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S/M No. : TMECHA
Service Manual
VCR MECHANISM UNIT
(T-MECHA DECK)
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
Feb. 2000
CONTENTS
1. ASSEMBLY DIAGRAM AND A/S ............................................................................................2 2. WIRE DIAGRAM........................................................................................................................5 3. PERIODIC MAINTENANCE AND SERVICE SCHEDULE ....................................................6 4. SERVICE SCHEDULE FOR THE MAJOR PARTS ................................................................7 5. JIGS AND TOOLS.....................................................................................................................8 6. DEASSEMBLY AND REPLACEMENT .................................................................................10 7. MECHANICAL ADJUSTMENT..............................................................................................16 8.ADJUSTMENT OF THE TAPE TRANSPORTING SECTION ..............................................19 9. EXPLODED VIEW AND PARTLIST .......................................................................................25
1
ASSEMBLY DIAGRAM AND A/S
1. Assembly diagram 1-1. DECK Assembly diagram A. Upper View
fig1-1 1 MAINBASE ASS'Y 2 DRUM ASS'Y 3 FE HEAD 4 S SLANT POLE ASS'Y 5 TENSION BAND ASS'Y 6 S BRAKE ASS'Y 7 S REEL TABLE 8 REEL BRKT TOTAL ASS'Y 9 IDLER PLATE TOTAL ASS'Y 10 T BRAKE ASS'Y 11 FL RACK 12 RELAY LEVER 13 CAPSTAN MOTOR 14 LC BRKT ASS'Y 15 PINCH LEVER TOTAL ASS'Y 16 CAM GEAR 17 AC HEAD ASS'Y 18 T SLANT POLE ASS'Y 19 HEAD CLEANER
2
ASSEMBLY DIAGRAM AND A/S (CONTINUED)
B. Lower View
fig1-2 20 L LOADING ASS'Y 21 R LOADING ASS'Y 22 CONNECT PLATE 23 REEL BELT 24 LOADING RACK
3
ASSEMBLY DIAGRAM AND A/S (CONTINUED)
1-2. FRONT LOADING Assembly diagram
fig2
1 FL BRKT L 2 TOP PLATE 3 SAFETY LEVER 4 LOADING LEVER AS4
5 CST HOLDER AS 6 DOOR OPENER 7 SAFETY LEVER R 8 FL BRKT R
4
WIRE DIAGRAM
1. Wire Diagram
2. Connector Pin Arrangement
5
PERIODIC MAINTENANCE AND SERVICE SCHEDULE
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. - 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.
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 · 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.
6
SERVICE SCHEDULE FOR THE MAJOR PARTS
SERVICE SCHEDULE FOR THE MAJOR PARTS
The following parts should receive periodic service, according to the recommended intervals.
PERIODIC SERVICE (TIME) NAME 1000 DRUM TOTAL ASS'Y CAPSTAN MOTOR L/C BRKT TOTAL ASS'Y REEL BELT IDLER PLATE TOTAL ASS'Y REEL TABLE TENSION BAND ASS'Y S, T BRAKE ASS'Y PINCH ROLLER ASS'Y AC HEAD ASS'Y FE HEAD REEL GEAR TOTAL ASS'Y : Check and Replace if necessary.
: Replace
2000
3000
4000
5000
Note: Even though the unit is not used frequently, cleaning, lubrication and replacement of the belt should be undertaken every 2 years.
7
JIGS AND TOOLS
1. List of Jigs and Tools
NO ITEMS MODEL NTSC: SP MONOSCOPE 7KHz SP COLORBAR 1KHz (EP MONOSCOPE) PAL/SCAM: SP MONOSCOPE 6KHz SP COLORBAR 1KHz (LP MONOSCOPE) DHC-602V KT-300NV KT-300RV TSH-V4 FIG. NO REMARKS CHECKING OF THE TAPE TRANSPORTING SYSTEM
1
ALIGNMENT TAPE
!
2
CLEANING TAPE (DAEWOO) CASSETTE TAPE (KOKUSAI) VHS SPINDLE HEIGHT GAUGE TENTELO METER (TENTELO) FAN TYPE TENSION METER
@
CHECKING OF THE TAPE TRANSPORTING SYSTEM MEASUREMENT OF REEL TORQUE MEASUREMENT OF REEL HEIGHT MEASUREMENT OF THE BACK TENSION MEASUREMENT OF THE PRESSING FORCE FOR THE PINCH ROLLER CHECKING OF THE TAPE TRANSPORTING SYSTEM ASSEMBLY, DISASSEMBLY AND ADJUSTMENT
3
#
4
$
5
T2-H7-UM
%
6
BELOW 3KG
^
7 8
DENTAL MIRROR
& *-1 *-2
+DRIVER
ADJUSTMENT DR IVER
8
JIGS AND TOOLS(CONTINUED)
2. Sketch of Jigs and Tools
!
