Instruction/ maintenance manual of the product K3050MECHA Daewoo
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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).
1 CONTENTS 1. MECHANISM DESCRIPTION ................................................................................................. 2 2. ASSEMBL Y DIAGRAM & MAJOR P AR TS CHECK ..............................................................5 3. DISASSEMBL Y AND REPLACEMENT .
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.
3 1-2-1) WIRE DIAGRAM 1-2 WIRE DIAGRAM.
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 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.
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.
7 2-1-2) P ARTS LOCA TION OF FRONT LOADING ASS'Y A. TOP VIEW B. FRONT VIEW.
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 .
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 .
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.
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.
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.
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 .
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.
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.
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.
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.
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 .
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 .
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.
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 .
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.
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.
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.
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).
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.
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.
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.
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.
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.
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 .
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.
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.
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.
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)).
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.
37 6. EXPLODED VIEW AND P AR TS LIST 6-1. EXPLODED VIEW OF DECK ASS'Y (TOP VIEW).
38 6-2. EXPLODED VIEW OF DECK ASS'Y (BOTTOM VIEW).
39 6-3. EXPLODED VIEW OF F/L ASS'Y.
40 D0040 D0020 D0050 D0010 D0080 D0090 D0060 D0070 D0040.
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.
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(.
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(4.
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.
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.
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.
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