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Manual Daewoo K3050MECHA

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  • Daewoo K3050MECHA - page 1

    S/M No . : K3050MECHA March. 2000 D AE W OO ELECT R ONICS C O . , L T D . http : //svc.dwe .co .kr Service Manual VCR MECHANISM UNIT (K50 / K30-MECHA DECK) ...

  • Daewoo K3050MECHA - page 2

    1 CONTENTS 1. MECHANISM DESCRIPTION ................................................................................................. 2 2. ASSEMBL Y DIAGRAM & MAJOR P AR TS CHECK ..............................................................5 3. DISASSEMBL Y AND REPLACEMENT ....................................................................... ...

  • Daewoo K3050MECHA - page 3

    2 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-MECH ...

  • Daewoo K3050MECHA - page 4

    3 1-2-1) WIRE DIAGRAM 1-2 WIRE DIAGRAM ...

  • Daewoo K3050MECHA - page 5

    4 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 AUDI ...

  • Daewoo K3050MECHA - page 6

    5 2. ASSEMBL Y DIAGRAM & MAJOR P AR TS CHECK 2-1. ASSEMBLING DIAGRAM 2-1-1) ASSEMBLING DIAGRAM OF DECK ASS'Y A. TOP VIEW 8 9 7 6 5 4 3 2 1 ) ( * & ^ % $ # @ ! 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' ...

  • Daewoo K3050MECHA - page 7

    6 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 ...

  • Daewoo K3050MECHA - page 8

    7 2-1-2) P ARTS LOCA TION OF FRONT LOADING ASS'Y A. TOP VIEW B. FRONT VIEW ...

  • Daewoo K3050MECHA - page 9

    8 2-2-1) PERIODIC MAINTENANCE AND SERVICE SCHEDULE A. In order to ef fectively maintain the excellent per formance and fully utilize the features of this apparatus, and to lengthen the life of the mechanism and tapes, we strongly ur ge you to perform periodic maintenance and inspection, as described below . After repairing, do the maintenance descr ...

  • Daewoo K3050MECHA - page 10

    9 2-2-3) SERVICE SCHEDULE FOR THE MAJOR P ARTS The following parts should receive periodic service, accor ding 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 TOT AL ...

  • Daewoo K3050MECHA - page 11

    10 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 TRANSPORTING (EP MONOSCOPE) SYSTEM P AL/SCAM: SP MONOSCOPE 6KHz SP COLORBAR 1KHz (LP MONOSCOPE) 2 CLEANING T APE DHC-602V CHECKING OF THE T APE (DAEWOO) TRANSPORTING SYSTEM 3 CASSETTE ...

  • Daewoo K3050MECHA - page 12

    11 2-3-2) SKETCH OF JIGS AND TOOLS ALIGNMENT TAPE CLEANING TAPE 30 20 10 0 10 20 30 30 20 10 0 10 20 30 VHS SPINDLE HEIGHT GAUGE 8-1 8-2 8-3 ...

  • Daewoo K3050MECHA - page 13

    3. DISASSEMBL Y AND REPLACEMENT 3-1. FRONT LOADING ASS'Y REMOV AL (See Fig. 3-1) a. Remove 2 screws fixing the Front Loading ASS'Y . b. Lift the rear of the fr ont loading assembly to separate it fr om the Main Base. NOTE: The FRONT LOADING ASSEMBL Y can be removed only in the eject position. 12 AF002 Fig.3-1 FRONT LOADING ASS'Y SEPA ...

  • Daewoo K3050MECHA - page 14

    13 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 arr ow to separate it from the TOP PLA TE and CASSETTE HOLDER ASSEMBL Y. b. Remove the CASSETTE HOLDER ASSEMBL Y . (Fig. 3-2) c. Remove one screw holding the PRISM LINK R and r emove th ...

  • Daewoo K3050MECHA - page 15

    14 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 r emove the DOOR OPENER. (Fig. 3-4) f. Remove the LOADING LEVER ASSEMBL Y by pressing the connected section of the loading lever assembly in the directions of the arr ows. (Fig. 3-5) g. Remove the SAFETY SPRING between t ...