@
ALI GN ME NT
TAP E
CLE ANI NG TAP E
#
$
30
20
10
20
0
10
10
20
%
^
&
*
9
30
30
20
VHS SPINDLE HEIGHT GAUGE
10
30
0
DEASSEMBLY AND REPLACEMENT
1. Removal of the FRONT LOADING Ass'y (Fig. 3.1)
NOTE: Remove the FRONT LOADING Ass'y in eject mode. a. Unscrew the 2 screw holding the F/L. b. Separate the F/L Ass'y from the MAINBASE settling down point by lifting the rear part of F/L (Screw Hole).
2. Deassembly of FRONT LOADING Ass'y (FIg. 3.2~3.5)
a. Remove the 1 washer for holding the door opener and separate F/L Assembly by moving the DOOR OPENER in the direction of arrow. b. Remove the 2 screw holding the TOP PLATE and separate the CASSETTE HOLDER Ass'y by moving the FL BRKT L and FL BRKT R in the direction of arrow. (Fig. 3.2)
Fig. 3.1 Removal of the FRONT LOADING Ass'y FIg. 3.2 Deassembly of the FRONT LOADING Ass'y c. Separate the FL LIFT SPRING by twisting and dragging from FL BRKT R. (Fig. 3.3)
FIg. 3.3 Deassembly of the FL BRKT Ass'y
10
DEASSEMBLY AND REPLACEMENT (CONTINUED)
d. Separate the LOADING LEVER Ass'y by pressing the connection point from the CASSETTE HOLDER Ass'y. (Fig. 3.4) e. Remove the SAFETY SPRING connecting the SAFETY LEVER and CASSTTE HOLDER PLATE. (Fig. 3.4) f. Remove the RELEASE SPRING connecting the RELEASE LEVER and SAFETY LEVER. (Fig. 3.4)
3. Deassembly of DRUM Ass'y (Fig. 3.6)
a. Turn over the DECK MECHANISM and holding the DRUM TOTAL Ass'y @ with hands, remove the 3 screw holding the drum total assembly with mainbase. b. Separate the DRUM TOTAL Ass'y from the deck paying attention there is no damage on the surface of VIDEO HEAD and DRUM. c. Assembly step is the reverse way of deassembly. CAUTION: · After the assembly of the DRUM TOTAL Ass'y, check out if DECK Mechanism operate smoothly and adjustment of tape transmission section is OK.
FIg. 3.4 Deassembly of the CASSETTE HOLDER Ass'y
CAUTION: · Assemble the FRONT LOADING Ass'y in the reverse step of deassembly. · Confirm that 2 bosses on the left side of the CASSETTE HOLDER Ass'y are inserted in the groove on the left side of the top plate. Insert 2 bosses on the right side of the CASSETTE HOLDER Ass'y into the groove of the F/L BRACKET R. (Fig. 3.5)
FIg. 3.6 Assembly of the DRUM TOTAL Ass'y
FIg. 3.5 Assembly of the FL Ass'y
11
DEASSEMBLY AND REPLACEMENT (CONTINUED)
4. Deassembly of LOADING RACK, LOADING ASS'Y, S/T SLANT POLE ASS'Y (Fig. 3.7, 3.8)
a. Turn out the DECK MECHANISM and remove the LOADING RACK@ after unscrewing the SCREW !. b. Disintegrate the R LOADING AS # and L LOADING AS $. c. Disintegrate the S SLANT POLE AS % and T SLANT POLE AS ^ by moving those part in arrow direction. CAUTION: · Take care GUIDE ROLLER of S/T SLANT POLE AS and SLANT POLE not to be stained with grease during assembly. · Refer to Fig. 3.8 in assembly.
5. Deassembly of the A/C HEAD ASS'Y (Fig. 3.9)
a. Remove the CONNECTOR @ from the AC HEAD Ass'y, watch out that there is no damage in the HEAD connecting PIN. b. Separate the AC HEAD Ass'y ! after unscrewing the screw #. CAUTION: · After the assembly, adjust the tape transmission section by refering to the chapter 5. · After the adjustment of the tape transmission section, paint the 3 adjustment screw with locking paint.
