Aiwa HV-FX7800 - SERVICE User manual

SERVICE MANUAL
DATA
BASIC VIDEO MECHANISM
: D33Y1-4HF/PAL(6721RF0450A)
STEREO VIDEO CASSETTE RECORDER
HV-FX7800
HV-FX5850
S/M Code No. 09-016-357-3N4
EH
EH
HV-FX5850HV-FX7800

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TABLE OF CONTENTS
SPECIFICATIONS ................................................................... 3
ACCESSORIES LIST .............................................................. 4
DISASSEMBLY INSTRUCTIONS............................................ 5
SERVICE POSITION ............................................................... 6
VCR TEST TAPE INTERCHANGEABILITY TABLE ............... 7
ELECTRICAL MAIN PARTS LIST..................................... 8 ~ 9
TRANSISTOR ILLUSTRATION............................................. 10
WIRE HARNESS DIAGRAM ................................................. 11
BLOCK DIAGRAM ........................................................ 12 ~ 17
SCHEMATIC DIAGRAM
1. POWER/TUNER/NICAM................................................... 18
2. AUDIO/VIDEO ................................................................... 21
3. Hi-Fi AUDIO/SCART ......................................................... 22
4. SYSTEM CONTROL/SERVO/OSD .................................. 24
5. KEY-1 ................................................................................ 30
6. KEY-2 ................................................................................ 32
WAVEFORM
AUDIO/VIDEO SECTION ...................................................... 20
SYSTEM CONTROL/SERVO/OSD SECTION ..................... 26
VOLTAGE CHART
1. POWER/NICAM SECTION ............................................... 19
2. AUDIO/VIDEO SECTION .................................................. 19
3. Hi-Fi AUDIO/SCART SECTION ........................................ 23
4. SYSTEM CONTROL/SERVO/OSD SECTION ................. 25
FL DISPLAY/LED DISPLAY .................................................. 27
WIRING
1. MAIN C.B .......................................................................... 28
2. NICAM/A2 C.B .................................................................. 29
3. KEY-1 C.B ......................................................................... 31
4. KEY-2 C.B ......................................................................... 33
ADJUSTMENT....................................................................... 34
IC BLOCK DIAGRAM............................................................ 35
IC DESCRIPTION .......................................................... 36 ~ 40
ELECTRICAL TROUBLESHOOTING ........................... 41 ~ 57
MECHANICAL EXPLODED VIEW 1/1 .................................. 58
MECHANICAL MAIN PARTS LIST 1/1 ........................ 59 ~ 60
MECHANISM EXPLODED VIEW 1/3~3/3 ................... 61,63,65
MECHANISM MAIN PARTS LIST 1/3~3/3 .................. 62,64,66
DECK MECHANISM PARTS LOCATIONS
Top View................................................................................. 67
Bottom View ........................................................................... 67
DECK MECHANISM DISASSEMBLY
1. Drum Assembly ................................................................ 68
2. Plate Assembly Top .......................................................... 70
3. Holder Assembly CST ...................................................... 70
4. Guide CST ....................................................................... 70
5. Bracket Side (L)/Bracket Assembly Door ......................... 70
6. Arm Assembly F/L ............................................................ 70
7. Lever Assembly S/W ........................................................ 70
8. Arm Assembly Cleaner ..................................................... 71
9. Head F/E .......................................................................... 71
10. Base Assembly A/C Head ............................................... 71
11. Brake Assembly S ........................................................... 72
12. Brake Assembly T ........................................................... 72
13. Arm Assembly Tension .................................................... 72
14. Reel S & Reel T .............................................................. 72
15. Support CST ................................................................... 73
16. Base Assembly P4 .......................................................... 73
17. Opener Lid ...................................................................... 73
18. Arm Assembly T/up ......................................................... 73
19. Arm Assembly Pinch ....................................................... 73
20. Belt Capstan/Motor Capstan ........................................... 74
21.Clutch Assembly D33-Y ................................................... 74
22. Lever F/R ........................................................................ 74
23. Gear H-Up/D-K or Gear Up/D-Y ..................................... 74
24. Bracket Assembly Jog ..................................................... 75
25. Guide Rack F/L, Gear Rack F/L ...................................... 75
26. Brake Assembly Capstan ................................................ 75
27. Gear Drive/Gear Cam/Gear Connector .......................... 76
28. Bracket Assembly L/D Motor ........................................... 76
29. Gear Sector ..................................................................... 77
30. Base Tension/Plate Slider/Lever Tension ........................ 77
31. Gear Assembly P3/Gear Assembly P2 ........................... 78
32. Base Assembly P3/Base Assembly P2 ........................... 78
33. Arm Assembly Idler or Arm assembly Idler Jog ............... 78
DECK MECHANISM ADJUSTMENT
Tools and Fixtures for Service ................................................ 79
1. Mechanism Alignment Position Check .............................. 80
2. Preparation for Adjustment ............................................... 81
3. Checking Torque ............................................................... 81
4. Guide Roller Height Adjustment ........................................ 82
4-1. Preliminary Adjustment ................................................. 82
4-2. Precise Adjustment ....................................................... 82
5. Audio/Control (A/C) Head Adjustment ............................... 83
5-1. Preliminary Adjustment ................................................. 83
5-2. Confirm that the Tape Passes smoothly between
the Take-up Guide and Pinch Roller ............................ 84
5-3. Precise Adjustment (Azimuth Adjustment) .................... 84
6. X-Value Adjustment ........................................................... 84
7. Adjustment after Replacing Drum Assembly
(Video Heads) .................................................................... 85
8. Check the Tape Travel after Reassembling
Deck Assembly................................................................... 85
8-1. Checking Audio and RF Locking Time
during Playback and after CUE or REV ....................... 85
8-2. Check for Tape Curling or Jamming.............................. 85
MAINTENANCE/INSPECTION PROCEDURE
1. Check before starting Repairs .......................................... 86
2. Required Maintenance ...................................................... 87
3. Scheduled Maintenance ................................................... 87
4. Supplies Required for Inspection and Maintenance ......... 87
5. Maintenance Procedure .................................................... 87
5-1. Cleaning ........................................................................ 87
5-2. Greasing ....................................................................... 88
MECHANISM TROUBLESHOOTING GUIDE
1. Deck Mechanism ...................................................... 89 ~ 91
2. Front Loading Mechanism ........................................ 92 ~ 93

