Cleaning - JVC GY-DV5000U Service Manual

2.4.3 Cleaning

The tape transport system should be cleaned periodically. Be
sure to clean the tape transport system upon receipt of a set for
servicing, etc. To clean use a good quality fine-textured cloth
moistened with ethyl alcohol.
1) When the video head is stained, the playback output level
decreases and a read error will not be able to be corrected
by the error correction. If this occurs, block noise appear on
the monitor, the audio will not be output, and the video out-
put will eventually be lost when the video head becomes
extremely dirty. To clean the drum, while applying cleaning
cloth (service part No. : KSMM-01) or high quality paper gently
to the upper drum, rotate the upper drum in the normal
(counterclockwise) rotation direction.
The dirt deposited on the video head can be removed by
playing a cleaning tape.
CAUTION
Do not move the cleaning paper while applying it to
the video head. Otherwise, the video head may be
damaged.
2) The lower drum tends to attract dirt on the leader section
and the linearity cannot be guaranteed when the lower drum
becomes extremely dirty. Particularly, the tape inlet and out-
put sections gather dirt easily, causing symptoms such as
dropout of the reproduced FM signal, deterioration of video
quality and lack of audio output. In order to clean the leader
section, rub a a cotton swab gently along its edge.
High-quality paper
Core drum
Fig. 2.4.2
2-6
Upper drum
Head tip
Carefully clean the lead tape
inlet/outlet.
Toothpick
Lead
Lower drum
3) Stain of the tape transport system leads to tape damage.
When magnetic dust or dirt penetrates inside the rollers, a
rotation malfunction may affect the video. Clean the tape
transport parts carefully using a cleaning cloth or cotton swab
moistened with ethyl alcohol.
Fig. 2.4.3
2.4.4 Oiling and Greasing
Table 2-4-2 shows the oil and greases used with the set.
Classification Name
Oil
Cosmo Hydro HV100
Grease Maltemp SH-P
Hanal
Table 2-4-2
1) Oiling should be performed periodically. Oil the shafts by
referring to the maintenance table.
2) After replacing a part, grease the required points. For the
parts to be greased see the exploded diagram in chapter 5,
"DISASSEMBLY DRAWINGS AND PARTS LIST".
3) As Hanal separates over time, be sure to mix it (shake) well
before use.
4) Take care not to leave grease or oil on the tape transport
parts which come into contact with the tape or on the brake
pads.
5) Take care not to apply too much oil or grease. The standard
oiling quantity is one drop and the standard greasing quan-
tity is the quantity with which the grease does not overflow.
Take special care.
Part No.
YTU94027
KYODO-SH-P
RX-410R