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TV+DVD service manual / Схема, сервісна інструкція відеодвійки

ROADSTAR TV+DVD service manual / Схема, сервісна інструкція відеодвійки Service manual & schematics

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Page 1

TLV-1491XK

Page 2

IN CASE OF NEED TO CONVERT A SERVICE ADJUSTMENT

  • When replace a EEPROM(IC43).
  • When replace a C.R.T

HOW TO ENTER INTO SERVICE MODE ADJUSTMENT.

  • At STAND-BY mode, operate the remote control transmiter(RMCN) in following order.
  • Convert a SERVICE mode.

  • To be display as follows on picture.
  • Service mode ON-SCREEN
  • The on-screen display color is changed of RED.
BUS CC NTROL · ··· .
1. SUB ADJUST
2. H-V ADJUST
3. W-B ADJUST
4. BIT ADJUST

  • Select a adjustment item by "Cursor Left/Right" key or direct channel key.
  • After select a sub adjustment item by "Cursor Left/Right" key or direct channel key, adjust by "VOL UP/DOWN" key. and them the TV set will be memorized, if you reset.
  • Follows MICOM early measurement is not a factory work condition. It is a showing of initial value of DATA, when replace a IC23
  • 1. SUB ADJUST
INITIAL VALUE VARIABLE RANGE
1 SUB COLOR 7 00 ~ 21
2 SUB BRIGHT 10 00 ~ 21
3 SUB CONTRAST 10 00 ~ 21
4 SUB TINT 10 00 ~ 21
5 SUB SHARP 02 00 ~ 31
6 AGC ADJUST 10 00 ~ 63
2. H-V ADJUST(*: Marking is not ADJUST )
INITIAL VARIABLE INITIAL VARIABLE
VALUE RANGE VALUE RANGE
1.H-SHIFT 34 00 ~ 63 6.V-SLOPE 32 00 ~ 63
2.V-SIZE 20 00 ~ 63 7.V-SHIFT 37 00 ~ 63
*3.H-S1ZE 32 00 ~ 63 *8.H-PIN 32 00 ~ 63
*4.COR-PIN 32 00 ~ 63 *9.H-TARP 32 00 ~ 63
5.V-SCR 07 00 ~ 63 *10.V-ZOOM 32 00 ~ 63
Page 3

SERVICE MODE ADJUSTMENT

3. W-B ADJUST

SECTION INITIAL VALUE VARIABLE RANGE
1 R 32 00 ~ 63
2 G 32 00 ~ 63
3 B 32 00 ~ 63

4. BIT ADJUST

SECTION INITIAL VARIABLE SECTION INITIAL VARIABLE
VALUE RANGE VALUE RANGE
1 IN 0 0~1 26 AF 0 0~1
2 BC 0 0~1 27 IS 0 0~1
3 FO 0 0~1 28 MO 0 0~1
4 XA 3 0 ~ 3 29 VW 0 0~1
5 FR 3 0 ~ 3 30 SM 0 0~1
6 DL 0 0~1 31 FA 0 0~1
7 .ST 1 0~1 32 IF 2 0~6
8 P0 0 0~1 33 OSO 1 0~1
9 CM2 0 0 ~ 7 34 VSD 0 0~1
10 AVL 0 0 ~ 1 35 CB 0 0~1
11 AKB 0 0~1 36 BLS 0 0~1
12 VTM 1 0~1 37 BKS 1 0~1
13 GAI 0 0~1 38 BB 0 0~1
14 NC1 0 0~1 39 HOB 0 0~1
15 STM 0 0~1 40 BPS 0 0~1
16 VID 0 0~1 41 ACL 1 0~1
17 LBM 0 0 ~ 1 42 CMB 0 0~1
18 HCO 1 0~1 43 AST 0 0~1
19 EVG 0 0~1 44 CL2 3 0 ~ 7
20 SBL 0 0~1 45 YD3 0 0 ~ F
21 PRD 1 0~1 46 DS 1 0~1
22 MAT 0 0~1 47 DSA 0 0~1
23 RBL 0 0~1 48 FFI 0 0~1
24 COR 0 0~1 49 EBS 0 0~1
25 IE 1 0~1 50 FCO 0 0 ~ 1
Page 4
ALLATTON AND SERVICE ADJUSTMENT
GENERAL

In the majority of case, a color television receiver will need only slight touch-up adjustment upon installation, check the basic characteristics such as height, vertical sync, horizontal sync, and focus.

HOW TO OPERATESERVICE ADJUSTMENT

  • At STAND-BY mode, operate the remote control transmiter(RMCN) in following order.
  • Convert a SERVICE mode.

• To be display as follows on picture.

