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D33
English
SERVICE MANUAL
VIDEO MECHANISM TYPE P2 LRN106A P4 LRN133A
S/M Code No. 09-99B-336-8N2
DA TA
REMOVING CASSETTE MANUALLY
1. Remove the loading motor. 3. Turn the capstan belt to take up slack tape.
Loading motor
Capstan belt Fine rod, etc.
Fig. 1
Fig. 3
2. Turn the gear connect in the direction of the arrow with you finger to perform unsledding.
4. Turn the gear connect in the direction of the arrow with you finger to perform unloading.
Gear connect
Fig. 2
3
DECK MECHANISM PARTS LOCATIONS
· Top View
Pracedure Starting No.
Part
Drum Assembly Plate Assembly Top Holder Assembly CST Guide CST Bracket Side (L) Bracket Assembly Door Arm Assembly F/L Lever Assembly S/W Arm Assembly Cleaner
Fixing Type
Figure
A-2 A-2 A-2 A-2 A-2 A-2 A-2 A-3 A-3 A-4 A-4 A-4 A-4 A-4
1 2
Bracket Side 'L' 5 6 Bracket Assembly Door Plate Assembly 2 Top 7 Arm Assembly F/L Opener Door Lever Assembly 8 S/W
3 Screws , Cap FPC A-1 Two Hooks Chassis Hole 2 Hooks 1 Screw 1 Screw Chassis Hole Chassis Hole 2 Hooks 1 Screw Chassis Hole Chassis Hole Chassis Hole Chassis Shaft Chassis Shaft
2 2,3,4 2,3,4 2,3,4,5,6 2,3,4,5
3 4 5 6 7 8 9
4 Guide CST 3 Holder Assembly CST
Chassis Embossing A-3
10 Head F/E 11 Base Assembly A/C Head
9 Arm Assembly Cleaner Head F/E 10 34 Bracket Assembly L/D Motor 11 Base Assembly A/C Head 21 Arm Assembly Pinch 19 Opener Lid Support CST 17 Base Assembly P2 42 Brake Spring S Brake Assembly S 12 Arm Assembly 14 Tension Band Assembly Tension Reel S 15 Lever Assembly S/W 8 18 Base Assembly P4 41 Base Assembly P3 20 Arm Assembly T/Up 43 Arm Assembly ldler Jog 16 Reel T 13 Brake Assembly T Brake Spring T
12 Brake Assembly S 2,3 2,3,12, 2,3,13 13 Brake Assembly T 14 Arm Assembly Tension 16 Reel T 17 Support CST 18 Base Assembly P4 19 Opener Lid 19 19 20 Arm Assembly T/Up 21 Arm Assembly Pinch
Drum Assembly 1
2,3,12,14 15 Reel S
Chassis Embossing A-5 Chassis Embossing A-5 Chassis Embossing A-5 Chassis Embossing A-5 Chassis Shaft A-5
· Bottom View
Pracedure Starting No.
Part
Belt Capstan Motor Capstan Clutch Assembly D33 Lever F/R Gear Assembly H-Up/D Bracket Assembly Jog Guide Rack F/L Gear Rack F/L Brake Assembly Capstan Gear Drive Gear Cam Gear Connector Bracket Assembly L/D Motor Gear Sector BaseTension Plate Slider
Fixing Type
3 Screws 1 Washer 1 Hook 2 Washers 1 Screw 1Screw Chassis Shaft 1 Washer Chassis Shaft Chassis Shaft 3 Hooks 3 Washers 1 Screw Chassis Shaft
Figure
A-6 A-6 A-6 A-6 A-6 A-7 A-7 A-7 A-7 A-8 A-8 A-8 A-8 A-9 A-9 A-9
Motor Capstan 23 Gear Connector 33 Gear Cam 32 Brake Assembly 30 Capstan Belt Capstan 22 Gear Drive 31 Guide Rack F/L 28 Gear Rack F/L 29 Clutch Assembly D33 24 Lever F/R 25
39 Gear Assembly P3
40 Gear Assembly P2 36 Base Tension 35 Gear Sector 38 Lever Tension 37 Plate Slider 27 Bracket Assembly Jog
26 Gear Assembly H-Up/D
NOTE : When reassembly perform the procedure in the reverse order.
1) When reassembling, confirm Mechanism and Mode Switch Alignment Position (Pefer to Page 17) 2) When disassembling, the Parts for Starting No. Should be removed first.
22 23 24 22,24 25 22,24 26 27 28 28 29 28, 29 30 28, 29 31 28, 29, 30 32 28, 29, 30, 31 33 34 35 36 22, 24, 25, 27 37 28, 29, 31, 35 36 22, 24, 25, 27 28, 29, 31, 35 38 36 35 39 35, 39 40 35, 39, 40 41 35, 39, 40, 41 42 1, 2 43 22
Lever Tension Gear Assembly P3 Gear Assembly P2 Base Assembly P3 Base Assembly P2 Arm Assembly Idler Jog
Chassis Hole 2 Hooks 2 Hooks Chassis Hole Chassis Hole 1 Hook
A-9 A-10 A-10 A-10 A-10 A-10
4
DECK MECHANISM DISASSEMBLY
(S2) (S2) (S3) Drum Motor (S3) Rotor Stator
Drum Sub Assembly
(Fig. A-1-1)
Drum FPC
(S1) Optional Parts Holder FPC or
(only for 2HD Models)
(S1) or Holder FPC
(S1)
Holder FPC
(only for 4HD-Mono Models)
(only for 4HD-Hi-Fi Models)
H1 Cap FPC
(Fig. A-1-1)
Fig. A-1 1. Drum Assembly (Fig. A-1-1)
1) Unhook the (H1) on the back side of the Chassis and separate the Cap FPC. 2) Remove three Screws (S1) and lift up the Drum Assembly. 3) Remove two Screws (S2) and Separate the Stator of Drum Motor. 4) Remove two Screws (S3) and Separate the Rotor of Drum Motor from the Drum Sub Assembly.
