Text preview for : DX9R serie VCR.pdf part of Samsung DX-9R Mechanical Manual Vhs Deck (1998) - (2.552Kb) 2 Part File - pag. 25
Back to : vcr_mechanical_.part1.rar | Home
DX-9R
MECHANICAL MANUAL DX-9R
MECHANICAL
3 File with the SERVICE MANUAL. VHS DECK
Manual
CONTENTS
1. Disassembly and Reassembly
ELECTRONICS
2. Alignment and Adjustment
© Samsung Electronics Co., Ltd. NOV. 1998 Printed in Korea AC68-00001A
1. Disassembly and Reassembly
1-1 Deck Parts Locations
1-1-1 Top View
OE
´
¨
^
Fig. 1-1 Top parts Location-1
Ø
OE ´ ¨ ^ Ø
BRACKET FL TOP GEAR FL CAM MOTOR LOADING ASS'Y LEVER FL ARM ASS'Y HOLDER FL CASSETTE ASS'Y LEVER FL DOOR SLIDER FL DRIVE
Samsung Electronics
1-1
Disassembly and Reassembly
OE
´
¨
^
Ø
"
'
Ô
Ò
Ú
Ò
Æ
i
Fig. 1-2 Top Parts Location-2 OE ´ ¨ ^ Ø " ' FE HEAD PLATE CYLINDER C CYLINDER ASS'Y PLATE CYLINDER B PLATE CYLINDER A ACE HEAD ASS'Y UNIT PINCH ASS'Y LEVER #9 GUIDE ASS'Y LEVER TENSION ASS'Y BAND BRAKE ASS'Y Ô DISK S REEL LEVER S BRAKE ASS'Y Ò GEAR IDLE Ú LEVER IDLE Æ LEVER T BRAKE ASS'Y i DISK T REEL
1-2
Samsung Electronics
Disassembly and Reassembly
1-1-2 Bottom View
OE
´
¨
^
Ø
"
'
Ô
Fig. 1-3 Bottom Parts Location OE ´ ¨ ^ Ø " ' Ô GEAR JOINT 1 GEAR JOINT 2 BRAKET GEAR MOTOR CAPSTAN ASS'Y LEVER T LOAD ASS'Y GEAR LOADING DRIVE LEVER S LOAD ASS'Y HOLDER CLUTCH ASS'Y BELT PULLEY SLIDER CAM SLEEVE TENSION
Samsung Electronics
1-3
Disassembly and Reassembly
1-2 Main Deck
1-2-1 Bracket FL Top Removal
1) Remove 2 screws OE. 2) Remove the Bracket FL Top ´. Note : Take care not to change assembly direction.
1-2-2 Lever FL Door Removal
1) Rotate the Lever FL Door OE in the direction of arrow ÒAÓ. 2) Release the Hook ´, remove the Lever FL Door OE in the direction of arrow ÒBÓ.
OE 2 SCREWS OE LEVER FL DOOR ´ BRACKET FL TOP "A"
"B" ´ HOOK
Fig. 1-5 Lever FL Door Removal
Fig. 1-4 Bracket FL Top Removal
1-4
Samsung Electronics
Disassembly and Reassembly
1-2-3 Holder FL Cassette Ass'y Removal
1) Remove the Lever FL Door. (Refer to Fig. 1-5) 2) Pull the Holder FL Cassette AssÕy OE to the eject position. 3) Pull the Holder FL Cassette AssÕy OE as grasping the Holder FL Cassette AssÕy OE and Lever FL Cassette-R ´ in the same time to release hooking from Main Base until the Boss [A], [B] of Holder FL Cassette AssÕy OE is taken out from the Rail [C], [D]. 4) Lift the Holder FL Cassette AssÕy OE in the direction of arrow ÒBÓ in this time, you have to grasp the Lever FL Cassette-R ´ continuously until the Holder FL Cassette AssÕy OE is taken out completely. Note : Be sure to insert Lever FL Cassette-R ´ in the direction of ÒAÓ to prevent separation and breakage of the Lever FL Cassette-R ´ at disassembling and reassembling.
