Equipment information

Hitachi VT-MX425AW Video cassette recorder
Manufacturer
Hitachi
Model VT-MX425AW
Date 1997
Category Audio, Video, TV, Multimedia
Group Video cassette recorder
Description
Information
                                    

These manuals are available for the above equipment:

Manual Type Service Manual Hitachi-8895-Manual-Page-1-Picture
Pages 88
Size 10.01 Mbytes (10497521 Bytes)
Language english
Revision
Manual-ID/Number 4719E
Date 01 September 1997
Quality Scanned document, all readable.
Upload date
MD5 aba58be66994c71ca2543ad14086bd71
Downloads 225 since 16 April 2017
Information
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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