(Fig. B-1)
Cap FPC
Drum FPC
NOTE
(1) When reassembling Cap FPC, two Holes of Drum FPC are inserted to the two Bosses of Holder FPC correctly. (Refer to Fig. B-1)
Holder FPC
Figure in the opposite direction
5
DECK MECHANISM DISASSEMBLY
H1
H2 Plate Assembly Top (A) (B)
(Fig. A-2-1)
Lever Stopper (L) Holder Assembly CST
Lever Stopper (R)
(Fig. A-2-2)
Arm Assembly F/L
(Fig. A-2-6)
Lever Assembly S/W (H5) (S1)
Arm F/L
(S2)
(Fig. A-2-7)
Bracket Side (L)
(Fig. A-2-4)
Groove Gear Rack F/L Groove Guide CST
(Fig. A-2-5)
Bracket Assembly Door
(Fig. A-2-3)
H3 H4
Fig. A-2
6
DECK MECHANISM DISASSEMBLY
2. Plate Assembly Top (Fig. A-2-1)
1) Unhook the (H1) and separate the Left Side. 2) Unhook the (H2) and lift up the Plate Assembly Top. 2) Remove the Screw (S2) and disassemble the Bracket Assembly Door in the front.
6. Arm Assembly F/L (Fig. A-2-6)
1) Push the Arm Assembly F/L to the left and lift up it.
NOTE
(1) When reassembling, confirm (A),(B) Part of the Plate Assembly Top is inserted to the (L),(R) Grooves of the Bracket Side(L) and Bracket Assembly Door.
NOTE
(1) When reassembling, confirm that the Gear(A) of the Arm F/L and the Gear(B) of the Gear Rack F/L are assembled as below.
3. Holder Assembly CST (Fig.A-2-2)
1) Push the Lever Stopper(L),(R) in the direction of the arrows (A), (B), and move the Holder Assembly CST.
Plate Assembly Top
7. Lever Assembly S/W (Fig. A-2-7)
Gear (A)
Bracket Side (L)
Bracket Assembly Door
Gear (B)
2) Push the Bracket Assembly Door to the right and lift up the Holder Assembly CST along the Guide Groove of the Bracket Assembly Door.
Lever Stopper (R)
1) Hook the Spring Lever S/W on (H5). 2) Lift up the left side of the Lever S/W from the Groove(A) of the Chassis.
Lever Stopper (L) Holder Assembly CST
(A)
(B)
Spring Lever S/W (H5)
4. Guide CST (Fig.A-2-3)
1) Push two Hooks(H3),(H4) in the direction of the arrow and separate the left side. 2) Unhook (H5),(H6) as above No.1) and disassemble the Guide CST in the direction of the arrow.
(H5)
NOTE
(1) Place the Spring Lever S/W of the above (No.1) as original position.
(H4) (H3) Bracket Side (L) Bracket Assembly Door (H5) (H5) Spring Lever S/W
5. Bracket Side(L) (Fig. A-2-4)/ Bracket Assembly Door (Fig.A-2-5)
1) Remove the Screw (S1) and disassemble the Bracket Side(L) in the front.
7
DECK MECHANISM DISASSEMBLY
Arm Assembly Cleaner
(A)
(Fig. A-3-1)
(S1) Base Assembly A/C Head
(H1)
(Fig. A-3-2)
(Fig. A-3-3)
Head F/E
Fig. A-3 8. Arm Assembly Cleaner(Fig. A-3-1)
1) Break away the (A) part shown above Fig. A-3-1 from the Embossing of the Chassis in the clockwise direction and lift up the Arm Assembly Cleaner.
9. Head F/E (Fig. A-3-2)
1) Unhook the two Hooks (H1) on the back side of the Chassis and lift up the Head F/E.
10. Base Assembly A/C Head (Fig. A-3-3)
1) Remove the Screw (S1) and lift up the Base Assembly A/C Head.
8
DECK MECHANISM DISASSEMBLY
Spring S Brake Brake Assembly S (A) Arm Assembly Tension Spring Tension (C) Reel T
(Fig. A-4-1)
(Fig. A-4-5) (Fig. A-4-3)
Band Assembly Tension Reel S
Spring T Brake B
Brake Assembly T
(Fig. A-4-4)
(Fig. A-4-2)
Fig. A-4 11. Brake Assembly S (Fig. A-4-1)
1) Remove the Spring S Brake. 2) Hold the (A) part shown above Fig. A-4-1 and turn to the clockwise direction, and then lift up the Brake Assembly S.
13. Arm Assembly Tension (Fig. A-4-3)
1) Remove the Spring Tension. 2) Hold the (C) part shown above Fig. A-4-3 and turn to the clockwise direction, and then lift up the Arm Assembly Tension.
NOTE
(1) When reassembling, be careful not to change the Spring with below No.12.(Refer to Fig. B-2).
NOTE
(1) When reassembling, be careful not to change the Spring with above No.11,12.(Refer to Fig. B-2).
12. Brake Assembly T (Fig. A-4-2)
1) Remove the Spring T Brake. 2) Hold the (B) part shown above Fig. A-4-2 and turn to the counterclockwise direction, and then lift up the Brake Assembly T.
14. Reel S (Fig. A-4-4) & Reel T (Fig. A-4-5)
1) Lift up the Reel S and Reel T.
NOTE
(1) When reassembling, be careful not to change the Reel S and Reel T each other.
Three Holes
NOTE
(1) When reassembling, be careful not to change the Spring with above No.11.(Refer to Fig. B-2). (Difference for Springs)
(Fig. B-2) Reel S Reel T
Spring T Brake Color (Black) Spring S Brake Spring Tension
(2) Confirm two Slide Washers under the Reel S and Reel T.
