Text preview for : T5 serie VCR.pdf part of Brandt serie T5 Meccanica Video VHS
Back to : VCR.part1.rar | Home
T5 - DECK MECHANISM
(For EUROPE)
CONTENTS
1. DESCRIPTION OF THE MECHANISM ....................................................2 2. ASSEMBLY DIAGRAM AND MAJOR PARTS CHECK.........................4 3. DIASSEMBLY AND REPLACEMENT .....................................................10 4. MECHANICAL ADJUSTMENT .................................................................16 5. ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM .................19 6. EXPLODED VIEW........................................................................................25 7. PARTS LIST....................................................................................................29
1. DESCRIPTION OF THE MECHANISM
1-1 Characteristic of T5-DECK MECHANISM
1) T5-MECHA follows the VHS and the NTSC standard. 2) T5-MECHA uses 3 MOTORS (DRUM MOTOR, CAPSTAN MOTOR, L/C MOTOR). 3) T5-MECHA uses L/C Motor to drive FRONT LOADING. 4) T5-MECHA uses 4-BIT MODE signal to recognize each MODE. This 4-BIT MODE signal is generated from the cam switch driven by the L/C MOTOR. 5) T5-MECHA has 7MODES (EJECT/INITIAL/REV/IDLE/PLAY,STOP,SLOW/BRAKE/FF&REW) operation. 6) T5-MECHA deduce the MODE changing time by adopting the full loading system which maintains the tape winding the drum circumference. 7) T5-MECHA can be separated from the main pcb, and be assembled with B-B type connector. This B-B type connectioning means that CAPSTAN MOTOR, LC MOTOR, AC HEAD, FE HEAD, DRUM are connected directly without using connector cable.
2
1-2 Wire Diagram
1-3 Connector Pin Arrangement
3
2. ASSEMBLY DIAGRAM AND MAJOR PARTS CHECK
2-1 Assembly Diagram 2-1-1) DECK Assembly Diagram
A. UPPER VIEW
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 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 24 CABLE FFC
4
B. BOTTOM VIEW
19 LOADING RACK 20 L LOADING ASS'Y 21 R LOADING ASS'Y 22 CONNECT PLATE 23 REEL BELT 24 CABLE FFC
5
2-1-2) FRONT LOADING Assembly Diagram
! @ #
* $ % &
^
1 FL BRKT L 2 TOP PLATE 3 SAFETY LEVER L 4 LOADING LEVER AS
5 CST HOLDER AS 6 DOOR OPENER 7 SAFETY LEVER R 8 FL BRKT R
6
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 apperatus and to lengthen the life of mechanism and tapes, we strongly urge you to perform the periodic maintenance and inspection as described below. · Following should be done after the substition of parts of deck or correction of deck failure. B. Cleaning of the DRUM TOTAL ASS`Y - Slowly turnning DRUM TOTAL ASS`Y, wipe the drum surface with clean cloth soaked in alchol. (Don't connect the power when turnning the UPPER DRUM) - Don't wipe the Head-Tip vertically with cleaning cloths. C. Tape transporting section cleaning - Clean the tape transporting section with clean cloth soaked in alchol. D. Driving section cleaning - Clean the driving section with clean cloth soaked in alchol. E. Everyday inspection - Perform the maintenance and inspection periodically according to the number of use. - Refer to the table 2.2.3.
2-2-2) Cleaning and Lubrication
A. Cleaning of Tape Transporting section and driving section a. Cleaning of Tape Transporting section - The following parts shoule be cleaned after every 500 hours of use. · TENSION POLE · S SLANT POLE · AC HEAD/AE HEAD · GUIDE POST · VIDEOHEAD / DRUM · T GUIDE POST · FE HEAD · T SLANT POLE · CAPSTASN SHAFT · S GUIDE ROLLER · T GUIDE ROLLER · PINCH ROLLER - Because the above part contact with video tape, they tend to be stained with dusts and foreign substances which make the bad effect on the picture and sometimes lead to the tape damage. - Be sure to check the remained alchol during cleaning evaporated thoroughly before using a tape. b. Cleaning of the driving section · REEL TABLE · CAPSTAN FLYWHEEL/PULLEY · REEL PULLEY B. Lubrication · REEL GEAR POST : After the cleaning the parts with alchol, lubricate them with one or twol drops of ool · S/T REEL TABLE POST : After the cleaning the parts with alchol, lubricate them with grease.
