Text preview for : FM serie VCR.pdf part of Daewoo FM Mecha Technical Service Guide, Vcr Mechanism Unit - (8.183Kb) Part 1/3 - pag. 52
Back to : vcr_mechanism_®_.part1.ra | Home
Technical Service Guide
VCR MECHANISM UNIT (FM-MECHA)
CONTENTS
1. DESCRIPTION OF THE MECHANISM
1. CHARACTERSTIC OF THE FM-DECK MECHANISM........................................................................................................2 2. DESCRIPTION OF THE MODE ............................................................................................................................................3 3. FM DECK TIMING CHART.................................................................................................................................................12 4. WIRING DIAGRAM .............................................................................................................................................................13
2. ARRANGEMENT AND CHECK FOR THE MAJOR PARTS
1. PARTS LOCATION .............................................................................................................................................................15 2. PERIODIC MAINTENANCE AND SERVICE SCHEDULE .................................................................................................18 3. JIGS AND TOOLS...............................................................................................................................................................20
3. DISASSEMBLY AND EXCHANGE
1. MECHANICAL CHECKS ....................................................................................................................................................22 2. REPLACEMENT OF THE DRUM TOTAL ASS'Y...............................................................................................................23 3. REPLACEMENT OF THE S, T SLANT POLE ASS'Y.........................................................................................................24 4. REPLACEMENT OF THE PINCH LEVER TOTAL ASS'Y..................................................................................................25 5. REPLACEMENT OF THE A/C HEAD TOTAL ASS'Y.........................................................................................................25 6. REPLACEMENT OF THE L/C BRKT ASS'Y......................................................................................................................26 7. REPLACEMENT OF THE MAIN PLATE.............................................................................................................................27 8. REPLACEMENT OF THE CAM GEAR, RELAY PLATE, F/L RACK..................................................................................28 9. REPLACEMENT OF THE TENSION LEVER ASS'Y ..........................................................................................................29 10. REPLACEMENT OF THE CAPSTAN MOTOR ................................................................................................................30
4. MECHANICAL ADJUSTMENT
1. CHECK FOR THE MECHANICAL POSITION....................................................................................................................31 2. HOW TO SET MECHANICAL MODE.................................................................................................................................34 3. MEASUREMENT OF PRESSING FORCE FOR PINCH ROLLER ....................................................................................34 4. ADJUSTMENT OF TENSION POLE POSITION................................................................................................................35 5. MEASUREMENT OF THE BACK TENTION ......................................................................................................................35
5. THE ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM
1. THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM ..............................................................................36 2. ADJUSTMENT FLOW.........................................................................................................................................................37 3. ADJUSTMENT PROCEDURES..........................................................................................................................................38
6. EXPLODED VIEW & PARTS LIST
1. EXPLODED VIEW OF DECK ASS'Y ..................................................................................................................................45 2. PARTS LIST OF DECK ASS'Y ...........................................................................................................................................46 3. EXPLODED VIEW OF F/L ASS'Y .......................................................................................................................................48 4. PARTS LIST OF F/L ASS'Y ................................................................................................................................................49 5. MAIN SPARE PARTS LIST OF DECK ASS'Y....................................................................................................................50 SERVICE NOTICE ...................................................................................................................................................................52
1
1. DESCRIPTION OF THE MECHANISM
1. CHARACTERISTIC OF THE FM-DECK MECHANISM
1) FM-MECHA DECK follows the VHS standard and PAL standard. 2) FM-MECHA DECK has 3 motors (DRUM MOTOR, CAPSTAN MOTOR and L/C MOTOR). 3) FM-MECHA DECK uses L/C MOTOR to drive FRONT LOADING. 4) FM-MECHA DECK has 7 MODES (EJECT/INITIAL/IDLE/REV/SLOW/PLAY/FF & REW) and each mode is composed of 4 bit mode Signals and realized by the mode switch which is driven by the L/C MOTOR. 5) FM-MECHA uses the FULL LOADING system in which mode shifting time (especially, picture appearing time) is short. 6) FM-MECHA DECK is removed the DECK PCB and connected to MAIN PCB by using the B to B TYPE CONNECTOR.
2
2. DESCRIPTION OF THE MODE
1) EJECT MODE A. In this mode, the cassette In/Out operation is performed by the CW/CCW rotation of the L/C motor to which the Front Loading driving parts are directly related. · CASSETTE IN : If the cassette is inserted into the entrance with proper insertion force, Mode Switch is rotated by insertion force and break from Eject mode. At the same time the Cassette In is detected. And instantely the cassette loading is performed and the L/C motor proceeds to the PLAY/STOP mode. · CASSETTE OUT: In this state the Cassette Holder is located at the enterance of the front panel, and only the Cassette In operation can be excuted. B. Mechanical Arrangement a. The BAND BRAKE is released from the S REEL TABLE. b. The S & T MAIN BRAKE is released from the S & T REEL TABLE. c. The S & T SUB BRAKE is released from the S & T REEL TABLE. d. The IDLER GEAR is separated from the S & T REEL TABLE.