1-2-4 Lever FL Arm Ass'y Removal
1) Remove the Lever FL Door. (Refer to Fig. 1-5) 2) Remove the Holder FL Cassette AssÕy. (Refer to Fig. 1-6) 3) Release the Hook OE in the direction of arrow ÒAÓ, pull out the Lever FL Arm AssÕy ¨ from the Boss of Main Base. 4) Remove the Lever FL Arm AssÕy ¨ in the direction of arrow ÒBÓ. Assembly : When reinstalling, be sure to reassemble Lever FL Arm AssÕy ¨ after you insert the Boss ´ in Groove [A] of Slider FL Drive .
OE HOOK "A" "B" ¨ LEVER FL ARM ASS'Y GROOVE [A] "B" BOSS [B] OE HOLDER FL CASSETTE ASS'Y "A" BOSS [A] RAIL [C] RAIL [D] ´ LEVER FL CASSETTE-R ´ BOSS SLIDER FL DRIVE
Fig. 1-7 Lever FL Arm Ass'y Removal
Fig. 1-6 Holder FL Cassette Ass'y Removal
Samsung Electronics
1-5
Disassembly and Reassembly
1-2-5 Slider FL Drive Removal
1) Pull the Slider FL Drive OE to the front direction. 2) Remove the Slider FL Drive OE in the direction of arrow. (Refer to Fig. 1-8)
1-2-6 Bracket Gear, Gear FL Cam, Gear Joint 1, 2 Removal
1) Remove screw OE. 2) Lift the Bracket Gear ´. 3) Remove the Gear FL Cam . 4) Lift the Gear Joint 2 ¨, Gear Joint 1 ^.
GEAR FL CAM
OE SCREW ´ BRACKET GEAR
^ GEAR JOINT 1 ¨ GEAR JOINT 2 OE SLIDER FL DRIVE
Fig. 1-8 Slider FL Drive Removal
Fig. 1-9 Bracket Gear, Gear FL Cam, Gear Joint 1, 2 Removal
1-6
Samsung Electronics
Disassembly and Reassembly
1-2-7 Assembly of Gear FL Cam, Gear Joint 1, 2
1) Be sure to align dot mark of Gear Joint 1 OE with dot mark of Gear Joint 2 ´ as shown Fig. 1-10 (Refer to Timing Point 1), confirm the Timing Point 2 of the Gear Joint 2 ´ and Slider Cam . 2) Align the Gear FL Cam ¨ with the Gear Worm Wheel Post as shown detail drawing. (Refer to Timing Point 3)
OE GEAR JOINT 1 ´ GEAR JOINT 2
1-2-8 Holder Worm, Gear Worm, Gear Worm Wheel Removal
1) Release the Hook [A] in the direction of arrow and, remove the Holder Worm OE. 2) Remove the Gear Worm ´. 3) Remove the Gear Worm Wheel . (After removing the Gear FL Cam as shown Fig. 1-9) Note : Secure the Hook [A] after installing the Holder Worm OE.
HOOK [A] SLIDER CAM
´ GEAR WORM OE HOLDER WORM
TIMING POINT 1
TIMING POINT 2 ¨ GEAR FL CAM
GEAR WORM WHEEL
Fig. 1-11 Holder Worm, Gear Worm, Gear Worm Wheel Removal
POST
GEAR WORM WHEEL TIMING POINT 3
Fig. 1-10 Assembly of Gear FL Cam, Gear Joint 1,2
Samsung Electronics
1-7
Disassembly and Reassembly
1-2-9 Motor Loading Ass'y Removal
1) Remove the screw OE. 2) Remove the Motor Loading AssÕy ´.
1-2-10 Gear Loading Drive, Slider Cam, Lever T, S Load Ass'y Removal
1) Remove the Belt Pulley. (Refer to Fig. 1-29) 2) Remove the Gear Loading Drive OE after releasing Hook [A] in the direction arrow as shown in detail drawing. 3) Remove the Slider Cam ´. 4) Remove the Lever T, S Load AssÕy , ¨.
