Hitachi VM-H38E Wartungsanleitung Seite 40

MECHANICAL BLOCK MAINTENANCE/
INSPECTION PROCEDURE
1. Required Maintenance/ Inspection
The mechanical block (tape transport system) in
an 8mm video camera/recorder uses very precise
components, If any of these components is worn
or dirty, the symptoms will be the same as if the
component is defective.
To ensure a good picture, the tape transport
system must be cleaned and lubricated periodically,
and worn-out components must be replaced.
2. Scheduled Maintenance/Inspection
Schedules for maintenance and inspection are not
fixed because they vary according to the way in
which and what for the customer uses the camera/
recorder and the environment in which it is used,
But, in general home use, a good picture will be
maintained if inspection and maintenance are done
every 500 hours.
Table 1 Average hours used per day and
maintenance/inspection schedules
About About About
6 ae 9 mont
Average hours
per day 18 months
One hour KML
Two hours Yl
Three hours Z
3. Check before Judging that Unit is Faulty
If the faults in Table 2 occur during playback,
they may be remedied when the tape transport
system is cleaned and lubricated. Check the
conditions of cleanliness of the unit and the
need for lubrication.
If from that you determine that the unit is ready
for inspection and maintenance, check the
components shown in Table 2
Table 2 Defective Phenomena and
Inspection Locations
Defective phenomenon F :
during play Inspection location
Dirt on vide head or
worn video head
Poor picture S/N,
no color
Dirt on pressure roller,
in tape transport system
or/and on cylinder
Tape does not run
or tape is slack
Dirt on video head or
worn video head
Low volume or
sound distorted
E3-2
LL
4. Tools Needed for Inspection and Maintenance
(1) Head cleaning kit
(2) VIR oil kit
(3) Ethyl alcohol (ethanol)
(4) Gauze
(5) Cleaning tape Maxell 8M-CL MCA (dry type)
Table 3 Locations for Greasing and
Lubricating using the Oil Kit
p Name Using locations
Sonic Slidas oil | Lubricate low-speed rotating
(#1600) sections
: 3 Grease metal or molded
Froil (G31-SAY) sections subject to light load
Fix adjustment screws and nuts
The above VIR kit and head cleaning kit are those
used conventionally (for VHS and VHS-C recorders).
Always use these kits for maintenance.
5, Maintenance Procedures
5-1. Cleaning
(1) Cleaning video heads
First use a specified cleaning tape. Before
using it, read its instruction sheet carefully.
If the dirt on the video heads is too
stubborn to be removed by tape, use the head
cleaning kit by the following procedure,
(See Fig. 1)
@ Moisten the chamois leather on the
cleaning stick with cleaning fluid,
@ Touch the chamois leather on the cleaning
stick against the head tip and gently turn
the upper cylinder to the left and right.
Caution: Do not move the cleaning stick
vertically or/and make sure that only
the chamois leather on the cleaning
stick comes into contact with the head
tip. Otherwise, the head tip could be
damaged,
CLEANING STICK CYLINDER
a
HEAD TIP
CHAMOIS LEATHER
(Coat with cleaning fluid)
Fig. 1 Vide Head Cleaning Procedure