows:

1)Operate the 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

LEADLESS(CHIP) INSTRUCTIONS

1.LEADLESS(CHIP) COMPONENT REMOVAL INSTRUCTIONS

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

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 recommended.

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).

Note :

a. Leadless components must not be reused after

removal.

b. Excessive mechanical stress and rubbing of the

components electrode must be avoided.

1-2. Removing the leadless component (Resistors,

Capacitors)

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

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.

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.

Note :

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

2.LEADLESS (CHIP) COMPONENT IDENTIFICATION

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

• 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

XXX

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

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

• Solder Bridges

Examples

123

470

= 12x103(1000) = 12000Ω

= 12KΩ

= 47x 10°(1) = 47Ω

CLEANING AND LUBRICATION OF DECK MECHANISM

Cleaning and Lubrication

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-GUIDE 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

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 provide a 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 on 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 GRAY SCALE ADJUSTMENT" on the CRT board.

10) Proceed with convergence adjustment.

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 superimpose 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 on the 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 hold 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 firmly 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

MECHANICAL DISASSEMBLY(DECK)

1.TOP VIEW

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

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 Bracket Total Ass'y

16.Cam Gear

17.AC Head Total Ass'y

18.T-Slant Pole Ass'y

MECHANICAL DISASSEMBLY(DECK)

1.TOP VIEW

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

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 Bracket Total Ass'y

16.Cam Gear

17.AC Head Total Ass'y

18.T-Slant Pole Ass'y

2.BOTTOM VIEW

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

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

3.F/L MECHANISM VIEW

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

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

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 Mechanism.

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

assembly.

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

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

Fig. 14- F/L Brkt Disassembly

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

Fig. 12- Front Loading Mechanism Removal

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

Fig. 15- Top Plate Disassembly

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. 13- Front loading mechanism disassembly

Fig. 16- Loading Lever Ass'y Disassembly

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)

Fig. 17- F/L Brkt R

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

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 ¤ and remove the loading rack (2).

3. Remove Right and left loading gears ¤Øand ¤Œ.

4. Remove the S and T slant poles ¤º and ¤ 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.

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 procedures in the "Mechanical Adjustment" section of this service publication.

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

Removal

L/C Bracket Assembly removal (Fig. 22)

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

NOTE :

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

Replacement of Pinch Lever Total Assembly Removal

1. Remove one (1) washer .

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

(Fig. 22)

Fig. 20- Loading Gears/Loading Rack Alignment

A/C Head Assembly Removal (Fig. 21)

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

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

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.

NOTE :

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

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

Fig. 23- L/C Bracket Assembly Alignment

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

1. Remove the cam gear form the deck mechanism.

2. Remove the relay lever from the main base .

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

NOTE :

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

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

Fig. 25- Main Plate Removal

Tension Band Assembly Removal (Fig. 26, 27)

1. Remove the tension spring from the main base (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.

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

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

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

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

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

Fig. 26- Tension Band Assembly Removal (1)

FE Head Removal (fig. 31)

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

Fig. 27- Tension Band Assem-

bly Removal (2)

Fig. 28- Tension Band Assem-

bly Alignment With Main Base

Capstan Motor Removal (Fig. 29)

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

Fig. 29-Capstan Motor Removal

Idler Plate/Reel Table Removal (fig. 30)

1. Remove one ¤ polywasher ¤ from the idler plate ¤Ł and remove the idler plate ¤Łfrom the main base.

2. Remove the reel tables ¤Øand the two ¤Ł polysliders ¤Œ from the deck mechanism.

Fig. 31- FE Head Removal

Reel Gear Total Ass'y and Connect Plate Removal

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

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

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

NOTE :

• When removing the connect plate 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. 32)

Fig. 30- Idler Plate/Reel Table Removal

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

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 pilot hole on the cam gear "A" is aligned with the hole "B" in the main base in the EJECT mode (fig. 1)

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

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. 2- Mechanical Checks/relay Lever and Cam Gear Alignment

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 align with each other in the EJECT mode (Fig. 3)

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

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

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 circular mark "D" on the Loading Gear R (fig. 5)

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

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 becomes 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, relocate the spring on the hook "A". If the value does not reach the specification, relocate 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 in 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.

TENSIOMETER PROBE

Fig. 6 - Back Tension Measurement/Adjustment

Operating the VCR Without a Cassette Tape

1. Remove the cassette Loading Mechanism.

2. By hand revolve the worm gear 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(by unplugging cord).

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 pilot hole on the tension lever coincides with that of the main base.

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

Fig. 7- Tension Pole Position Adjustment

MECHANICAL ADJUSTMENTS

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 has occurred or the tape path has changed, readjustment of the tape path is necessary.

ADJUSTMENT FLOW FOR THE TAPE TRANSPORTING SYSTEM

CLEANING

CHANGE

• DRUM TOTAL ASS'Y

• A/C HEAD ASS'Y

• PINCH LEVER TOTAL ASS'Y

CHANGE

• S-POLE BASE ASS'Y

• T-POLE BASE ASS'Y

•TENSION LEVER

ASS'Y

PATH ROUGH ADJ. S GUIDE ROLLER HEIGHT ADJ.

S GUIDE POST FLANGE

T GUIDE ROLLER HEIGHT ADJ.

A/C HEAD HEIGHT ADJ.

PATH PRE-ADJ.

LINEARITY ADJ.

PG(PHASE GENERATOR)

ENTRANCE ENVELOPE

EXIT ENVELOPE WAVEFORM

ENTRANCE & EXIT ENVELOPE

WAVEFORM FINE ADJ,

• X-POSITION ROUGH ADJ.

• ENTRANCE & EXIT ENVELOPE WAVEFORM FINE ADJ.

• REVIEW ¤APLAY

AUDIO ADJ.

X-POSITION ADJ.

TRACKING

Table. 8 Flow Chart of Tape Path Alignment

AUDIO TILT, HEIGHT

AZIMUTH ADJ.