´ MOTOR LOADING ASS'Y
OE GEAR LOADING DRIVE
HOOK [A]
´ SLIDER CAM
LEVER T LOAD ASS'Y
¨ LEVER S LOAD ASS'Y
OE SCREW
Fig. 1-12 Motor Loading Ass'y Removal
Fig. 1-13 Gear Loading Drive, Slider Cam, Lever T, S Load Ass'y Removal
1-8
Samsung Electronics
Disassembly and Reassembly
1-2-11 Assembly of Gear Loading Drive, Slider Cam, Lever T, S Load Ass'y
1) When reinstalling, be sure to align dot of Lever T Load AssÕy OE with dot of Lever S Load AssÕy ´ as shown in drawing. (Refer to Timing Point 1) 2) Insert the Pin A, B, C, D into the Slider Cam hole. 3) Be sure to align dot of Lever T Load AssÕy and dot of Gear Loading Drive ¨. (Refer to Timing Point 2) 4) Align dot of Gear Loading Drive with mark of Slider Cam as shown in drawing. (Refer to Timing Point 3)
TIMING POINT 1 OE LEVER T LOAD ASS'Y ´ LEVER S LOAD ASS'Y
1-2-12 Lever Tension Ass'y, Band Brake Ass'y, Sleeve Tension Removal
1) Remove the Spring Tension OE. 2) In bottom side of Deck, remove the Sleeve Tension ´ after rotating it right or left as lifting locking edge of Sleeve Tension. 3) Remove the side ÒaÓ of the Band Brake AssÕy ¨ in the direction of arrow ÒAÓ from the Lever Tension AssÕy . 4) Remove the side ÒbÓ of the Band Brake AssÕy ¨ in the direction of arrow ÒBÓ from the Main Base. Note : 1) When replacing the Lever Tension AssÕy, be sure to apply oil in the Sleeve Tension. 2) Take care not to touch stain on the felt side, and not to be folded and broken Band Brake AssÕy.
a
"B"
b
"A" ¨ BAND BRAKE ASS'Y
¨ GEAR LOADING DRIVE LEVER T LOAD ASS'Y TIMING POINT 2 TIMING POINT 3 LEVER S LOAD ASS'Y
OE SPRING TENSION
LEVER TENSION ASS'Y
PIN A
PIN D PIN B PIN C SLIDER CAM
Fig. 1-14 Assembly of Gear Loading Drive, Slider Cam, Lever T, S Load Ass'y
´ SLEEVE TENSION
Fig. 1-15 Lever Tension Ass'y, Band Brake Ass'y, Sleeve Tension Removal
Samsung Electronics
1-9
Disassembly and Reassembly
1-2-13 Lever S, T Brake Ass'y Removal
1) Release the Hook [A] and the Hook [B], [C] in the direction of arrow as shown in Fig. 1-16. 2) Lift the Lever S, T Brake AssÕy OE, ´ with Spring Brake . Assembly : 1) Assembly the Lever S Brake AssÕy OE on the Main Base. 2) Assembly the Lever T Brake AssÕy ´ with Spring Brake . Note : Take extreme care not to be folded and transformed spring Brake at removing or reinstalling.
1-2-14 Lever Idle Ass'y Removal
1) Push the Lever Idle OE in the direction of arrow ÒAÓ, ÒBÓ. 2) Lift the Lever Idle OE. Assembly : 1) Apply oil in two Bosses of Lever Idle OE. 2) Assemble the Gear Idle ´ with the Lever Idle OE. Note : When replacing the Gear Idle ´, be sure to add oil in the boss of Lever Idle OE.