9
DECK MECHANISM DISASSEMBLY
(D)
Opener Lid
(Fig. A-5-3)
(C)
Spring Arm T/Up Arm Assembly T/up
(Fig. A-5-4)
Arm Assembly Pinch
Base Assembly P4 Support CST
(Fig. A-5-5)
(Fig. A-5-1)
(A)
(B)
(Fig. A-5-2)
Fig. A-5 15. Support CST (Fig. A-5-1)
1) Break away the (A) part shown above Fig. A-5-1 from the Embossing of the Chassis in the clockwise direction, and lift up the Support CST. 2) Lift up the Arm Assembly T/up.
NOTE
(1) When reassembling, unhook the Spring Arm T/up Shown above (No.17.1) to the original position.
Opener Lid
16. Base Assembly P4 (Fig. A-5-2)
1) Break away the (B) part shown above Fig. A-5-2 from the Embossing of the Chassis in the counterclockwise direction and lift up the Base Assembly P4.
17. Opener Lid (Fig. A-5-3)
1) Hook the Spring Arm T/up on the Split digged under the Arm Assembly T/up.(Refer to Fig.A-5-4(D)). 2) Break away the (C) Part of the Opener Lid from the Embossing of the Chassis in the Clockwise direction and lift up the Opener Lid.
Spring Arm T/up
Arm Assembly T/up
18. Arm Assembly T/up (Fig. A-5-4)
1) Confirm that the Spring Arm T/up is placed as above (No.17.1).
19. Arm Assembly Pinch (Fig. A-5-5)
1) Lift up the Arm Assembly Pinch.
10
DECK MECHANISM DISASSEMBLY
(Fig. A-6-1)
(B) (A)
Belt Capstan
Motor Capstan
Washer(W1) Clutch Assembly D33
(Fig. A-6-2)
(Fig. A-6-3)
Washer(W2) Optional Parts
Lever F/R
Gear Assembly H-Up/D or Gear Assembly Up/D
(For Hi-Rewind Models) (For Normal Models)
(Fig. A-6-4)
Hook(H1) (C)
Spring Up/D Slide Washer
(Fig. A-6-5)
(B') (A')
(S1)
Fig. A-6 20. Belt Capstan (Fig. A-6-1)/ Motor Capstan (Fig. A-6-2)
1) Remove the Belt Capstan. 2) Remove three Screws(S1) on the back side of the Chassis and lift up the Motor Capstan.
NOTE
(1) When reassembling, move the (C) part of the Lever F/R up and down, then confirm if it is returned to original position.
NOTE
(1) When reassembling, Confirm the (A), (B) parts of Motor Capstan is located to the (A'), (B') of the Chassis.
23. Gear Assembly H-Up/D or Gear Assembly Up/D (Fig. A-6-5)
1) Remove the Washer(W2) and lift up the Gear Assembly H-up/D. 2) Remove the Spring Up/D. 3) Remove the Slide Washer.
21. Clutch Assembly D33 (Fig. A-6-3)
1) Remove the Washer(W1) and lift up the Clutch Assembly D33.
NOTE
(1) Gear Assembly H-Up/D is for Hi-Rewind Models. (2) Gear Assembly Up/D is for Normal Models except Hi-Rewind Models.
22. Lever F/R (Fig. A-6-4)
1) Unhook the (H1) shown above Fig. A-6-4 and lift up the Lever F/R.
11
DECK MECHANISM DISASSEMBLY
Brake Assembly Capstan
Hole (A)+(B)
Brake Assembly Capstan Gear Cam Hole (A) (H1) (H2) Spring Capstan Guide Rack F/L (S2)
(Fig. A-7-4)
(S1) Bracket Assembly Jog
(Fig. A-7-2)
Gear Rack F/L Gear Cam
(Fig. A-7-1)
Hole (B)
(Fig. A-7-3)
Fig. A-7 24. Bracket Assembly Jog (Fig. A-7-1)
1) Remove the Screw(S1) and lift up the Bracket Assembly Jog.
Hook(H2)
25. Guide Rack F/L (Fig. A-7-2)/ Gear Rack F/L (Fig. A-7-3)
1) Remove the Screw(S2) and lift up the Guide Rack F/L. 2) Lift up the Gear Rack F/L.
Hook(H2)
26. Brake Assembly Capstan (Fig. A-7-4)
1) Hook the Spring Capstan on the Hook(H1). 2) Unhook the Hook(H2) and lift up the Brake Assembly Capstan.(Refer to Fig. to the right)
NOTE
(1) When reassembling, confirm that the Hole(A) of the Brake Assembly Capstan is aligned to the Hole(B) of the Gear Cam. (Refer to above Fig. A-7-4).
12
DECK MECHANISM DISASSEMBLY
Washer (W1) Gear Drive
(Fig. A-8-1)
Hole(B)
Gear Cam
(Fig. A-8-2)
Gear Connector Hole(A)
(Fig. A-8-3)
Hole(A')+(A)
Gear Connector
Hole(B')
Hole(A')
Chassis
H1 Bracket Assembly L/D Motor Hole(B')+(B) H2
(Fig. A-8-4)
Gear Cam
Fig. A-8 27. Gear Drive (Fig. A-8-1)/ Gear Cam (Fig. A-8-2)/ Gear Connector (Fig. A-8-3)
1) Remove the Washer(W1) and lift up the Gear Drive. 2) Lift up the Gear Cam. 3) Lift up the Gear Connector.
(Fig. B-3)
Gear Cam (C)
Gear Drive (D)
NOTE
(1) When reassembling, confirm that the Hole (A) of the Gear Connector is aligned to the Hole (A') of the Chassis (Fig. A-8-3). (2) When reassembling, confirm that the Hole (B) of the Gear Cam is aligned to the Hole (B') of the Chassis (Fig. A-8-2). (3) When reassembling, confirm that the (C) part of the Gear Cam is aligned to the (D) part of the Gear Drive as shown Fig. B-3
28. Bracket Assembly L/D Motor (Fig. A-8-4)
1) Unhook the three Hooks(H1),(H2) and push down the Bracket Assembly L/D Motor.
