Hitachi VT-MX223AW Video cassette recorder
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Model:
VT-MX223AW
Datum:
1997
Categorie:
Groep:
Omschrijving:
Handleidingen type:
Servicehandboek
Pagina’s:
88
Grootte:
10.01 Mbytes (10497521 Bytes)
Taal:
english
Herziening:
Handleidingen-ID:
4719E
Datum:
1997 09 01
Kwaliteit:
Gescand document alle leesbaar.
Upload datum:
2017 04 16
MD5:
aba58be66994c71ca2543ad14086bd71
Downloads:
1813
Informatie
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