Geräte Informationen

Hitachi VT-MX425AW Videorecorder
Hersteller:
Hitachi
Modell: VT-MX425AW
Datum: 1997
Kategorie: Audio, Video, TV, Multimedia
Gruppe: Videorecorder
Beschreibung:
Informationen:
                                    

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Dokumenttyp: Serviceanleitung Hitachi-8895-Manual-Page-1-Picture
Seitenanzahl: 88
Dateigröße: 10.01 Mbytes (10497521 Bytes)
Sprache: Englisch
Revision:
Dokument-ID/Nummer: 4719E
Datum: 01 September 1997
Qualität: Gescanntes Dokument, alles ist lesbar.
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MD5: aba58be66994c71ca2543ad14086bd71
Downloads: 90 seit dem 16 April 2017
Informationen:
CHAPTER 1 GENERAL INFORMATION
C O N TEN1.
Specifications......................................................
2. Comparison with Previous M od el.....................
3. Comparison of Main Control IC s.......................
4. Tips for
Servicing................................................
4-1. Trouble Display F unction.............................
4-2. How to Remove the Cassette when a
Malfunction Has Occurred in the Mechanism
4-3. Instructions on U s e
......................................
■
 1-1
■
 1-2
■1-3
■ 1-4
■1-4
■ 1-5
■
 1-6
CHAPTER 2
 DISASSEMBLY
1. Before Starting Disassem
bly....................................... 2-1
2. Disassembly M eth od
.................................................... 2-1
Parts Hierarchy C h a
rt...................................................2-1
Disassembly Procedure D iagram
s..............................2-2
2-1. Top cover, front panel, rear panel
and US-FL m echanism .................................... 2-2
2-2. Cassette door and
insulator................................... 2-2
2-3. SHU
board................................................................2-3
2-4. Front piece and LCD
board.................................... 2-3
2-5. US mechanism/MAS board assembly................... 2-3
2-6. Separation of MAS board from US mechanism ■■■■ 2-4
2-7. Procedure to remove only the US m echanism .... 2-4
3. Cautions When Reinstalling the US Mechanism ....... 2-5
CHAPTER 3
 ELECTRIC CIRCUIT ADJUSTMENT
Service Position
1. Servicing position during electrical adjustm ent..........3-1
2. Servicing positions when repairing
and checking circu
its.................................................. 3-1
2-1. Procedure to set the LCD and SHU
board to the servicing
positions................................. 3-1
2-2. Procedere to set the MAS board to
the service
position..................................................... 3-1
3. Be careful of electric
shocks........................................ 3-1
Electrical Circuit Adjustment
1. Test equipment/jigs necessary for adjustm ent...........3-2
2. Cautions on adjustm
ent................................................3-2
3. Tips for adjustm
ent....................................................... 3-2
3-1. Procedure to reset the main microprocessor....... 3-2
3-2. Procedure to switch off the blue
background
function...................................................3-2
3-3. Procedure to obtain the EP head playback mode
(X-value adjustment test m o d e
)................................3-2
4. Connections of test equipm
ent.................................... 3-2
5. Test Points and Adjustment
points..............................3-3
TS
6. Servo Circuit Adjustm
ents.......................................
6-1. Switching point adjustm ent................................
6-2. X-value adjustm
ent.............................................
6-3. Vertical jitter
adjustment.....................................
6-4. Forward slow tracking preset adjustm ent.........
6-5. Reverse slow tracking preset adjustm ent........
7. Audio/MTS Circuit Adjustm ents...............................
7-1. Hi-Fi audio playback level check.......................
7-2. MTS input level adjustm ent................................
8. List of Data in EEPROM and Initial Settings...........
9. List of Hidden C om m
ands.......................................
9-1. Mode setting commands during adjustm ent....
9-2. EEPROM initialization com m ands....................
10. Initial Settings of IC903(EEPROM).......................
11. Caution When Replacing IC903(VCR EEPROM)-
■3-4
■3-4
•3-4
•3-5
■3-5
■3-5
■3-6
■3-6
■3-6
■3-7
■3-7
■3-7
■3-8
■3-8
•3-8
CHAPTER 4
 EXPLODED VIEWS
 ]
1. CABINETS E C TIO N
..................................................... 4-1
2. US-MECHA NISM (TOP VIEW) SECTION.................. 4-2
3. US-MECHA NISM (BOTTOM VIEW) SECTION..........4-3
4. US-FL MEC HANISM
SECTION................................... 4-4
CHAPTER 5
 REPLACEMENT PARTS LIST
 ]
1. MECHANIS M PARTS L IS T
......................................... 5-1
2. ELECTRIC/L PARTS L IS T
......................................... 5-2
CHAPTER 6
SCHEMATIC, CIRCUIT BOARD AND
BLOCK DIAGRAMS
Schematic and circuit board diagrams
[VT-MX223AW,MX425AW]
CONNECTION DIAGRAM
................................................6-1
SCHEM ATIC/CIRCUIT
LCD
DISPLAY[LCD]............................................6-2
/ 6-18
LCD DISPLAY GRID T A B LE .............................-6 -3 / -
SHUTTLE SW ITCH[SHU]................................... 6-3
/ 6-18
CYL. MOTOR
DRIVE...........................................6-4 / -
CAPSTAN
MOTOR..............................................6-4 / -
MECHANISM SENSOR[MAS]............................6-5 / 6-20
MAIN CONTROL[MAS]....................................... 6-6
/ 6-20
MTS/JACK[MAS].................................................
6-8 / 6-20
PREAMP/FM AUDIO[MAS] ...............................6 -1 0
/6 -2 0
LUMA/CHROMA,LINEAR AUDIOfMAS]............6-14 / 6-20
SWITCHING REGULATOR[MAS]..................... 6 -1 6/6 -20
SERVO
WAVEFORMS................................................... 6-5
LUMA/CHROMA WAVEFORMS ................................... 6-13
[VT-FX621AW]
CONNECTION DIAG RAM
..............................................6-51
SCHEMATIC/CIRCUIT
LCD
DISPLAY[LCD]............................................6-52
/ 6-68
LCD DISPLAY GRID T A B LE ..............................6-53 / -
CYL. MOTOR
DRIVE...........................................6-54 / -
CAPSTAN M
OTOR..............................................6-54 / -
MECHANISM SENSOR[MAS]............................6-55 / 6-70
MAIN CONTROL[MAS].......................................
6-56 / 6-70
MTS/JACK[MAS]
................................................. 6-58 / 6-70
PRE AMP/FM AUDIO[MAS] ...............................6-60 / 6-70
LUMA/CHROMA,LINEAR AUDIO[MAS]............6-64 / 6-70
SWITCHING REGULATOR[MAS]..................... 6 -6 6 /6 -7 0
SERVO W
AVEFORMS................................................... 6-55
LUMA/CHROMA W AVEFORM S................................... 6-63
Block diagrams
1. MAIN C O N TR O
L.................................................... 6-101
2. S E R VO
....................................................................
6-103
3. A U D IO
.....................................................................
6-105
4. VIDEO
.....................................................................
6-107
5.
REGULATOR..........................................................6-109
Microprocessor Pin Function Tables
1. LCD Driver (IC
701).................................................6-110
2. Main uP (IC 9 0 1
)..................................................... 6-111
CHAPTER 7
 TROUBLE DISPLAY AND
.
 TROUBLESHOOTING
Trouble Display
Function..............................................7-1
Troubleshooting According to Malfunction Display .. 7-2
Troubleshooting the Switching Regulator................... 7-6
Hitachi-8895-Manual-Page-1-Picture


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