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SERVICE MANUAL
DA
TA
BASIC VIDEO MECHANISM
: D33Y3 DI-2HD/NP(6721RF0605A)
VIDEO CASSETTE PLAYER
HV-MC90
S/M Code No. 09-019-358-4N1
KE


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-2-
TABLE OF CONTENTS
SPECIFICATIONS ................................................................... 3
ACCESSORIES LIST .............................................................. 4
DISASSEMBLY INSTRUCTIONS ............................................ 5
SERVICE POSITION ............................................................... 6
VCR TEST TAPE INTERCHANGEABILITY TABLE ............... 7
ELECTRICAL PARTS LIST ............................................. 8 ~ 15
TRANSISTOR ILLUSTRATION ............................................. 16
WIRE HARNESS DIAGRAM ................................................. 17
BLOCK DIAGRAM ........................................................ 18 ~ 21
SCHEMATIC DIAGRAM
1. POWER ............................................................................. 22
2. AUDIO/VIDEO ................................................................... 23
3. SYSTEM CONTROL ......................................................... 24
WIRING
1. MAIN C.B .......................................................................... 25
WAVEFORM
AUDIO/VIDEO SECTION ...................................................... 26
SYSTEM CONTROL SECTION ............................................ 27
VOLTAGE CHART
1. POWER SECTION ............................................................ 28
2. AUDIO/VIDEO SECTION .................................................. 28
3. SYSTEM CONTROL ......................................................... 29
ADJUSTMENT ....................................................................... 30
IC BLOCK DIAGRAM ............................................................ 31
IC DESCRIPTION .......................................................... 32 ~ 34
ELECTRICAL TROUBLESHOOTING ........................... 35 ~ 47
MECHANICAL EXPLODED VIEW 1/1 .................................. 48
MECHANICAL PARTS LIST 1/1 ..................................... 49,50
MECHANISM EXPLODED VIEW 1/3 .................................... 51
MECHANISM PARTS LIST 1/3 ............................................. 52
MECHANISM EXPLODED VIEW 2/3 .................................... 53
MECHANISM PARTS LIST 2/3 ............................................. 54
MECHANISM EXPLODED VIEW 3/3 .................................... 55
MECHANISM PARTS LIST 3/3 ............................................. 56
OTHER PARTS LIST ............................................................. 57
DECK MECHANISM PARTS LOCATIONS
Top View ................................................................................. 58
Bottom View ........................................................................... 58
DECK MECHANISM DISASSEMBLY
1. Drum Assembly ................................................................ 59
2. Plate Assembly Top .......................................................... 61
3. Holder Assembly CST ...................................................... 61
4. Guide CST ....................................................................... 61
5. Bracket Side (L)/Bracket Assembly Door ......................... 61
6. Arm Assembly F/L ............................................................ 61
7. Lever Assembly S/W ........................................................ 61
8. Arm Assembly Cleaner ..................................................... 62
9. Head F/E .......................................................................... 62
10. Base Assembly A/C Head ............................................... 62
11. Brake Assembly S ........................................................... 63
12. Brake Assembly T ........................................................... 63
13. Arm Assembly Tension .................................................... 63
14. Reel S & Reel T .............................................................. 63
15. Support CST ................................................................... 64
16. Base Assembly P4 .......................................................... 64
17. Opener Lid ...................................................................... 64
18. Arm Assembly T/up ......................................................... 64
19. Arm Assembly Pinch ....................................................... 64
20. Belt Capstan/Motor Capstan ........................................... 65
21.Clutch Assembly D33-Y ................................................... 65
22. Lever F/R ........................................................................ 65
23. Gear H-Up/D-K or
Gear Up/D-K ................................................................... 65
24. Bracket Assembly Jog ..................................................... 66
25. Guide Rack F/L, Gear Rack F/L ...................................... 66
26. Brake Assembly Capstan ................................................ 66
27. Gear Drive/Gear Cam/Gear Connector .......................... 67
28. Bracket Assembly L/D Motor ........................................... 67
29. Gear Sector ..................................................................... 68
30. Base Tension/Plate Slider/Lever Tension ........................ 68
31. Gear Assembly P3/Gear Assembly P2 ........................... 69
32. Base Assembly P3/Base Assembly P2 ........................... 69
33. Arm Assembly Idler or Arm assembly Idler Jog ............... 69
DECK MECHANISM ADJUSTMENT
Tools and Fixtures for Service ................................................ 70
1. Mechanism Alignment Position Check .............................. 71
2. Preparation for Adjustment ............................................... 72
3. Checking Torque ............................................................... 72
4. Guide Roller Height Adjustment ........................................ 73
4-1. Preliminary Adjustment ................................................. 73
4-2. Precise Adjustment ....................................................... 73
5. Audio/Control (A/C) Head Adjustment ............................... 74
5-1. Preliminary Adjustment ................................................. 74
5-2. Confirm that the Tape Passes smoothly between
the Take-up Guide and Pinch Roller ............................ 75
5-3. Precise Adjustment (Azimuth Adjustment) .................... 75
6. X-Value Adjustment ........................................................... 75
7. Adjustment after Replacing Drum Assembly
(Video Heads) .................................................................... 76
8. Check the Tape Travel after Reassembling
Deck Assembly ................................................................... 76
8-1. Checking Audio and RF Locking Time
during Playback and after CUE or REV ....................... 76
8-2. Check for Tape Curling or Jamming .............................. 76
MAINTENANCE/INSPECTION PROCEDURE
1. Check before starting Repairs .......................................... 77
2. Required Maintenance ...................................................... 78
3. Scheduled Maintenance ................................................... 78
4. Supplies Required for Inspection and Maintenance ......... 78
5. Maintenance Procedure .................................................... 78
5-1. Cleaning ........................................................................ 78
5-2. Greasing ....................................................................... 79
MECHANISM TROUBLESHOOTING GUIDE
1. Deck Mechanism ...................................................... 80 ~ 82
2. Front Loading Mechanism ........................................ 83 ~ 84