FIg. 3.7 Deassembly of the LOADING RACK, LOADING ASS'Y and the SLANT POLE ASS'Y
FIg. 3.9 Deassembly of the AC HEAD ASS'Y
FIg. 3.8 Assembly of the L/R LOADING AS and the LOADING RACK
12
DEASSEMBLY AND REPLACEMENT (CONTINUED)
6. Deassembly of the LC BRKT ASS'Y, PINCH LEVER TOTAL ASS'Y (Fig. 3.10)
a. Separate the LC BRKT Ass'y @ after removing the 3 screw !. b. Separate the LC BRKT Ass'y @ from the DECK MECHANISM. c. Disintegrate the PINCH LEVER TOTAL Ass'y #. CAUTION: · After the assembly of the PINCH LEVER TOTAL Ass'y, adjust the tape transmission section by refering to the chapter 5. · There should be no pollution on the surface of PINCH ROLLER $ with grease or other foreign material. · Make sure if the end of the PINCH SPRING PINCH "A" is located at the end of trajectory of CAM GEAR "B" in assembly. (Refer to Fig. 4.3)
7. Deassembly of the CAM GEAR, RELAY LEVER, FL RACK (Fig. 3.10)
a. Separate the CAM GEAR % from the MAINBASE. b. Separate the RELAY LEVER ^ from the MAINBASE. c. Separate the FL RACK & from MAINBASE by moving to the arrow direction. CAUTION: · When reassembling, refer to Fig. 3.11, Fig. 3.12 and chapter 4.
FIg. 3.11 Assembly of the CAM GEAR, RELAY LEVER
FIg. 3.12 Assembly of the CAM GEAR, FL RACK
FIg. 3.10 Deassembly of the LC BRACKET ASS'Y from the PINCH LEVER TOTAL ASS'Y
13
DEASSEMBLY AND REPLACEMENT (CONTINUED)
8. Deassembly of the S/T BRAKE ASS'Y (Fig. 3.13)
a. Unhook the S BRAKE SPRING # from the MAINBASE HOOK !. b. Remove the S BRAKE Ass'y @ from the mainbase. c. Remove the T BRAKE SPRING ^ from the MAINBASE HOOK $. d. Remove the T BRAKE Ass'y %.
11. Deassembly of the FE HEAD (Fig. 3.14)
a. Unscrew the screw ^ and separate the FE HEAD & from the MAINBASE.
FIg. 3.14 Deassembly of the TENSION BAND ASS'Y, CAPSTAN MOTOR and the FE HEAD FIg. 3.13 Deassembly of the S/T BRAKE ASS'Y
9. Deassembly of the TENSION BAND ASS'Y (Fig. 3.14)
a. Unhook the TENSION SPRING @ from the MAINBASE HOOK !. b. Unhook the MAINBASE HOOK "A" and remove the TENSION BAND Ass'y # from the mainbase. CAUTION: · After the assembly of TENSION BAND Ass'y on the mainbase, adjust the TENSION POLE location as shown in Fig. 3.15. · Avoid getting Grease, Oil or Foreign substance on the FELT of the BAND BRAKE. · Take care not to deform the MAINBASE HOOK "A" when separating the TENSION BAND Ass'y #.
10.Deassembly of the Capstan Motor (Fig. 3.14)
a. Separate the CAPSTAN MOTOR % after the removal of 3 screw $ holding the capstan motor. FIg. 3.15 Adjustment of the TENSION POLE POSITION
14
DEASSEMBLY AND REPLACEMENT (CONTINUED)
12. Deassembly of the REEL TABLE, IDLER PLATE TOTAL ASS'Y (Fig. 3.16)
a. Remove the POLY WASHER ! and separate the IDLER PLATE TOTAL Ass'y @ from the mainbase. b. Remove the REEL TABLE $ from the REEL TABLE POST # of the MAINBASE. CAUTION: · Take care not to deform the IDLER PLATE TOTAL Ass'y @ when assembling and deassembling.
13. Deassembly of the REEL BRKT TOTAL ASS'Y, CONNECT PLATE (Fig. 3.17)
a. Turn over the DECK MECHANISM and remove the 2 screw !. b. Remove the REEL BRKT TOTAL Ass'y @ from the MAINBASE. c. Separate the CONNECT PLATE # from the MAINBASE by pushing to the direction of the arrow. CAUTION: · In deassembly of the REEL BRKT TOTAL Ass'y, take care REEL BELT and REEL FELT not to be stained with Grease, Oil or Foreign substance. · Deassembly of the IDLER Ass'y should be precede the deassembly of the REEL BRKT TOTAL Ass'y. · Check the operation of the REEL BRKT TOTAL Ass'y before assembly. · Check the operation of FF/REW, PLAY, CUE and REVIEW work well and existence of noise during the mode operation.