SUB-ADJUSTMENT

• How to adjust sub-mode : select sub-adjust mode at bus control

BUS O ONTROL
1. SUB ADJUST
2. H-V ADJUST
3. ₩-B ADIUST
4. BIT ADJUST

  • In above list, sellect your wanting item by press corresponding number in TEN(10) key.
  • The following are the contents of each mode, if you select any mode.
  • After a mode selected, adjust it's value in detaks with " VOL UP/DOWN" key to be best you want.
  • And adjusted value should be memorized to IC43 by POWER-OFF key on RMCN.
  • # NOTE : When the EEPROM is replaced, intial value shown ON-SCREEN is original data of MICOM ifself so necessary do again setting of best adjustment condition as above order.
Each adjustment mode and variable range at t sub-adjust mode
~~~~
INITIAL VALUE VARIABLE RANGE
1 SUB COLOR 7 00 ~ 21
2 SUB BRIGHT 10 00 ~ 21
3 SUB CONTRAST 10 00 ~ 21
4 SUB TINT 17 00 ~ 21
5 SUB SHARP 02 00 ~ 31
6 AGC ADJUST 10 00 ~ 63
Page 5

1-2 WIRE DIAGRAM

1-2-1) WIRE DIAGRAM

Page 6

2. ASSEMBLY DIAGRAM & MAJOR PARTS CHECK

2-1. ASSEMBLING DIAGRAM

2-1-1) ASSEMBLING DIAGRAM OF DECK ASS'Y

A. TOP VIEW

  • 1. EARTH BRKT ASS'Y
  • 2. FE HEAD
  • 3. S SLANT POLE ASS'Y
  • 4. TENSION BAND 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 LEVERL
  • 13. CAPSTAN MOTOR
  • 14. PINCH LEVER TOTAL ASS'Y
  • 15. L/C BRKT TOTAL ASS'Y
  • 16. CAM GEAR
  • 17. A/C HEAD TOTAL ASS'Y
  • 18. T SLANT POLE ASS'Y
  • 19. DRUM TOTAL ASS'Y
  • 20. RECORD SAFETY LEVER
Page 7

1. CAPSTAN MOTOR

2. F/L RACK

  • 3. CONNECT PLATE
  • 4. REEL BELT
  • 5. REEL GEAR TOTAL ASS'Y

6. RECORD SAFETY LEVER 7. L LOADING ASS'Y 8. R LOADING ASS'Y 9. DRUM TOTAL ASS'Y 10. LOADING RACK ASS'Y

Page 8
2-1-2) PARTS LOCATION OF FRONT LOADING ASS'Y
A. TOP VIEW

B. FRONT VIEW

Page 9

2-2. PERIODIC MAINTENANCE AND SERVICE SCHEDULE

2-2-1) PERIODIC MAINTENANCE AND SERVICE SCHEDULE

  • A. In order to effectively maintain the excellent performance and fully utilize the features of this apparatus, and to lengthen the life of the mechanism and tapes, we strongly urge you to perform periodic maintenance and inspection, as described below.
  • * After repairing, do the maintenance described below, irrespective of the length of time in use.
  • B. Cleaning of the Head Drum Ass'y
    • Clean the Drum assembly with a cleaning cloth soaked in liquid cleaner (alcohol) by placing lightly against the Drum and slowly revolving the rotating HEAD DRUM Ass'y by hand (Do not rotate the upper Drum by applying electric power to the motor when cleaning).
    • Do not move the cleaning cloth in the vertical direction against the heat-tip.
  • C. Cleaning the tape transporting section.
    • Clean the tape transporting parts with a cleaning cloth soaked in alcohol.
  • D. Cleaning of driving section
    • ---- Clean the driving section with a cloth soaked in alcohol.
  • E. Routine inspection

- Perform maintenance and inspection as separately described depending on the period of time in use.

- Refer to the table of 2-2-3.

2-2-2) CLEANING AND LUBRICATION

  • A. Cleaning of Tape Transporting section and Driving section
  • a. Cleaning of Tape Transporting section
  • ---- The following parts should be cleaned after every 500 hours of use.
    • TENSION POLE S SLANT POLE AC HEAD/AE HEAD
    • S GUIDE POST
  • VIDEO HEAD/DRUM
  • T GUIDE POST

  • FE HEAD
  • T SLANT POLE
  • CAPSTAN SHAFT PINCH BOLLER
  • S GUIDE ROLLER T GUIDE ROLLER VERTICAL POST