EJECT MODE
3
2) INITIAL MODE A. This mode is used as a reference mode for unloading location when power is off. B. Mechanical Arrangement a. The BAND BRAKE is released from the S REEL TABLE. b. The S MAIN BRAKE is released from the S REEL TABLE. c. The T MAIN BRAKE is applied to the T REEL TABLE. d. The S & T BRAKE is released from the S & T REEL TABLE.
INITIAL MODE
4
3) LOADING SECTION A. LOADING SECTION is used to lead a tape to either transporting situation or initial situation by forwarding and backwarding of POLE BASE AS. B. Mechanical Arrangement a. The BAND BRAKE is released from the S REEL TABLE. b. The S & T MAIN BRAKE is released from the S & T REEL TABLE. c. The S & T SUB BRAKE is applied to the S & T REEL TABLE. d. The IDLE GEAR is separated from the S & T REEL TABLE.
LOADING MODE
5
4) IDLE MODE A. Idle mode is used to reduce the tape tension and load in drum and posts which are used for tape transportation by seperating PINCH ROLLER from CAPSTAN SHAFT when DECK is performed from forward tape running to backward tape running or from backward tape running to forward tape running. B. Mechanical Arrangement a. The S & T MAIN BRAKE is released from the S & T REEL TABLE. b. The S & T SUB BRAKE is applied to the S & T REEL TABLE. C. The PINCH ROLLER is separated from the CAPSTAN SHAFT.
IDLE MODE
6
5) REVIEW MODE A. The Review Search operation is performed in this mode. This mode is obtained by pressing the REW button in the state of playing. The L/C motor rotated until the Cam switch detects the REVIEW mode. When the Cam switch detects the REVIEW mode, the L/C motor is stopped and at the nearly time the Capstan starts to rotate CCW to transport the tape reversely. B. Mechanical Arrangement a. The BAND BRAKE is released from the S REEL TABLE. b. The S & T MAIN BRAKE are released from the S & T REEL TABLE. c. The S SUB BRAKE is applied to the S REEL TABLE. d. The PINCH ROLLER is applied to the CAPSTAN SHAFT to transport the tape reversely. e. The REVIEW ARM is moved forward to perform the role of the tape transporting POST.
REVIEW MODE
7
6) SLOW MODE A. This mode is performed the forward and backward slow searching. B. Mechanical Arrangement a. The BAND BRAKE is applied to the S REEL TABLE. b. The S & T MAIN BRAKE is released from the S & T REEL BRAKE. c. The S & T SUB BRAKE is released from the S & T REEL TABLE. d. The REVIEW ARM is located at the initial position. e. The CAPSTAN BRAKE is applied to the CAPSTAN MOTOR.
F/R SLOW MODE
8
7) PLAY/RECORD/STOP MODE A. The PLAY/RECORD/STOP mode transport the tape from the S REEL TABLE to the T REEL TABLE in the regular speed to perform the recording and playback. Also this mode is to STAND-BY the next operation of key-in. B. Mechanical Arrangement a. The TENTION POLE is located at the appointed position. b. The BAND BRAKE is applied to the S REEL TABLE for excute the tape tension servo. c. The S & T MAIN BRAKE ans S & T SUB BRAKE is released from the S & T REEL TABLE. d. The PINCH ROLLER is applied to the CAPSTAN MOTOR.
PLAY MODE
9
8) BRAKE MODE A. This mode is a mechanical mode which lies in between PLAY mode and FF/REW mode. If EJECT, STOP or PLAY button is pressed in the FF/REW mode, S & T MAIN BRAKES are applied to the S & T REEL TABLE quickly. So, It can be prevented to loosen of the tape. B. Mechanical Arrangement a. The BAND BRAKE is released from the S REEL TABLE. b. The S & T MAIN BRAKE are applied to the S & T REEL TABLE. c. The S & T SUB BRAKE are released from the S & T REEL TABLE. d. The PINCH ROLLER is released from the CAPSTAN SHAFT.
BRAKE MODE
10
9) FF/REW MODE A. In this mode, the cassette tape is rewound to the S & T REEL Table at the high speed by the CW/CCW rotation of the Capstan Motor which is directly releated to the S & T REEL Table. If the START/END SENSOR is on during this operation, it returns to the STOP MODE and excutes CUE/REV. During the FF/REW operation, the Drum continues to rotate with the tape wrapped around it and the tape is contacted to the CONTROL HEAD that reads the VISS signal. B. Mechanical Arrangement a. The BAND BRAKE and the S & T MAIN BRAKE are released from the S & T REEL TABLE. b. The PINCH ROLLER is separated from the CAPSTAN SHAFT.
FF/REW MODE
11
MODE 105 MODE 0 100 110 5 70 2 CAM ANGLE F/L RACK 34.1 80 75
(LOADING)
(BRAKE)
210
220
230
240
260
270
280
290
335 18.25 19.9 22.5
23.6 13.7
26.6 25.3
RELAY CAM 10.4
8
9.7
MAIN PLATE 23.92 13.3 0 REEL DRIVE S MAIN BRAKE T MAIN BRAKE L L L L L L L REV ARM ........... S SUB BRAKE T SUB BRAKE CAP. BRAKE PINCH DIRECT .............................................. . 3.97 5.6 SLIP
27.77
33.83
36.4
3. FM DECK TIMING CHART
................................................ ................................................................................................... ................................................ ................................................................................................... ...........
....................... ................................................. ............ ...........................
12
43.4 40.37
345
340 FF/REW 265 SLOW 215 IDLE 235 REV
285
PLAY /STOP
INITIAL
EJECT
4. WIRING DIAGRAM
1) WIRE DIAGRAM
CN-C1 CN-A
CN-C2
DRUM MOTOR CAM SW CN-B L/C MOTOR
FE HEAD
ACE HEAD
CAPSTAN MOTOR
END SENSOR (MAIN PCB)
LED (MAIN PCB)
START SENSOR (MAIN PCB) REEL SENSOR (MAIN PCB)
REEL SENSOR (MAIN PCB)
SWITCH DETECTOR (MAIN PCB)
13
2) CONNECTOR PIN ARRANGEMENT CN-A (2 HEAD MONO: ELCO) 1 2 3 4 VR 1 COMMON VL 1 GND CN-C1 (TAICO) 1 2 3 4 5 CN B (JAE) 1 2 FE HEAD GND 6 7 8 9 10 11 12 13 14 15 16 17 18 DRUM FG DRUM M/T GND DRUM PG DRUM SPP CTL DRUM M/T 12V CAM A CAM B CAM C CAM D LM (+) LM (--) A/E HEAD AUDIO GND AUDIO HEAD AUDIO HEAD CTL HEAD (--) CTL HEAD (+) CAP CTL REF CN-2 (TAICO) 1 2 3 4 5 6 7 8 CAPSTAN I LM. CONTROL CAP IC GND CAP M/T GND CAPSTAN F/R CAPSTAN FG EVER 5V CAP M/T 12V
14
2. ARRANGEMENT AND CHECK FOR THE MAJOR PARTS
1. PARTS LOCATION
1) PARTS LOCATION OF DECK ASS?Y A. TOP VIEW
15
B. BOTTOM VIEW
16
2) PARTS LOCATION OF FRONT LOADING ASS?Y A. TOP VIEW
B. FRONT VIEW
17
2. 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 mechanism and tapes, we strongly urge you to perform the periodic maintenance and inspection as described below. After repairing, do the maintenance as 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 slowly revolving the rotating HEAD DRUM Ass'y by hand (Do not rotate it by applying the electric power to the motor for cleaning). Do not move the cleaning cloth in the vertical direction against the heat-tip. C. Cleaning of the tape transporting section Cleaning the tape transporting parts with a cleaning cloth soaked in the alcohol. D. Cleaning of driving section Cleaning the driving section with the cloth soaked in the alcohol. E. Routine inspection Perform the maintenance and inspection as separately described depending on the period of time in use. 2) CLEANING AND LUBRICATION A. Cleaning of Tape Transporting System a. Cleaning of Tape Tranporting System Following parts should be cleaned 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 Since the above parts contact with video tape, they tend to collect dust particles if they are stained with dust or foreign substance it have a bad effect on the picture and lead to demage of the tape. After cleaning with alcohol, allow the parts to dry thoroughly before using a cassette tape. b. Cleaning of driving system · REEL TABLE · T MAIN BRAKE ·CAPSTAN FLYWHEEL/PULLEY · S MAIN BRAKE · T SUB BRAKE · REEL PULLEY B. LUBRICATION · S REEL TABLE POST · T REEL TABLE POST ·IDLER POST After cleaning components with alcohol, lubricate these with one or two drops oil.
18
3) SERVICE SCHEDULE FOR THE MAJOR PARTS Following parts should be receive perodic service according to the recommended intervals. NAME PERIODIC SERVICE (TIME) 1000 DRUM TOTAL ASS'Y CAPSTAN MOTOR L/C BRKT ASS'Y REEL BELT IDLER PLATE TOTAL ASS'Y REEL TABLE T SUB BRAKE ASS'Y BAND BRAKE ASS'Y S MAIN BRAKE ASS'Y T MAIN BRAKE ASS'Y PINCH ROLLER ASS'Y AC HEAD ASS'Y FE HEAD REEL GEAR TOTAL ASS'Y N Check and Replace if necessary : O: Replace N O O O O O N O O O N 2000 O O O O N O O O O O N 3000 N 4000 O O O O O 5000 N
Note: Even though the unit is not used frequently, cleaning, lubrication and replacement of the belt should be undertaken every 2 years.
19
3. JIGS AND TOOLS
1) LIST OF JIGS AND TOOLS
NO 1
ITEMS ALIGNMENT TAPE
MODEL PAL: SP MONOSCOPE 6 KHz SP COLOR BAR 1KHz (LP MONOSCOPE) DHC-602V
FIG. NO !
REMARKS CHECKING OF THE TAPE TRANSPORTING SYSTEM
2
CLEANING TAPE
@
CLEANING OF THE TAPE TRANSPORTING SYSTEM MEASUREMENT OF REEL TORQUE MEASUREMENT OF REEL TABLE 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
CASSETTE TAPE (KOKUSAI) VHS SPINDLE HEIGHT GAUGE TENTELO METER (TENTELO) FAN TYPE TENSION METER
KT-300NV KT-300RV TSH-V4
#
4
$
5
T2-H7-UM
%
6
BELOW 3KG
^
7
DENTAL MIRROR
&
8
+ DRIVER DRIVER ADJUSTMENT DRIVER SERVICE JIG S/N: 97PD103500
* -1 * -2 * -3 (
9
CHECK OF THE DECK MECHANISM OPERATION
20
2) SKETCH OF JIGS AND TOOLS
1
2
ALI GN ME NT
TAP E
CLE ANI NG TAP E
3
4
20
20
10
VHS SPINDLE HEIGHT GAGE
10
0
10
20
5
6
7
9
8
8-1
8-2
8-3
21
30
0
30
20
30
10
30
3. DISASSEMBLY AND REPLACEMENT
CAUTION : The DECK MECHANISM can be removed only in the EJECT mode. (See 1. DISASSEMBLY OF THE DECK TOTAL ASS?Y AND F/L ASS?Y Fig. 3-1) 1) Remove the top cover and front panel, BRKT F/L, BRKT DECK. 2) Separate the Drum FPC ! and F/E HEAD CONNECTOR @ . 3) Remove the 3 screws # and disassemble the DECK $ . 4) Remove the 2 screws % from the F/L ASS?Y. 5) Remove F/L ASS?Y from the Hook which is formed in the Main Base by pushing it while pulling the upper part of F/L ASS?Y^ . NOTE: · Please be careful not to bend or deform the Hooks formed in the MAIN BASE and Claws in the F/L Ass?y.
Fig. 3-1
22
2. REPLACEMENT OF THE DRUM TOTAL ASS?Y(See Fig. 3-2)
1) Turn over the DECK ASS?Y. 2) Separate the L/C-DRUM CONN. AS @ from the DRUM PCB ! . 3) Turn over the DECK ASS?Y again and remove the 3 screws# and remove the DRUM TOTAL ASS?Y$ . 4) After changing new DRUM ASS?Y please assemble it in the reverse order. 5) After completing this procedure, check and confirm the state of tape running and adjust the tape transporting system (Refer to SEC. 5) if necessary. NOTE: · Avoid damaging the HEAD or getting the HEAD dirty. · If playback picture is poor, try cleaning the HEAD and checking the connectors before replacing DRUM ASS?Y. · Don?t replace only upper Drum for Service. · Please replace Drum Total Ass?y.
Fig. 3-2
23
3. REPLACEMENT OF THE S, T SLANT POLE ASS?Y(See Fig. 3-3)
1) Remove the DRUM TOTAL ASS?Y according to the method of the SEC. 3-2. 2) Remove the 2 screws ! and the LOADING GUIDE PLATE @ . 3) Remove the R & L LOADING GEAR ASS?Y# , $ . 4) Remove the S & T SLANT POLE ASS?Y% , ^ after moving them to the point "A" by pulling them in the direction of the arrow ¨O. 5) After changing new SLANT POLE ASS?Y please assemble it in the reverse order. 6) Be careful not to get grease on the GUIDE ROLLER.
Fig. 3-3
24
4. REPLACEMENT OF THE PINCH LEVER TOTAL ASS? Y(See Fig. 3-4)
1) Unhook the PINCH SPRING HOOK @ which is hanging on the L/C BRKT ASS?Y! . 2) After removing the POLY WASHER # disassemble the PINCH LEVER TOTAL ASS?Y$ . 3) After changing new PINCH LEVER TOTAL ASS?Y, assemble it in reverse order. NOTE: · Pay attention to be located the BOSS of the PINCH LEVER ASS?Y to the outside of the CAM. (See Fig. 4-2) · Pay attention to avoid staining with grease or oil on the outside of the PINCH ROLLER.
5. REPLACEMENT OF THE A/C HEAD TOTAL ASS?Y(See Fig. 3-4)
1) After removing the 2 screws % from the A/C HEAD TOTAL ASS?Y, remove the A/C HEAD TOTAL ASS?Y . ^ 2) After changing new A/C HEAD TOTAL ASS?Y, please assemble it in the reverse order. 3) After changing it, please re-adjust the tape transporting system and audio bios. (Refer to SEC. 5)
Fig. 3-4
25
6. REPLACEMENT OF THE L/C BRKT ASS?Y(See Fig. 3-5)
1) Turn over the DECK. 2) Separate the CAPSTAN EFC ! from the CONNECTOR of the L/C BRKT ASS?Y$ . 3) Separate the L/C-DRUM CONN. AS @ from the CONNECTOR of the DRUM ASS?Y. 4) Return the DECK over. 5) After removing the 3 screws # from the L/C BRKT ASS?Y. 6) After changing to the new L/C BRKT ASS?Y, reassemble the above-mentioned parts in the reverse order. 7) Pay attention to the assembly datum position, when reassembling the MODE SWITCH. (Refer to Fig. 4-2)
Fig. 3-5
26
7. REPLACEMENT OF THE MAIN PLATE (See Fig. 3-6)
1) After turning over the deck, separate RELAY SPRING @ from the MAIN PLATE ! . 2) After removing the one screw # , disassemble the RELAY GEAR $ . 3) After removing the REEL BELT % , remove the POLY WASHER ^ . 4) Remove the REEL DRIVE TOTAL ASS?Y& and CLUTCH LEVER * . 5) Push the MAIN PLATE to left side and remove it. NOTE: · When removing the MAIN PLATE in the state that the F/L RACK is assembled, pay attention to avoid the transformation of the MAIN PLATE by interfering of each other. · When reassemblying, pay attention to the assembly position of the MAIN PLATE and RELAY GEAR. (See Fig. 4-3) · Before assemblying the REEL DRIVE TOTAL ASS?Y, make sure of the state of POLY SLIDER on the REEL DIRVE POST. · When assemblying or disassemblying, pay attention to avoid touching oil or glease on the REEL BELT.
Fig. 3-6
27
8. REPLACEMENT OF THE CAM GEAR, RELAY PLATE, F/L RACK (See Fig. 3-7)
1) Remove the RELAY GEAR according to the SEC. 3-7. 2) Remove the PINCH LEVER TOTAL ASS?Y and L/C BRAKT ASS?Y according to SEC. 3-4 and 3-7. 3) Remove the CAM GEAR ! . 4) Remove the RETURN LEVER @ . 5) Slide the RELAY PLATE % until the HOLE # formed in RELAY PLATE meets the PINCH POST $ and disassemble the RELAY PLATE. 6) Slide the F/L RACK ^ in the direction of arrow and then remove the F/L RACK backward. 7) After changing new components, assemble it in reverse order. 8) Pay attention to the location of assembling when re-assemble. (See Fig. 4-1)
Fig. 3-7
28
9. REPLACEMENT OF THE TENSION LEVER ASS?Y(See Fig. 3-8)
1) Separate the TENSION SPRING @ from the HOOK "A" of the MAIN BASE ! . 2) Remove the BAND BRAKE CAP # by means of lift with proper force. 3) Disassemble the TENSION LEVER ASS?Y$ in the state of pulling back the HOOK "B". 4) Remove the BAND BRAKE ASS?Y% from the TENSION LEVER ASS?Y while rotating in the direcction of the arrow. 5) Re-assemble in the reverse order. 6) After re-assembling it, adjust the position of the TENSION POLE. (See SEC. 4-4) 7) If necessary, adjust and measure the BACK TENSION (See SEC. 4-5). 8) Avoid getting grease or oil on the FELT of the BAND BRAKE ASS?Y. Also avoid damaging the HOOK "B".
Fig. 3-8
29
10. REPLACEMENT OF THE CAPSTAN MOTOR (See Fig. 3-9)
1) After turning over the DECK ASS?Y, separate the CAPSTAN FFC! from the CONNECTOR @ . 2) Disassemle the REEL BELT # . 3) Separate the CAPSTAN BRAKE SPRING $ from the HOOK "A". 4) Disassemble the CAPSTAN BRAKE ASS?Y% in the state of pulling back the HOOK "B". 5) After turning over the DECK ASS?Y again, separate the REVIEW ARM SPRING^ from the HOOK "C". 6) After removing the POLY WASHER & , disassemble REVIEW ARM ASS?Y* . 7) After removing the 3 screws ( from the CAPSTAN MOTOR, disassemble the CAPSTAN MOTOR ) .
Fig. 3-9
30
4. MECHANICAL ADJUSTMENTS
1. MECHANICAL CHECKS
If irregular operation occurs or when reassembling a part, please check the following. 1) Make sure that the datum hole of the RELAY PLATE meets that of the MAIN BASE in the Eject Mode as shown in Fig. 4-1. 2) Make sure that the datum hole of the CAM GEAR meets that of the MAIN BASE in the Eject Mode as shown in Fig. 4-1. 3) There are two triangle mark in the MODE SWITCH. When installing the L/C BRKT ASS'Y, make sure that the one marks meets the other in the Eject Mode as shown in Fig. 4-2. 4) Make sure the that the BOSS of the PINCH LEVER ASS'Y is located outside of the CAM of the CAM GEAR in the Eject Mode as shown in Fig. 4-2. 5) Make sure that the datum hole of the MAIN PLATE meets that of the MAIN BASE in the Eject Mode as shown in Fig. 43. 6) When installing the RELAY GEAR, make sure that the triangle mark meets the last groove of the teeth of the MAIN PLATE in the Eject Mode as shown in Fig. 4-3. 7) Make Sure that the triangle mark of the L LOADING GEAR ASS'Y meets the -Shaped mark of the R LOADING GEAR ASS'Y in the Eject Mode as shown in Fig. 4-4. 8) Make sure that the 1'st tooth of the R LOADING GEAR ASS'Y meets the 1'st groove of the LOADING GEAR ASS'Y in the Eject Mode as shown in Fig. 4-4.
31
Fig. 4-1 DATUM POSITION OF RELAY PLATE & CAM GEAR
Fig. 4-2 DATUM POSITION OF L/C BRKT AS & PINCH LEVER AS
32
Fig. 4-3 DATUM POSITION OF MAIN PLATE & RELAY GEAR
Fig. 4-4 DATUM POSITION OF LOADING GEAR ASS?Y & LOAD RELAY GEAR
33
2. HOW TO SET MECHANICAL MODE
1) With the F/L ASS?Y removed, turn on the POWER. 2) If rotate the WORM PULLEY 2 or 3 times manually, it will start loading and move to PLAY/STOP mode. 3) Press the desired button. 4) On performing the desired mode, pull out the power plug from the outlet. 5) Assemble and disassemble the F/L ASS?Y in the only EJECT mode.
3. MEASUREMENT OF PRESSING FORCE FOR PINCH ROLLER
1) In the state of loading the cassette tape, playback the tape by pressing the PLAY button. 2) After hanging the PUSH-PULL GUAGE on the HOOK of PINCH LEVER TOTAL AS, pulling it to the direction of A indicated by the arrow as shown Fig. 4-5. 3) The very moment tape stop, read the scale of PUSH-PULL GUAGE. (SPEC: 1.1±0.2 kg).
Fig. 4-5 MEASUREMENT OF PRESSING FORCE FOR PINCH ROLLER
34
4. ADJUSTMENT OF TENSION POLE POSITION
1) Turn on the Power and set to PLAY Mode by turning the WORM WHEEL without cassette. 2) Confirm with your eyes whether the datum hole of TENSION LEVEL meets that of the MAIN BASE. 3) If they do not meet, turn the BAND BRAKE CAP to the CW or the CCW direction until holes meet each other (See Fig. 4-6).
Fig. 4-6 ADJUSTMENT OF THE TENTION POLE POSITION
5. MEASUREMENT OF THE BACK TENSION
1) Before mesuring the BACK TENSION, make sure that the position of TENSION POLE is adjusted correctly. 2) Play back T-120 tape at its center position without F/L ASS?Y, wait until the tape running is stabilized (about 10-20 seconds). 3) Set the Tentelometer as shown in Fig. 4-7 and confirm the scale (SPEC: 20-27 gr/cm). 4) If the scale indicates more than 27 gr/cm, move the TENSION SPRING to "A" direction and less than 20 gr/ cm, move to "B" direction. (See Fig. 4-7) NOTES: · Make sure that the three probes of the TENTELOMETER as all in good contact with tape. · It is recomended to be measured three times as TENTELOMETER is very sensitive.
Fig. 4-7 MEASUREMENT OF THE BACK TENTION
35
5. THE ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM
The tape transporting system has been precisely adjusted at the factory and does not ordinary require readjustment. But when the noise and tape damage takes place and parts that compose the tape transporting system are replaced due to troubles by long usage or unexpected accidents, check and readjust the tape transporting system.
5-1. THE SCHEMATIC DIAGRAM OF TAPE TRANSPORTING SYSTEM
Fig. 5-1
36
2. ADJUSTMENT FLOW
CLEANING CHANGE · DRUM TOTAL ASS'Y · A/C HEAD ASS'Y · PINCH LEVER TOTAL ASS'Y PATH ROUGH ADJ.
SEC. 2-2
S GUIDE ROLLER HEIGHT ADJ.
S GUIDE POST FLANGE
T GUIDE ROLLER HEIGHT ADJ.
A/C HEAD TILT ADJ.
A/C HEAD HEIGHT ADJ.
PATH PRE-ADJ. CHANGE · S-POLE BASE ASS'Y · T-POLE BASE ASS'Y · TENSION LEVER ASS'Y LINEARITY ADJ.
(PG)
ENTERANCE ENVELOPE
EXIT ENVELOPE WAVEFORM
ENTERANCE & EXIT ENVELOPE WAVEFORM FINE ADJ. · X-POSITION ROUGH ADJ. · ENTERANCE & EXIT ENVELOPE WAVEFORM FINE ADJ. · REVIEW ¡OEPLAY AUDIO ADJ. AUDIO TILT, HEIGHT AZIMUTH ADJ
X-POSITION ADJ.
SP, EP
TRACKING
37
3. REPLACEMENT OF THE S, T SLANT POLE ASS?Y(See Fig. 3-3)
1) Remove the DRUM TOTAL ASS?Y according to the method of the SEC. 3-2. 2) Remove the 2 screws ! and the LOADING GUIDE PLATE @ . 3) Remove the R & L LOADING GEAR ASS?Y# , $ . 4) Remove the S & T SLANT POLE ASS?Y% , ^ after moving them to the point "A" by pulling them in the direction of the arrow ¨O. 5) After changing new SLANT POLE ASS?Y please assemble it in the reverse order. 6) Be careful not to get grease on the GUIDE ROLLER.
Fig. 3-3
38
T GUIDE POST
TAPE Turn the TILT SCREW @ to the direction of CW.
Turn the TILT SCREW @ to the direction of CCW.
Fig. 5-3 1-3) THE HEIGHT ADJUSTMENT OF A/C HEAD
TAPE GAP = 0.5 mm
Fig. 5-4 A. Make sure that the gap is 0.5mm between the lower end of tape and that of CTL HEAD. B. Turn and adjust the screw to CCW in order ! ¡ @ ¡ # when the gap is longer than 0.5mm. C. Turn and adjust the screw to CW in order ! ¡ @ ¡ # when the gap is shorter than 0.5mm.
39
2) PLAYBACK PHASE ADJUSTMENT (PG ADJUSTMENT) A. Connect the CH 1 of OSCILLOSCOPE to the TP 01-3 (HEAD SWITCHING PULSE) and connect the CH 2 to the VIDEO OUT and adjust the TRACKING VR to the center. B. Play back the STAIR STEP SIGNAL TAPE (DP-2). C. Adjust the PG VOLUME for time interval of 6.5H ± 0.5H between switching pulse and V-sync signal.
CH 1
CH 2
6.5H ± 0.5H
Fig. 5-5 3) LINEARITY ADJUSTMENT Connect the CH1 of the OSCILLOSCOPE to the TP01-2 (CTL PULSE). CH2 to the TP01-4 (ENVELOPE WAVEFORM) and EXT. TRIGGER to the TP01-3 (SWITCHING PULSE) and play back the TEST TAPE in SP mode. 3-1) AJUSTMENT OF THE S, T GUIDE ROLLER A. Adjust the TRACKING VR to obtain maximum FM SIGNAL of the TEST TAPE. B.Adjust the S, T GUIDE ROLLER (refer to Fig. 5-1 $ , * ) until the ENVELOPE waveform at the entrance and the exit sides is as shown in Fig. 5-6.
a: MAX. OUTPUT OF ENVELOPE b: MIN. OUTPUT OF ENVELOPE
a
b
b/a ¡^0.75
Fig. 5-6
40
3-2) ROUGH ADJUSTMENT OF THE X-POSITION A. Turn the TRACKING VR to center. B. Release the $ , % screw of the AC HEAD in Fig.5-2 about 90-120 degrees. C. Turn the AC HEAD TOT AS to obtain maximum ENVELOPE waveform by using the () driver as shown in Fig. 5-2.
CENTER CCW CW
TRACKING CCW
TRACKING CENTER
TRACKING CW
Fig. 5-7 3-3) THE FINE ADJUSTMENT OF THE ENTRANCE AND THE EXIT SIDES OF ENVELOPE WAVEFORM A. Turn the TRACKING VR to CW or CCW and check the ENVELOPE waveform is changed uniformly. B. If the ENVELOPE waveform as shown in Fig.5-8, 9, 10 is not uniformed, adjust the S, T GUIDE ROLLER repeatedly at the point of nonflat.
DRUM INPUT Fig. 5-8
DRUM OUTPUT Fig. 5-9
Fig. 5-10
41
3-4) CHECK FOR TRANSITIONAL OPERATION FROM REVIEW WAVEFORM TO PLAY WAVEFORM A. Play back DP-2 test tape (Recorded Stairstep signal in SP mode). B. Make sure the ENVELOPE waveform is maximum. C. Review the tape and push the PLAY BUTTON after 5 seconds at least. Check whether the ENVELOPE waveform is returned to the normal PLAY waveform or not within 3 seconds and there is any noise at the upper and lower side of monitor. D. In case return of the ENVELOPE waveform at the entrance and the exit sides is slow or the noise is occurred at the upper or lower side of monitor, check the running state of tape at the lower end of T GUIDE POST. If the tape is creased, re-adjust the S, T GUIDE ROLLER.
ENVELOPE WAVEFORM.
MONITOR
REVIEW
PLAY
Fig. 5-11 4) AUDIO ADJUSTMENT Make sure no tape wrinkle is caused at the lower end of T GUIDE POST during play and if not, perform the audio adjustment. 4-1) ADJUSTMENT OF THE AUDIO TILT AND HEIGHT A. Connect the AUDIO OUTPUT to the AUDIO LEVEL METER. B. Play back the DP-1 (COLOR BAR) and check the level of the AUDIO OUTPUT. SPEC.: MIN. OUTPUT 4.5~8.5dBm. C. In case the output of 1KHz is out of the specification, re-adjust the TILT and the HEIGHT of AC HEAD at the same method as 1-2) and 1-3).
42
4-2) AUDIO AZIMUTH ADJUSTMENT A. In state of the connecting AUDIO OUTPUT to AUDIO LEVEL METER, play back the DP-2 tape (STAIRSTEP: 6KHz). B. Adjust the AUDIO output to be maximum by turning of AC HEAD AZIMUTH SCREW (refer to Fig. 5-2 # ). SPEC.: MIN OUTPUT: 8.5~12.5DBM THE DIFFERENCE BETWEEN 1KHz AND 6KHz: +2~4dBm THE RANGE OF CHANGE OF AUDIO LEVEL IN 6KHz: less than 1dBm. C. After adjusting, check whether the tape is shaked or flickered during running in between T GUIDE ROLLER and AC HEAD. If the problem is occurred, re-adjust the AUDIO. D. After adjusting, reconfirm the ENVELOPE waveform. If the problem is occurred, perform the fine adjustment of the entrance and the exit sides of ENVELOPE WAVEFORM at the article 3-3) method. 5) X-POSITION ADJUSTMENT A. Connect CH 1 of the OSCILLOSCOPE with TP01-2 (CTL PULSE), CH2 with TP01-4 (ENVELOPE) and EXIT. TRIGGER with TP01-3 (SWITCHING PULSE). B. After tuning the TRACKING VR to center, play back the TEST TAPE (SP MODE). C. Turn the AC HEAD TOT AS by using () driver in the same method as Fig. 5-2 in order that the ENVELOPE waveform is as shown in Fig. 5-12 when the TRACKING VR is turned to CW or CCW. D. After adjust the X-POSITION, please confirm the PG.
A
B
C
CH A (R HEAD) TRACKING CCW 10ms
CH A (R HEAD) TRACKING CENTER
CH A (R HEAD) TRACKING CW 10ms
A¡ C
Fig. 5-12
43
D. If not, re-adjust from the article B. E. After adjusting X-POSITION, check whether 6KHz output of DP-2 is maximum. F. When the adjustment is completed, fasten the AC HEAD SCREW $ , % suitably. 6) CHECK FOR THE LINEARITY OF CO-EXCHANGING TRACKING
a : MAX b : MIN
a b
Vert = b/a
(FM) TRACKING VR MODE TAPE CHECK CCW 6ms LINEARITY SP DP-2 NOISE NOTHING NOTHING NOTHING 4:3 CCW 4ms CENTER 4 : 3.5 CW 6ms 4:3
7) FINAL CHECK Make sure no tape wrinkle is caused at each GUIDER ROLLER and POST.
44
6. EXPLODED VIEW AND PARTS LIST
1. EXPLODED VIEW OF DECK ASS'Y
45
2. PARTS LIST OF DECK ASS'Y
46
47
3. EXPLODED VIEW OF F/L ASS'Y
48
4. PARTS LIST OF F/L ASS'Y
49
5. MAIN SPARE PARTS LIST OF DECK ASS'Y
50
51