FIg. 3.16 Deassembly of the REEL TABLE and the IDLER PLATE TOTAL ASS'Y
FIg. 3.17 Deassembly of the REEL BRKT TOTAL ASS'Y and the CONNECT PLATE
15
MECHANICAL ADJUSTMENT
1. Mechanical Adjustment (Fig. 4.1~4.4)
In case of deassembly and reassembly for fixing the mechanical problem, check the following check point. 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. b. Make sure that the ending part "A" of the RELAY LEVER assembled on the CONNECT PLATE is aligned with the reference hole "B" of the MAINBASE as shown in Fig. 4.2. c. The end point "A" of PINCH SPRINGPING of the LEVER TOTAL Ass'y should be located within the trajectory "B" of the CAM GEAR. (Fig. 4.3)
FIg. 4.2 Assembly reference between the RELAY LEVER and the CAM GEAR
FIg. 4.1 Assembly reference between the FL RACK and the CAM GEAR
FIg. 4.3 Assembly reference of the PINCH LEVER TOTAL ASS'Ywith the CAM GEAR
16
MECHANICAL ADJUSTMENT (CONTINUED)
d. Make sure that the triangular mark "A" of the L LOADING Ass'y is aligned with the mark "b" of the R LOADING Ass'y. (Fig. 4.4) e. Reference hole "C" of the LOADING RACK should be aligned with the reference hole of the R LOADING Ass'y to make the teeth of the LOADING RACK is aligned as shown in Fig. 4.4.
2. Adjustment and measurement of the BACK TENSION (Fig. 4.5, 4.6)
a. Check that the location of the TENSION POLE is in the right position. If not, adjust that by refering to the "4. Adjustment of the position of the TENSION POLE". b. Playback the T-120 Tape in S-MAX for 20 seconds. (Generally tape transporting section is settled down in 20 seconds) c. Measure the BACK TENSION by using the TENTELO METER. (Refer to Fig. 4.5) The result should be within the range of 20g~30g. d. If the BACK TENSION is out of the range, change the position of the TENSION SPRING of repeat the process of "4. Adjustment of the position of the TENSION POLE". (Fig. 4.6) CAUTION: · If the measurement result greater than the upper limit, change the hook point of the spring to the "A". · Confirm that all of the three probes of TENSION meter are in contact with the tape. · During measuring, 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.
FIg. 4.4 Assembly reference between the LOADING RACK and the LOADING LEVER ASS'Y
FIg. 4.5 Measurement of the BACK TENSION
17
MECHANICAL ADJUSTMENT (CONTINUED)
3. Mechanical Mode (Operate without a cassette tape)
a. Remove the FRONT LOADING Mechanism from the DECK Mechanism. b. Cap the IR LED and pull the FL RACK. This has the same effect with cassette loading to the deck. c. If the S/T POLE BASE is loaded, Play mode starts automatically. If you want other function, press the corresponding button. d. Turn off the poser when the Mechanism is in the desired position.
4. Adjustment of the position of the TENSION POLE (Fig. 4.6)
a. Place the Mechanical mode in the play mode. Refer to the above section "3. Mechanical mode". b. Confirm that the TENSION LEVER is aligned with the datum hole of the MAINBASE. c. If the requirement "b" is not satisfied, turn the BAND BRAKE ADJUST CAP clockwise or counterclockwise until the two datum holes alignes with each other.
FIg. 4.6 Adjustment of the TENSION POLE
18
ADJUSTMENT OF THE TPAE TRANSPORTING SECTION.
Generally, tape transporting section has been precisely adjusted in the factory and does not require the ordinary readjustment. But there is the case that tape noise or impact on the deck mechanise, tape transporting section readjustment is required, in adjustment of the tape tranmission section consut the following flow chart.
FIg.5.1 A schematic diagram of the tape transporting section
If any components shown in Fig. 5.1, tape transporting section will be changed. To readjust the change of tape transporting section, keep in mind and follow the following check points.
19
ADJUSTMENT OF THE TPAE TRANSPORTING 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. Refer to the following FLOW CHART in order to adjust the TAPE TRANSPORTING SYSTEM.
CLEANING
· DRUM TOTAL ASS'Y · A/C HEAD ASS'Y · PINCH LEVER TOTAL ASS'Y
S/T GUIDE ROLLER HEIGHT ADJUSTMENT
S/T GUIDE POST FLANGE
A/C HEAD AS ADJUSTMENT (TILT ADJUSTMENT)
AUDIO AZIMUTH ADJUSTMENT
A/C HEAD ADJUSTMENT
X-POSITION ADJUSTMENT
PLAYBACK PHASE ADJUSTMENT
LINEARITY ADJUSTMENT · S POLE BASE ASS'Y · T POLE BASE ASS'Y · TENSION LEVER ASS'Y
DRUM ENTRANCE/EXIT ENVELOPE FINE TUNING
REVIEW
PLAY CHANGING OPERATION CHECK
AUDIO OUTPUT CHECK (A/C HEAD TILT & HEIGHT ADJUSTMENT)
AUDIO AZIMUTH ADJUSTMENT
X-POSITION ADJUSTMENT
TRACKING Table.1 ADJUSTMENT FLOW DIAGRAM OF THE TAPE TRANSPORTING SYSTEM
20
ADJUSTMENT OF THE TPAE TRANSPORTING SECTION. (CONTINUED)
A. Adjustment of the S/T GUIDE ROLLER
a. Check the Playing back with a T-120 TAPE. b. Make sure that excessive tape wrinkle does not occure at eatch S.T GUIDE ROLLER. c. If tape wrinkle is observed at the S/T GUIDE ROLLER, turn the guide roller screw until there is not tape wrinkle.