  • As the above parts contact with the video tape, they tend to collect dust particles. If they are stained with dust or foreign substance it has a bad effect on the picture and may lead to damage of the tape.
  • After cleaning with alcohol, allow the parts to dry thoroughly before using a cassette tape.
  • b. Cleaning of Driving section
    • REEL TABLE CAPSTAN FLYWHEEL/PULLEY REEL PULLEY
  • B. LUBRICATION
    • S REEL POST T REEL TABLE POST REEL GEAR POST
  • After cleaning these parts with alcohol, lubricate these with one or two drops of oil.
Page 10

2-2-3) SERVICE SCHEDULE FOR THE MAJOR PARTS

The following parts should receive periodic service, according to the recommended intervals.

NAME - PERK DDIC SERVIC E (TIME)
1000 2000 3000 4000 5000
DRUM TOTAL ASS'Y * O * *
CAPSTAN MOTOR O 0
L/C BRKT TOTAL ASS'Y O O
REEL BELT O O
IDLER PLATE TOTAL ASS'Y O 0
REEL TABLE
T SUB BRAKE ASS'Y O O
TENSION BAND ASS'Y O O
S MAIN BRAKE ASS'Y O 0 •
T MAIN BRAKE ASS'Y Ø O
PINCH ROLLER ASS'Y * Ó *
AC HEAD ASS'Y · O -
FE HEAD Ō
REEL GEAR TOTAL ASS'Y ·. O O

★ : Check and Replace if necessary. ◎ : Replace

Note:

Even though the unit is not used frequently, cleaning, lubrication and replacement of the belt should be undertaken every 2 years.

Page 11

2-3. JIGS AND TOOLS

2-3-1) LIST OF JIGS AND TOOLS
NO ITEMS MODEL FIG.
N O 		REMARKS
1 ALIGNMENT TAPE NTSC: SP MONOSCOPE 7KHz
SP COLOR BAR 1KHz
(EP MONOSCOPE) 		0 CHECKING OF THE
TAPE TRANSPORTING
SYSTEM
2 CLEANING TAPE
(DAEWOO) 		DHC-602V 2 CHECKING OF THE TAPE
TRANSPORTING SYSTEM
3 CASSETTE TAPE
(KOKUSAI) 		KT-300NV
KT-300RV 		3 MEASUREMENT OF
REEL TORQUE
4 VHS SPINDLE
HEIGHT GAUGE 		TSH-V4 4 MEASUREMENT OF
REEL HEIGHT
5 TENTELO METER
(TENTELO) 		T2-H7-UM 5 MEASUREMENT OF
THE BACK TENSION
6 FAN TYPE
TENSION METER 		BELOW 3KG 6 MEASUREMENT OF THE
PRESSING FORCE FOR
THE PINCH ROLLER
7 DENTAL MIRROR 1 CHECKING OF THE TAPE
TRANSPORTING SYSTEM
+DRIVER 8-1
8 HEX DRIVER 8-2
ADJUSTMENT DR IVER 8-3 ′
Page 12

3-2. DISASSEMBLY OF THE FRONT LOADING ASS'Y (See Fig. 3-2~3-6)

  • a. Remove one 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 CASSETTE HOLDER ASSEMBLY.
  • b. Remove the CASSETTE HOLDER ASSEMBLY. (Fig. 3-2)

FIg.3-2 DISASSEMBLY OF THE FRONT LOADING ASS'Y

c. Remove one screw holding the PRISM LINK R and remove the PRISM LINK R from the F/L BRACKET R. (Fig. 3-3)

FIg.3-3 DISASSEMBLY OF THE F/L BRKT R

Page 13
d. Remove one screw holding the PRISM LINK L. (Fig. 3-4)

e. Release the hook B by pushing it in the direction of the arrow and remove the DOOR OPENER. (Fig. 3-4)

Fig. 3-4 DISASSEMBLY OF THE TOP PLATE

f. Remove the LOADING LEVER ASSEMBLY by pressing the connected section of the loading lever assembly in the directions of the arrows. (Fig. 3-5)

g. Remove the SAFETY SPRING between the SAFETY LEVER and the CASSETTE HOLDER PLATE. (Fig. 3-5)

h. Remove the RELEASE SPRING between the RELEASE LEVER and the SAFETY LEVER R. (Fig. 3-5)

Fig.3-5 DISASSEMBLY OF THE CASSETTE HOLDER ASS'Y

Page 14

NOTE:

Reassemble the FRONT LOADING MECHANISM in the reverse order. Confirm that the two bosses on the left side of the CASSETTE HOLDER AS are inserted into the groove on the left side of the top plate. Insert the two bosses on the right side of the cassette holder into the groove of the F/L BRAKCET R (Fig. 3-6)

FIg.3-6 ASSEMBLY OF THE F/L ASS'Y

3-3. DRUM ASS'Y/EARTH BRACKET ASS'Y REMOVAL (See Fig.3-7)