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SPECIFICATIONS
• Design and specifications are subject to change without notice.
Video recording system Rotary 2 head helical scanning system
Video head Double azimuth 4 heads
Tuner system Frequency synthesized tuner
TV system B/G
Video signal system MESECAM/PAL color signal,
625 lines, 50 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 (Playback only)
SP: 3 hours 30 minutes max.
with T-210 tape
LP: 7 hours max. with T-210 tape
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 (Playback only)
SP: 33.35 mm/s
LP: 16.67 mm/s
EP: 11.12 mm/s
Rewind time: Approx. 3 min. with E-180 tape
Channel coverage VHF: E02 – E12
UHF: E21 – E69
CATV: S01 – S41
Video input 0.5 - 2.0 Vp-p, 75 ohm, unbalanced
Video output 1.0 Vp-p, 75 ohm, unbalanced
Horizontal resolution 240 lines (SP)
Video S/N 43 dB (SP)
Audio track 3 tracks
(Hi-Fi sound 2 tracks, Normal sound 1 track)
Audio input SCART: -6 dBm, more than 10 k ohm
RCA: -6 dBm, more than 47 k ohm<FX7800>
Audio output SCART: -6 dBm, more than 1 k ohm
RCA: -6 dBm, less than 1 k ohm
Hi-Fi frequency response 20 Hz - 20 kHz
Hi-Fi dynamic range More than 87 dB (SP)
Hi-Fi Wow & Flutter Less than 0.01%(SP)
Operating temperature: 5 °C to 35 °C
Power requirements 200 - 240 V AC, 50 Hz
Power consumption 16 watts
TYP 2.1 watts (power save mode.)
Dimensions 360 (W) x 270 (D) x 94.5 (H) mm
(141/4x 103/4x 33/4in.)
Weight Approx. 3.2 kg (7.04 lbs.)

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REF. NO PART NO. KANRI DESCRIPTION
NO.
ACCESSORIES LIST -1/1
1 S8-35R-P00-66T INSTRUCTION ASSY CFA929MP<78>
1 S8-35R-P00-66U INSTRUCTION ASSY CFA911MP<58>
2 S7-11R-1P0-33D REMOTE CONTROLLER ASSEMBLY(CFA<78>
2 S7-11R-1P0-33J REMOTE CONTROLLER ASSY,CFA910T<58>
3 S8-50R-CAA-260 CABLE,COAXIAL 1200M/M
4 S8-51R-P00-03F CABLE ASSY,RF/SCART/RCA USI
5 S6-11R-2G0-01A PLUG ASSY 2WAY RED/WHITE
TYPE MODEL NAME SUFFIX
<78> HV-FX7800 EH
<58> HV-FX5850 EH

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DISASSEMBLY INSTRUCTIONS -1/1
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. Key1 C.B. and Key2 C.B. Removal (see Fig. 2)
1) Release 2 tabs, and then remove Key1 C.B. from the connec-
tor (PKM02) in the direction of arrow 1 .
2) Release the tab, and then remove Key2 C.B. from the connec-
tor (PKM01) in the direction of arrow 2 .
Fig. 2
4. Mechanism Removal (see Fig. 3)
1) Disconnect the drum FF cable from the connector (PMD01)
on the Main C.B.
2) Disconnect theACE head FF cable from the connector (P3D02)
on the Main C.B.
3) Remove 6 screws A .
Fig. 3
5. Main C.B. Removal (see Fig. 4)
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. 4
PANEL
FRONT TAB
TAB
TAB
TAB
KEY2 C.B
KEY1 C.B
MAIN C.B
PKM02
PKM01
1
2
FF CABLE P3D02
FF CABLE
PMD01
A
AA
PANEL
DISTRIBUTOR
MAIN C.B
TAB
TAB
TAB
TAB
TAB
B