SP, EP

THE SCHEMA TIC DIAGRAM OF TAPE TRANSPORTING SYSTEM

TENSION POLE S-GUIDE POST

FE HEAD

S-GUIDE ROLLER(P2) S-SLANT POLE DRUM T-SLANT POLE

T-GUIDE ROLLER(P3) A/C HEAD T-GUIDE POST CAPSTAN SHAFT PINCH ROLLER VERTICAL POST CORN SCREW

DESCRIPTION

1. TVZ1321/TVZ1341/TVZ1341X

1-1. FRONT OF TV/VCR

FRONT DOOR

1-2. SIDE OF TV/VCR

SPEAKER

1-3. REAR OF TV/VCR

VHF INPUT

VHF Input

Connect VHF antenna to this terminal.

*Rear of TV/VCR’s

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.

3. Remote control

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

TRACKING SLOW

SPEED

CLEAR

PAUSE/STILL

PLAY

VOL/V-LOCK CH/TRK

REW

VISS

1 2 3 4

5 6

7 8 9

11 12

13 14

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 bulletin 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.

13 ATK (Auto Tracking)

Press this button to Automatically set tracking point.

14 SLOW

Use this button to enable slow playback.

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

TRACKING SLOW

SPEED

CLEAR

PAUSE/STILL

PLAY

VOL/V-LOCK CH/TRK

REW

VISS

18 19

21 22

23 24

25 26

15 MUTE

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

16 RECALL

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

17 Number buttons (0-9)

Use these buttons to change channels or select menu items.

18 100

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

99.

19 SLEEP

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

20 CH/TRACKING

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

21 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.

22 CLEAR

Press this button to erase timer recording settings.

23 PLAY

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

24 FF (fast forward)

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

25 SPEED

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

26 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.

4. Remote controller (Service)

1 2

3 4

6 7

12 13

1 POWER

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

2 ATK (Auto tracking)

If the screen has noise and abnormal when playback

mode, Press this button to get fine playback Quality.

3 STOP (ENTER)

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.

4 PLAY

Press this button to begin normal playback of a tape, or

to move the cursor in the menu system.

5 REW (Rewind)

Use this button to rewind the tape or to change items in

the menu system.

6 MENU

Press this button to turn on the screen menu system on

and off.

7 CRT ON

Not used.

8 CH/TRACKING

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

9 STD

If you press this button, The TV/VCR become to manu-

facturer’s Mode.

10 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.

11 H/R

Press this button to set Heat-Run mode.

12 REC/B (Record Bias)

Use this button to adjust Record-Bias.

If you press this button,

The TV/VCR operates in Record-Mode in spite of having

no tape.

13 Mute

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

14 REC/OTR

Press this button to begin recording.

Press repeatedly to set a recording time using One-

Touch Recording(OTR).

16 17

19 20

21 22

23 24

27 28

15 TV/CATV

Use this button to set up your TV/VCR to receive signals

from an antenna(TV) or a cable system(CATV).

16 TV/LINE

Use this button to select between viewing the signal

coming from an antenna terminal(TV) or the signal

coming from the A/V Jacks(LINE).

17 FF (Fast Forward)

Use this button to “Fast Forward” a tape or to change

items in the menu system.

18 PAU./STILL

Press to temporarily stop the tape during recording or

playback, or to move the cursor in the menu system.

19 V/H

This is a one of the adjustment mode.

When press this button, only horizontal line is showed up

the screen.

20 S/TEST

Not used.

21 ATK OFF (Autotracking OFF)

Press this button to adjust x-path Adjustment and to con-

firm fine tracking.

Front Panel’s leds are lighted up if you press this button.

Use only adjustment tape.(DN-1:color bar)

After adjustment, Press this button repeatedly until leds

are off. and Press stop button twice.

After then, Insert tape and confirm fine tracking opera-

tion.

22 P/TEST (Picture Test)

Use this button to confirm screen’s condition.

(contrast, bright, tint, color, sharpness)

23 CLOCK

Use this button to test time operation. If you press this

button, the time go( 60)faster than normal mode.

24 D.P (Digital Preset)

Use this button to adjust screen menu.

(contrast, bright, tint, color, sharpness)

25 REC/T (Record Test)

Use this button to confirm self record-playback.

Operation

{Recording(SP:5sec, SLP:5sec) Zero stop(REW)}

26 RECALL

Press this button to display the current time, the counter,

channel number or other status items.

27 SLOW (only 4HD)

Press this button to begin slow playback.

28 SPEED (only 4HD)

Press this button to change slow playback speed.

ELECTRICAL ADJUSTMENTS

1. SERVO

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

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

X-path PLAY CONE SCREW PY09 Oscilloscope COLOR BAR

P2, P3 P2, P3 PY05

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis : S/DIV

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

Y/C BOARD

CH1

CH2

RN90

PY09

PY05

DECK AS

MAIN PCB

Adjustment Procedure

1. Preparation

1) Set the AUTO TRACKING to OFF using the Service REMOCON.

2) Play back the Test tape (DN-1: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. Adjustments

1) Adjust CONE SCREW to position to maximize the height of the ENVELOPE waveform.

2) Adjust P2 to position where the edge of ENVELOPE waveform are equal and symmetrical. Adjusting P3 is same to P2's.

3. Remarks

1) After adjusting, Press this button twice. (so leds are off.)

2) Insert the tape into deck to confirm Autotracking.

3) If the picture appears soon after the tape has been threaded around the drum, adjustments are probably correct.

However if autotracking is repeatedly, operating, the adjustments are incorrect.

4) Refer to the illustration on page 23 for the location of p2, p3 and the cone screw.

1-2) PLAYBACK PHASE Adjustment

Mode Adjustment parts Check point Test equipment Test tape Input signal

Play RN90 PY05 Oscilloscope COLOR BAR

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis : 50µS/DIV

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

PY09

RN90

DECK AS

PY05

Y/C BOARD

(t=412 sec 20 sec)

• Adjustment Procedure

1. Preparation

1) Play the Test tape (Color Bar).

2) Connect scope probe 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 falling edge of SW PULSE at 6.5H from the V-SYNC.