HOOK [A]
"A" OE LEVER IDLE SPRING BRAKE HOOK [C] HOOK [A] ´ GEAR IDLE "B" ´ GEAR IDLE
OE LEVER S BRAKE ASS'Y
´ LEVER T BRAKE ASS'Y HOOK [B]
Fig. 1-17 Lever Idle Ass'y Removal
Fig. 1-16 Lever S, T Brake Ass'y Removal
1-10
Samsung Electronics
Disassembly and Reassembly
1-2-15 Disk S, T Reel Removal
1) Lift the Disk S, T Reel OE, ´.
1-2-16 Holder Clutch Ass'y Removal
1) Remove the Washer Slit OE. 2) Lift the Holder Clutch AssÕy ´.
OE WASHER SLIT ´ DISK T REEL
OE DISK S REEL
´ HOLDER CLUTCH ASS'Y
Fig. 1-18 Disk S, T Reel Removal
Fig. 1-19 Holder Clutch Ass'y Removal
Samsung Electronics
1-11
Disassembly and Reassembly
1-2-17 Lever Up Down Ass'y, Gear Center Ass'y Removal
1) Remove the 2 hooks in the direction of arrow as shown Fig. 1-20 and lift the Lever Up Down AssÕy OE. 2) Lift the Gear Center AssÕy ´.
1-2-18 Assembly of Lever Up Down Ass'y, Gear Center Ass'y
1) Insert the Lever Up Down AssÕy OE in the 2 rectangular holes on Main Base. 2) Lift the Lever Up Down AssÕy OE about 35 degree. (Refer to Fig. 1-21) 3) Insert Ring ¨ of the Gear Center AssÕy ´ in the Guide ^ of the Lever Up Down AssÕy OE. 4) Insert the Gear Center AssÕy ´ in the post Ø on Main Base. 5) Push down the Lever Up Down AssÕy OE for locking of the Hook . Note : 1) Take care not to separate and loose the Spring Up Down. 2) When assembling the Gear Center AssÕy, donÕt push down too much.
OE LEVER UP DOWN ASS'Y
´ GEAR CENTER ASS'Y
´ GEAR CENTER ASS'Y ^ GUDIE OE LEVER UP DOWN ASS'Y ¨ RING GEAR Ø POST HOOK 35°
MAIN BASE
Fig. 1-20 Lever Up Down Ass'y, Gear Center Ass'y Removal
Fig. 1-21 Assembly of Lever Up Down Ass'y, Gear Center Ass'y
1-12
Samsung Electronics
Disassembly and Reassembly
1-2-19 Guide Cassette Door Removal
1) Lift the Hook [A]. 2) Rotate the Guide Cassette Door OE in the direction of arrow. Note : After reinstalling the Guide Cassette Door OE secure the Hook [A].
OE GUIDE CASSETTE DOOR
1-2-20 Unit Pinch Ass'y, Plate Joint, Spring Pinch Drive Removal
1) Lift the Unit Pinch AssÕy OE. 2) Remove the Plate Joint ´ from Lever Pinch Drive. 3) Remove the Spring Pinch Drive . Note : 1) Take extreme care not to touch the grease on the Roller Pinch. 2) When reinstalling, be sure to apply grease on the post pinch roller.
´ PLATE JOINT OE UNIT PINCH ASS'Y
HOOK [A]
SPRING PINCH DRIVE
Fig. 1-22 Guide Cassette Door Removal
Fig. 1-23 Unit Pinch Ass'y, Plate Joint, Spring Pinch Drive Removal
Samsung Electronics
1-13
Disassembly and Reassembly
1-2-21 Lever #9 Guide Ass'y Removal
1) Remove the Spring #9 Guide OE. 2) Lift the Lever #9 Guide AssÕy ´ in the direction of arrow. Note : 1) Take extreme care not to touch the grease on the tape Guide Post. 2) After reinstalling, check the bottom side of the Post #9 Guide to stick to the top side of Main Base.
1-2-22 FE Head Removal
1) Remove the screw OE. 2) Lift the FE Head ´.
