Daewoo K3050MECHA User Manual

S/M No. : K3050MECHA

Service Manual

VCR MECHANISM UNIT

(K50 / K30-MECHA DECK)

DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe .co.kr

March. 2000

CONTENTS

1. MECHANISM DESCRIPTION .................................................................................................2

2. ASSEMBLY DIAGRAM & MAJOR P ARTS CHECK..............................................................5

3. DISASSEMBLY AND REPLACEMENT................................................................................12

4. MECHANICAL ADJUSTMENT..............................................................................................22

5. ADJUSTMENT OF T APE TRANSPORTING SYSTEM.......................................................27

6. EXPLODED VIEW AND P ARTS LIST....................................................................................37

1) K30-MECHA DECK follows the VHS standard.

2) K30-MECHA DECK uses three motors (DRUM MOTOR, CAPST AN MOTOR and L/C MOTOR)

3) K30-MECHA DECK uses L/C MOTOR to drive FRONT LOADING.

4) K30-MECHA DECK recognizes each mode by using a 4-BIT MODE signal. This 4-BIT MODE signal is generated by the CAM SWITCH which is driven by the L/C MOTOR.

5) K30-MECHA DECK is operated by 7 MODES (EJECT/INITIAL/REV/IDLE/PLAY, STOP, SLOW/BRAKE/FF & REW).

6) K30-MECHA DECK reduces the mode shifting time, that is, picture playing time by using the FULL LOADING SYSTEM that has the DRUM wrapped by the tape.

K30-MECHA DECK is seperated from the Main PCB. When assembling, it is connected by B-B TYPE

CONNECTOR. The CAPST ANMOTOR and DRUMOUTPUT of K30-MECHA DECK and the MAIN PCB DECK are directly connected without using cable.

1.DESCRIPTION OF THE MECHANISM

1-1 CHARACTERISTIC OF THE K30-DECK MECHANISM

1-2-1) WIRE DIAGRAM

1-2 WIRE DIAGRAM

1-2-2) CONNECTOR PIN ARRANGEMENT

CN-1 (2 HEAD MONO)

1 SP-L 2 COMMON 3 SP-R 4 GND

CN-1 (4 HEAD MONO)

1 SP-L 2 COMMON 3 SP-R 4 GND 5 EP-R 6 COMMON 7 EP-L

CN-C

1 L/C MT (+) 2 L/C MT (–) 3 GND 4 CAM D 5 CAM C 6 CAM B 7 CAM A

CN-1 (4 HEAD HI-FI)

1 A-L 2 COMMON 3 A-R 4 SP-L 5 COMMON 6 SP-R 7 GND 8 EP-R 9 COMMON

10 EP-L

CN-D

1 CTL 2 CTL 3 AUDIO 4 AUDIO 5 ERASE 6 GND

CN-2

1 EVER 5V 2 CAPST AN F/R 3 CAPST AN FG 4 CTL-REF 5 CTL 6 I-LIMIT 7

CAPST AN M/T 12V/18V 8 GND 9 IC GND

10 NON CONT ACT

CN-B

1 FE HEAD 2 GND

CN-A

1 GND 2 DRUM SPD CTL 3 Vcc 4 DRUM FG 5 DRUM PG 6 NON CONNECT 7 NON CONNECT

❉ Capstan M/T Voltage of

No.7 is 12V for normal model and 18V for HIREW model.

ASSEMBLY DIAGRAM & MAJOR PARTS CHECK

2-1. ASSEMBLING DIAGRAM

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

A. TOP VIEW

)

(

1. FE HEAD

2. S SLANT POLE ASS'Y

3. TENSION BAND ASS'Y

4. REEL T ABLE

5. MAIN BASE ASS'Y

6. RECORD SAFETY LEVER

7. S SUB BRAKE ASS'Y

8. S MAIN BRAKE ASS'Y

9. IDLER PLA TE TOTAL ASS'Y

10. T MAIN BRAKE ASS'Y

11. T-SUB BRAKE ASS'Y

12. RELA Y LEVER

13. CAPST AN MOTOR

14. PINCH LEVER TOT AL ASS'Y

15. L/C BRKT TOT AL ASS'Y

16. CAM GEAR

17. A/C HEAD TOT AL ASS'Y

18. T SLANT POLE ASS'Y

19. DRUM TOT AL ASS'Y

B. BOTTOM VIEW

1. CAPST AN MOTOR

2. F/L RACK

3. CONNECT PLA TE

4. REEL BEL T

5. REEL GEAR TOT AL ASS'Y

6. RECORD SAFETY LEVER

7. L LOADING ASS'Y

8. R LOADING ASS'Y

9. DRUM TOT AL ASS'Y

10. LOADING RACK ASS'Y

2-1-2) P AR TS LOCATION OF FRONT LOADING ASS'Y

A. TOP VIEW

B. FRONT VIEW

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 LUBRICA TION

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 CAPST AN SHAFT

S GUIDE ROLLER T GUIDE ROLLER PINCH 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 T ABLE CAPST AN FLYWHEEL/PULLEY REEL PULLEY

B. LUBRICA TION

S REEL POST T REEL T ABLE POST REEL GEAR POST

After cleaning these parts with alcohol, lubricate these with one or two drops of oil.

2-2. PERIODIC MAINTENANCE AND SERVICE SCHEDULE

2-2-3) SERVICE SCHEDULE FOR THE MAJOR PAR TS

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

: Check and Replace if necessary . : Replace

PERIODIC SERVICE (TIME)

NAME

1000 2000 3000 4000 5000

DRUM TOT AL ASS'Y ¡¡¡¡¡

CAPST AN MOTOR ¡ L/C BRKT TOT AL ASS'Y REEL BEL T IDLER PLA TE TOTAL ASS'Y REEL T ABLE T SUB BRAKE ASS'Y TENSION BAND ASS'Y S MAIN BRAKE ASS'Y T MAIN BRAKE ASS'Y PINCH ROLLER ASS'Y AC HEAD ASS'Y FE HEAD REEL GEAR TOT AL ASS'Y

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

2-3-1) LIST OF JIGS AND TOOLS

2-3. JIGS AND TOOLS

FIG.

NO ITEMS MODEL

N O

REMARKS

NTSC: SP MONOSCOPE 7KHz CHECKING OF THE

1 ALIGNMENT T APE SP COLORBAR 1KHz

T APE TRANSPOR TING

(EP MONOSCOPE) SYSTEM

P AL/SCAM: SP MONOSCOPE 6KHz

SP COLORBAR 1KHz (LP MONOSCOPE)

CLEANING T APE

DHC-602V

CHECKING OF THE T APE

(DAEWOO) TRANSPORTING SYSTEM

CASSETTE T APE KT-300NV

MEASUREMENT OF

(KOKUSAI) KT-300RV REEL TORQUE

VHS SPINDLE

TSH-V4

MEASUREMENT OF

HEIGHT GAUGE REEL HEIGHT

TENTELO METER

T2-H7-UM

MEASUREMENT OF

(TENTELO) THE BACK TENSION

FAN TYPE MEASUREMENT OF THE

6 TENSION METER BELOW 3KG

PRESSING FORCE FOR THE PINCH ROLLER

7 DENT AL MIRROR

CHECKING OF THE T APE TRANSPORTING SYSTEM

+DRIVER

-1 ASSEMBLY,

8 HEX DRIVER

-2 DISASSEMBLY AND ADJUSTMENT

ADJUSTMENT DR IVER

-3

2-3-2) SKETCH OF JIGS AND TOOLS

ALIGNMENT TAPE

8-1

8-2

8-3

CLEANING TAPE

VHS SPINDLE

HEIGHT GAUGE

3. DISASSEMBLY AND REPLACEMENT

3-1. FRONT LOADING ASS'Y REMOVAL (See Fig. 3-1)

a. Remove 2 screws fixing the Front Loading ASS'Y. b. Lift the rear of the front loading assembly to separate it from the Main Base.

NOTE:

The FRONT LOADING ASSEMBLY can be removed only in the eject position.

AF002

Fig.3-1 FRONT LOADING ASS'Y SEPARATION

3-2. DISASSEMBL Y 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)

Remove one screw holding the PRISM LINK R and remove the PRISM LINK

R from the F/L BRACKET R.

(Fig. 3-3)

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)

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

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