Hook (H1), (H2) Chassis
13
DECK MECHANISM DISASSEMBLY
(W1) Washer
Gear Sector
(Fig. A-9-1)
( S1)
Plate Slider
Base Tension
(Fig. A-9-3)
(Fig. A-9-2)
Lever Tension
(Fig. A-9-4)
(A)
Fig. A-9 29. Gear Sector (Fig. A-9-1)
1) Remove the Washer(W1) and lift up the Gear Sector.
NOTE
(1) When reassembling, turn the Lever Tension to the clockwise direction in maximum.
30. Base Tension (Fig. A-9-2)/ Plate Slider (Fig. A-9-3)/ Lever Tension (Fig. A-9-4)
1) Remove the Screw(S1) and lift up the Base Tension. 2) Lift up the Plate Slider. 3) Hold the (A) Part of the Lever Tension and turn to the counterclockwise direction, and then lift up the Lever Tension.
14
DECK MECHANISM DISASSEMBLY
(Fig. A-10-1)
Gear Assembly P3
H1
Gear Assembly P3
H2
Gear Assembly P2
(Fig. A-10-2)
(A) (B)
Gear Assembly P2
(A) (B)
Chassis
Optional Parts Arm Assembly Idler or Arm Assembly Idler Jog (For 2HD Models) (For 4HD Models) Base Assembly P2
(Fig. A-10-4)
(Fig. A-10-5)
(H3)
(Fig. A-10-3)
Base Assembly P3
Fig. A-10 31. Gear Assembly P3 (Fig. A-10-1)/ Gear Assembly P2 (Fig. A-10-2)
1) Unhook the two Hooks(H1) and lift up the Gear Assembly P3. 2) Unhook the two Hooks(H2) and lift up the Gear Assembly P2.
NOTE
1) Arm Assembly Idler Jog is for 4HD Models. 2) Arm Assembly Idler is for 2HD Models.
NOTE
32. Base Assembly P3 (Fig. A-10-3)/ Base Assembly P2 (Fig. A-10-4)
1) Move the Base Assembly P3 in the direction of the arrow of the Chassis Hole(A) and push down the Base Assembly P3. 2) Move the Base Assembly P2 in the direction of the arrow of the Chassis Hole(B) and push down the Base Assembly P2.
1) When reassembling, confirm that the (A) Part of the Gear Assembly P3 is aligned to the (B) Part of the Gear Assembly P2 as shown below.
Gear Assembly P3
33. Arm Assembly Idler Jog or Arm Assembly Idler (Fig. A-10-5)
1) Unhook the Hook(H3) and push down the Arm Assembly Idler Jog.
(Unloading Condition)
(A) (B)
Gear Assembly P2
15
DECK MECHANISM ADJUSTMENT
· Tools and Fixtures for Service
1. Cassette Torque meter 1. SRK-VHT-303(Not SVC part) 2. Alignment tape (See figure below) 3. Torque gauge 3. 600g.Cm ATG
SR K
-V
HT
-S
300
250 200 150
0 50
VID CAS EO S TOR ETTE Q MET UE VHT ER -303
SR
K
K - V H T 0T SR 50 100 150
200
300
250
4. Torque gauge adaptor
5. Post height adjusting driver Parts No: SV-TGO-030-000 (SMALL) SV-TGO-020-000 (LARGE)
6. + Type driver (ø 5)
ALIGNMENT TAPES FOR ADJUSTMENT
Derivation No. Mechanism Adjustment ltems FM Envelope Slantness A/C Head Height Azimuth X-value RG Post lnclination Tape Back Tension TTV-P1 (TTV-P1L) TTV-P2 TTV-P2 (TTV-P2L) TTV-P1 TTV-P2 TTV-P2 A PAL SP/LP 2/4 Head TTV-P2L B PAL SP 2 Head TTV-P2 C NTSC SP/LP/EP 2/4 Head TTV-N1 (TTN-N12) D NTSC SP 2 Head TTV-N2
A commercially available tape TTV-N1 (TTV-N12) (TTV-N1E) TTV-N2 TTV-N2 TTV-N2E TTV-N12 TTV-N1 (TTV-N12) TTV-N2 TTV-N2
A commercially available tape SRK-VHT-303
The numbers in ( ) parenthesis can be used as the substiture.
16
DECK MECHANISM ADJUSTMENT
1.Mechanism Alignment Position Check
Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected.
Test Equipment/ Fixture · Blank tape Test Conditions (Mechanism Condition) · Eject Mode (with Cassette ejected) Check Point · Mechanism and Mode Switch Position
1) Turn the Power S/W on and eject the Cassette by pressing the Eject Button. 2) Remove the Top Cover and Plate Assembly Top, visually check if the Gear Cam Hole is aligned with the Chassis Hole as below Fig. C-2. 3) IF not, rotate the Shaft of the Loading Motor to either Clockwise or Counterclockwise until the Alignment is as below Fig. C-2. 4) Remove the Screw which fixes the Deck Mechanism and Main Frame and confirm if the Gear Cam is aligned
with the Gear Drive as below Fig. C-1(A). 5) Confirm if the Mode S/W on the Main P.C.Board is aligned as below Fig. C-1(B). 6) Remount the Deck Mechanism on the Main P.C.Board and check each operation.
