E-9
Routine and Periodical Maintenance
The GY-DV300 incorporates precision mechanical parts, which will collect dirt, wear out and deteriorate
as the unit is used. On the other hand, when the unit has been used for a long period in a normal
environment, the heads, drums and tape transport mechanisms also accumulate dirt that is deposited on
them. Furthermore, dust which penetrates the inside of the VCR section especially during outdoor use
will promote the wear and deterioration of mechanical parts by causing poor contact between tape and
heads or failure to maintain the video and audio quality at high levels. To prevent wear and deterioration,
clean the mechanical parts using a head cleaning tape as routine maintenance. However, as cleaning
with a head cleaning tape alone is not enough for cleaning the entire tape transport mechanism, it is also
recommended to apply periodical maintenance (inspection) to prevent troubles that may be caused by
the sudden occurrence of failure. As the replacement, adjustment and servicing of parts require advanced
skill and equipment, please consult the person in charge of professional video equipment at your nearest
JVC-authorized service agent.

Head Cleaning

●To maintain beautiful video and sound, be sure
to use a head cleaning tape to clean the head
periodically. (Read “Precautions for Use of Head
Cleaning Tape” on page 10.) If head cleaning is
not performed periodically, a type of mosaic noise
called block noise may appear in the picture or
sound may be interrupted.
●Use the optional head cleaning tape M-DV12CL.
Do not use other than the dºesignated head
cleaning tapes. For instructions on how to use
the head cleaning tape and precautions for its use,
read “Precautions for Use of Head Cleaning T ape”
on page 10.
●When dirt adheres to the video heads of the GY-
DV300, the warning message “HEAD CLEANING
REQUIRED!” appears on the LCD screen and
the viewfinder screen during edit search in the
recording mode and during playback.
Block Noise

Periodical Maintenance

Contents: Check or replace the f ollowing mechanical
parts according to the running time.
Running Time
500H
1000H 1500H
2000H
Drum assembly 
(including heads)
Head cleaner 
Tape guides & rollers

Rotary encoder ––
Belts & gears ––
Drive parts 
: Clean, check and adjust.
: Clean and check. Replace as required.
: Replace.
•The maintenance contents vary depending on
the operating environment and method.
Therefore, the above data should be considered
as a reference.
Time management
The accumulated running time of the unit can be
confirmed with the hour meter display (which shows
the accumulated drum running time). For details,
see “Displaying the Hour Meter Display” on page
104.
For consultations related to the maintenance
programming or cost, please contact the person
in charge of professional video equipment at
your nearest JVC-authorized service agent.
HEAD CLEANING
REQUIRED!