  • Daewoo K3050MECHA - page 16

    15 TOP PLATE INSERT POINTS 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) 3-3. DRUM ...

  • Daewoo K3050MECHA - page 17

    16 3-4. REEL BEL T , LOADING RACK ASS'Y , LOADING ASS'Y , S/T SLANT POLE ASS'Y REMOV AL (See Fig.3-8) a. T ur n over the DECK MECHANISM and remove the REEL BEL T . b. Remove one POL Y W ASHER . c. Remove the LOADING RACK ASS'Y . d. Remove R & L LOADING ASS'YS and . e. Remove the S and T SLANT POLES and by pulling them i ...

  • Daewoo K3050MECHA - page 18

    17 3-5. A/C HEAD ASS'Y REMOV AL (See Fig.3-10) a. Remove one nut hex from the A/C HEAD POST of the MAINBASE. b. Remove the A/C HEAD ASSEMBL Y fr om the MAINBASE. c. Remove the A/C HEAD SPRING from the A/C HEAD ASSEMBL Y . NOTE: After reassembling, adjust the T APE TRANSPORTING SYSTEM r efering to chapter 5 "ADJUSTMENT OF THE T APE TRANSPO ...

  • Daewoo K3050MECHA - page 19

    18 3-8. CAM GEAR, RELA Y LEVER AND F/L RACK REMOV AL (See Fig.3-11) a. Remove the CAM GEAR fr om the MAINBASE. (Fig.3-11) b. Remove the RELA Y LEVER from the MAINBASE. (Fig. 3-11) c. Remove the F/L RACK fr om the MAINBASE by pulling it in the direction of the arr ow . NOTE: When reassembling, r efer to Fig. 3-12, 13. 3-9. S/T MAIN & SUB BRAKE A ...

  • Daewoo K3050MECHA - page 20

    19 3-10. TENSION BAND ASS'Y REMOV AL (See Fig.3-15, 3-16) a. Remove the TENSION SPRING fr om the MAINBASE . (Fig.3-15) b. T ur n the DECK MECHANISM over . (Fig.3-16) c. After separating the tab of hook 'A', remove the TENSION BAND ASSEMBL Y . (Fig.3-16) NOTE: After assembling the TENSION BAND ASSEMBL Y on the MAINBASE, adjust the pos ...

  • Daewoo K3050MECHA - page 21

    20 3-11. CAPST AN MOTOR REMOV AL (See Fig.3-18) 3-12. IDLER PLA TE TOT AL ASS'Y & S/T REEL T ABLE REMOV AL (See Fig.3-19) Remove 3 screws fixing the CAPST AN MOTOR and separate the CAPST AN MOTOR. a. Remove one POL Y W ASHER from the REEL GEAR POST and remove the IDLER PLA TE TOT AL ASSEMBL Y from the MAIN BASE. b. Remove the S/T REEL T AB ...

  • Daewoo K3050MECHA - page 22

    21 3-13. FE HEAD REMOV AL (See Fig.3-20) 3-14. REEL GEAR TOT AL ASS'Y & CONNECT PLA TE REMOV AL (Fig.3-21) Remove one screw fixing the FE HEAD and remove the FE HEAD from the MAINBASE. a. T ur n over the DECK MECHANISM and remove one POL Y W ASHER from the REEL GEAR POST . b. After separating tab 'B' of the MAINBASE, remove the R ...

  • Daewoo K3050MECHA - page 23

    22 4. MECHANICAL ADJUSTMENT 4-1. MECHANICAL ADJUSTMENT (See Fig.4-1~4-5) When operational problems occur or the mechanism is reassembled, be sur e to confirm the following INSTRUCTIONS. a. Make sure that the DA TUM HOLE of the CAM GEAR is aligned with the DA TUM HOLE in the MAINBASE in the EJECT mode, as shown in Fig.4-1. b. Make sure that part &qu ...

  • Daewoo K3050MECHA - page 24

    23 c. When reassembling the L/C BRACKET TOT AL ASSEMBL Y on the MAINBASE, make sure that the two triangular marks of CAM SWITCH are aligned with each other as shown in Fig.4-3. d. Make sure that boss "A" of the PINCH LEVER TOT AL ASSEMBL Y is positioned at point "B" of the CAM GEAR, as shown in Fig.4-4. TRIANGLE MARKS MUST MEET ...