2-2-3) Service Sechedule for each parts
Following parts should be checked according to the recommanded intervals
Period Service (Hours) PART Name DRUM TOTAL ASS'Y CAPSTAN MOTOR L/C BRKT TOTAL ASS'Y REEL BELT IDLER PLATE TOTAL ASS'Y REEL TABLE T BRAKE ASS'Y TENSION BAND ASS'Y PINCH ROLLER ASS'Y AC HEAD ASS'Y FE HEAD REEL BRKT TOTAL ASS'Y : Check and replace if necessary. : Replace 1000 2000 3000 4000 5000
NOTE: Independant of the above service shedule, Cleaning and lubrication and replacement of the belt sould be undertaken every 2 years.
7
2-3 Jig and Tools 2-3-1) List of Jigs and Tools
NO ITEMS MODEL NTSC: SP MONOSCOPE 7KHz SP COLOR BAR 1KHz (EP MONOSCOPE) DHC-602V KT-300NV KT-300RV TSH-V4 FIG. NO REMARKS CHECKING OF THE TAPE TRANSPORTING SECTION CHECKING OF THE TAPE TRANSPORTING SECTION MEASUREMENT OF THE 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 SECTION ASSEMBLY, DISASSEMBLY AND ADJUSTMENT
1
ALIGNMENT TAPE
!
2
CLEANING TAPE (DAEWOO) CASSETTE TAPE TORQUE METER(KOKUSAI) VHS SPINDLE HEIGHT GAUGE TENTELO METER (TENTELO) FAN TYPE TENSION METER
@
3
#
4
$
5
T2-H7-UM
%
6
< 3KG
^
7
DENTAL MIRROR
& *-1 *-2
+DRIVER
8 ADJUSTMENT DR IVER
8
2-3-2) A Skectch 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
3. DISASSEMBLY AND REPLACEMENT
3-1 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 MAIN BASE settling down point by lifting the rear part of F/L(Screw hole).
3-2 Disassembly of FRONT LOADING ASS'Y (FIg. 3.2~3.5)
a. Remove the one WASHER for holding the door opener and separtate 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 CASSETT HOLDER ASS`Y by moving the FL BRKT L and FL BRKT R in the direction of arrow (Fig. 3.2)
Fig. 3.1 Diassembly of the FRONT LOADING ASS`Y
Fig. 3.2 Diassembly of the FRONT LOADING ASS`Y
10
c. Separate the LOADING LEVER ASS`Y by pressing the connection point from the CASSETTE HOLDER ASS`Y.(Fig. 3.3) d. Remove the SAFETY SPRING connecting the SAFETY LEVER and CASSETTE HOLDER PLATE.(Fig. 3.3) e. Remove the RELEASE SPRING connecting the RELEASE LEVER and SAFETY LEVER.(Fig3.3)
3-3 Disassembly of DRUM ASS'Y (Fig. 3.5)
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 main base. b. Separatet 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 diassembly.
CAUTION: · After the assembly of the DRUM TOTAL ASS`Y, check out if DECK mecahnism operate smoothly and adjustment of tape transmission section is OK.
FIg. 3.3 Disassembly of the CASSETTE HOLDER Ass'y CAUTION: Assemble the FRONT LOADING ASS`Y in the reverse step of diassembly. Confirm that two 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 two bosses on the right side of the CASSETTE HOLDER ASS`Y into the groove of the F/L BRACKET R.(Fig. 3.4)
FIg. 3.5 Diassembly of DRUM ASS`Y
FIg. 3.4 Assembly of the FL Ass'y
11
3-4 Disassembly of LOADING RACK, LOADING ASS'Y, S/T SLANT POLE ASS'Y (Fig. 3.6, 3.7)
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 dircetion. 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. 3.7 in assembly.
3-5 Disassembly of the A/C HEAD ASS'Y (Fig. 3.8)
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 thescrew # CAUTION: · After the assembly, adjust the tape transmissionsection by refering to the chapter 5. · After the adjustment of the tape transmission section, paint the 3 adjustment screw with locking paint.
FIg. 3.6 Disassembly of the LOADING RACK, LOADING ASS'Y and the SLANT POLE ASS'Y
FIg. 3.8 Disassembly of the AC HEAD ASS'Y
FIg. 3.7 Assembly of the L/R LOADING AS and the LOADING RACK
12
3-6 Disassembly of the LC BRKT ASS'Y, PINCH LEVER TOTAL ASS'Y (Fig. 3.9)
a. Separate the LC BRKT Ass'y @ after removing the 3 screws !. 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 SPRINGPINCH "A" is located at the end of trajectory of CAM GEAR "B" in assembly (Refer to Fig. 4.3)
3-7 Disassembly of the CAM GEAR, RELAY LEVER, FL RACK (Fig. 3.9)
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. 3.10, Fig. 3.11 and chapter 4.
FIg. 3.10 Assembly of the CAM GEAR, RELAY LEVER
FIg. 3.11 Assembly of the CAM GEAR, FL RACK
FIg. 3.9 Disassembly of the LC BRACKET ASS'Y from the PINCH LEVER TOTAL ASS'Y
13
3-8 Disassembly of the S/T BRAKE ASS'Y (Fig. 3.12)
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 %.
3-11 Disassembly of the FE HEAD (Fig. 3.13)
a. Remove the screw ^ and separate the FE HEAD & from the MAINBASE.
FIg. 3.13 Disassembly of the TENSION BAND ASS'Y, CAPSTAN MOTOR and the FE HEAD FIg. 3.12 Disassembly of the S/T BRAKE ASS'Y
3-9 Disassembly of the TENSION BAND ASS'Y (Fig. 3.13)
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. 3.14. · 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 #.
3-10 Disassembly of the Capstan Motor (Fig. 3.13)
a. Separate the CAPSTAN MOTOR % after the removal of 3 screws $ holding the capstan motor. FIg. 3.14 Adjustment of the TENSION POLE POSITION
14
3-12 Disassembly of the REEL TABLE, IDLER PLATE TOTAL ASS'Y (Fig. 3.15)
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 disassembling.
3-13 Disassembly of the REEL BRKT TOTAL ASS'Y, CONNECT PLATE (Fig. 3.16)
a. Turn over the DECK MECHANISM and remove 2 screws !. 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 diassembly of the REEL BRKT TOTAL ASS`Y, take care REEL BELT and REEL FELT not to be stained with GREASE, OIL, or foreign substance. · diassembly of the IDLER ASS`Y should be precede the diassembly of the REEL BRKT TOTAL ASSY. · Check the operation of the REEL BRKT TOTAL ASSY before assembly. · Check the operation of FF/REW, PLAY, CUE, and REVIEW work well and existence of noise during the mode operation..
FIg. 3.15 Disassembly of the REEL TABLE and the IDLER PLATE TOTAL ASS'Y
FIg. 3.16 Disassembly of the REEL BRKT TOTAL ASS'Y and the CONNECT PLATE
15
4. MECHANICAL ADJUSTMENT
4-1 Mechanical Adjustment (Fig. 4.1~4.4)
In case of diassembly and reassembly for fixng the mecanical problem, check the following check point. a. Make sure that the DATUM HOLE of the CAM GEAR is aligned wth the DATUM HOLE in the MAINBASE in the EJECT modew 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)
TUR N T O T HE END
ALIGN
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
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.
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 "4.4 Adjustment of the TENSION POLE position". b. Play back 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 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 "4.4 Adjustment of the TENSION POLE position".(Fig. 4.6) CAUTION: · If the measurement result greater than the upper limit, change the hook point of the spring to position "A" · Confirm that all of the three probes of TENTELO METER are in contect with the tape. · During measuring, don`t touch any other parts of the MECHANISM(i.e. MAINBASE). It is recommendedthat this measurment 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
4-3 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.
4-4 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 "4.3 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 aligns with each other. FIg. 4.6 Adjustment of the TENSION POLE POSITION
18
5. ADJUSTMENT OF THE TAPE TRANSPORT 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 mechanism, tape transporting section readjustment is required. In adjustment of the tape transmission section refer to the following flow chart.
FIg.5.1 A schematic diagram of the tape transport ing section.
If any components shown in Fig. 5.1 are changed, readjustment of the tape transporting section is needed.
19
CLEANING
· DRUM TOTAL AS · A/C HEAD AS · PINCH LEVER TOTAL AS
S/T GUIDE ROLLER HEIGHT ADJUSTMENT
S/T GUIDE ROLLER FLUNGE
A/C HEAD AS ADJUSTMENT (TILT ADJUSTMENT)
AUDIO AZIMUTH ADJUSTMENT
A/C HEAD ADJUSTMENT
X-POSITION ADJUSTMENT
PLAYBACK PHASE ADJUSTMENT
LINEARITY ADJUSTMENT · S SLANT PLOE AS · T SLANT POLE AS · TENSION BAND AS
DRUM ENTRANCE/EXIT ENVELOPE FINE TUNING
REVIEW
PLAY CHANGING OPERATION CHECK
AUDIO OUTPUT CHECK (A/C HEAD HEIGHT& TILT ADJUSTMENT)
AUDIO AZIMUTH ADJUSTMENT
X-POSITION ADJUSTMENT
TRACKING
Table.1 Adjustment Flow Chart of the Tape Transporting System
20
A. Adjustment of the S/T GUIDE ROLLER
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 ateatch 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.
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 the ALIGNMENT 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 b. If there is any problem, Turn the AC HEAD TILT SCREW until the running status improved. (Fig. 5.2)
C.Adjustment of the AC HEAD Height(Fig. 5.3)
a. Paly back a T-120 TAPE.. b. Make sure that the gap between the lower end of TAPE and the AC head is 0.25m.
FIg.5.3 Adjustment of AC HEAD Height c. If the measurement of the gap is different from the reference value 0.25mm, turn the screw ! , # until the desired gap is obtained.
21
G.Adjustment of the LINEARITY(Fig. 5.7)
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE VR CONTROL Adjustment S/T GUIDE ROLLER Test Point PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE TAPE TRANSPORT SECTION
FIg.5.5 Adjustment of the X-POSITION
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 FIXTURE S/W PULSE TEST PIN on the PATH ADJ. CHANNEL-1 SCOPE PROBE.
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 done precisely, 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 : MON-SCOPE 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. Control the PG VOLUME until the time interval between the SWITCHING PULSE and the V-SYNC SIGNAL is within the 6.5H±0.5H as shown in Fig. 5.6.
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.
a: Max Output of Envelope b: Min Output of Envelope FIg.5.7 Adjustment of Linearity
Fig.5.6 Playback Phase Adjustment
22
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 GUIDE ROLLER Test Point PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE TAPE TRANSPORT SECTION
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.
BOARD with a CHANNEL-2 SCOPE PROBE (1V/div). e. Make the VR CONTROL on the PATH ADJ. FIXTURE to the center to maximize the ENVELOPE signal. f. Play back the REVIEW mode about 15 second and alter the mode to PLAY MODE. g. Check whether the ENVELOPE waveform restore to its original form within 3 second when the REVIEW mode is changed to PLAY mode. h. If the requirement of "g" is not satisfied, Check the running status of tape on the lower part of TGUIDE POST and adjust the S/T GUIDE ROLLER precisely
FIg.5.9 Waveform change when the modealtered (REVIEW £PLAY) .J.Checking 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 TRANSPORT SECTION
S/W PULSE TEST PIN ENVELOPE TEST PIN Measurement Equipment OSILLOSCOPE VR CONTROL Adjustment S/T GUIDE 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
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 GUIDE ROLLER Test Point PATH ADJ. FIXTURE PATH ADJ.FIXTURE PATH ADJ.FIXTURE TAPE TRANSMISSION T 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 maximum.(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 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. 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 X-POSITION by referring to subitem "E"(Adjustment of the XPOSITION). g. Repeat the process of subitem "F"(PLAYBACK PHASE ADJUSTMENT).
24
6. EXPLODED VIEW
6-1 Exploded View of DECK Ass'y ( Top View)
25
6-2 Exploded View of DECK Ass'y ( Bottom View)
26
6-3 Exploded View of FL Ass'y
27
6-4 Exploded View of DRUM Ass'y
D0040
D0020
D0040
D0050
D0010
D0060
D0070
28
7. PARTS LIST
7-1 Parts List of DECK TOTAL ASS'Y
LOC. NTSC M1000 PAL M1000 SECAM M1000 PARTS CODE PVDKARNB41 PVDKARNB60 PVDKARPB20 PVDKARPB60 PVDKARPB20 PVDKARSB60 PARTS NAME VCR DECK AS(T50) VCR DECK AS(T50) VCR DECK AS(T50) VCR DECK AS(T50) VCR DECK AS(T50) VCR DECK AS(T50) PARTS DESCRIPTION DRN-B401 (4HD, SP/LP, NON-DLC, AHC) DRN-B600 (6HD, HI-FI, NON-DLC) DRP-B200 (2HD, SP/LP, NON-DLC) DRP-B600 (6HD, HI-FI, NON-DLC) DRP-B200 (2HD, SP/LP, NON-DLC) DRS-B600 (6HD, HI-FI, NON-DLC)
7-2 Parts List of DRUM PRICE ASS'Y
LOC. NTSC AD001 PAL AD001 SECAM AD001 PARTS CODE 97PA284901 97PA285201 97PA285901 97PA285601 97PA285901 97PA285801 PARTS NAME DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS DRUM PRICE AS PARTS DESCRIPTION CYN-T410C(4HD SP/LP NON-DLC) CYN-T610C(6HD HI-FI NON-DLC) CYP-T210C(2HD SP/LP NON-DLC) CYP-T610C(6HD HI-FI NON-DLC) CYP-T210C(2HD SP/LP NON-DLC) CYS-T610C(6HD HI-FI NON-DLC)
7-3 Parts List of VCR DECK ASS'Y
LOC. PARTS CODE DRUM ASS'Y D0010 D0020 97SA329500 97SA329800 D0040 7001260711 D0050 97SA320400 D0060 97S2303600 D0070 97S2303800 D0070 97S2303900 DECK ASS'Y AM001 A0100 97SA332200 A0200 97SA316500 A0300 97SA316600 A0400 97S8103100 A0401 97S3102020 PARTS NAME DRUM AS DRUM M/T AS DRUM M/T AS SCREW MACHINE EARTH GROUND AS HOLDER MAIN HOLDER CAP(B) HOLDER CAP(C) DECK AS MAIN BASE AS S SLANT POLE AS T SLANT POLE AS MOTOR CAPSTAN SCREW TAPPTITE PARTS DESCRIPTION (REFERRING TO LIST OF DRUM PRICE) DMVDMT07F I20AL-05G2 PAN 2.6X7 MFZN T-DRUM POM(KEPITAL F20) POM(4CH) POM(6CH) DECK ASS'Y (REFERRING TO LIST OF DECK TOTAL ASS'Y) T4.5-MECHA T-MECHA T-MECHA F2QVB-05 TT2 BIN-B 2.6X7 MFZN
29
LOC. PARTS CODE A0600 97SA320500 A0601 7051300611 A1000 97SA316800 A1100 97SA316900 A1200 97S2709500 A1201 7008301911 A1400 97S0904310 A1500 97SA319410 A1501 7274300511 A1700 97S5500400 A1800 97S2623200 A1900 97S2709600 A2000 97S2708200 A2100 97SA317100 A2200 97SA318050 A2201 7274300511 A2400 97SA317310 A2401 97S3108200 A2600 97S2909400 A2700 97SA317200 A2800 97SA317400 A2900 97SA317510 A3000 97S8015000 A3001 7274300811 AC001 97SA326900 AF002 7274300511 AD002 7001300611 AD003 97P88F0B20 AN002 2291131304 FL ASS'Y AF001 97SA261040 AF002 7274300511 A5000 97S2401400 A5100 97S2401500 A5200 97SA317700 B3400 97SA415400 B3410 97S2621600 B3420 97S3008900 B3430 97S2621700 B3440 97S2621800 B3450 97S3009000 A5300 97SA317810 A5400 97S0903910 A5401 7274300611 A5600 97S2622700
PARTS NAME AC HEAD AS SCREW MACHINE L LOADING AS R LOADING AS RACK LOADING SCREW MACHINE PLATE CONNECT-H REEL BRKT TOTAL AS SCREW TAPPTITE BELT REEL LEVER RELAY RACK FL GEAR CAM PINCH LEVER TOT AS LC BRKT AS SCREW TAPPTITE IDLER PLATE TOT AS POLYWASHER TABLE REEL TENSION LVR TOT AS S BRAKE AS T BRAKE AS HEAD FE SCREW TAPPTITE HEAD CLEANER AS SCREW TAPPTITE SCREW MACHINE CABLE FFC GREASE F/LOADING AS SCREW TAPPTITE BRKT FL L BRKT FL R CST HOLDER AS CST HOLDER SUB AS LEVER SAFETY L SPRING SAFETY LEVER LEVER SAFETY R LEVER RELEASE SPRING RELEASE LEVER F/L LEVER AS PLATE TOP SCREW TAPPTITE LEVER DOOR OPENER
PARTS DESCRIPTION T-MECHA PAN 3X6 SW MFZN T-MECHA T-MECHA SECC T1.2 WAS M3*19 MFZN SECC T1.0 T2-MECHA TT3 RND 3X5 MFZN CR68 SECC T1.2 PBT(DY4410GF) NATURAL DERLIN 100 T-MECHA T5-MECHA TT3 RND 3X5 MFZN T2-MECHA D2.6XD6.0XT0.5 POM(F20-03) BLACK T-MECHA T-MECHA T2-MECHA HVFHU0030AK TT3 RND 3X8 MFZN T-MECHA TT3 RND 3X5 MFZN PAN 3X6 MFZN 1.25K 11P 200MM DELUXE 5221G(NAM-YOUNG) T5-MECHA TT3 RND 3X5 MFZN SECC T1.0 SCEE T1.0 T-MECHA T-MECHA SCTT T1.0 SUS304 WPB D0.5 SUS304 T0.5 POM(F20-03) NATURAL SUS304 WPB D0.25 T4.5-MECHA SECC T1.0 TT3 RND 3X6 MFZN POM(F20-03) BLACK
30