2. AUDIO

2-1) AUDIO CIRCUIT ADJUSTMENT METHOD

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

Audio

Record Bias

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis :

REC RU57 RC HEAD 10Ω Audio level meter Blank tape NONE

Vertical Axis :

PY09

DECK AS

MAIN PCB PARTS SIDE

PY05

RU57

RC HEAD

Y/C BOARD

• Adjustment Procedure

1. Preparation

1) Select REC mode using Service REMOCON. (then, front panel REC LED will be on.)

2) No signal is applied..

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 select rec mode by inserting a tape (with record tab removed) and push-

ing the rec button.

2-2) Audio Azimuth Adjustment

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

Audio Azimuth

Adjustment

Location of Adjustment Parts Observation Waveform

MAIN PCB Horizontal Axis : 0.1mS/DIV

P602

MAIN PCB PARTS SIDE

PLAY AC HEAD P602 Signal GEN. 7KHz

SCREW Oscilloscope MONO Bar

Vertical Axis : 0.1V/DIV

Y/C

PY09

DECK AS

PY05

RC HEAD

BOARD

• Adjustment Procedure

1. Preparation

1) Set the VCR to the PLAY mode

2) Connect scope to P602.

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

2. Adjustment Inspection standard : [Maximum Point]

3. VIDEO

3-1) Y NOISE REDUCTION

Mode Adjustment parts Check point Test equipment Test tape Input signal

EE RY 34 PY05, PY09 Oscilloscope Multi Burst

Signal gen. with 3.58 MHz

Location of Adjustment Parts Observation Waveform

Y/C PCB Horizontal Axis : 10µS/DIV

Vertical Axis : 20 mV/DIV

RY34

PY05

PY09

IY02 IY01

IY03

PAY02 PAY01

CH-2 (PY05YNR)

Horizontal:10µs/DIV Vertical:20mv/DIV

Y/C PCB SOLDER SIDE

• 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(PY09) and CH2 to the CNR TP(PY05) and trigger the scope with the signal from CH1.

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

3-2) COLOR NOISE REDUCTION

Mode Adjustment parts Check point Test equipment Test tape Input signal

EE RY 91 PY09 Signal gen. Color Bar

Oscilloscope

Location of Adjustment Parts Observation Waveform

Y/C PCB Horizontal Axis : 10µS/DIV

PY05

PY09

Vertical Axis : 50 mV/DIV

RY91

IY02 IY01

IY03

PAY02 PAY01

CH-2(PY09(NR)

Horizontal:10µs/DIV Vertical:50mv/DIV

Y/C PCB SOLDER SIDE

• Adjustment Procedure

1. Preparation

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

2) Supply 5V to PY05.

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 (PY05) and trigger the scope with the signal from CH1.

3) Adjust RY91 until Color signal becomes minimum.

SIGNAL FLOW

1. VIDEO & AUDIO

1-1. FROM RF TO COMPOSITE VIDEO

1-1. To select a channel the tuner must receive CLOCK, DATA and ENABLE from the TIMER IC (I701). Then the tuner(U101) selects a channel frequency by means of PLL circuit operation and outputs a IF signal(Intermediate Frequency). The signal from the tuner IF output is amplified by Q103, pre-amp. and then passes through the SAW filter. Now the IF signal is input to pins 8 and 9 of I501, where it is optimized by the VCO and AFT circuits. The composite video output at pin 51 of I501, contains the 4.5MHZ audio component. However the composite video signal at pin 45 of I501, does not contain the 4.5MHZ audio signal. Trap Z102 removes the audio signal. Pin 48 of I501, contains only the 4.5MHZ audio signal which is filtered by Z103. Pin 1 of switching IC 503 receives it, s signal directly from pin 43 of I501. The signal at this point is selected by an internal switch in I501. The signal source is either TV video at pin 45 or from pin 42 of I501. There are three video signals, tuner, external, A/V and PB. video. Switching IC 503 controls these signals.

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 input to pin 1 of I503. Another video signal from PLAY MODE is input 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 input to pin 22 of I701 to detect the CAPTION SIGNAL and it is also input 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 signals. TV Audio signal from pin 3 of I501 is input to pin 8 of I503. A/V audio signal from A/V JACK is input to pin 11 of I503 and outputted to pin 9, pin 10. So, that audio signal is input to pin 16 of IU01. Audio signal from PLAY MODE is input 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 output to pin 22 of IU01 and input to pin 1 of I501. Audio signal to be input pin 1 of I501 and controlled volume is output to pin 4 of I501. That audio signal is input to pin 3 of I601(SOUND AMP), and amplified by I601 and output to pin 5 of I601. Finally the audio signal goes to the SPEAKER.

SWITCHING TABLE OF I503

MODE RF

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 routed to the output port when the switching

port is at logic high state.

A/V PLAY TOGGLE

(Top View)

2. Power circuit (Power supply circuit)

2-1. Abstract and Pin Function

The SMPS(Switch Mode Power Supply) can supply a stable output voltage to each circuit, provided that the input voltage is within the range of between 108-132 VAC at 60HZ. Regulation is accomplished by PWM(Pulse Width Modulation) of IC STR-S5707. The table below identifies the various output volatges:

NO.SUPPLY ELECTRIC

RESOURCES

TRANS SECOND RECTIFIED

1 DC 125V VOLTAGE

DC 12V REGULATOR IC

(MOTOR 12V) I805(PQ12RF11) CAPSTAN MOTOR

SOURCE SUPPLY CIRCUIT APPLICATION

FBT

D814 selecting(33V)

PIF

FBT B

For channel

For driving DRUM,

SERVO circuit

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

I806 (KIA7809) H. VCC

DEFLECTION circuit

VERTICAL IC B

2-2. I801 STRS-5707

1) BLOCK DIAGRAM

SENS

R7 R8 R9

PNP

+2D

VIN

START UP

PRB RBG

T.S.D

OVP

LA TCH

OSC

PROPORTIONAL

DRIVE

OCP

INH

Trl

Tr2

DRIVD

SINK

GND

OCP

2) Function of Each Termiinal 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

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

3) Other Function

Symbol Function

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

Inhibit Terminal Off Time Synchronizing Latch Terminal Latch Circuit Operation Signal Input

4) Internal Circuit Constant

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

2-3. SMPS BASIC OPERATING DESCRIPTION

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

1) Power supply block circuit

2) Initial Operating Conditions – When AC voltage is applied at PWC1, the bridge rectifier converts the output voltage to DC and is filtered by C806.