  • a. Remove three screws () fixing the DRUM TOTAL ASSEMBLY.
  • b. Remove the EARTH BRACKET ASSEMBLY (2). c. Carefully lift the DRUM TOTAL ASSEMBLY (3)
  • from the DECK MECHANISM, taking care not to damage or touch the VIDEO HEAD.
NOTE:

  • After assembling the DRUM TOTAL ASSEMBLY, confirm that the TAPE runs smooth and refer to chapter 5 "ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM".
  • When assembling the EARTH BRACKET ASSEMBLY, a 3x12 screw should be used and at the other parts, 3x10 screws should be used.

FIg.3-7 DRUM TOTAL ASS'Y & EARTH BRKT ASS'Y REMOVAL

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3-4. REEL BELT, LOADING RACK ASS'Y, LOADING ASS'Y, S/T SLANT POLE ASS'Y REMOVAL (See Fig.3-8)

  • a. Turn over the DECK MECHANISM and remove the REEL BELT ().
  • b. Remove one POLY WASHER (2).
  • c. Remove the LOADING RACK ASS'Y (3).
  • d. Remove R & L LOADING ASS'YS (4) and (5).
  • e. Remove the S and T SLANT POLES (6) and (7) by pulling them in the directions of the arrows.
CAUTION:

  • Take care not to get the GUIDE ROLLERS of the S/T SLANT POLES stained with GREASE
  • When reassembling, refer to Fig. 3-9

FIg.3-8 REEL BELT, LOADING RACK ASS'Y, R & L LOADING ASS'YS, S/T SLANT POLE ASS'Y REMOVAL

FIg.3-9 ASSEMBLY OF the R.L LOADING ASS'Y & LOADING RACK ASS'Y

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3-5. A/C HEAD ASS'Y REMOVAL (See Fig.3-10)

  • a. Remove one nut hex () from the A/C HEAD POST () of the MAINBASE.
  • b. Remove the A/C HEAD ASSEMBLY (2) from the MAINBASE.
  • c. Remove the A/C HEAD SPRING ③ from the A/C HEAD ASSEMBLY ②.
NOTE:

  • After reassembling, adjust the TAPE TRANSPORTING SYSTEM refering to chapter 5 "ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM".
  • After adjusting the TAPE TRANSPORTING SYSTEM, spread the A/C HEAD/NUT, AZIMUTH SCREW, and TILT SCREW with LOCKING PAINT.

Fig.3-10 DISASSEMBLY OF THE AC HEAD ASS'Y

3-6. L/C BRACKET ASS'Y REMOVAL (See Fig.3-11)

  • a. Remove one screw () from the L/C BRACKET ASSEMBLY (2).
  • b. Remove the L/C BRACKET ASSEMBLY (2) from the MAINBASE.
3-7. PINCH LEVER TOTAL ASS'Y REMOVAL (See Fig.3-11)

  • a. Remove one POLY WASHER ③ from the PINCH LEVER POST of the MAINBASE.
  • b. Unhook the PINCH LEVER SPRING (4) from the hook of MAINBASE (5) and remove the PINCH LEVER TOTAL ASSEMBLY (9).
CAUTION:

Take care not to coat GREASE, OIL or other substances on the surface of the PINCH ROLLER (D).

Flg.3-11 L/C BRKT, PINCH LEVER, CAM GEAR, RELAY LEVER, F/L RACK REMOVAL

Page 17

3-8. CAM GEAR, RELAY LEVER AND F/L RACK REMOVAL (See Fig.3-11)

a. Remove the CAM GEAR ⑦ from the MAINBASE. (Fig.3-11)

  • b. Remove the RELAY LEVER (6) from the MAINBASE. (Fig. 3-11)
  • c. Remove the F/L RACK (8) from the MAINBASE by pulling it in the direction of the arrow.

NOTE : When reassembling, refer to Fig. 3-12, 13.

Fig.3-12 ASSEMBLY OF THE CAM GEAR & RELAY LEVER

3-9. S/T MAIN & SUB BRAKE ASS'Y REMOVAL (See Fig.3-14)

  • a. Unhook the MAIN BRAKE SPRING () from the T MAIN BRAKE LEVER (3) and remove the T MAIN BRAKE ASSEMBLY (3).
  • b. Remove the S MAIN BRAKE ASSEMBLY (2) from the MAINBASE (8).
  • c. Unhook the S SUB BRAKE SPRING (4) from the MAINBASE and remove the S SUB BRAKE LEVER ASSEMBLY (5) from the MAIN BASE (8).
  • d. Unhook the T SUB BRAKE SPRING (6) from the MAINBASE and remove the T SUB BRAKE LEVER ASSEMBLY (7).

Flg.3-14 S/T MAIN & SUB BRAKES REMOVAL

Page 18