D.Adjustment of the AUDIO AZIMUTH(Fig. 5.4)
a. Play back the ALIGNMENT TAPE (DN2 : SP, NTSC,7KHz) b. Check the AUDIO output with a AUDIO LEVEL METER. c. Turn the AC HEAD AZIMUTH SCREW @ until the maximum AUDIO output(-9dBm ~ -3dBm)is obtained.
B. Adjustment of the AC HEAD ASS'Y(TILT)
a. Play back a T-120 TAPE and check the running status of lower side of GUIDE POST. b. If there is any problem, Turn the AC HEAD TILT SCREW until the running status improved (Fig. 5.2)
FIg.5.4 Adjustment of AUDIO AZIMUTH, X-POSITION
E. Adjustment of the X-POSITION(Fig. 5.4 5.5)
a. Connect the PATH ADJ. FIXTURE to the PT01 on the MAIN CIRCUIT BOARD. b. Play back theALIGNMENT TAPE (DN2 : SP MONOSCOPE). c. Connect the S/W pin and ENVE pin of the PATH ADJ. FIXTURE with the SCOPE PROBE. d. Insert the adjustment bar in the AC HEAD ADJUST hole $ and adjust the X-POSITION of the AC HEAD ASS'Y until the ENVE is maximum when the VR is on the CENTER. * Three is the possibility that an another TRACKING CENTER can be occur when the AC HEAD ASS'Y turned completely in the counterclockwise direction, Hence adjust the X-position with AC HEAD ASS'Y adhering closely to the right side until the maximum ENVE is obtained. e. The adjustment of the X-POSITION finished, check if the AUDIO LEVEL is degraded, then readjustment of the AUDIO AZIMUTH is required.
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE VR CONTROL Adjustment AC HEAD ADJUST HOLE Test Point PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE ADJUSTMENT BAR
FIg.5.2 Adjustment of the AC HEAD ASS'Y
C.Adjustment of the AC HEAD Height(Fig. 5.3)
a. Play back T-120 TAPE. b. Make sure that the gap between the lower end of AC head is 0.25m. c. If the measurement of the gap is different from the reference value 0.25m, turn the screw !,# until the desired gap is obtained.
FIg.5.3 Adjustment of X-POSITION
21
ADJUSTMENT OF THE TPAE TRANSPORTING SECTION. (CONTINUED)
G.Adjustment of the LINEARITY(Fig. 5.7)
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE VR CONTROL Adjustment S/T GHIDE ROLLER Test Point PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE TAPE TRANSMISSON SECTION
a. Connect the PT01 on the MAIN CIRCUIT BOARD with a PATH ADJ.FIXTURE.
FIg.5.5 Adjustment of the X-POSITION
b. Play back an ALIGNMENT TAPE (DN-2 : MONOSCOPE Signal). c. Connect the FIXTURE S/W PULSE TEST PIN on the PATH ADJ. CHANNEL-1 SCOPE PROBE. d. Connect the VIDEO OUT on the MAIN CIRCUIT BOARD with a CHANNEL-2 SCOPE PROBE.(1V/div). e. Adjust the VR CONTROL on the ADJ. FIXTURE until the ENVELOPE signal is maximum while play back the ALIGNMENET TAPE. f. Adjust the S/T GUIDE ROLLER until the envelope signal waveforms of the entrance and exit sides are as shown in Fig. 5-7.
F. PLAYBACK PHASE ADJUSTMENT(Fig. 5.6)
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE Adjustment VR 595(PG SHIFTER) Test Point MAIN CIRCUTE BOARD MAIN CIRCUTE BOARD MAIN CIRCUTE BOARD
PHASE GENERATOR(PG) SHIFTER determine the VIDEO HEAD SWITCHING POINT when the TAPE is played back. If an adjustment of the PHASE GENERATOR(PG) SHIFTER is not doneprecisely, There can be a HEAD SWITCHING NOISE or a VERTICAL JITTER problem, vibration of the picture on the screen, not good quality of picture in special play back. a. Connect the PT01 on the MAIN CIRCUIT BOARD with a PATH ADJ. FIXTURE. b. Play back an ALIGNMENT TAPE (DN-2 : MONSCOPE). c. Connect the S/W PULSE TEST PIN on the PATH ADJ.FIXTURE with a CHANNEL-1 SCOPE PROBE. d. Connect the VIDEO OUT on the MAIN CIRCUIT BOARD with a CHANNEL-2 SCOPE PROBE(1V/div). e. Control thePG VOLUME until the time interval between the SWITCHING PULSE and the V-SYNC SIGNAL is sithin the 6.5±0.5H as shown in fig. 5.6
FIg.5.7 Adjustment of Linearity
Fig.5.6
22
ADJUSTMENT OF THE TPAE TRANSPORTING SECTION. (CONTINUED)
H.Adjustment of the wave form of DRUM Entrance / Exit (Fig. 5.8)
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE VR CONTROL Adjustment S/T GHIDE ROLLER Test Point PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE TAPE TRANSMISSON SECTION
e. f. g.