– This voltage is applied to pin 9(V in term.) of I801, through R806 thus starting the operation of I801. – After C807 charges up to approx. 8V through series resistance R806, then the CTRL circuit starts operating. – The time constant created by R806 and C807 determines the time delay before the CTRL circuit operation begins

after the AC power is applied. Therefore if the value of C807 is high, it could delay the starting of I801 circuit. – CTRL circuit operation begins when drive(oscillation) at pin 3 of T801, forward biases D808 and charges C807. – When the voltage increases at pin 4 of T801, this forward biases D807 and charges C809. When the voltage across

C809 turns off the power to T810. – This results in the energy stored in the primary being induced into the secondary circuit.

3. DEFLECTION CIRCUIT

Vertical, horizontal drive pulses originate at M52335ASP(I501). The vertical drive pulses are connected to Vertical Drive IC TA8445K(I301) and drive vertical deflection coils. This horizontal deflection drive pulses drive the horizontal output circuits and deflection coils and also supply 26.5v, 180v, high voltage 25kV, focus voltage and screen voltage by driving the FBT.

u-COM CIRCUITS.

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

CHANNEL SELECTION AND MEMORY

User selects the channel, then the appropriate PLL data, clock and enable signals are sent out by the -com, to the tuner. The -com communicates with I702(IC24LC01B) to memorize, channel numbers, volume and video settings.

SERVO/SYSCON CIRCUIT OPERATION

1) Summary

•

When power is applied to the TV/VCR. The Servo-Syscon 1 chip confirms the operating mode of the deck mechanism, via the CAM SW. If the mechanism is not in it’s initial mode, the capstan motor will advance the mechanism to the proper position, depending if a tape is present or not. The deck is now ready to receive serial data from the timer IC.

• The Timer IC determines which function button has been pressed either on the unit or by the remote sensor.

Then the timer IC sends data to the Syscon IC to initiate the selected mode of operation.

•

When loading a tape, the L/C motor, capstan and drum motors are activated momentairly until the tape is threaded around the drum. This must occur before a normal screen will be observed.

• The drum servo system keeps the picture in sync both horizontally and vertically, by controlling the drum speed and phase. In PB mode the D-PG is compared against the reference signal, if required a error signal is sent to the D.PWM. This will correct for speed errors.

•

Capstan servo system controls, the speed and phase of the tape. This prevents distorted audio and eliminates noise bands on screen. In addition it helps prevent a lot of on screen noise caused by tracking problems. Capstan control is accomplished by comparing the CTL signal, measured from the lower section of the A/C head. The Syscon IC then computes the error signal which is then sent to the C-PWM.

2) VCR OPERATING MODES (1) EJECT : (2) STAND-BY : (3) STOP : (4) FF : (5) REW : (6) REC : (7) PAUSE : (8) PLAY : (9) STILL :

(10) CUE & REV :

MODE that a cassette ejects from the compartment. MODE that a cassette is unloading. MODE that a cassette is loading. Fast Forward MODE that moves the tape forward from the STOP mode REWind MODE that moves the tape reversely from the STOP mode RECord MODE that records video and audio signal on the tapes. record PAUSE MODE that makes recording stop. MODE that plays the record tape play STILL MODE that playback is paused MODE that allows a tape to be searched in the forward or reverse direction.

7. NORMAL AUDIO CIRCUIT OPERATION

1. REC Mode

The input is applied to pin 16 of IU01 and is amplified by the Line Amp., through the ALC circuit. One output at pin 22 connects to the speaker. The second output through the REC AMP., pin 21, connects to the R/P head and 70KHZ bias oscillator circuit.

2. PB Mode The audio signal from R/P head is input to pin 2 where it is amplified and equalized, then the signal is directed

by the #1, SW to the appropriate mode. In normal mode the audio signal is once again amplified by the Line Amp. and re-directed to the TV.

8. VIDEO CIRCUIT OPERATION

1. EE mode In EE mode video is applied to pin 31 of IY01 then it is output at pin 28. By the time the signal reaches the video out-

put terminal, it’s amplitude has increased 2X by the AGC and video amp.

2. REC mode

IY01

VIDEO OUT

IY03 LA7411

REC EQ R/T

814

PRE-AMP

IC 715 14

R/T

HA SW REC "H"

VIDEO IN

31 28

LA7423A

Y/C PROCESS IC

9111718

7.1M LPF

41 IY02 8 LC89960 IH CCD IC

•

Composite video enters, IY01 at pin 31 where both the chroma and FM luminance signals are down converted to lower frequencies. These signals then pass through the REC EQ circuit where they are processed for the correct REC characteristics.

•

The input signals at pins 7 and 8 of IY03 are processed by the AGC and REC CURRENT AMP., before they

are recorded onto the tape through the video head assembly.

2-1. REC mode(TVZ-1341 : 4HD)

• All signal flow is same to TVZ1321(2HD).

• But, the difference between TVZ1321(2HD) and TVZ1341(4HD) is EP(SLP) Recording.

• In case of 2HD, SP(H) & SP(L) heads are operated.

• In case of 4HD, EP(H) & EP(L) heads are operated.

3. PB mode

•

In the case of SP, the signals on pins #17, #20 of IY03(LA7411) are amplified to 60dB respectively and are output

to pin #7 IY03 and is routed to pin #4 IY01(LA7423A)

• The FM signal input to pin #14 of IY01 where it is at FM DEMODULATED after passing through FM EQ. within IC and then is routed to the Y/C MIXER after passing through 3.0MHz LPF.

• The FM signal at pin 14 of IY01 is passed through the 1.3MHz LPF to allow only the low frequency chroma signals

to pass through.

• The color signal is converted to 3.58MHz at Main CONVERTER and is routed to the Y/C MIXER after being ampli fied 6dB and then goes through ACC/BURST EMPHASIS. The Y/C signal is output at pin #28.

3-1. PB Mode ( TVZ1321 : 4HD)

•

All signal flow is same to

•

Pin number of LA7416 is differ from LA7411.