3-10. TENSION BAND ASS'Y REMOVAL (See Fig.3-15, 3-16)

a. Remove the TENSION SPRING (2) from the MAINBASE (1). (Fig.3-15)

b. Turn the DECK MECHANISM over. (Fig.3-16)

c. After separating the tab of hook 'A', remove the TENSION BAND ASSEMBLY (3). (Fig.3-16)

NOTE:

  • After assembling the TENSION BAND ASSEMBLY on the MAINBASE, adjust the position of TENSION POLE as shown Fig. 3-17.
  • Avoid getting GREASE, OIL or foreign substance on the FELT of the BAND BRAKE.
  • Take care not to deform tab 'A' when separating it .

FIg.3-15 TENSION BAND ASS'Y REMOVAL (I) FIg.3-16 TENSION BAND ASS'Y REMOVAL (I)

FIg.3-17 ADJUSTMENT OF THE TENSION POLE POSITION

Page 19

3-11. CAPSTAN MOTOR REMOVAL (See Fig.3-18)

Remove 3 screws fixing the CAPSTAN MOTOR and separate the CAPSTAN MOTOR.

FIg.3-18 CAPSTAN MOTOR REMOVAL

3-12. IDLER PLATE TOTAL ASS'Y & S/T REEL TABLE REMOVAL (See Fig.3-19)

  • a. Remove one POLY WASHER () from the REEL GEAR POST (2) and remove the IDLER PLATE TOTAL ASSEMBLY (3) from the MAIN BASE.
  • b. Remove the S/T REEL TABLES ④ and two POLY SLIDERS ⑤ from the DECK MECHANISM.
CAUTION:

When disassembling or assembling the IDLER PLATE TOTAL ASSEMBLY, take care not to bend it.

Fig.3-19 IDLER PLATE TOTAL ASS'Y & S/T REEL TABLES REMOVAL

Page 20

3-13. FE HEAD REMOVAL (See Fig.3-20)

Remove one screw () fixing the FE HEAD and remove the FE HEAD (2) from the MAINBASE.

FIg.3-20 FE HEAD REMOVAL

3-14. REEL GEAR TOTAL ASS'Y & CONNECT PLATE REMOVAL (Fig.3-21)

  • a. Turn over the DECK MECHANISM and remove one POLY WASHER () from the REEL GEAR POST (2).
  • b. After separating tab 'B' of the MAINBASE, remove the REEL GEAR TOTAL ASSEMBLY (3) from the MAINBASE.
  • c. Remove the CONNECT PLATE ④ from the MAINBASE by pushing it in the direction of the arrow.

Flg.3-21 REEL GEAR TOTAL ASS'Y & CONNECT PLATE REMOVAL

NOTE:

  • When removing the CONNECT PLATE with the F/L RACK installed, take care not to damage or bend the CONNECT PLATE.
  • After assembling or disassembling the REEL GEAR TOTAL ASSEMBLY, take care not to get OIL, GREASE or other substances on the REEL BELT.
  • Take care not to deform or break tab "B".
  • Check the assembly state & the operating state of the REEL GEAR TOTAL ASSEMBLY befor assembling.
  • After reassembling, check the FF, REW, PLAY and REVIEW MODES and the existence of noise when operating the MODES.
Page 21

4. MECHANICAL ADJUSTMENT

4-1. MECHANICAL ADJUSTMENT (See Fig.4-1--4-5)

When operational problems occur or the mechanism is reassembled, be sure to confirm the following INSTRUCTIONS.

a. Make sure that the DATUM HOLE of the CAM GEAR is aligned with the DATUM HOLE in the MAINBASE in the EJECT mode, as shown in Fig.4-1.

FIg.4-1 DATUM POSITION OF F/L RACK & CAM GEAR

b. Make sure that part "A" of the RELAY LEVER, when assembled in the CONNECT PLATE, is fully rotated to the left side of "B" of the MAINBASE, and is touching boss "C" of the MAINBASE as, shown in Fig.4-2.

FIg.4-2 DATUM POSITION OF RELAY LEVER & CAM GEAR

Page 22

c. When reassembling the L/C BRACKET TOTAL ASSEMBLY on the MAINBASE, make sure that the two triangular marks of CAM SWITCH are aligned with each other as shown in Fig.4-3.

FIg. 4-3 DATUM POSITION OF CAM SWITCH TRIANGULAR MARKS

d. Make sure that boss "A" of the PINCH LEVER TOTAL ASSEMBLY is positioned at point "B" of the CAM GEAR, as shown in Fig.4-4.

FIg.4-4 DATUM POSITION OF PINCH LEVER TOTAL ASS'Y & CAM GEAR

Page 23