a. Connect the PT01 on the MAIN CIRCUIT BOARD with a PATH ADJ.FIXTURE. b. Play back an ALIGNMENT TAPE(DN-2 : MONOSCOPE signal) c. Connect the S/W PULSE TEST PIN on the PATH ADJ. FIXTURE with a CHANNEL-1 SCOPE PROBE. d. Connect the VIDEO OUT on the MAIN CIRCUIT BOARD with a CHANNEL-2 SCOPE PROBE(1V/div). e. Turn the VR CONTROL on the PATH ADJ.FIXTURE clockwise or counterclockwise until the signal shape of ENVELOPE has the constant thickness.(Fig.5.8) f. Adjust the S/T GUIDE ROLLER if the thickness of the ENVELOPE signal is not uniform.
h.
BOARD with a CHANNEL-2 SCOPE PROBE(1V/div). Make the VR CONTROL on the PATH ADJ.FIXTURE to the center to maximize the ENVELOPE signal. Play back the REVIEW MODE about 15 secong and alter the mode to PLAY MODE. Check whether the ENVELOPE waveform restore to its original form within 3 second when the REVIEW mode is changed to PLAY mode. If the requirement of "g" is not satisfied, Check the running status of tape on the lower part of T GUIDE POST and adjust the S/T GUIDE ROLLER precisely.
FIg.5.9 Waveform change when the mode altered (REVIEW £PLAY)
J. Checking for the J.AUDIO output waveform (Adjustment of AC HEAD TILT & Height)
Test Point AUDIO OUTPUT AUDIO OUTPUT JACK Measurement Equipment AUDIO LEVEL METER
FIg.5.8 Fine adjustment of the ENVELOPE at the DRUM ENTRANCE/EXIT
I. REVIEW
Test Point
PLAY(Fig. 5.9)
PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE TAPE TRANSMISSON SECTION
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE VR CONTROL Adjustment S/T GHIDE ROLLER
a. Connect the AUDIO output jack with an AUDIO LEVEL METER. b. Playback an Alignment Tape (DN-1:Color Bar 1KHz Signal) c. Check if the AUDIO output signal level is over -9~3dBm. d. If the requirement of "c" is not satisfied, readjust the AC HEAD TILT and the HEIGHT until the AUDIO output is maximized. (Fig. 5.2, 5.3)
a. Connect the PT01 on the MAIN CIRCUIT BOARD with a PATH ADJ.FIXTURE. b. Play back an ALIGNMENT TAPE(DN-2 : MONOSCOPE signal) c. Connect the S/W PULSE TEST PIN on the PATH ADJ.FIXTURE with a CHANNEL-1 SCOPE PROBE. d. Connect the VIDEO OUT on the MAIN CIRCUIT
23
ADJUSTMENT OF THE TPAE TRANSPORTING SECTION. (CONTINUED)
K.Adjustment of the AUDIO AZIMUTH
Test Point AUDIO OUTPUT AUDIO OUTPUT JACK Measurement Equipment AUDIO LEVEL METER
L. X-POSITION
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE VR CONTROL Adjustment S/T GHIDE ROLLER Test Point PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE TAPE TRANSMISSON SECTION
a. Connect the AUDIO output JACK with an AUDIO LEVEL METER. b. Play back the ALIGNMENT TAPE(DN-2:MONOSCOPE 7KHz Signal). c. Check if the AUDIO output signal level is over : -9 ~3dBm. d. If the requirement of "c" is not satisfied, readjust the AZIMUTH SCREW of the AC HEAD until the AUDIO output is maxized.(Fig. 5.4) e. Repeat the Process of "Adjustment of the wave form of DRUM Entrance/Exit"
a. Connect the PT01 on the MAIN CIRCUIT BOARD with a PATH ADJ.FIXTURE. b. Play back an ALIGNMENT TAPE(DN-2: MONOSCOPE Signal). c. Connect theS/W PULSE TEST PIN on the PATH ADJ.FIXTURE with a CHANNEL-1 SCOPE PROBE. d. Connect the VIDEO OUT on the MAIN CIRCUIT BOARD with a CHANNEL-2 SCOPE PROBE(1V/div) e. Check if the ENVELOPE is maximum when the VR CONTROL on the PATH ADJ. FIXTURE is in CENTER. f. If the requirement "e" is not satisfied, readjust the XPOSITION by referring to subitem "E"(Adjustment of the X-POSITION). g. Repeat the process of subite, "F(PLAYBACK PHASE ADJUSTMENT).