•

But special playback case, in example Que, Review, Still, Slow, Some signals are needed.

•

H.A switching and comp out and color Rotary.

•

In case of 2HD, only 2 heads are operated, But in case of 4HD, 4 heads are operated.

•

Above 3 signals are input and output through multiplexer IC(refer from TC4053BP).

•

Comp out is output from LA7416 pin 3.

•

This signal can switch SP and EP and detect large RF signal(Envelope).

•

Color Rotary signal is exclusive OR Logic function of H.A sw and comp out.

•

If these signals are correct, special playback function is normally operated.

TVZ1321

(2HD).

IMPORTANT IC'S OPERATION

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

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

4. Operating conditions at Ta = 25°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

5. Electrical Characteristics at Ta = 25°C

Parameter Symbol

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

Current dissipation I CCP The current flowing

L CH1 GVP 1 T17A T7A

Voltage gain

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

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

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

In- Out

-put -put

Conditions min typ max Unit

T1 T2

T4:OPEN (PB) SP MUTE

0141822mA

into pins 12

Vi = 38mVpp. f = 1MHz

output ratio

(4M component) Vi=38mVpp output ratio

56.5 59.5 62.5 dB

1.1 1.5

µVrms

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 harmonic is-30dB.

6. Pin Function Table

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

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

1 HA (EP/SP)

1.6V

EP SP

2 RF-SW

(REC-MUTE)

3 H-SYNC

4 REC-H PB O

5 ENV DET PB See attached

REC 5

OUT sheet

REC 0

SW30 REC MUTE

HCH

1.0V 3.2V OFF

LCH

Syac

1.5V

REC

2.0V PB

6 GND

2 2

7 PB-OUT PB 2.3

REC-C-IN REC 3.6

8 REC-Y-IN

REC 3.6

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

100

10k

20k

500

VCC

COMP

From REC ACC

COMP

16.7k

1.5k

3.3k

1.6k 10k

100

VCC

9 AGC-FLT

PB 0

10 REC-CUR

ADJ2

11 REC-CUR PB 4.5

REC 1.6

PB 2.5

REC 2.5

ADJI

REC 5.0

12 VCC

13 REC-BIAS

PB 0

4V : +3.5dB

2.5V : ±0dB (OPEN)

1V : -6dB

14 REC-OUT

16 PB Amp 19 2'nd Filt

REC 1.7

PB 0

REC 4.2

PB 2.0

REC 3.6

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

REC ON

VCC

PB ON

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

REC 0

18 PB-L-SW

PB 0

21 PB-H-SW

REC 4.2

15 23 NC 24

7. Pin Operation

VIDEO PREAMP IC LA7411

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

ON resistance 4 to 6Ω

IY03 (LA7416)

1. Application : 4HD VHS format VTR Record and Playback Head Amplifiers

2. Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit Maximum supply voltage VCC max 7.0 V Allowable power dissipation Pd max Ta 6.5°C 650 mW Operating temperature Topg -10 to +65 °C Storage temperature Tstg -40 to +150 °C

3. Operating conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit Recommended supply voltage VC 5.0 V Operating supply voltage range VCC opg 4.8 to 5.5 V

4. IC Logic Diagram

5. Pin Function Table

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

1 PB Amp PB 2.0 1 9 2’ nd Filt 2 2 2 8

REC 3.6

2 TRICK-H

3 COMP-OUT H : 4.5 or more

L : 0.7 or less

REC OPEN

4 HA (EP/SP)

Trick 1

3.0V NORMAL

1.0V

Trick 2

EP>SP ENV

: High

1.6V SP

5 RF-SW

(REC-MUTE)

6 H-SYNC

SW30 REC MUTE

HCH

1.0V LCH

1.5V

3.2V

OFF

Syac

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

7 REC-H PB 0.0

REC

2.0V

REC 5.0

8 ENV DET PB See attached

OUT sheet

REC 0.0

9 GND

10 PB-OUT PB 2.3

REC-C-IN REC 3.6

11 REC-Y-IN

REC 3.6

12 AGC-FLT PB 0

REC 1.6

13 REC-CUR PB 2.5

ADJ2

REC 2.5

14 REC-CUR PB 4.5

ADJ1

REC 5.0

4V : +3.5dB

2.5V : ±0dB (OPEN)

1V : -6dB

15 VCC

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

16 REC-BIAS PB 0

REC 1.7

17 REC-SP OUT 18 REC-EP OUT

20 SP-L-IN PB 0.7 23 SP-H-IN 27 EP-L-IN 30 EP-H-IN

21 SP-L-SW 24 SP-H-SW 26 EP-L-SW 29 EP-H-SW

PB 0

REC 4.2

REC 0

PB 0

REC 4.2

25 PRE-GND

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 circuit.

• 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

5.Pin Operation Y/C CCD IC LC89960

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

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

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

4. Pin Operation Y/C 1CHIP IC LA 7423

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

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

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

SYNC-DET

-OUT

1DC

S-DET-OUT

REC-Y REC = 2.4V

MAIN. DE.

EMPH-OUT

3 CLAMP

EMPH-OUT REC = 2.1V

R/P CTL PB = 4.4V

PB = 2.0V

REC = 3.0V

PB = 3.2V

REC = 2.1V

5 MAIN-EMPH

-FILT

6 NL FILT

PB = 4.4V

REC = 3V

PB = 3V

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

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

REC = 2.5V

13 NC-CTL

REC C-OUR REC =2.4V

PB-YC-IN PB = 3.2V

AGC-TC 1 REC = 2.4V

BALANCER PB = 2.3V

PB = 2.5V

under 1.5V N.C OFF

2.0~3.0V N.C CTL over 3.8V Y/CMix

OFF (N.C. Center)

Y-FM

+Low Chroma

REC-APC- REC = 2.3V

16 FILT

TRICK-H PB = over 3.5V

17 VXO-IN

18 XO-OUT

(SP Mode)