CHECK DIAGRAM
Mode S/W Gear Cam
(B) (A)
Gear Drive
Gear Cam (o) and Gear Drive (o) groove alignment
BOTTOM VIEW Fig. C-1
L/D Motor Assembly Gear Cam
Chassis Hole Gear Cam Hole
TOP VIEW Fig. C-2
17
DECK MECHANISM ADJUSTMENT
2. Preparation for Adjustment (To set the Deck Mechanism to the Loading state without inserting a Cassette Tape).
1) 2) 3) 4) Unplug the Power Cord from the AC Outlet. Disassemble the Top Cover and Plate Assembly Top. Plug the Power Cord into the AC Outlet. Turn the Power S/W on and push the Lever Stopper (L),(R) of the Holder Assembly CST to the back for Loading the Cassette without Tape. Cover the Holes of the End Sensors at the both sides of the Bracket Side(L) and Bracket Assembly Door to prevent a light leak. Then The Deck Mechanism drives to the Stop Mode. In this case, The Deck Mechanism can accept inputs of each mode, however the Rewind and Review Operation can not be performed for more than a few seconds because the Take-up Reel Table is in the Stop State and can not be detected the Reel Pulses.
3. Checking Torque
Purpose: To insure smooth Transport of the Tape during each Mode of Operation. If the Tape Transport is abnormal, then check the Torque as indicated by the chart below.
Test Equipment/ Fixture
· Torque Gauge(600g/cm ATG) · Torque Gauge Adaptor · Cassette Torque Meter SRK-VHT-303
Test Conditions (Mechanism Condition)
Checking Method
· Play (FF) or Review (REW) Mode · Perform each Deck Mechanism Mode without inserting a Cassette Tape(Refer to above No.2 Preparation for Adjustment). · Read the Measurement of the Take-up or Supply Reels on the Cassette Torque Meter(Fig. C-3-2). · Attach the Torque Gauge Adaptor to the Torque Gauge and then read the Value of it(Fig. C-3-1). Mode Test Equipment Cassette Torque Gauge Cassette Torque Gauge Cassette Torque Meter Cassette Torque Meter Measurement Reel Take-Up Reel Supply Reel Take-Up Reel Supply Reel Measurement Values More than 400g/cm More than 400g/cm 75~115g/cm 130~200g/m
Item Fast Forward Torque Rewind Torque Play Take-Up Torque Review Torque
Fast Forward Rewind Play Review
NOTE:
The Values are measured by using a Torque Gauge and Torque Gauge Adaptor with the Torque Gauge affixed.
NOTE:
The Torque reading to measure occurs when the Tape abruptly changes direction from Fast Forward of Rewind Mode, when quick bracking is applied to both Reels.
· Cassette Torque Meter (SRK-VHT-303)
· Torque Gauge (600g.cm ATG)
Torque Gauge
SR K
-V
H
S T-
300
250 200 150
0 50
VID CAS EO S TOR ETTE Q MET UE VHT ER -303
SR K
K - V H T 0T SR 50 100 150
Torque Gauge Adaptor
200
300
250
Reel Table
Fig. C-3-2 Fig. C-3-1
18
DECK MECHANISM ADJUSTMENT
4.Guide Roller Height Adjustment
Purpose: To regulate the Height of the Tape so that the Bottom of the Tape runs along the Tape Guide Line on the Lower Drum.
4-1. Preliminary Adjustment Test Equipment/ Fixture
· Post Height Adjusting Driver
Test Conditions (Mechanism Condition)
· Play or Review Mode
Adjustment Point
· Guide Roller Height Adjustment screws on the Supply and Take-Up Guide Rollers.
Guide Roller Height Adjustment screw Upper Flange Guide Roller Retaining Screw
Adjustment Procedure
1) Confirm if the Tape runs along the Tape Guide Line of the Lower Drum. 2) If the Tape runs the Bottom of the Guide Line, turn the Guide Roller Height Adjustment Screw to Clockwise direction. 3) If it runs the Top, turn to Counterclockwise direction. 4) Adjust the Height of the Guide Roller to be guided to the Guide Line of the Lower Drum from the Starting and Ending Point of the Drum.
ADJUSTMENT DIAGRAM
Fig. C-4-1
4-2. Precise Adjustment Test Equipment/Fixture
· Oscilloscope · Alignment Tape · Post Height Adjusting Driver
Test Equipment Connection Points
· CH-1:PB RF Envelope · CH-2:NTSC: SW 30Hz PAL: SW 25Hz · Head Switching Output Point · RF Envelope Output Point
Test Conditions VCR(VCP) State
· Play an Alignment Tape
Adjustment Point
· Guide Roller Height Adjustment Screws
Waveform Diagrams
P2 POST ADJUSTMENT
Adjustment Procedure
1) Play an Alignment Tape after connecting the Probe of the Oscilloscope to the RF Envelope Output Test Point and Head Switching Output Test Point. 2) Tracking Control(in PB Mode) : Center Position(When this Adjustment is performed after the Drum Assembly has been replaced, set the Tracking Control so that the RF Output is Maximum). 3) Height Adjustment Screw : Flatten the RF Waveform. (Fig. C-4-2) 4) Turn(Move) the Tracking Control(in PB Mode) Clockwise and Counterclockwise.(Fig. C-4-3) 5) Check that any Drop of RF Output is uniform at the Start and End of the Waveform.
P3 POST ADJUSTMENT
Turn the Roller Guide Height Adjustment Screw slightly to flatten the waveform.
Fig. C-4-2
Tracking control at center
Turn(Move) the tracking control to both directions
Fig. C-4-3 Connection Diagram
OSCILLOSCOPE
NOTE
If the adjustment is excessive or insufficient the tape will jam or fold.
RF ENVELOPE OUTPUT TEST POINT HEAD SWITCHING OUTPUT TEST POINT
19
DECK MECHANISM ADJUSTMENT
5. Audio/Control (A/C) Head Adjustment
Purpose: To insure that the Tape passes accurately over the Audio and Control Tracks in exact Alignment in both the Record and Playback Modes.
