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

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.

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