REC = 3.8V

PB = 3.8V

REC = 2.3V

PB = 2.4V

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

REC = 2.8V

19 SLD-FILT

PB = 2.8V

REC =2.8V

21 C-OUT

AFC/APC

FILT

PB = 2.8V

REC = 1.9V

XO mode

when over 3.5V

PB = 1.9V

CNR 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

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

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

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 integrated 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 characteristics of each mode. (4) PB AMP is low noise and high performance. (5) Built-in ALC circuit with variable ALC level 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)

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

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

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

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

4. Pin

AUDIO IC BA7790LS

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

5. Terminal Function Table

Terminal No. Description Function

1 HEAD EQ Switch for selecting the 0.0V 220kΩ/27Ω(ON)

head resonance capacitor

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

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

4 GND GND (for PB AMP, Head switch) 0.0V – 5 RIPPLE FILTER Ripple filter 9.0V 10kΩ(Vcc) 6 PB NFB PB AMP feedback 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)

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 –

Terminal

Voltage

Terminal Form

REC : 11Ω(ON)

REC : OPEN

Isink = 670µA

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.

IN05(BA6209)

1. Function : Reversible Motor Driver

2. Pin Operation

IN05 BA6209 LM DRIVE

CND

V.OUT1

VZ.1

V.REF

12345678910

CN10

0.0I

CCN11

0.01

DN13

ZPD 6.2

F.IN

51 50

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

IN01

IN03 (MC4558C)

1. Function : Dual wideband operational amplifier

2. Pin Operation

R.IN

RCN 22

3.3K

VCC1

RN21

VCC2

3.9 2W

VZ.2

CN35 100U

25V

V.OUT2

MOTOR 12V

To DECK

LM (+) LM (-)

DUAL OP AMP MC4558C

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

I503(TC4066BP)

1. Four independent circuits of bidirectional switches

2. Pin operation

SWITCHNG IC TC4066BP

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

I301(T A8445K)

RAMP GENERATOR

Vertical trig

INPUT

Drive Vcc

V. SIZE

1. Operating Conditions (Ta = 25°C)

Item Symbol Min Typ. Max. Unit

Drive vcc V

Vertical Drive Vertical Out

50/60Hz

S/W

RAMP

Pump up

V. NFB

GND

V. OUT

50/60 SW

Pump up Vcc

Pump up output

Phase compensation

1 8.1 9.0 9.9 V

Output Vcc

Pump up Vcc V Vertical Output Vcc I11P-

2 – 2.4 2.9 V

– – 2.2 Ap-p

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

Item Symbol

Drive current Icc1

Measurement

Condition

Min Typ. Max. Unit

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 Maximum peak to peak Voltage V5P-P 4 3.5 4.5 5.5 V 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

P-P

IN01 (Syscon : TMP91C642AN-3227)

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

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

PIN PIN NAME PIN DESCRIPTION

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, Sets “L” during SLOW mode

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

Sets 'L' during SLOW MODE 11 CAP F/R Switching forward(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 Switching 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

PIN PIN NAME PIN DESCRIPTION

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 CLOCK CRYSTAL (10MHz) 49 GND 50 LM(+)/LM(-) Loading motor forward(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

PIN PIN NAME PIN DESCRIPTION

54 CAM A CAM Detection input port 55 CAM B

CAM C

POWER A B C D MODE

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

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)

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

I701(Timer : M37267M6 - 103SP)

1. Pin Layout

M37267M6 - 103SP

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

COLOR PWM OUTPUT

PLL STROBE OUTPUT

SERIAL DATA OUTPUT

POWER FAIL OUTPUT

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

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.

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

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

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

2. Pin Description

PIN NO NO NAME DESCRIPTION 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 P44/INT1 POWER FAIL 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 Analog Vcc(+5V) –

19 HLF HLF R,C FILTER CONNECT TERMINAL

20 RVCO RVCO R CONNECT TERMINAL

21 V

HOLD

22 CV

23 CNV

V HOLD C CONNECT TERMINAL

CVIN Composite video INPUT TERMINAL I

GND ANALOG GND terminal –

PIN NO NO NAME DESCRIPTION 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

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

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

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

RESET

RESET CPU RESET INPUT TERMINAL I LOW

E2PROM DATA

MAIN CPU POWER TERMINAL (+5 CONNECT)

E2PROM DATA IN/OUT TERMINAL I/O

–

38 P12/SCL2 N. C. NOT CONNECTED I

39 P11/SCL1

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

E2PROM CLOCK

E2 PROM CLOCK OUTPUT TERMINAL O

PIN NO NO NAME DESCRIPTION 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

I501 (CHROMA IC : M52335SP - 600)

1. Pin Layout

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

52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27

SYNC

BLACK

VIDEO

CHROMA

AFT VCO

SEP

STRECH

TONE

AMP

VIDEO

CONT

NTSC

TINT

AMP

DET

Y DL

RAST

CHROMA

ACC/KILLER

1501

M52335SP

LOCK

DET

APC

BGP

BRIGHT

Y AMP

SEP

BLK

AMP

APC DET

DET

±45

AMP

LIM

Y SINC

AGC

SIF

AMP

VIF

AFC2

HCD VCO

ATT

DET

AMP

VIF

V/SIF

AFC

OSC

32fH

COINCIDENCE

DET

+9V

VCC

OSD

3 4 5 6

GND VCC+9V

7 8 9

10 11

VCC+9V

12 13 14 15 16 17 18 20 192

21 22 23 24 25 26

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

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 PINS

Pin No. wave Information

Function

Voltage and

EXT

1 AUDIO 3.25V

SOUND

2 DET 2.5V

COIL

Peripheral circuitry Circuit description

The Input impedance is 18kΩ. Add bias to the outside as shown right for use.

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

SOUND 3.75V

3 DET (Varies with

OUT coil position)

4 AF OUT 4.2V

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

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

Sound output pin through ATT.

DESCRIPTION OF PINS (cont.)

7.5k

1.5V

1.2k

320

3.4k

60p

14k

No. wave Information

Function

IF AGC

Voltage and

4.4 to 1.5V

FILTER

RF AGC

DELAY ADJ.

