(No.YD068)1-29
4.4.2 Essential Check and Repair
Recording density of the video is far higher than the audio.
Therefore video parts are very precise so as to allow only error
of 1/1000mm or so in order to maintain compatibility with other
videos.
If one of these parts is polluted or old, same phenomena will
appear as they are damaged.
To maintain clear screen, regular check, replacement of old and
damaged parts and oil supply, etc are essential.
4.4.3 Regular Check and Repair
Check and repair schedule is not constant since they vary de-
pending on method that the consumer uses video and environ-
ment where the video is installed at.
However, for the video used by common household, good screen
will be maintained if regular check and repair per 1,000 hour is
performed. The following chart shows relationship between us-
ing time and checking time:
4.4.4 Tools for Check and Repair
(1) Grease: Floil G-3114 (KANTO) or equivalent grease
(Green)
(2) Grease: Kanto G-754, PL-433 (Yellow)
(3) Alcohol (Isopropyl Alcohol)
(4) Cleaning Patch (cloth)
4.4.5 Maintenance Process
4.4.5.1
Removal of Foreign Material
(1) Removal of foreign material from video head (Fig. C-9-4)
Firstly try to use a cleaning tape.
Use a cleaning patch if foreign materials are not removed
with the cleaning tape due to severe dirty of the head.
Soak the cleaning patch in alcohol and put it to the head tip.
Smoothly turn the drum (turning cylinder) to the right or left
(In this case, the cleaning patch must not be moved verti-
cally).
After completely drying the head, test the traveling status
of the tape.
If alcohol (Isopropyl Alcohol) remains at the video head, the
tape may be damaged when this solution touches with the
head surface.
Never use a cloth bar (commercial sale)
(2) Wipe the tape transport system and the drive system with
the cleaning patch soaked in alcohol (Isopropyl Alcohol)
when removing foreign materials from them.
1) The part touched with the traveling tape is called as tape
transport system. The drive system consists of parts to
travel the tape.
2) Care must be exercised so that unreasonable force to
change the pattern will be applied to the tape transport
system during removal of foreign materials.
About
1 year
One hour
Two hours
Three hours
Time
Requiring
Checking
Average
hours used
per day
About
18 months
About
3 years
Fig. C-9-4
Drum
(Turning Cylinder)
Head Tip
Soak alcohol
(Isopropyl Alcohol).
Cleaning Patch
(Cloth)
Smoothly turn the drum (turning
cylinder) touching the soft surface
to the head tip surface.
Содержание HR-XV28SEF
Страница 9: ... No YD068 1 9 SECTION 3 DISASSEMBLY This service manual does not describe DISASSEMBLY ...
Страница 69: ... No YD068 1 69 F FE RFL FIG 7 2 DVD F FE RFL FIG 7 3 CD ...
Страница 70: ...1 70 No YD068 5 4 8 FOCUS ON WAVEFORM F FE RFL FIG 7 4 CD FOCUS_S FACT FACT FIG 8 1 DVD ...
Страница 74: ...1 74 No YD068 5 4 13 ZR36868 AUDIO OUTPUT TO AUDIO DAC 2 COMPOSITE VIDEO SIGNAL FIG 12 2 FIG 13 1 ...
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Страница 84: ...A 1 2 3 4 5 B C D E F G EE MODE VIDEO TU MODE AUDIO TUNER IF CIRCUIT DIAGRAM SHEET 4 2 11 2 12 ...
Страница 86: ...A 1 2 3 4 5 B C D E F G SCART JACK CIRCUIT DIAGRAM SHEET 6 2 15 2 16 ...
Страница 87: ...A 1 2 3 4 5 B C D E F G ع DVD SERVO CIRCUIT DIAGRAM SHEET 7 2 17 2 18 ...
Страница 88: ...A 1 2 3 4 5 B C D E F G ع DVD AV JACK CIRCUIT DIAGRAM SHEET 8 2 19 2 20 ...
Страница 89: ...A 1 2 3 4 5 B C D E F G ع DVD SYSTEM CIRCUIT DIAGRAM SHEET 9 2 21 2 22 ...
Страница 90: ...PRINTED CIRCUIT DIAGRAMS VCR MAIN BOARD TOP SIDE 2 23 2 24 ...
Страница 91: ...VCR MAIN BOARD BOTTOM SIDE 2 25 2 26 ...
Страница 92: ...COMPONENT PARTS LOCATION GUIDE VCR MAIN 2 27 2 28 ...
Страница 93: ...LOCATION GUIDE LOCATION GUIDE POWER BOARD KEY BOARD 2 29 2 30 ...
Страница 101: ...IC7V1_SDA5650X IC802_NM1232 IC903_BH78968FS IC803_LD1117A IC801_ DA9605H IC BLOCK 2 45 2 46 ...
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