  • Daewoo K3050MECHA - page 25

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

  • Daewoo K3050MECHA - page 26

    25 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 T APE at its center position without assemblying F/L ASSEMBL Y and wait until the T APE running is stabilized (about 5~10 seconds). c. Brin ...

  • Daewoo K3050MECHA - page 27

    26 4-3. MECHANICAL MODE (OPERA TING THE VCR WITHOUT A CASSETTE T APE) 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 PLA Y BACK MODE starts. d. T ur n off the power when the MECHANISM is in the desired position. a. MAKE MECHANICAL MODE be PLA Y MODE. Refer to "4-3 MECHA ...

  • Daewoo K3050MECHA - page 28

    27 5. ADJUSTMENT OF T APE TRANSPOR TING SYSTEM Generally the T APE TRANSPORTING SYSTEM has been precisely adjusted in the factory and does not ordinarily requir e readjustment. But when noise and tape damage take place and part assemblies that compose the T APE TRANSPORTING SYSTEM are r eplaced, check and readjust the T APE TRANSPORTING SYSTEM. Ref ...

  • Daewoo K3050MECHA - page 29

    28 Fig. 5-1 THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM When the parts as shown in Fig. 5-1 are r eplaced, the T APE TRANSPORTING SYSTEM has changed. T o prevent this, it is essential to know thor oughly and obser ve the following INSTRUCTIONS. A. ADJUSTMENT OF THE S/T GUIDE ROLLER a. Play back a T -120 T APE. b. Make sure that excessive T AP ...

  • Daewoo K3050MECHA - page 30

    29 B. ADJUSTMENT OF THE A/C HEAD ASS'Y (TIL T ADJUSTMENT) a. Play back a T -120 T ape and check the running condition of the T APE at the lower flanges of the T GUIDE POST ASS'Y ¤æ in Fig. 5-1. b. Adjust the A/C HEAD TIL T SCREW untill the T APE runs stable as shown in Fig. 5-2 C. ADJUSTMENT OF THE AUDIO AZIMUTH (See Fig.5-3) a. Play ba ...

  • Daewoo K3050MECHA - page 31

    30 E. X-POSITION ADJUSTMENT a. Connect the path adjustment fixture to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT T APE (COLOR BAR ALIGNMENT). c. Connect channel-1 scope probe to S/W PULSE TEST PIN of P A TH ADJ, FIXTURE. d. Connect channel-2 scope probe to ENVELOPE TEST PIN of P A TH ADJ, FIXTURE. e. T ur n the VR CONTROL to the cen ...

  • Daewoo K3050MECHA - page 32

    31 F . PLA YBACK PHASE ADJUSTMENT (See Fig. 5-6) Phase generator (PG) shifter decides the VIDEO HEAD switching point when a T APE is played back. In case the Phase generator (PG) shifter isn't correctly tuned, HEAD switching noise or vertical jitter may occur . a. Connect the P A TH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play the A ...

  • Daewoo K3050MECHA - page 33

    32 G. LINEARITY ADJUSTMENT a. Connect the P A TH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT T APE (COLOR BAR SIGNAL). c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the P A TH ADJ. FIXTURE. d. Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the P A TH ADJ. FIXTURE. e. Adjust the VR CO ...

  • Daewoo K3050MECHA - page 34

    33 H. DRUM ENTRANCE /EXIT (See Fig. 5-8, 5-9) a. Connect the P A TH ADJ. FIXTURE to PT01 the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT T APE (COLOR BAR SIGNAL). c. Connect the channel-1 scope pr obe to the S/W PULSE TEST PIN of the P A TH ADJ. FIXTURE. d. Connect the channel-2 scope pr obe to the ENVELOPE TEST PIN of the P A TH ADJ. FIXTURE. e ...

  • Daewoo K3050MECHA - page 35

    34 I. REVIEW ¤ ¤ A A PLA Y (See Fig. 5-10) a. Connect the P A TH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT T APE (SP , COLOR BAR SIGNAL). c. Connect the channel-1 scope pr obe to the S/W PULSE TEST PIN of the P A TH ADJ. FIXTURE. d. Connect the channel-2 scope pr obe to the ENVELOPE TEST PIN of the P A TH ADJ. FIX ...