  • e. Make sure that the triangular mark "A" on the L LOADING ASSEMBLY is aligned with the notch "B" on the R LOADING ASSEMBLY as shown in Fig. 4-5.
  • f. Make sure that the teeth of the LOADING RACK ASSEMBLY are aligned with those of the R LOADING ASSEMBLY so that the hole of the LOADING RACK ASSEMBLY aligns with the circular mark on the R LOADING ASSEMBLY, as shown in Fig.4-5.

FIG. 4-5 DATUM POSITION OF LOADING RACK ASS'Y & R/L LOADING LEVER ASS'YS

Page 24

4-2. BACK TENSION MEASUREMENT (See Fig.4-6~4-7)

  • a. Confirm that the position of the TENSION POLE is correctly POSITIONED. Refer to the "4-4 TENSION POLE POSITION ADJUSTMENT ".
  • b. Play back a T-120 TAPE at its center position without assemblying F/L ASSEMBLY and wait until the TAPE running is stabilized (about 5~10 seconds).
  • c. Bring the TENTELOMETER into contact with the TAPE (Fig.4-6) and measure the BACK TENSION. The measuring result should be between 25 and 33 grams.
  • d. If the measuring result is not within this specification, refer to the NOTE below or repeat "4-4 TENSION POLE POSITION ADJUSMENT". (Fig. 4-7)

FIg.4-6 BACK TENSION MEASUREMENT

NOTE:

  • If the measuring result is not within the specification, change the TENSION SPRING position. (To decrease the result, choose hook A. Otherwise, choose hook B).
  • Confirm that all of the three probes of the TENSION METER are in contact with the TAPE. During this process, don't touch any other parts of the MECHANISM (i.e, MAINBASE).
  • It is recommended that this measurement be repeated at least three times for an accurate reading.
Page 25

4-3. MECHANICAL MODE (OPERATING THE VCR WITHOUT A CASSETTE TAPE)

  • a. Remove the FRONT LOADING MECHANISM from the DECK MECHANISM.
  • b. Pull the F/L RACK.
  • c. The S/T POLE BASES are loaded and PLAY BACK MODE starts.
  • d. Turn off the power when the MECHANISM is in the desired position.

4-4. TENSION POLE POSITION ADJUSTMENT

  • a. MAKE MECHANICAL MODE be PLAY MODE. Refer to "4-3 MECHANICAL MODE".
  • b. Confirm that the datum hole of TENSION LEVER is aligned with the datum hole of the MAIN BASE.
  • c. If requirement "b" is not satisfied, turn the BAND BRAKE ADJUST CAP clockwise or counter-clockwise until the two datum hole are aligned with each other.

FIg.4-7 TENSION POLE POSITION ADJUSTMENT

Page 26

B. ADJUSTMENT OF THE A/C HEAD ASS'Y (TILT ADJUSTMENT)

  • a. Play back a T-120 Tape and check the running condition of the TAPE at the lower flanges of the T GUIDE POST ASS'Y (1) in Fig. 5-1.
  • b. Adjust the A/C HEAD TILT SCREW untill the TAPE runs stable as shown in Fig. 5-2
  • *Measuring Point : T-GUIDE POST BOTTOM
  • *Adjust Point : A/C HEAD TILT SCREW

  • a. Play back the ALIGNMENT CASSETTE TAPE (DN2: SP, NTSC, 7KHz).
  • b. Observe audio signals on an OSCILLOSCOPE.
  • c. Turn the A/C HEAD AZIMUTH SCREW to obtain the maximum audio output signal (-9~-3dBm).
  • *Measuring Point: AUDIO OUTPUT *Adjust Point : A/C HEAD AZIMUTH SCREW

FIg. 5-2 A/C HEAD ASS'Y ADJUSTMENT (TILT ADJUSTMENT)

Fig. 5-3 A/C HEAD ASS'Y

D. THE HEIGHT ADJUSTMENT OF A/C HEAD

  • a. Play back a T-120 TAPE.
  • b. Make sure that the gap is 0.25mm between the lower end of TAPE and that of A/C HEAD.
  • c. When the gap is longer than 0.25mm, turn the A/C HEAD HEIGHT ADJUST NUT counter-clockwise. When the gap is shorter than 0.25mm, turn it clockwise.

Repeat this procedure untill 0.25mm is obtained.