––––––

Peripheral circuitry Circuit description

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

IF AGC Voltage

4.4V

50dBµ

70dBµ

100dBµ IF Input

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

(YIF SIF)

GND-1

VIF IN 1.5V

Vcc-1

(VIF SIF)

11 APC FILTER 3V

––––––

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

11 pin

Output

fc frequency

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.

V11

IF frequency

DESCRIPTION OF PINS (cont.)

No. wave Information

Function

Voltage and

12 H. Vcc

13 AFC FILTER 6.25V

14 AFC FSP IN

FDP

Peripheral circuitry Circuit description

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

Increasing R provides a faster AFC response to minimize picture skew-

24k

6.25V

ing in the VCR mode. However this will increase horizontal jitter in weak signal areas

Flyback pulse is limited to 4V, to generate the AFC 2 detector pulse. Peaks around 4V caus-

es jitter;also the picture is displaced to the right

1.35k

due to the integration of the flyback pulse.

15 32H OSC 3.8V

X-RAY

PROTECT

CSB 500F18

1.2k

300300300

300

1.2k

CSB500F18 is used.

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

DESCRIPTION OF PINS (cont.)

33k

200

60k

30k

200

5.6k

10k

4.5V

Killer Service SW

640

3.8V

No. wave Information

Function

Voltage and

8V(Synchronous)

COINCIDEN-

CE OUT

0V(Asynchronous)

18 V.OUT

Peripheral circuitry Circuit description

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.

19 Vcc-2(VCJ) 9V

20 H.OUT

COLOR

CONT.

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.

4.5V

DESCRIPTION OF PINS (cont.)

200

10k

30k

10k

600 200

300

50k

Vth

2.5V

12k

4.5V

No. wave Information

Function

Voltage and

20 Y. OUT

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

Peripheral Circuitry Circuit description

Video output pin. The flyback pulse is required to trigger an internal blanking pulse, which also blanks chroma signal.

Open emitter output with maximum current of about 5mA.

26 OSD B 27 OSD G 28 OSD R

29 TINT CONT. 4.5V

Input impedance is 50kΩ. Input voltage must exceed 2.5V, to insert a character signal.

Tint control pin.

DESCRIPTION OF PINS (cont.)

300 300

M351T01

300

50k

Vth

2.5V

666 666

1.6k

22k

Vcc

No. wave Information

Function

Voltage and

30 FAST BLK IN

31 APC FILTER 6.5V

Peripheral circuitry Circuit description

Applying voltage of 2.5V or more causes blanking

Cap character is changed by R. As R is decreased, the cap character becomes narrower, but phase, jittering is reduced.

CHROMA

OSC

33 ACC FILTER

Use XTAL of the series capacitance type.

6.8V

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

1.15k 375 2k

1.5k 1.5k

1.7k 3.2k

4.7k

200

40k

20k

DESCRIPTION OF PINS (cont.)

670

100

40k

20k

33p

30p

4.5V

Pin No. wave Information

Function

Voltage and

BLACK

HOLD

About 3.2V

KILLER 7.6V

FILTER with signal input

Peripheral circuitry Circuit description

Pin used for holding the most dark parts of a video signal. The black peaks are averaged out by this circuitry. As R increases more of the blacks are held.

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

Normally 4.8V

36 CONTRAST Applied

GND-2

(VCD)

CHROMA IN/

BRIGHTNESS

externally

4.5V

Can be controlled by

5.1V center

Chroma signal standard. Chroma signal level is 200mVP-P. This pin is also used as a brightness control pin. DC reproduction ratio is 100%.

DESCRIPTION OF PINS (cont.)

1.4k

15k

1.5k

6.2k

4.5V

10k

1.4k

1.2k

1.07k

3.9k 1k

No. wave Information

Function

Voltage and

PEDESTAL

CLAMP

About 2.2V

VIDEO TONE

CONT.

4.5V

Peripheral circuitry Circuit description

Used to connect the hold capacitor.

Sharpness control pin. By increasing the voltage at this pin;the picture becomes softer.

41 Y IN 3.3V

EXT VIDEO

Video level at this pin is

0.5V P-P. Input level must be kept low to avoid, the pedestal clamp. Typical coupling capacitor of 0.1uF is used.

Video input level is 1Vp-p.

1.125k

7.35V

2.5V

40k

150

DESCRIPTION OF PINS (cont.)

850 850

Pin No. wave Information

Function

Voltage and

43 Y SW OUT 2.5V

44 SYNC IN. 6.6V

Peripheral circuitry Circuit description

Output signal level is

1.5Vp-p.

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

45 TV IN 2.5V

VCO COIL 4V

Signal level is 1V p-p

Reference tuning capacitance is 27pF. As the capacitance is decreased, the variable range becomes wider but stability becomes worse.

DESCRIPTION OF PINS (cont.)

10k

23.3k

4.5V

10k

2.4k

15k

29.3p

20p

7.5k

12.5k

32.5k

2.7k

250

No. wave Information

Function

Voltage and

48 SIF IN/ATT 4.5V

AFT

DEFEAT

Peripheral circuitry Circuit description

Volume control pin.

A voltage above 2.5V, defeats the AFT.

50 AFT OUT 8.2 to 0.5V

51 VIDEO OUT

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

The sync tip level is between 1.4V and

1.75V p-p

DESCRIPTION OF PINS (cont.)

0.4mA

Pin No. wave Information

Function

Voltage and

52 RF AGC OUT

Peripheral circuitry Circuit description

Max. current output is

0.4mA.

IN04(TC4053BP)

1. Function : Triple 2 Channel Analog Multiplexer/Demultiplexer.

2. Signal Input & Output Diagram

3. Operation Summary

This IC operates in case of Slow, Still, Que and Review in 4HD. To obtain exact signal waveform, various signals are input to each channel following are each controlled signal logics.

