E-8
INTRODUCTION
This unit uses consumables or components that will wear off. If a worn-out or deteriorated component
continues to be used, it may cause the unit to break down. To prevent this, perform routine mainte-
nance using the head-cleaning tape. With the head-cleaning tape alone, however, the entire tape-wind-
ing mechanism cannot be completely cleaned.
Perform regular maintenance of the components as shown below.

Regular maintenance

The tasks of maintenance involved are similar to that of replacing the engine oil or tire of a car.
Depending on the number of usage hours, inspect or replace the components as follows:
Usage Time :You can check the drum usage time with the hour meter display. For
details, refer to page 83, “Checking the hour meter”.
Maintenance consultation :For details on the maintenance plan and fee, consult with your JVC-
authorized service agent.

Head cleaning

•Recording or playing back with a dirty head
will result in block noise or disrupted sound.
Perform regular head cleaning to maintain
superior image and sound quality.
•For information on how to use the head
cleaning tape and the relevant remarks,
refer to Xpage9, “Cleaning tape”.
•If the head is dusty, “HEAD CLEANING
REQUIRED!” will be displayed on the moni-
tor when this unit plays a tape.
Regular maintenance
Number of hours 500H 1000H 1500H 2000H G:Cleaning, inspection and adjust-
ment
E:Cleaning and inspection; Replace-
ment if necessary
F:Replacement
Work and frequency of maintenance
depend on the environment and
usage. The above information serves
only as a guide.
Drum assembly
(including head) GEEF
Tape guide, roller GEEF
Belt gears — EEF
Drive system parts ——EF
Block Noise
HEAD CLEANING REQUIRED!
E-9
Use a JVC cleaning tape.
Follow the instructions below for using the clean-
ing tape.
1.Run the tape for 10 seconds in the PLAY
mode. (Thereafter, it stops automatically
and enters the STOP mode.)
•After loading the cleaning tape, press the
PLAY button.
2.For a single cleaning session, it can be
repeated up to 4 times.
3.Refer to the following table as a guide for
cleaning.
Note
zUnder low humidity conditions, (10% RH to
30% RH), perform head cleaning at intervals
of half of the periods stated in the table.
zIf an M-DV80 tape is used immediately after
cleaning, the message, “HEAD CLEANING
REQUIRED!” may not disappear. It does only
after the tape has run for some time.
zUse the cleaning tape at room temperature
(10°C to 35°C).
zInstructions for using the cleaning tape stated
on a sheet inside its storage case may be dif-
ferent in part from those stated here.
Follow the instructions in this manual.
•
When this unit is moved from a cold to a
warm place abruptly, the vapor in the warm
air will come into contact with the head drum
or the tape guides, which are not warmed
enough. When chilled, the vapor turns into
droplets of water. This state is known as
condensation. When condensation occurs,
the videotape adheres to the head drum or
the tape guides and will be damaged.
•Condensation occurs on this unit in the fol-
lowing circumstances:
*It is moved abruptly
from a cold place to
a warm place.
*
It is used in a place
immediately after the
heater has been turned
on, or when cold
breeze from an air-con-
ditioner blows onto it.
*It is used at a place
of high humidity.
•When condensation occurs, the monitor
displays the following warning:
Leave the unit with the power ON and wait
until the WARNING message disappears.
•Prevention of condensation
When transporting BR-HD50 from a cold to
a warmer place abruptly, first remove the
cassette tape. Then place BR-HD50 in a
plastic bag and seal it before transporting.
Take out BR-HD50 from the sealed plastic
bag only after it has the same temperature
as the surroundings.
Cleaning tape
Operating environ-
ment
Low temperature
5°C to 10°C
Room temperature
10°C to 35°C
High temperature
35°C to 40°C
Frequency of cleaning 1 to 2 times every 5
hours
1 to 2 times every 20 to
30 hours
1 to 2 times every 5
hours
Condensation
When a cassette tape is loaded, do not transport
e.g., from a cold outdoor place to a warm room thus
subjecting the unit to drastic temperature changes.
After moving the unit, do not use it until the inner
mechanism stabilizes.
Videotape
Head drum
CONDENSATION ON DRUM