24
EXPLODED VIEW AND PARTS LIST
1. Exploded view of DECK Ass'y ( Top View)
fig1-2
fig6-1
25
EXPLODED VIEW AND PARTS LIST (CONTINUED)
2. Exploded view of DECK Ass'y ( Bottom View)
fig6-1
fig6-2
26
EXPLODED VIEW AND PARTS LIST (CONTINUED)
3. Exploded view of FL Ass'y
fig6-3
27
EXPLODED VIEW AND PARTS LIST (CONTINUED)
4. Exploded view Drum Total Ass'y
D0040
D0020
D0040
D0050
D0010
D0060
D0070
fig6-4
28
EXPLODED VIEW AND PARTS LIST (CONTINUED)
5. Parts List of Deck Total Ass'y (continud)
LOC NTSC M1OOO 97PCO273DM1OOO 97PC0195DM1OOO 97PC0194DM1OOO 97PC0128DM1OOO 97PC0301DM1OOO 97PC0328DM1OOO 97PC0352DM1OOO 97PC0300DM1OOO 97PC0329DM1OOO 97PC0353DM1OOO 97PC0361DM1OOO 97PC0299DM1OOO 97PC0330DM1OOO 97PC0354DM1OOO 97PC0360DM1OOO 97PC0365DM1OOO 97PC0364DM1OOO 97PC0359DPAL M1OOO 97PC0363DM1OOO 97PC0362DSECOM DECK TOTAL AS DECK TOTAL AS DRP8421(4HD MONO,DLC,HEAD CLNER) DRP8621(4HD HI-FI,DLC,HEAD CLNER) DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DECK TOTAL AS DRN-8329-CAR(2HD SP/EP HI-FI,DLC) DRN-8230(2HD SP/EP MONO,DLC) DRN-8430(4HD MONO, DLC) DRN-8630(4HD HI-FI, DLC) DRN-8200(2HD SP/EP MONO,NON) DRN-8201(2HD SP/EP MONO,NON,HEAD CLNER) DRN-8220(2HD SP/EP MONO,DLC) DRN-8400(4HD MONO, NON) DRN-8401(4HD MONO, NON,HEAD CLNER) DRN-8420(4HD MONO, DLC) DRN-8421(4HD MONO, DLC,HEAD CLNER) DRN-8600(4HD HI-FI,NON) DRN-8601(4HD HI-FI,NON, HEAD CLNER) DRN-8620(4HD HI-FI,DLC) DRN-8621(4HD HI-FI,DLC,HEAD CLNER) DRN-8230-H(2HD SP/EP, MONO,DLC) DRN-8430-H(4HD MONO,DLC) DRN-8630-H(4HD HI-FI,DLC) PART S/N PART NAME PART DISCRIPTION
29
EXPLODED VIEW AND PARTS LIST (CONTINUED)
Parts List of Deck Total Ass'y (continud)
LOC DRUM AS D0010 D0030 D0030 D0040 D0050 D0060 D0070 D0070 D0070 AD002 DECK AS AM001 A0100 A0200 A0300 A0400 A0400 A0500 A0600 A0600 A0700 A0800 A0900 A1000 A1100 A1200 A1300 A1400 A1500 A1600 97SA318100 97SA316500 97SA316600 97S8101600 97S8101600 97S3102000 97SA320500 97SA326800 7051300611 97SA316800 97SA316900 97S2709500 7008301911 97S0904300 97SA319400 7274300611 97S5500400 97S2623200 DECK AS MAIN BASE AS S SLANT POLE AS T SLANT POLE AS MOTOR CAPSTAN MOTOR CAPSTAN SCREW TAPPTITE AC HEAD AS AC HEAD AS SCREW MACHINE L LOADING AS R LOADING AS RACK LOADING SCREW MACHINE PLATE CONNECT REEL BRKT TOTAL AS SCREW TAPPTITE BELT REEL LEVER RELAY REFERRING TO LIST OF DECK TOTAL ASS'Y T-MECHA T-MECHA T-MECHA DMVCMC07DR NEW SANVIC TT2 BIN-P 2.6X7 MFZN HVMXB1000AK HVMXA1101A PAN 3X6 SW MFZN T-MECHA T-MECHA SECC T1.2 WAS M3*19 MFZN SECC T0.8 T-MECHA TT3 RND 3X6 MFZN CR68 SECC T1.2 97SA324400 97SA327100 7001260711 97SA320400 97S2303600 97S2303700 97S2303800 97S2303900 7051300611 DRUM AS DRUM M/T AS DRUM M/T AS SCREW MACHINE EARTH GROUND AS HOLDER MAIN HOLDER CAP(A) HOLDER CAP(B) HOLDER CAP(C) SCREW MACHINE REFERRING TO LIST OF DRUM PRICE ASS'Y E20XL-25 DMVDMTO4M PAN 2.6X7 MFZN T-DRUM POM(KEPITAL F20) POM(2CH) POM(4CH) POM(6CH) PAN 3X6 SW MFZN PART S/N PART NAME PART DISCRIPTION