5-1. Preliminary Adjustment (Height and Tilt Adjustment) Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape. Test Equipment/ Fixture
· Blank Tape · Screw Driver(+) Type 5mm
Test Conditions (Mechanism Condition)
· Play the blank tape
Adjustment Point
· Tilt Adjustment Screw(C) · Height Adjustment Screw(B) · Azimuth Adjustment Screw(A)
Adjustment Procedure/Diagrams
1) Initially adjust the Base Assembly A/C Head as shown Fig. C-5-1 by using the Height Adjustment Screw(B). 2) Play a Blank Tape and observe if the Tape passes accurately over the A/C Head without Tape Curling or Folding. 3) If Folding or Curling is occured then adjust the Tilt Adjustment Screw(C) while the Tape is running to resemble Fig. C-5-3. 4) Reconfirm the Tape Path after Playback about 4~5 seconds.
NOTE
Ideal A/C head height occurs, when the tape runs between 0.2~0.25mm above the bottom edge of the A/C head core.
A/C Head
-0.05
Tape P4 Tape 0.2~0.25mm
10.9
A/C Head Base Fig. C-5-1 Fig. C-5-3
X-Value Adjustment Hole
Fixed Screw
Azimuth Adjustment Screw(A)
Tilt Adjustment Screw(C) Height Adjustment Screw(B)
A/C Head Assembly Fig. C-5-2
20
DECK MECHANISM ADJUSTMENT
5-2. Confirm that the Tape passes smoothly between the Take-up Guide and Pinch Roller(using a Mirror or the naked eye).
1) Afetr completing Step 5-1.(Preliminary Adjustment), check that the Tape passes around the Take-up Guide and Pinch Roller without Folding or Curling at the Top or Bottom. (1) If Folding or Curling is observed at the Bottom of the Take-up Guide then slowly turn the Tilt Adjustment Screw(C) in the Clockwise directioin. (2) If Folding or Curling is observed at the Top of it then slowly turn the Tilt Adjustment Screw(C) in the Counterclockwise direction.
NOTE:
Check the RF Envelope after adjusting the A/C Head, if the RF Waveform differs from Fig. C-5-4, performs Precise Adjustment to flat the RF Waveform.
5-3. Precise Adjustment (Azimuth adjustment)
Test Equipment/ Fixture · Oscilloscope · Alignment Tape(SP) · Screw Driver(+) Type 5mm Connection Point · Audio output jack Test Conditions (Mechanism Condition) · Play an Alignment Tape 1KHz, 7KHz Sections Adjustment Point · Azimuth Adjustment Screw(A) · Height Adjustment Screw(B)
Adjustment Procedure
1) Connect the Probe of the Oscilloscope to Audio Output Jack. 2) Alternately adjust the Azimuth Adjustment Screw(A) and the Tilt Adjustment Screw(C) for Maximum Output of the 1Khz and 7Khz segments, while maintaining the flattest Envelope differential between the two Frequencies.
1KHZ
7KHZ
A:Maximum
B:Maximum
Fig. C-5-4
6. X-Value Adjustment
Purpose: To obtain compatibility with other VCR(VCP) Models.
Test Equipment/ Fixture Connection Point Test Conditions (Mechanism Condition) · Play an Alignment Tape
Left
Adjustment Point
Groove at the Base A/C
· CH-1: PB RF Envelope · Oscilloscope · CH-2: NTSC: SW 30Hz · Alignment tape(SP only) PAL: SW 25Hz · Screw Driver(+) Type 5mm · Head Swithching Output Test Point · RF Envelope Output Test Point
Right
Adjustment Procedure
1) Insert the alignment tape, and press the + or - manual tracking (channel) button once while "AUTO TRACKING" is flashing on the screen to release auto tracking, and then center the tracking. 2) Run the tape long enough for tracking to complete one cycle. 3) Loosen the fixing screw, and move the A/C head base assembly in the direction shown in the diagram, to find the center of the peak so that the maximum envelope is available. With this method, the 31-µm head can trace on the centerof 58-µm track. 4) Tighten the A/C head base assembly fixing screw.
Adjustment Diagram
X-Value Adjustment Hole
Fixed Screw
Azimuth Adjustment Screw(A) Tilt Adjustment Screw(C) Height Adjustment Screw(B)
OSCILLOSCOPE
Connection Diagram
RF ENVELOPE OUTPUT TEST POINT
CH-1 CH-2
HEAD SWITCHING OUTPUT TEST POINT
21
DECK MECHANISM ADJUSTMENT
7. Adjustment after Replacing Drum Assembly (Video Heads)
Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum.
Test Equipment/ Fixture · Oscilloscope · Alignment tapes · Blank Tape · Post Height Adjusting Driver · Screw Driver(+) Type 5mm Connection Point · CH-1: PB RF Envelope · CH-2: NTSC: SW 30Hz PAL: SW 25Hz · Head Swithching Output Test Point · RF Envelope Output Test Point Test Conditions (Mechanism Condition) · Play the blank tape · Play an alignment tape Adjustment Points · Guide Roller Precise Adjustment · Switching Point · Tracking Preset · X-Value
Checking/Adjustment Procedure
Play a blank tape and check for tape curling or creasing around the roller guide. If there is a problem then follow the procedure 4. "Guide Roller Height" and 5. "Audio Control(A/C) Head Adjustment".
Connection Diagram
RF ENVELOPE OUTPUT TEST POINT
OSCILLOSCOPE
CH1 CH2
HEAD SWITCHING OUTPUT TEST POINT
Waveform
V1/V MAX 0.7 V2/V MAX 0.8 RF ENVELOPE OUTPUT
V1 V V2
Fig. C-7
8. Check the Tape Travel after Reassembling Deck Assembly.
8-1.Check Audio and RF Locking Time during playback and after CUE or REV (FF/REW)
Test Equipment/ Fixture · Oscilloscope · Alignment tapes(with 6H 3kHz Color Bar Signal) · Stop Watch Specification · RF Locking Time: Less than 5 sec. · Audio Locking Time:Less than 10sec Test Equipment Connection Points Connection Points · CH-1: PB RF Envelope · CH-2: Audio Output · RF Envelope Output Point · Audio Ouptut Jack Test Conditions (Mecanism Condition) · Play an alignment tape (with 6H 3kHz Color Bar Signal)
Checking Procedure
Play an alignment tape then change the operating mode to CUE or REV and confirm if the unit meets the above listed specifications.
NOTES:
1) CUE is fast forward mode (FF) 2) REV is the rewind mode (REW) 3) Referenced to the Play mode
8-2.Check for tape curling or jamming
Test Equipment/ Fixture · T-160 Tape · T-120 Tape Specification · Be sure there is no tape jamming or curling at the begining, middle or end of the tape. Test Conditions (Mecanism Condition) VCR(VCP) State · Run the CUE, REV play mode at the beginning and the end of the tape.
Checking Procedure
1) Confirm that the tape runs smoothly around the roller guides, drum and A/C head assemblies while abruptly changing operating modes from Play to CUE or REV. This is to be checked at the begining, middle and end sections of the cassette. 2) Confirm that the tape passes over the A/C head assembly as indicated by proper audio reproduction and proper tape counter performance.
22
MAINTENANCE/INSPECTION PROCEDURE
1 Check before starting repairs
The following faults can be remedied by cleaning and oiling. Check the needed lubrication and the conditions of cleanliness in the unit. Check with the customer to find out how often the unit is used, and then determine that the unit is ready for inspection and maintenance. Check the following parts.
Phenomenon Inspection Replacement o
F/E Head
Color beats
Dirt on full-erase head
Poor S/N, no color Vertical or Horizontal jitter Low volume, Sound distorted Tape does not run. Tape is slack In Review and Unloading (off mode), the Tape is rolled up loosely.
Dirt on video head Dirt on video head Dirt on tape transport system Dirt on Audio/control head
o
Video Head
o
A/C Head Pinch Roller
Fig. C-9-1 Top VIEW
o
Dirt on pinch roller Clutch Ass'y S27 Torque reduced Cleaning Drum and transport system
o
Belt Capston
o
Clutch Assembly D33
Fig. C-9-3
NOTE
If locations marked with o do not operate normally after cleaning, check for wear and replace. See the EXPLODED VIEWS at the end of this manual as well as the above illustrations See the Greasing (Page 25) for the sections to be lubricated and greased.
Fig. C-9-2 BOTTOM VIEW
* No. (1)~(13) Indicates the Tape Path to be traveled from Supply Reel to Take-up Reel.
(7) Base Assembly P3 (4) F/E Head (8) A/C Head (3) P1 Post (9) P4 Post (6) Drum Assembly (Video Head) (5) Base Assembly P2 (2) Tension Post (10) Capstan Shaft (1) Supply Reel (13) Take-up Reel (11) Pinch Roller (12) Take-up Guide Post
Fig. C-9-3 Tape Transport System
23
MAINTENANCE/INSPECTION PROCEDURE
2. Required Maintenance
The recording density of a VCR(VCP) is much higher than that of an audio tape recorder. VCR(VCP) components must be very precise, at tolerances of 1/1000mm, to ensure compatiblity with other VCRs. If any of these components are worn or dirty, the symptoms will be the same as if the part is defective. To ensure a good picture, periodic inspection and maintenance, including replacement of worn out parts and lubrication, is necessary.
4. Supplies Required for Inspection and Maintence
(1) Grease : Kanto G-311G (Blue) or equivalent (2) Isopropyl Alcohol or equivalent (3) Cleaning Patches (4) Grease : Kanto G-381(Yellow) : Used only for Reel S and Reel T
3. Scheduled Maintenance
Schedules for maintenance and inspection are not fixed because they vary greatly according to the way in which the customer uses the VCR(VCP), and the environment in which the VCR(VCP) is used. But, in general home use, a good picture will be maintained if inspection and maintenance is made every 1,000 hours. The table below shows the relation between time used and inspection period. Table 1
When inspection is necessary Average hours used per day One hour About 1 year About 18 months About 3 years
5) Maintenance Procedure 5-1) Cleaning
(1) Cleaning video head First use a cleaning tape. If the dirt on the head is too stubborn to remove by tape, use the cleaning patch. Coat the cleaning patch with Isopropyl Alcohol. Touch the cleaning patch to the head tip and gently turn the head(rotating cylinder) right and left. (Do not move the cleaning patch vertically. Make sure that only the buckskin on the cleaning patch comes into contact with the head. Otherwise, the head may be damaged.) Thoroughly dry the head. Then run the test tape. If lsopropyl Alcohol remains on the video head, the tape may be damaged when it comes into contact with the head surface. (2) Clean the tape transport system and drive system, etc, by wiping with a cleaning patch wetted with Isporopyl Alcohol.
NOTES:
1 It is the tape transport system which comes into contact with the running tape. The drive system consists of those parts which moves the tape. Make sure that during cleaning you do not touch the tape transport system with the tip of a screw driver and no that force is that would cause deforming or damage applied to the system.
Two hours
2
Three hours
Drum (Rotating Cylinder)
Cleaning Patch Head Tip Touch this section of cleaning patch to the head tip and gently turn the Drum (Rotating Cylinder)
Coat With Isopropyl Alcohol
Fig. C-9-4
24
MAINTENANCE/INSPECTION PROCEDURE
5-2) Greasing
(1) Greasing guidelines Apply grease, with a cleaning patch. Do not use excess grease. It may come into contact with the tape transport or drive system. Wipe any excess and clean with clean ing patch wetted in Isopropyl Alcohol. (2) Periodic greasing Grease specified locations every 5,000 hours.
1) Loading Path Inside & Top side 2) Shaft 3) Gear Rack F/L Moving Section 4) Shaft 5) Lever Tension Groove 6) Clutch Assembly D33 Shaft 7) Brake "S" Rubbing Section
NOTE:Greasing Points
1) Loading Path Inside & Top side 2) Base Tension Boss inside Hole 3) Arm Assembly F/L "U" Groove 4) Arm Take-up Rubbing Section 5) L/D Motor Worm Wheel Part
1 4 2
1
6) Shaft 7) Arm Assembly F/L of Buming Inside Hole 8) Reel S, T Shaft (G381:Yellow) 9) Brake T Groove
4 3 5 6 2 6 9 3 8 7 7 5
Chassis (Bottom)
Chassis (Top)
Gear Part
Side Bottom inside Bottom
Cam Part
Cam Part
Gear Sector
Gear Cam
Cam & Gear Part
Guide Rack F/L
Press
Gear Rack F/L
Cam Part
Gear Assembly Up/D Gear Drive
Stopper Part
Plate Slider (Top)
Gear Part
Cam Part
Guide Rail
Bracket Side (L)
Bracket Assembly Door
Plate Slider (Bottom)
25
MECHANISM TROUBLESHOOTING GUIDE
1.Deck Mechanism
A.
Auto REW doesn't work.
YES
Is the output of END sensor of supply side "H"? "H": more than 3.5V "L": less than 0.7V~1V
YES
NO
Is the Vcc. voltage of End sensor 5V?
NO
Check the syscon power.
YES
Replace End sensor.
Is the voltage across IR LED between 0.8~1.5V?
YES
Replace LED.
NO
Check syscon circuit.
B.
No F/R modes.
YES
Is the present mode, F/R Mode?
NO
Is the mode SW assembled correctly (refer to Page 17.)
YES NO
Does the Capstan Motor rotate? Is the normal voltage supplied to the Capstan Motor Vcc1, Vcc2.?
YES
Do the T/Up, Supply Reel rotate?
YES
Does terminal voltage(Vctl) of Capstan Motor supply side more than 4V?
NO
Check Servo, Power Circuits.
YES
Check syscon circuit.
YES
Replace the Capstan Motor.
26
MECHANISM TROUBLESHOOTING GUIDE
C.
AUTO STOP. (PLAY/CUE/REV)
Check aligment positions (page 17) Check spring Pinch. In Play/Cue/Rev is the pinch roller in contact with the capstan shaft.
NO
Is the output of DFG, DPG OK? Replace Drum Motor.
NO YES NO
Check Servo, Syscon.
YES
Are there T/up and supply reel pulses.
YES
Check the Syscon, µ-COM. Replace Reel Sensor.
D.
No cassette loading.
Insert the cassette.
YES
Does the lever S/W work normally.
NO
Check Cassette Carry Assembly.
YES
Is there variation for F/L S/W Output? (In Tape with REC Tab "L""H""L") (In Tape without REC Tab "L""H""L""H")
NO
Does the F/L S/W work normally?
NO
Replace F/L S/W.
YES YES NO
Check Syscon Circuit. Check Syscon Circuit.
27
MECHANISM TROUBLESHOOTING GUIDE
E.
In PB mode Tape Presence not sensed.
Is the Pinch Roller attached to the Capstan Motor Shaft?
NO
Check Alignment positions (page 17)
YES
Does the T/Up Reel turn?
NO
Is the Belt ok?
NO
Replace the Belt.
YES
Does the Capstan Motor turn?
YES
Check the clutch and the Idler Assembly.
YES
Does the Drum Motor turn?
NO
Is the Voltage supplied to the Capstan Motor Vcc1,Vcc2 each?
YES
Are there DPG, DFG Pulses?
YES
Is the terminal voltage of Capstan Motor supplied more than 4V?
NO
Check Servo, Power.
YES
Are the T/Up Supply Reel Sensors ok?
YES
Replace the Capstan Motor.
YES NO
Check Servo, Syscon. Is the Vcc voltage of the Drum Motor normal?
NO
Check Syscon, Circuit.
YES
Is the terminal voltage of the Drum Motor more than 2.3V?
NO
Check Syscon, Circuit.
YES
Replace the Drum Motor.
28
MECHANISM TROUBLESHOOTING GUIDE
2. Front Loading Mechanism
A.
Cassette cannot be inserted.
Does the Lever Switch work?
NO
Is the Lever Switch Spring damaged or omitted?
NO NO
Replace or add the Lever Switch Spring.
YES YES
Is the Vcc of Main P.C.Board 5V? Does the F/L switch work normally? Replace F/L Switch.
YES
Check syscon circuit.
NO YES
Is the voltage between cassette switch and GND on Main P.C.Board 5V?
Check power circuit.
NO YES
Check Mode switch location and syscon circuit. Is there a short circuit between cassette switch and GND on main P.C.Board?
NO YES
Remove the short circuit part or Replace the main P.C.Board. Replace F/L Switch.
29
MECHANISM TROUBLESHOOTING GUIDE
B.
Cassette will not eject.
Does the L/D motor rotate in reverse?
NO
Check L/D Motor or Drive IC.
YES NO
Does the Lever Switch work? Replace lever Switch.
YES NO
Does the Arm Assembly F/L work normally? Replace Arm Assembly F/L.
YES NO
Does the Opener Door work? Replace the Opener Door.
30
MECHANISM TROUBLESHOOTING GUIDE
C.
Cassette will not load.
Does the CST insert?
YES
Does the opener Lid work?
YES
NO
Does the Gear Rack F/L work?
Replace the Opener Lid.
YES
NO
Does the Opener Door work?
Replace the Rear Rack F/L.
YES
NO
Does the Arm Assembly F/L work?
Is the opener Door assembled correctly?
YES
NO
Does the L/D Motor work?
Replace the Arm Assembly F/L.
YES
NO
Does the Holder Assembly Cassette move the Arm Assembly F/L?
Check the power of L/D Motor.
YES
NO
Is the Holder Assembly Cassette assembled correctly?
Replace the Front Loading Mechanism Assembly.
31