1) Que Ch1 : SW PULSE Ch2 : pin 15 * Logic AND function Ch3 : pin 9 CH3 = CH1 CH2

2) STILL Ch1 : SW PULSE Ch2 : pin 15 * Logic AND function Ch3 : pin 9 CH3 = CH1 CH2

3) Que Ch1 : SW PULSE

Ch2 : pin 15 * Logic OR function Ch3 : pin 11 CH3 = CH1 CH2

4) Que Ch1 : SW PULSE

Ch2 : comp SP SLP * Logic AND function Ch3 : C Rotary CH3 = CH1 CH2

IMPORTANT SIGNAL WAVEFORMS

IY01 PIN 14 (PB ENVELOPE)

500mVp-p 34mS

IY01 PIN 2 (PLAY)

500mVp-p 63.5 S

IN03 PIN 1(CTL HEAD +)

2.5Vp-p 34mS

IN01 PIN 20 (CTL PULSE)

5.2Vp-p 34mS

I501 PIN 38

2.5Vp-p 63.5 S

IY01 PIN 2 (REC)

500mVp-p 63.5 S

I501 PIN 43 & IY01 PIN 31 VIDEO

2.2Vp-p 63.5 S

IY01 PIN 28 VIDEO OUT (PLAY)

2.2Vp-p 63.5 S

IY01 PIN 26 (C SYNC)

3.6Vp-p 63.5 S

PH502 PIN 2 (HEATER PULSE)

24Vp-p 63.5 S

P504 PIN 4 (-Y)

34Vp-p 63.5 S

AUDIO WAVEFORMS.

(IU01-3) REC

50Vp-p 14.5 S

(IU01-21) REC

1.1Vp-p 10 S

(IU01-10) PLAY

1.5Vp-p 10 S

(IU01-22) REC

1.5Vp-p 10 S

(IU01-12) PLAY

0.5Vp-p 10 S

(IU01-23) REC (SP Mode)

150mVp-p 10 S

(IU01-16) REC

150mVp-p 10 S

(LU06-7) REC

25Vp-p 14.5 S

TROUBLESHOOTING ACCORDING TO CAUSE AND SYMPT OM

1. POWER SUPPLY UNIT

2. VERTICAL, HORIZONTAL UNIT

3. SERVO/SYSCON UNIT

4. VIDEO UNIT

5. AUDIO UNIT – Before Troubleshooting, Read the following.

• Picture will not appear, if the following problems exist.:

1) When power supply is dead.

2) When horizontal output TR is dead

3) When operation of overcurrent protection circuit.

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

• Suggestions when servicing the power supply unit.

1) Before changing components, unplug the power cord. Then discharge both terminals of C806, through a high wattage resistor measuring in the k ohm region.

2) When servicing this unit, it is recommended that an isolation transformer be used. This will protect personnel and

test equipment from a potential shock hazard.

3) Whenever the fuse blows, measure the resistance of the cement type power resistors.

4) Check solder connections on components mounted on heat sinks and other parts after completing services.

1. Power supply unit

TV will not turn ON

Yes

Is there AC power Input

Yes

Are diodes ok?

D802, D803, D804, D805

Yes

Is there voltage at the +termi-

nal of C806?

Yes

Are D811, D812, D813, D814

ok?

Yes

Are I804, I805,I806

ok?

Yes

Is the Voltage at pin 40

of I701 "L" ?

Check F801 & Power cord

Check L801, D802, D803,

D804, D805

Check R803, C806

Check D811, D812, D813,

D814

Check each Regulator IC

I804, I805, I806

Check I701

Yes

Check P803 pin 2 125V

Yes

Is waveform of base

of Q301 normal?

Yes

Is feedback Voltage of T801 TRANS normal ?

Yes

Above Circuits ok

Check D814 and trans

Check I701 1, 2

Check I801 STRS-5707

Check the

secondary

circuit

– Check 125V unit(Deflection PCB)

Is the over current protection

circuit activated ?

Yes

Are voltages at the base &

collector terminals of Q402

normal ?

Yes

Is the 26.5V output from FBT

normal?

Yes

Is the 180V output from FBT

normal?

Yes

Check R832, R809

Check T401 and Q402

Check R301 and D301

Yes

Check I301

Check R403 and D401

Change

R301 and

D301

Change

R403 D401

Is FBT correct ?

Yes

Check CRT PCB

Check FBT

2. VERTICAL, HORIZONTAL UNIT .

Horizontal Line only on the

screen.

Yes

Is there 25V and 9V

at pin 7 and pin 1 of I301 ?

Yes

Is waveform at pin 2 of I301

normal ?

Yes

Check the waveform at pin

5 of I301

Yes

(No Vertical)

Check power circuit

Check I701 pin 2

Check C312

Check the waveform at pin

11 of I301

Yes

Check DY connections

Yes

Above circuits ok

Check I 301

Resolder

Horizontal screen is abnormal

Yes

Is the collector waveform of

Q402 normal ?

Yes

Check the capacitance of C412 and

solder connection

Yes

Check R406, C413, L402, C409, D404,

R407.

Yes

Is base waveform of

Q401 normal ?

Check T401

and L401

NoYes

Check T402

pin 10

Above circuits ok

3. SERVO/SYSCON UNIT

Playback picture is not good.

Yes

Noise appears although

adjusting tracking

Yes

Noise streaks moving up and

down on the screen.

Yes

Is there CTL pulses at

pin 7 of IN03 ?

Yes

Is there CTL pulses at

pin 20 of IN01 ?

Yes

Adjust tracking

Noise appears although

changed the cassette tape.

Check PY 03

and CTL Amp

circuit IN03

Yes

Check and

readjust the

tape path on the

Deck

Check IN 01

Playback picture

is not good.

Yes

Noise appears over

the entire screen

Yes

Are SW pulses

applied to

PRE-AMP circuit ?

Yes

Is the Enve. waveform

supplied to pin 3

of PY 09

Yes

Check VIDEO circuit.

The entire screen scrolls up and down

Yes

Check P.G Adjustment

Is the SW pulse supplied

from pin 23 of IN01

Yes

Check pattern

Check connector, Head

Amp and Clean heads.

Check D. PG

input IN01 pin

18 and connector

(PY04)

Instrument goes to

auto stop during

playback

Are Reel pulses applied

to pin 14 of IN01

Yes

Check REEL

sensor part.

Is D. FG applied to

pin 17 of IN01

Yes

Check IN01

Check connector

PY03

DAEWOO TVZ 1321, TVZ 1341, TVZ 1341X Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual