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Daewoo K50 Service Manual
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Daewoo K50 Service Manual

Daewoo K50 Service Manual

Vcr mechanism unit, mecha deck
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S/M No. : K3050MECHA
Service Manual
VCR MECHANISM UNIT
(K50 / K30-MECHA DECK)
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
March. 2000

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Summary of Contents for Daewoo K50

  • Page 1 S/M No. : K3050MECHA Service Manual VCR MECHANISM UNIT (K50 / K30-MECHA DECK) DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr March. 2000...

  • Page 2: Table Of Contents

    CONTENTS 1. MECHANISM DESCRIPTION ....................2 2. ASSEMBLY DIAGRAM & MAJOR PARTS CHECK ..............5 3. DISASSEMBLY AND REPLACEMENT ................12 4. MECHANICAL ADJUSTMENT....................22 5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM............27 6. EXPLODED VIEW AND PARTS LIST..................37...

  • Page 3: Mechanism Description

    1.DESCRIPTION OF THE MECHANISM 1-1 CHARACTERISTIC OF THE K30-DECK MECHANISM 1) K30-MECHA DECK follows the VHS standard. 2) K30-MECHA DECK uses three motors (DRUM MOTOR, CAPSTAN 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.
  • Page 4 1-2 WIRE DIAGRAM 1-2-1) WIRE DIAGRAM...
  • Page 5 1-2-2) CONNECTOR PIN ARRANGEMENT CN-1 (2 HEAD MONO) CN-A SP-L DRUM SPD CTL COMMON SP-R DRUM FG DRUM PG NON CONNECT NON CONNECT CN-B FE HEAD CN-1 (4 HEAD MONO) CN-C CN-2 L/C MT (+) SP-L EVER 5V L/C MT (–) COMMON CAPSTAN F/R SP-R...

  • Page 6: Assembly Diagram & Major Parts Check

    2.ASSEMBLY DI A GRAM & MAJOR PARTS CHECK 2-1. ASSEMBLING DIAGRAM 2-1-1) ASSEMBLING DIAGRAM OF DECK ASS'Y A. TOP VIEW & 1. FE HEAD 11. T-SUB BRAKE ASS'Y 2. S SLANT POLE ASS'Y 12. RELAY LEVER 3. TENSION BAND ASS'Y 13.
  • Page 7 B. BOTTOM VIEW 1. CAPSTAN MOTOR 6. RECORD SAFETY LEVER 2. F/L RACK 7. L LOADING ASS'Y 3. CONNECT PLATE 8. R LOADING ASS'Y 4. REEL BELT 9. DRUM TOTAL ASS'Y 5. REEL GEAR 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.
  • Page 10 2-2-3) SERVICE SCHEDULE FOR THE MAJOR PARTS The following parts should receive periodic service, according to the recommended intervals. PERIODIC SERVICE (TIME) NAME 1000 2000 3000 4000 5000 DRUM TOTAL ASS'Y ¡ ¡ ¡ ¡ ¡ CAPSTAN MOTOR ¡ L/C BRKT TOTAL ASS'Y REEL BELT IDLER PLATE TOTAL ASS'Y REEL TABLE...
  • Page 11 SP COLORBAR 1KHz TAPE TRANSPORTING (EP MONOSCOPE) SYSTEM PAL/SCAM: SP MONOSCOPE 6KHz SP COLORBAR 1KHz (LP MONOSCOPE) CLEANING TAPE CHECKING OF THE TAPE DHC-602V (DAEWOO) TRANSPORTING SYSTEM CASSETTE TAPE KT-300NV MEASUREMENT OF (KOKUSAI) KT-300RV REEL TORQUE VHS SPINDLE MEASUREMENT OF...
  • Page 12 2-3-2) SKETCH OF JIGS AND TOOLS VHS SPINDLE HEIGHT GAUGE...

  • Page 13: Disassembly And Replacement

    3. DISASSEMBLY AND REPLACEMENT 3-1. FRONT LOADING ASS'Y REMOVAL (See Fig. 3-1) NOTE: The FRONT LOADING ASSEMBLY can be removed only in the eject position. 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. AF002 Fig.3-1 FRONT LOADING ASS'Y SEPARATION...
  • Page 14 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.
  • Page 15 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.
  • Page 16 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.
  • Page 17 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 c. Remove the LOADING RACK ASS'Y d.
  • Page 18 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 from the MAINBASE. c. Remove the A/C HEAD SPRING from the A/C HEAD ASSEMBLY NOTE: After reassembling, adjust the TAPE TRANSPORTING SYSTEM refering to...
  • Page 19 3-8. CAM GEAR, RELAY LEVER AND F/L RACK REMOVAL (See Fig.3-11) a. Remove the CAM GEAR from the MAINBASE. (Fig.3-11) b. Remove the RELAY LEVER from the MAINBASE. (Fig. 3-11) c. Remove the F/L RACK from the MAINBASE by pulling it in the direction of the arrow. NOTE: When reassembling, refer to Fig.
  • Page 20 3-10. TENSION BAND ASS'Y REMOVAL (See Fig.3-15, 3-16) a. Remove the TENSION SPRING from the MAINBASE . (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 . (Fig.3-16) NOTE: After assembling the TENSION BAND ASSEMBLY on the MAINBASE, adjust the position of TENSION POLE as shown Fig.
  • Page 21 3-11. CAPST AN MOTOR REMOVAL (See Fig.3-18) Remove 3 screws fixing the CAPSTAN MOTOR and separate the CAPSTAN MOTOR. 3-12. IDLER PLATE TOT AL ASS'Y & S/T REEL TABLE REMOVAL (See Fig.3-19) a. Remove one POLY WASHER from the REEL GEAR POST and remove the IDLER PLATE TOTAL ASSEMBLY from the MAIN...
  • Page 22 3-13. FE HEAD REMOVAL (See Fig.3-20) Remove one screw fixing the FE HEAD and remove the FE HEAD from the MAINBASE. 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 b.

  • Page 23: Mechanical Adjustment

    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.
  • Page 24 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. TRIANGLE MARKS MUST MEET EACH OTHER 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.
  • Page 25 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.
  • Page 26 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).
  • Page 27 4-3. MECHANICAL MODE (OPERATING THE VCRWITHOUT 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.

  • Page 28: Adjustment Of Tape Transporting System

    5. ADJUSTMENT OF TAPE TRANSPORTI N G SYSTEM Generally the TAPE TRANSPORTING SYSTEM has been precisely adjusted in the factory and does not ordinarily require readjustment. But when noise and tape damage take place and part assemblies that compose the TAPE TRANSPORTING SYSTEM are replaced, check and readjust the TAPE TRANSPORTING SYSTEM.
  • Page 29 Fig. 5-1 THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM When the parts as shown in Fig. 5-1 are replaced, the TAPE TRANSPORTING SYSTEM has changed. To prevent this, it is essential to know thoroughly and observe the following INSTRUCTIONS. A. ADJUSTMENT OF THE S/T GUIDE ROLLER a.
  • Page 30 B. ADJUSTMENT OF THE A/C HEAD ASS'Y (TILT ADJUSTMENT) TURN THE A/C HEAD TILT SCREW TO THE DIRECTION OF CW 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 ¤æin Fig.
  • Page 31 E. X-POSITION ADJUSTMENT S/W PULSE TEST PIN PATH ADJ. FIXTURE TEST POINTS ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE VR CONTROL PATH ADJ. FIXTURE ADJUSTMENT ADJUST BOSS MAIN BASE. a. Connect the path adjustment fixture to PT01 of the MAIN CIRCUIT BOARD. b.
  • Page 32 F. PLAYBACK PHASE ADJUSTMENT (See Fig. 5-6) S/W PULSE TEST PIN PATH ADJ. FIXTURE TEST POINTS VIDEO OUT MAIN CIRCUIT BOARD MEASURING EQUIPMENT OSCILLOSCOPE ADJUSTMENT VR595 (PG SHIFTER) MAIN CIRCUIT BOARD Phase generator (PG) shifter decides the VIDEO HEAD switching point when a TAPE is played back. In case the Phase generator (PG) shifter isn't correctly tuned, HEAD switching noise or vertical jitter may occur.
  • Page 33 G. LINEARITY ADJUSTMENT S/W PULSE TEST PIN PATH ADJ. FIXTURE TEST POINTS ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE VR CONTROL PATH ADJ. FIXTURE ADJUSTMENT S/T GUIDE ROLLER TAPE TRANSPORTING SYSTEM a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b.
  • Page 34 H. DRUM ENTRANCE /EXIT (See Fig. 5-8, 5-9) S/W PULSE TEST PIN PATH ADJ. FIXTURE TEST POINTS ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE VR CONTROL PATH ADJ. FIXTURE ADJUSTMENT S/T GUIDE ROLLER TAPE TRANSPORTING SYSTEM a. Connect the PATH ADJ. FIXTURE to PT01 the MAIN CIRCUIT BOARD. b.
  • Page 35 I. REVIEW ¤ ¤ A A PLAY (See Fig. 5-10) S/W PULSE TEST PIN PATH ADJ. FIXTURE TEST POINTS ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE VR CONTROL PATH ADJ. FIXTURE ADJUSTMENT S/T GUIDE ROLLER TAPE TRANSPORTIN SYSTEM a.
  • Page 36 J. 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 (NTSC: DN1 (SP , 1KHz), PAL: DP1 (SP , 1KHz)). c.
  • Page 37 L. X-POSITION (See Fig. 5-11) S/W PULSE TEST PIN PATH ADJ. FIXTURE TEST POINTS ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE VR CONTROL PATH ADJ. FIXTURE ADJUSTMENT ADJUST BOSS MAIN BASE. a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b.

  • Page 38: Exploded View And Parts List

    6. EXPLODED VIEW AND PARTS LIST 6-1. EXPLODED VIEW OF DECK ASS'Y (TOP VIEW)
  • Page 39 6-2. EXPLODED VIEW OF DECK ASS'Y (BOTTOM VIEW)
  • Page 40 6-3. EXPLODED VIEW OF F/L ASS'Y...
  • Page 41 D0040 D0020 D0040 D0050 D0010 D0060 D0070 D0080 D0090...
  • Page 42 6-4-1. PARTS LIST OF DECK TOTAL ASS'Y LOC. STOCK NO. PART NAME DESCRIPTION NTSC M1OOO 97PC0245D- DECK TOTAL AS DRN-9200(2HD SP/EP MONO NON) M1OOO 97PC0246D- DECK TOTAL AS DRN-9201(2HD SP/EP MONO NON, HEAD CLNER) M1OOO 97PC0269D- DECK TOTAL AS DRN-9220(2HD SP/EP MONO DLC) M1OOO 97PC0266D- DECK TOTAL AS...
  • Page 43 LOC. STOCK NO. PART NAME DESCRIPTION SECAM 97PC0345D- DECK TOTAL AS DRS-9400(4HD MONO NON) 97PC0346D- DECK TOTAL AS DRS-9420(4HD MONO DLC) 97PC0347D- DECK TOTAL AS DRS-9600(4HD HI-FI NON) 97PC0254D- DECK TOTAL AS DRS-9620(4HD HI-FI DLC) SECAM 97PC0327D- DECK TOTAL AS DRS-9400N(4HD MONO NON) 97PC0325D- DECK TOTAL AS...
  • Page 44 6-4-2. PARTS LIST OF DRUM PRICE ASS’Y LOC. STOCK NO. PART NAME DESCRIPTION NTSC AD001 97PA277471 DRUM PRICE AS CYN-T212(2HD SP/EP DLC) AD001 97PA264841 DRUM PRICE AS CYN-T213(2HD SP/EP BLK) AD001 97PA269001 DRUM PRICE AS CYN-T410(4HD MONO NON) AD001 97PA277571 DRUM PRICE AS CYN-T412(4HD MONO DLC) AD001...
  • Page 45 6-4-3.PARTS LIST OF DRUM TOTAL ASS’Y LOC. STOCK NO. PART NAME DESCRIPTION DRUM AS D0010 DRUM AS REFERRING TO LIST OF DRUM PRICE ASS Y D0030 97SA324400 DRUM M/T AS E20XL-25 K30,K50 D0030 97SA327100 DRUM M/T AS DMVDMTO4M K30,K50 D0040 7001260711 SCREW MACHINE PAN 2.6X7 MFZN...
  • Page 46 LOC. STOCK NO. PART NAME DESCRIPTION A2000 7274300611 SCREW TAPPTITE TT3 RND 3X6 MFZN K30,K50 A2100 97SA311620 IDLER PLATE AS K30-MECHA(HI-REW) A2100 97SA311600 IDLER PLATE AS K50-MECHA(NORMAL) A2200 97S3108200 POLYWASHER D2.6XD6.0XT0.5 K30,K50 A2300 97S2901600 TABLE REEL F20 BLACK K30,K50 A2400 97S3903600 POLY SLIDER D3.1XD6XT0.5...
  • Page 47 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : "DAEWOOELEC" E-mail : G7F00E@web.dwe.co.kr TEL : 82-2-360-7802 FAX : 82-2-360-7877...

This manual is also suitable for:

K30K50-mecha deckK30-mecha deck