OE SCREW
´ FE HEAD
´ LEVER #9 GUIDE ASS'Y OE SPRING #9 GUIDE
Fig. 1-25 FE Head Removal
Fig. 1-24 Lever #9 Guide Ass'y Removal
1-14
Samsung Electronics
Disassembly and Reassembly
1-2-23 ACE Head Removal
1) Pull out the FPC from connector of ACE Head AssÕy ´. 2) Remove the screw OE. 3) Lift the ACE Head AssÕy ´.
OE SCREW
1-2-24 Slider S, T Ass'y Removal
1) Move the Slider S, T AssÕy OE, ´ to slot, and then lift it to remove. (Refer to arrow)
OE SLIDER S ASS'Y
´ SLIDER T ASS'Y ´ ACE HEAD ASS'Y
Fig. 1-27 Slider S, T Ass'y Removal Fig. 1-26 ACE Head Removal
Samsung Electronics
1-15
Disassembly and Reassembly
1-2-25 Cylinder Ass'y Removal
1) Remove the 3 Screws OE, , ^. 2) Remove the Plate Cylinder A, B, C ´, ¨, Ø in the direction of arrow. 3) Lift the Cylinder AssÕy . Note : 1) When reinstalling, push the Plate Cylinder A, B ¨, Ø in the reverse of arrow and then, tighten the 2 Screws , ^. 2) Take care not to touch the Cylinder AssÕy and the tape guide post at reinstalling Plate Cylinder C ´. 3) Take care not to touch the Cylinder AssÕy with screw driver at reinstalling the Plate Cylinder C ´.
1-2-26 Belt Pulley Removal
1) Remove the Belt Pulley OE. Note : Take extreme care not to touch the grease on Belt Pulley OE at assembling or reassembling.
OE BELT PULLEY
CYLINDER ASS'Y
OE SCREW ´ PLATE CYLINDER C SCREW ¨ PLATE CYLINDER B
^ SCREW
Ø PLATE CYLINDER A
Fig. 1-29 Belt Pulley Removal
1-2-27 Lever Head Cleaner Ass'y Removal (Optional)
1) Release the Hook OE. 2) Lift the Lever Head Cleaner AssÕy ´.
´ LEVER HEAD CLEANER ASS'Y
Fig. 1-28 Cylinder Ass'y Removal
OE HOOK
Fig. 1-30 Lever Head Cleaner Ass'y Removal
1-16
Samsung Electronics
Disassembly and Reassembly
1-2-28 Motor Capstan Ass'y Removal
1) Remove the 3 Screws OE. 2) Remove the Motor Capstan AssÕy ´. Assembly : 1) Match the 3 holes of Motor Capstan AssÕy ´ to the 3 holes of Main Base as attending not to drop or knock the Motor Capstan AssÕy. 2) Tighten the 3 Screws in the direction of arrow as shown detail drawing. Note : 1) DonÕt reuse the removed screws from Motor Capstan AssÕy. 2) After tightening screws, check if there is gap between the head of screws and the top side of Main Base. There should have no gap between the head of screws and the top side of Main Base. 3) After reinstalling, adjusting the tape transport system again.