  • Daewoo K3050MECHA - page 36

    35 J. AUDIO OUTPUT (A/C HEAD TIL T & HEIGHT ADJUSTMENT) a. Connect the OSCILLOSCOPE to the AUDIO OUTPUT JACK. b. Play back the ALIGNMENT T APE (NTSC: DN1 (SP , 1KHz), P AL: DP1 (SP , 1KHz)). c. Check the AUDIO OUTPUT SIGNAL is -9~-3dBm. d. If the requir ement "c" is not satisfied, adjust the A/C HEAD TIL T SCREW and A/C HEAD HEIGHT NU ...

  • Daewoo K3050MECHA - page 37

    36 L. X-POSITION (See Fig. 5-11) a. Connect the P A TH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT T APE (COLOR SIGNAL BAR). c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the of the P A TH ADJ. FIXTURE. d. Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the P A TH ADJ. FIXTURE. e. Adj ...

  • Daewoo K3050MECHA - page 38

    37 6. EXPLODED VIEW AND P AR TS LIST 6-1. EXPLODED VIEW OF DECK ASS'Y (TOP VIEW) ...

  • Daewoo K3050MECHA - page 39

    38 6-2. EXPLODED VIEW OF DECK ASS'Y (BOTTOM VIEW) ...

  • Daewoo K3050MECHA - page 40

    39 6-3. EXPLODED VIEW OF F/L ASS'Y ...

  • Daewoo K3050MECHA - page 41

    40 D0040 D0020 D0050 D0010 D0080 D0090 D0060 D0070 D0040 ...

  • Daewoo K3050MECHA - page 42

    41 6-4-1. P ARTS LIST OF DECK TOT AL ASS'Y NTSC M1OOO 97PC0245D- DECK TOTAL AS DRN-9200(2HD SP/EP MONO NON) K50 M1OOO 97PC0246D- DECK TOTAL AS DRN-9201(2HD SP/EP MONO NON, HEAD CLNER) K 5 0 M1OOO 97PC0269D- DECK TOTAL AS DRN-9220(2HD SP/EP MONO DLC) K50 M1OOO 97PC0266D- DECK TOTAL AS DRN-9400(4HD MONO NON) K50 M1OOO 97PC0247D- DECK TOTAL AS DR ...

  • Daewoo K3050MECHA - page 43

    42 SECAM 97PC0345D- DECK TOTAL AS DRS-9400(4HD MONO NON) K30 97PC0346D- DECK TOTAL AS DRS-9420(4HD MONO DLC) K30 97PC0347D- DECK TOTAL AS DRS-9600(4HD HI-FI NON) K30 97PC0254D- DECK TOTAL AS DRS-9620(4HD HI-FI DLC) K30 SECAM 97PC0327D- DECK TOTAL AS DRS-9400N(4HD MONO NON) K50 97PC0325D- DECK TOTAL AS DRS-9420N(4HD MONO DLC) K50 97PC0326D- DECK TOT ...

  • Daewoo K3050MECHA - page 44

    43 6-4-2. P ARTS LIST OF DRUM PRICE ASS’Y 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 97PA264941 DRUM PRICE AS CYN-T413(4HD MONO BLK) AD001 97PA269101 DRUM PRICE A ...

  • Daewoo K3050MECHA - page 45

    44 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 K30,K50 D0050 97SA320400 EARTH GROUND AS T-DRUM K30,K50 D0060 97S2303600 HOLDER MAIN POM(KEPITAL F20) K30,K50 D ...

  • Daewoo K3050MECHA - page 46

    45 A2000 7274300611 SCREW TAPPTITE TT3 RND 3X6 MFZN K30,K50 A2100 97SA311620 IDLER PLATE AS K30-MECHA(HI-REW) K30 A2100 97SA311600 IDLER PLATE AS K50-MECHA(NORMAL) K50 A2200 97S3108200 POLYWASHER D2.6XD6.0XT0.5 K30,K50 A2300 97S2901600 TABLE REEL F20 BLACK K30,K50 A2400 97S3903600 POLY SLIDER D3.1XD6XT0.5 K30,K50 A2500 97SA310800 TENSION BAND AS K- ...

  • Daewoo K3050MECHA - 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 ...

Manufacturer Daewoo Category VCR

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