  • *Measuring Point : AUDIO OUTPUT
  • *Adjust Point : A/C HEAD NUT

Flg. 5-4 A/C HEAD ASS'Y ADJUSTMENT (HEIGHT ADJUSTMENT)

Page 27

E.PG SHIFT ADJUSTMENT(See Fig 5-5)

*Measuring Point : CN41 #PIN 4(HEAD S/W PULSE) R219(VIDEO OUT) *Adjust Point : VR41(100K):MAIN CIRCUIT BOARD

Phase generator(PG)shifter decides the VIDEO HEAD switching point when a TAPE is played back In case thePhase generator(PG)shifter isn't correctly tuned, HEAD switching noise or vertical jitter may occur.

a.Connect the channel-1 scope probe to the HEAD S/W PULSE TEST PIN(CN41 4) b.Connect the channel-2 scope probe (1V/div.)to the VIDEO OUT (R209) c.Play back the ALIGNMENT TAPE(COLOR BAR SIGNAL OR MONOSCOPE SIGNAL) d.Adjust the PG volume for time interval of 6.5H±0.5H between switching pulse and V-sync signal.

Page 28
F.DRUM ENTRANCE/EXIT(See Fig 5-6,5-7)

*Measuring Point : CN41 #PIN 3(VIDEO ENVELOPE) CN41 #PIN 4(HEAD S/W PULSE) *Adjust Point : S/T GUIDE ROLLER

a.Connect the channel-1 scope probe to the HEAD S/W PULSE TEST PIN(CN41 pin4)

b.Connect the channel-2 scope probe (1V/div.)to the VIDEO ENVELOP (CN41 pin5) .

c.Play back the ALIGNMENT TAPE(COLOR BAR SIGNAL OR MONOSCOPE SIGNAL)

d.Adjust X-Position(Connect Head S/W and ch 1 of scope, CTL PULSE(CN41 pin4)and ch2 after that Insert SP mode tape into the Deck.

Please adjust X-Position BOSS to be same both Timming of ch 1/ch 2 at initial Play and Timming after Auto-Tracking

e.Please adjust S/T Guide Roller in order to Flat Frequency of Video Envelope during the Playing

f.Please Check the Start part and Ending Part Video Envelop Frequency during Auto tracking Function.

If the Frequency was not Flat, Please readjust S/Tguide Roller to be Flat.

Fig5-6 FINE TUNING OF THE ENVELOPE AT THE DRUM ENTRANCE/EXIT (I)

Fig5-7 FINE TUNING OF THE ENVELOPE AT THE DRUM ENTRANCE/EXIT (II)

Page 29
G. AUDIO OUTPUT (A/C HEAD TILT & HEIGHT ADJUSTMENT)
TEST POINTS AUDIO OUTPUT AUDIO OUTPUT JACK
MEASURING EQUIPMENT OSCILLOSCOPE

a. Connect the OSCILLOSCOPE to the AUDIO OUTPUT JACK.

b. Play back the ALIGNMENT TAPE (DN1, 1KHz).

c. Check the AUDIO OUTPUT SIGNAL is -9~-3dBm.

d. If the requirement "c" is not satisfied, adjust the A/C HEAD TILT SCREW and A/C HEAD HEIGHT NUT to obtain the maximum audio output. (Fig. 5-3)

H. A/C HEAD AZIMUTH ADJUSTMENT

a. Connect the OSCILLOSCOPE to the AUDIO OUTPUT JACK.

b. Play back the ALIGNMENT TAPE (STAIR STEPS, 7KHZ).

c. Adjust the A/C HEAD AZIMUTH SCREW to obtain the audio output -9~-3dBm. (Fig. 5-3)

d. Repeat the process "H. DRUM ENTRANCE/EXIT".

TEST POINTS AUDIO OUTPUT JACK
MEASURING EQUIPMENT OSCILLOSCOPE
I.X-POSITION

*Measuring Point : CN41 #PIN 5(CTL PULSE) CN41 #PIN 4(HEAD S/W PULSE) *Adjust Point : X-POSITION ADJUST BOSS

a.Connect the channel-1 scope probe to the HEAD S/W PULSE TEST PIN(CN41 pin4)

b.Connect the channel-2 scope probe (1V/div.)to the CTL PULSE(CN41 pin5)

c. Play back the ALIGNMENT TAPE(COLOR BAR SIGNAL OR MONOSCOPE SIGNAL)

d.Adjust X-Position(Connect Head S/W and ch 1 of scope, CTL PULSE(CN41 pin4)and ch2 after that Insert SP mode tape into the Deck.

Please adjust X-Position BOSS to be same both Timming of ch 1/ch 2 at initial Play and Timming after Auto-Tracking

e.Please Check the Start part and Ending Part Video Envelop Frequency during Auto tracking Function.

If the Frequency was not Flat, Please readjust S/Tguide Roller to be Flat.