1-2-29 How to Eject the Cassette Tape (If the unit does not operate on condition that is inserted into housing ass'y)
1) Remove the Holder worm OE and the Gear Worm ´. 2) Turn the Gear Worm Wheel counterclockwise with screw driver. (Refer to arrow)
GEAR WORM WHEEL
SCREW DRIVER
´ GEAR WORM OE HOLDER WORM
OE 3 SCREWS C A B
Fig. 1-32 3) When Slider S, T are approached in the position of unloading, rotate holder Clutch counterclockwise after inserting screw driver in the hole of frameÕs bottom in order to wind the unwounded tape. (Refer to Fig. 1-33) (If you rotate Gear Worm Wheel continuously when tape is in state of unwinding, you may cause a tape contamination by grease and tape damage. Be sure to wind the unwounded tape in the state of set horizontally.) 4) Rotate Gear Worm Wheel counterclockwise using screw driver again up to the state of eject mode and then pick out the tape. (Refer to Fig. 1-32)
´ MOTOR CAPSTAN ASS'Y
Fig. 1-31 Motor Capstan Ass'y Removal
FRAME
Fig. 1-33 Samsung Electronics 1-17
Disassembly and Reassembly
1-3 The table of clearing, Lubrication and replacement time about principal parts
1) The replacement time of parts is not life of parts. 2) The table 1-1 is that the VCR Set is in normal condition (normal temperature, normal humidity). The checking period may be changed owing to the condition of use, runtime and environmental conditions. 3) Life of the Cylinder AssÕy is depend on the condition of use. 4) See exploded view for location of each parts. * Parts Name POST TENSION SLANT POST S, T #8 GUIDE SHAFT CAPSTAN SHAFT #9 GUIDE POST #3 GUIDE POST GUIDE ROLLER S, T CYLINDER ASS'Y FE HEAD ACE HEAD PINCH ROLLER POST REEL S, T SLEEVE TENSION POST CENTER LEVER IDLE BOSS (2Point) CAPSTAN MOTOR PULLEY BELT PULLEY HOLDER CLUTCH ASS'Y GEAR CENTER ASS'Y GEAR IDLE (2Point) LOADING MOTOR BAND BRAKE ASS'Y BRAKE T ASS'Y Checking Period 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 O O O 3 3 3 3 O O O O O O O O O O O O O O 3 3 3 3 O O O O O O O O O O O O O O O O O 3 3 3 3 O O O O O O O O O O O O O O O O O O 3 3 3 3 O O O O O O O O O O O O O O O O O O 3 3 3 3 O O O O O O O O Remark - To clean the parts, use patch and alcohol (solvent). - After cleaning, use the video tape after alcohol is gone away completely. - We recommend to use oil [EP-56] or solvent. - One or two drops of oil should be applied after cleaning with alcohol. - Periodic time of applying oil (Apply oil after cleaning) - The excessive applying oil may be the cause of malfunction.
T A P E P A T H S Y S T E M
D R I V I N G
S Y S T E M
O O O O O O
B S R Y A S T K E E M
O O O O O O O
O O O O O O O O
O O O O O O O O
Æ : Cleaning
O : Check and replacement in necessary
3 : Add Oil
1-18
Samsung Electronics
2. Alignment and Adjustment
2-1 Tape Transport System and Adjustment Locations
The tape transport system has been adjusted precisely in the factory. Alignment is not necessary except for the following : 1) Noise observed on the screen. 2) Tape damage. 3) Parts replacement in the tape transport system. Lower flange height of tape guide is used as the reference for the transport adjustment. To maintain the height of the tape guide and prevent damage, do not apply excessive force onto the main base.
CYLINDER ASS'Y GUIDE ROLLER "S" GUIDE ROLLER "T" FULL ERASE HEAD HEIGHT SCREW
#3 GUIDE POST
TENSION POST TILT SCREW X - POSITION ADJUST SILT AZIMUTH SCREW CAPSTAN #8 GUIDE POST
PINCH ROLLER #9 GUIDE POST
SUPPLY REEL DISK
TAKE UP REEL DISK
Fig. 2-1 Location of Tape Transport Adjustment
FE HEAD POST TENSION CYLINDER ASS'Y PINCH ROLLER #9 GUIDE POST
GUIDE ROLLER "S"
GUIDE ROLLER "T" #8 GUIDE POST
ACE HEAD #3 GUIDE POST CAPSTAN SHAFT
MAIN BASE
Fig. 2-2 Tape Travel Diagram Samsung Electronics 2-1
Alignment and Adjustment
2-2 Tape Transport System Adjustment
When parts are replaced, perform the required adjustments by referring to procedures for the tape transport system. If there are any changes to the tape path, first run a T-120 tape and make sure excessive tape wrinkle does not occur at the tape guides. 1) If tape wrinkle is observed at the guide roller S, T, turn the guide roller S, T until wrinkle disappears. 2) If the tape wrinkle is still observed at the tape guide, perform the tilt adjustment of the ACE head. (See page 5-3 of the Service Manual for Test Point Locations.)