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-3-
SPECIFICATIONS
· Design and specifications are subject to change without notice.
Video recording system
Rotary 2 head helical scanning system
Video head
2 heads
Video signal system
PAL/MESECAM color signal, 625 lines, 50 fields
NTSC color signal, 525 lines, 60 fields
Usable cssettes
VHS video cassettes
Recording/playback time
PAL/MESECAM
SP: 5 hours max. with E-300 tape.
LP: 10 hours max. with E-300 tape
NTSC
SP: 3 hours 30 minutes max. with T-210 tape
LP: 7 hours max. with T-210 tape (playback only)
EP: 10 hours 30 minutes max. with T-210 tape
Tape speed
PAL/MESECAM
SP: 23.39 mm/s
LP: 11.69 mm/s
NTSC
SP: 33.35 mm/s
LP: 16.67 mm/s
EP: 11.12 mm/s
Rewind time:
Approx. 3 min. with E-180 tspe
Video input
1.0 Vp-p, 75 ohm, unbalanced
Video output
1.0 Vp-p, 75 ohm, unbalanced
Horizontal resolution
240 lines (SP mode)
Video S/N
42 dB (SP mode)
Audio track
1 track (Normal sound)
Audio input
-6 dBm, more than 47 k ohm
Audio output
-6 dBms, less than 4.7 k ohm
Operating temperature:
5 °C to 35 °C
Power requirements
110 - 240 V AC, 50/60 Hz
Power consumption
10 watts
TYP 3 watts (power save mode.)
Dimensions
360 (W) x 270 (D) x 94.5 (H) mm
Weight
(141 /
4 x 10
3/
4 x 3
3/
4 in)
Approx. 3.3 kg (7.26 lbs)


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!
= ! SAFTY PARTS
C
= Components marked
All components used on this model at the production line are shown in this service manual.
However, please note that not all components will be available as spare parts for after-sales service.
Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers.
Components marked X and R are not designated as spare parts for after sales service, and will not be stocked at the spare parts centers.
UNIT-NAME
! C REF-NO PARTS-NO
PARTS-NAME
SUFFIX&MODEL
-4-
ACCESSORIES PARTS LIST -1/1
HV-MC90
KEJC
O
1
S8-35R-P00-66W INSTRUCTION ASSY
A
O
2
S7-11R-2P0-36A RC UNIT,P8(CLA112TW HA7IA)
A
O
3
S8-50R-CAA-260 CABLE,COAXIAL 1200M/M
A
O
4
S8-51R-P00-03A CABLE ASSY,RF/SCART/RCA USI
A


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-5-
1. Top Case Removal
1) Remove 4 screws holding the top case.
2. Panel Front Removal (see Fig. 1)
1) Release 7 tabs, and then remove the panel front.
Fig. 1
3. Mechanism Removal (see Fig. 2)
1) Disconnect the drum FF cable from the connector (PMD01)
on the Main C.B.
2) Disconnect the ACE head FF cable from the connector (P3D02)
on the Main C.B.
3) Remove 6 screws A .
Fig. 2
DISASSEMBLY INSTRUCTIONS -1/1
4. Main C.B. Removal (see Fig. 3)
1) Remove 2 screws B holding the panel assy, distri-butor.
2) Release 5 tabs, and then simultaneously lift the panel assem-
bly, distributor and Main C.B. to remove them.
Fig. 3
PANEL
FRONT
TAB
FF CABLE
P3D02
FF CABLE
PMD01
A
A
A
PANEL
DISTRIBUTOR
MAIN C.B
TAB
TAB
TAB
TAB
TAB
B