f.Once you readjust the X-Position, be careful not to misadjustment due to out of range.

Page 30

6. EXPLODED VIEW AND PARTS LIST

6-1. EXPLODED VIEW OF DECK ASS'Y (TOP VIEW)

Page 31

BVIANAM2035M : MICOM

. Pin diagram of QFP 100 PIN

90 97 96 9 9 93 92 ۹ 90 (09) 68 07 66 (85) • (13) 82 (8)
ğ 13 8 ШĦ 1-11 3 N
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9 		• V55 м
9 		A NY N N × а
Л 		л
Г
1 START SENSOR ž ب
ر 		2 Ű U 1 ī 74 ž 3 U ů u T/R SEN
(2) OPTION 5 ₹ S/R SEN
3 CAP F/R MUTE(VCR)
POWER FAIL ( ( C. PWN
5 P.G DELAY , D, PWM
6 END SENSOR DEG
7 PATH ADJ ۴ 6 DLY
B A.F.T
9 Y/C DC-ENVE IZC DATA2
10 HIFI DC-ENVE IZC CLK2
I мите (ти
12 SECAN ID IZC DATAI
(13) OV SYNC izc clki
(14) REMOCON IN POL
E C. ROTARY CAM C
ID HA SW
D COMPARE R
(B) H. 5W 6
19 POWER LED 8
28 REC SAFETY
(2) REC_LED ÐLK
22 TIMER RECLIED V.SYNC
23 KEY 3 · C.SYNC
24 KEY 2 NUÐ
25 KEY 1 VIDEO IN
26 KEY OUTI V HOLD
27 KEY OUT2 HLF
28 KEY 0013 • VEC
29 KEY OUT4 F c.v. out
CIAL CONTRACT ₩
. 12 		5 ਜ E LGCHA
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Page 32

■ BVILA71570M : HEAD AMP + VIDEP+AUDIO 1CHIP IC

. Pin diagram of QFP 100 PIN

Page 33
INTERNAL BLOCK AND DIAGRAM IC'S TDA8841/2 (One-chip TV-processor) . Pin diagram of SDIL-56 SOUND IF INPUT 1 56 DECOUPLING SOUND DEMODULATOR 55 AUDIO DEEMPHASSIS EXT AUDIO INPUT 2 54 TUNER AGC OUTPUT VCO REF FUTER 53 ACC DECOUPLING CAPACITOR VCO REF FILTER 52 REREFERENCE CURRENT INPUT PLI LOOP FILTER IF VIDEO OUTPUT 6 51 VERT SAWTOOTH CAPACITOR BUS INPUT : SCL 7 50 FHT/OVERVOLTAGE PROTECTION INP 49 IF INPUT BUS INPUT : SDA 8 48 IF INPUT BANDCAR DECOUPLING 47 VEG DRIVE NEG CHROMA INPUT )A8841/2 46 VEG DRIVE POS V/CVBS_INPLIT 11 MAIN POSITIVE SUPP 12 45 EAST-WEST DRIVE 44 GROUND INT CVBS INPUT 13 43 PHI1 FUTER GROUND 14 42 PH12 FILTER/FLASH PROL AUDIO OUTPUT 15 DECOUPLING FUITER 16 41 SANDCASTILE OUT/FLAY BACK IN TUNNING 17 EXT CVBS INPUT 40 HOR OUTPUT BLACK CURRENT INP 18 39 BLACK PEAK HOLD CAPACITOR 19 38 CVBS OUTPUT BLUE OUTPUT 20 37 POSITIVE SUPPLY GREEN OUTPUT 36 LOOPFILTER BURST PHASE DET RED OUTPUT 22 35 X-TAL (4.43/3.58) BEAM CUR LIMITER RED INPUT 23 34 X-TAL (3.58) 24 33 SECAM REF OUTPUT GREEN INPUT BLUE INPUT 25 32 R-Y INPUT RGB INSERTION SW 26 31 B-Y INPUT 27 LUMINANCE INPUT 30 R-Y OUTPUT 28 LUMINANCE OUTPUT 29 B-Y OUTPUT
Page 34

KA5Q0765RT(S/W FET)

. Pin diagram of PENTAWATT-5

TDA8356-N6 ( VERTICAL DEFLEVTION CIRCUIT )

. Pin diagram of SIL-9P

Page 35

■ TDA6107Q ( 3 IN 1 VIDEO AMP WITH BCS ) . Pin diagram of SIP-9

■ KA8301(KA3082B): LOADING MOTOR DRIVE IC

. Pin diagram of SIPH-B 10

Page 36

FA7610CP(PWM Type Switching Voltage Control IC)

. Pin diagram of DIP 8 PIN

. FEATURES

  • . PWM-type switching power control
  • . Timer latch short-circuit protection function
  • . Maximum output duty:64% typical
  • . Totem-pole pre-driver
2SK2903-01MR(POWER MOSFET)

MCR106-6(SCR)

Page 37

Block diagram

Page 38

Connection diagram

Page 39

SCHEMATIC DIAGRAM ( PAL B/G.DK. I . SECAM B/G.D/K )

0 R-OHM KEC (NPR 25C174050 KTC1815)

2. CAPACITOR ALL CAPACITORS ARE EERAMIC 58V CAPACITOR. UNLESS OTHERWISE NOTED THE FOLLOWING MARKS. UNITS IS UP.OTHERWISE NOTED.

ELECTRONIC CAP. *16 BIPOLAR CAP. NP
HIGH CZY CAP. HR LOW LEAKAGERZ TYPEICAP. ٢
POLYESTER FILM CAP. ۲ TANTALUM CAP. Ð
POLYPROPYLENE CAP. PP TEMP. COMPENSATION CAP. ٥
METALIZED POLYESTER FILM CAP. MP

Page 40

SCHEMATIC DIAGRAM ( PAL B/G.DK.I. SECAM B/G.D/K )

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