2-2-1(b) ACE HEAD TILT ADJUSTMENT
1) Playback a blank tape and observe the position of the tape at the lower flange of tape guide. 2) Confirm that there is no curl or wrinkle at the lower flange of tape guide as shown in Fig. 2-5 (B). 3) If a curl or wrinkle of the tape occurs, slightly turn the screw (A) tilt adjust on the ACE head assÕy. 4) Reconfirm the ACE head height.
(A) (B)
2-2-1 ACE Head Assembly Adjustment
2-2-1(a) ACE HEAD HEIGHT ADJUSTMENT
1) Run the alignment tape (Color bar) in the playback mode. 2) Observe surface of the audio head using a dental mirror. 3) Turn screw (C) clockwise or counterclockwise until the gap of lower tape edge and the lower edge of the control head is about 0.25mm. (Refer to Fig. 2-3 and 2-4)
WRINKLE
(BAD)
(GOOD)
Fig. 2-5 Tape Guide Check
2-2-1(c) AUDIO AZIMUTH ADJUSTMENT
1) Load alignment tape (Mono scope) and playback the NTSC : 7KHz (PAL : 6KHz) signal. 2) Connect channel-1 scope probe to audio output test point. 3) Adjust screw (B) to achieve maximum audio level. (See Fig. 2-3)
SCREW (A) TLIT ADJUST
SCREW (C) HEIGHT ADJUST
X-POSITION ADJUSTING SLIT SCREW (B) AZIMUTH ADJUST
SCREW (D) X-POSITION LOCKING
2-2-1(d) ACE HEAD POSITION (X-POINT) ADJUSTMENT
1) See page 5-1 of the Service Manual for ACE Head position (X-Point) adjustment.
Fig. 2-3 Location of ACE Head Adjustment Screw
AUDIO HEAD VIDEO HEAD
0 ~ 0 .25 mm CONTROL HEAD
Fig. 2-4 ACE Head Height Adjustment
2-2
Samsung Electronics
Alignment and Adjustment
2-2-2 Linearity adjustment (Guide roller S, T adjustment)
1) Playback the Mono Scope alignment tape (SP mode). 2) Observe the video envelope signal on an oscilloscope (triggered by the video switching pulse). 3) Make sure the video envelope waveform (at its minimum) meets the specification shown in Fig. 2-6. If it does not, adjust as follows : Note : a=Maximum output of the video RF envelope. b=Minimum output of the video RF envelope at the entrance side. c=Minimum output of the video RF envelope at the center point. d=Maximum output of the video RF envelope at the exit side. 4) If the section A in Fig. 2-7 does not meet the specification, adjust the guide roller S up or down. 5) If the section B in Fig. 2-7 does not meet the specification, adjust the guide roller T up or down.
b a c d
abcd c,b,d/a
63%
Fig. 2-6 Envelope Waveform Adjustment
H'D SWITCHING PULSE A B
ENVELOPE
A
B
Fig. 2-7 Adjustment Points
6) Play back the Mono Scope alignment tape (SP mode). 7) Connect an oscilloscope CH-1 to the Envelope and CH-2 to the HÕD SW Pulse for triggering. 8) Turn the guide roller heads with a flat head ( ) driver to obtain a flat video RF envelope as shown in Fig. 2-8.
IDEAL ENVELOPE
S HEIGHT TOO HIGH
S HEIGHT TOO LOW
T HEIGHT TOO HIGH
T HEIGHT TOO LOW
GUIDE ROLLER S
GUIDE ROLLER T
Fig. 2-8 Guide Roller S, T Height Adjustment Samsung Electronics 2-3
Alignment and Adjustment
2-2-3 Check Transitional Operation from RPS to Play
Check transition from RPS mode to play mode : Using a pre-recorded SP tape, make sure the entry side of envelope comes to an appropriate steady state within 3 seconds (as shown in Fig. 2-9). If the envelope waveform does not reach specified peak-to peak amplitude within 3 seconds, adjust as follows : 1) Make sure there is no gap between the supply roller lower flange and the tape. If there is a gap, adjust the supply guide roller again. 2) Change operation mode from the RPS to the play mode (again) and make sure the entry side of envelope rises within 3 second.
