Mitsubishi hs 7424 u service manual

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MITSUBISHI

ULTRAK

Service

1997

Manual

TIME LAPSE VIDEO CASSETTE RECORDER

VHS

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i: i:
a o . I: I: a D
H S-7424U
LILTRAK KR7IiHEll
Only cassettes marked VHS can be used with this video cassette recorder.
SPECIFICATIONS
Tape Format : VHS 1/2 high-density video Audio Output : -6st, 1kg unbalanced RCA
cassette tape ' pin plug
Power Source : t00~230V110% AC ; 60i-iz Operating Temperature : 41°F to 104°F
Power Consumption : Approx. 20W Relative Humidity : MAX. 80%
Television System : EIA standard 525lines, 60iieids Weight : Approx. 9.9 lbs.
NTSC type color signal Dimensions : 16.7(W) x 3.7(H) x 12.4"(D)
Video Becoming System : 4 rotary heads, azimuth helical Display Position : In any position
scanning system Timer Program : 8 programs-Daily start and stop
Luminance Signal : Frequency modulation recording time for one week.
Color Signal : Low frequency conversion, Display Format : Display model 1:
sub-carrier phase shift recording (Month)-(Day)-(Year) (Hour)
Audio Recording : 1 full track head, recording :(Minute) : (Second)
System system (Alarm recording no.)
Erase : 1 full track head : Display model 2:
Linear Audio Track : 1 track (Month)-(Day)-(Year) (Hour)
FGFQVHd/mfim : Approx. 14OSec. with T-120 : (Day of week) : (Alain
. cassette recording no.). '_ '
Alarm Recording Time : Timed: 15sec] SOsecJ 45$ecJ (Hour) : (Minute) : (Second)
1minJ 2min./ 5min./ 10min. (Recording mode)
Manual 1: Until the alarm reset Battery Back Up : Lasts 31 days
switch is switched on. Deck U Deck
Manual 2: '1" the ab. set Tape Speed and Recordingi Time (with T420 cassette)
. swnch Is swttchedoti. Mode Time Speed (Drive) Recordinwerval
Video input : 1.0Vp«p, 759 unbalanced BNC 2H 2m 33 36 (c . ) eve, field
plug a 3 .
Audio Input : -8st, 50m unbalanced RCA Hz: 13:: um ICUMBI :23:
pin plug .
Video Output : 1.0Vp-p, 75:2 unbalanced BNC L24 26 wmwm 3 a

plug

- Weight and dimensions shown are approximate.
0 Design and specifications are subject to change without notice.

MITSUBISHI ELECTRONICS AMERICA INC.

Information Technologies Group
5665 Plaza Drive, P. 0. BOX 6007, Cypress, California 90630

Copyright © 1997 Mitsubishi Electronics America Inc. All Rights Reserved.

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CONTENTS

SAFETY PRECAUTIONS.... ..... .. .................
CONNECTING WITH OTHER EQUIPMENT
CHECK PROCEDURE 0F ELAPSED TIME
WARNING INDICATION ..
CONTROL INPUT/OUTPUT SIGNALS AND CIRCU

MAINTENANCE GUIDE ......... .. ............. ..................... 8
DISASSEMBLY ............ . ....................................... ....9
HOW TO EXECUTE CIRCUIT BOARD SERVICE
DECK OPERATION CHECK ......
ELECTRICAL ADJUSTMENTS..

LOCATIONS ................. ..18

Servo Circuit Adj usiment.,
Y/C signal Circuit Adjustmen
Audio Circuit Adjustmem..
TImer Circuit Adjustment .................

MECHANICAL ADJUSTMENT
AND REPLACEMENT

1. Cleaning the DECK.
1-1 VIDEO HEAD .....

1-2 Tape Transport ..................

1-3 REEL DISK Drive System.

2. Replacement of Major Parts ............................ 25
2-1 GUIDE ARM (SP), CLEANING ARM,
CLEANING ROLLER UNIT ......................... 25

.25
.26

2-2 STAY PLATE .......
2-6 BOTTOM UNIT...

2-4 NC HEAD UNIT . .28
2-5 FE HEAD ............ .28
2-6 SHUT LEVER UNIT ..................................... 29
2-7 LAMP GUIDE,

MODE POSITION GUIDE ........................... 30

213 TENSION SPRING, TENSION ARM,
TENSION BELT UNIT.
2-9 BRAKE SPRING (for MAIN BRAKE (SP)),
MAIN BRAKE (SP).
BRAKE SPRING (for MAIN BRAKE (TU)),

....31

MAIN BRAKE (TU). ...33
2-10 REEL DISK (On SP Slde),

REEL DISK (On TU side) ............................ 33
2-11 LOADING BELT,

LOADING MOTOR ASSY . ...,35

2-12

2-13

2-14
2-15

246

2-17

2-1 8

2-19

2-20

2-21
2-22

2-23
2-24
2-25
2-26
227
2-28
2-29
2-30

2-31
2-32
2-33

PINCH ARM CAP2, PINCH ARM UNIT,
PINCH GEAR ARM 2,

PINCH CAM HOLDER.

PINCH CAM SPRING.

PINCH CAM LEVER,

PINCH RACK SLIDER,

PINCH CAM GEAR ..................................... 36
GUIDE ARM ASSY (TU),

GUIDE SPRING (TU),
LOADING TG LEVER.
REC SPRING, REC LEVER
REEL BELT. BELT PULLEY.
SHIFT SPRING ........................................... 42
CAPSTAN BRAKE SPRING,

CAPSTAN BRAKE ....................................... 43
MODE HOLDER,

REEL LOCK LEVER.

MODE GEAR, FIL DRIVE GEAR,

F/L DRIVE LEVER,

WORM PULLEY UNIT,

LOADING WORM GEAR ............................ 43
CONTROL WIND LEVER,

TENSION LEVER UNIT .............................. 47
PHOTO GUIDE UNIT (SP),

PHOTO GUIDE UNIT (TU) .......................... 49
LOADING GEAR,
LAMP LOADING GEAR
CAM GEAR (TU) ..........
PHOTO UNIT,

REEL GEAR UNIT (TU),
REEL GEAR UNIT (SP)
IDLER CENTER LEVER ..
PULLEY GEAR. IDLER UNIT..
F/L ARM UNIT (SP) ......
F/L ARM UNIT (TU) ..
SYNC GEAR ASSV
F/L DOOR ARM.
WIND LEVER UNIT
LOADING LOCK SPRING,

LOADING LOCK LEVER ............................. 58
CAPSTAN MOTOR
CAM GEAR (SP)
LOADING ARM UNIT (TU),

LOADING ARM UNIT (SP) .......................... 61