30
EXPLODED VIEW AND PARTS LIST (CONTINUED)
Parts List of Deck Total Ass'y
LOC DECK AS A1700 A1800 A1900 A2000 A2100 A2200 A2300 A2400 A2500 A2600 A2700 A2800 A2800 A2900 F/L AS AF001 AF002 A3000 A3100 A3200 A3300 A3400 A3500 A3600 A3700 A3800 A3900 A4000 A4100 A4200 A4300 AN002 97SA261010 7274300611 97S0903910 97S2401400 97S2401500 7274300611 97S3008800 97S2622700 97S3117300 97SA415400 97S3008900 97S2621600 97S2621700 97S3009000 97S2621800 97SA317800 2291131304 F/LOADING AS SCREW TAPPTITE PLATE TOP BRKT FL L BRKT FL R SCREW TAPPTITE SPRING FL LIFT
LEVER DOOR OPENER
PART S/N
PART NAME
PART DISCRIPTION
97S2709600 97S2708200 97SA317100 97SA318010 7274300611 97SA317300 97S3108200 97S2909400 97SA317200 97SA317400 97SA317500 97S8015000 97S8023100 7274300811
RACK FL GEAR CAM
PINCH LEVER TOT AS
PBT(DY4410GF) NATURAL DERLIN 100 T-MECHA T-MECHA TT3 RND 3X6 MFZN T-MECHA D2.6XD6.0XT0.5 POM(F20-03) BLACK T-MECHA T-MECHA T-MECHA HVFHU0030AK MH-131DT TT3 RND 3X8 MFZN
LC BRKT AS SCREW TAPPTITE
IDLER PLATE TOT AS
POLYWASHER TABLE REEL TENSION LVR TOT AS S BRAKE AS T BRAKE AS HEAD FE HEAD FE SCREW TAPPTITE
T-MECHA TT3 RND 3X6 MFZN SECC T1.0 SECC T1.0 SECC T1.0 TT3 RND 3X6 MFZN SWPB D0.8 POM(F20-03) BLACK D3.6XD8XT0.5 T-MECHA SUS304 WPB D0.5 SECC T1.0 SECC T1.0 SUS304 WPB D0.25 POM(F20-03) NATURAL T-MECHA DELUXE 5221G(NAM-YOUNG)
WASHER POLY
CST HOLDER SUB AS
SPRING SAFETY LVR LEVER SAFETY L LEVER SAFETY R
SPRING RELEASE LVR
LEVER RELEASE F/L LEVER AS GREASE
HEAD CLEANER AS A4400 97SA326900 HEAD CLEANER AS T-MECHA
31
EXPLODED VIEW AND PARTS LIST (CONTINUED)
6. Parts List of Drum Price Ass'y
LOC NTSC AD001 AD001 AD001 AD001 AD001 AD001 AD001 AD001 AD001 AD001 PAL AD001 AD001 AD001 AD001 AD001 AD001 AD001 AD001 SECAM AD001 AD001 AD001 AD001 97PA266171 97PA270201 97PA272971 97PA272801 DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS CYS-KT412(4HD MONO DLC) CYS-KT410(4HD MONO NON) CYS-KT612(4HD HI-FI DLC) CYS-KT610(4HD HI-FI NON) 97PA265871 97PA269901 97PA265971 97PA270001 97PA266071 97PA270101 97PA272771 97PA272601 DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS CYP-KT112(2HD SP ONLY DLC) CYP-KT110(2HD SP ONLY NON) CYP-KT212(2HD SP/LP DLC) CYP-KT210(2HD SP/LP NON) CYP-KT412(4HD MONO DLC) CYP-KT410(4HD MONO NON) CYP-KT612(4HD HI-FI DLC) CYP-KT610(4HD HI-FI NON) 97PA268901 97PA277471 97PA264841 97PA269001 97PA277571 97PA264941 97PA269101 97PA277671 97PA265041 97PA272071 DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS CYN-T210(2HD SP/EP NON) CYN-T212(2HD SP/EP DLC) CYN-T213(2HD SP/EP BLK) CYN-T410(4HD MONO NON) CYN-T412(4HD MONO DLC) CYN-T413(4HD MONO BLK) CYN-T610(4HD HI-FI NON) CYN-T612(4HD HI-FI DLC) CYN-T613(4HD HI-FI BLK) CYN-T312(4HD HI-FI NON) PART S/N PART NAME PART DISCRIPTION
32
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 : [email protected] TEL : 82-2-360-7802 FAX : 82-2-360-7877