ENTRANCE SIDE ENVELOPE
2-2-4 Envelope Check
1) Make recordings on T-120 (E-120) and T-160 (E-180) tape. Make sure the playback output envelope meets the specification as shown in Fig. 2-10. 2) Play back a self recorded tape (recording made on the unit using with T-120 (E-120). The video envelope should meet the specification as shown in Fig. 2-10. In SP mode, (A) should equal (B). If the head gap is wide, upper cylinder should be checked.
A B
Fig. 2-10 Envelope Output and Output Level
2-2-5 Tape Wrinkle Check
1) Run the T-160 (E-180) tape in the playback, FPS, RPS and Pause modes and observe tape wrinkle at each guide. 2) If excessive tape wrinkle is observed, perform the following adjustments in Playback mode : Fig. 2-9 Video Envelope Rising when Operation mode Changes from RPS to Play Mode 3 Tape wrinkle at the guide roller S, T section : Linearity adjustment. 3 Tape wrinkle at tape guide flange : ACE head assembly coarse adjustment.
2-3 Reel Torque
1) The rotation of the capstan motor causes the Holder Clutch AssÕy to rotate through the Belt Pulley. 2) The spring wrap PLAY/REV of holder clutch assÕy drives the disk reel S, T through gear idle by rotation of gear center assÕy. 3) Brake is operated by slider cam at FF/REW mode. 4) Transportation of accurate driving force is done by gears. (Gear Center AssÕy) Note : If the spec. does not meet the followings specifications, replace the holder clutch assÕy and then recheck. MODE PB RPS TORQUE g/cm NTSC PAL 82.5 ± 27.5 79 ± 27 145 ± 30 Cassette Torquemeter GAUGE Cassette Torquemeter
2-4
Samsung Electronics
Alignment and Adjustment
2-4 Location adjustment and Confirmation of Tension Post
1) Remove the holder cassette assÕy and then push the lever FL Arm-R to the direction of loading. 2) Push the lever tension drive OE in the direction of arrow. (See Fig. 2-11) 3) Turn the gear worm wheel ´ clockwise so that ÒTiming PointÓ of the slider FL drive and gear FL cam ¨ can be aligned (See Fig. 2-12) 4) As rotating Disk S Reel OE clockwise and the region of adjusting in the Main Base (in shape of slit) clockwise or counterclockwise after inserting screw driver in the slit on Main Base. Adjust the left end edge of Lever Tension AssÕy to 1.3 +1.5/-0.5mm from the location of mark in the Main Base. 5) As rotating Disk S Reel OE, double-check the location of the left end edge of Lever Tension AssÕy and the quantity of crossing from mark on Main Base. (+1.0/-0.5mm) Counterclockwise : Torque UP Clockwise : Torque DOWN Back Tension should be 56 ± 15g.cm at inspecting it with Back Tension Meter.
1.0mm 1.3 0.5mm
LEVER TENSION OE LEVER TENSION DRIVE
Fig. 2-11
¨ GEAR FL CAM
LEVER TENSION ASS'Y
TIMING POINT SLIDER FL DRIVE ´ GEAR WORM WHEEL OE DISK S REEL
Fig. 2-12
Samsung Electronics
P
´ ADJUSTING ADJUSTING SLIT
Fig. 2-13 Tension Pole and Back Tension Adjustment Note : 1) Mark on Main Base is located in about 1.3mm from inside of bending line. 2) Be careful not to deform the region of adjusting on Main Base up and down at adjusting.
2-5
Alignment and Adjustment
MEMO
2-6
Samsung Electronics