Precautions for Proper Use

INTRODUCTION

•Supply voltage

Make sure that the power is between 11 V and 15 V DC. If the power voltage is too low, abnormal color and increased noise may occur.

•Allowable ambient temperature and humidity

Be sure to use this device within the allowable tempera- ture range of 0°C to 40°C and a relative humidity of 30% to 80%. Using this device at a temperature or humidity out- side the allowable ranges could result not only in malfunc- tion but the impact on the CCD elements could be serious as small white spots may be generated.

•Strong electromagnetic waves or magnetism

Noise may appear in the picture or audio and/or the colors may be incorrect if the camera is used near a radio or tele- vision transmitting antenna, in places where strong mag- netic fields are generated by transformers, motors, etc., or near devices emitting radio waves, such as transceivers or cellular phones.

•Use of wireless microphone near the camera

When a wireless microphone or wireless microphone tuner is used near the camera during recording, the tuner could pick up noise.

•Avoid using or placing this device in places;

•subject to extreme heat or cold;

•with excessive dirt or dust;

•with high humidity or moisture;

•subject to smoke or vapour such as near a cooking stove;

•subject to strong vibrations or on an unstable surface;

•also do not leave this device for long hours in a parked car under direct sunlight or near room heating equip- ment.

•Do not leave this device where it is subject to radiation or X-rays or where corrosive gasses occur.

•Protect this device from being splashed with water (espe- cially when shooting in the rain).

•Protect this device from being wet when shooting on a beach.

In addition, salt and sand may adhere to the camera body. Be sure to clean the camera after use.

•Protect this device against penetration of dust when using it in a place subject to sandy dust.

•Optical performance of lens

Due to the optical performance of the lens, color diver- gence phenomena (magnification chromatic aberration) may occur at the periphery of the image.

This is not a camera malfunction.

•Noise may appear in the viewfinder when switching between the playback picture and the EE picture.

•Use this device in an upright position.

If placed on its side, heat release efficiency will deterio- rate, adversely affecting the tape transport. Depending on circumstances the tape may also be damaged.

•Vibrations

Colors may fail to appear and/or the image and sound may be disturbed during VTR playback in locations sub- jected to strong vibrations.

•Precautions for transportation

Do not drop or hit this device against a hard object.

•Remove the videocassette before transporting this device.

•Do not insert an object other than a videocassette in the cassette insertion slot. Be sure to close the cassette cover when this device is not to be used for a long period.

•Do not set the POWER switch to OFF or remove the power cable during recording or playback. Otherwise the tape may be damaged.

•The sensitivity level of the provided microphone is set lower than the reference input (–60 dBs) setting.

•When this device is not in use, be sure to set the POWER switch to OFF in order to reduce power consumption.

•Cleaning the body: Wipe body with a dry, soft cloth. To prevent deformation of the body, etc. and to avoid opera- tion hazards, do not allow volatile liquids such as benzine and thinner to touch the body, and do not wipe it with a cloth soaked in such a liquid. When it is extremely dirty, soak the cloth in a solution of neutral detergent, wipe the body with it, and then use a clean cloth to remove the detergent.

•The camera may not show stable pictures in the period immediately after the power is turned on, but this is not a malfunction.

•A sound occurs when the built-in head cleaner that runs when you load or eject a videocassette operates, but this is not a malfunction.

•The LCD monitor and the viewfinder screen

The LCD monitor and the viewfinder screen are manufac- tured using high-precision technology. Black spots may appear on the LCD monitor and the viewfinder screen, or red, blue, green and/or white spots may not turn off. How- ever, this is not a malfunction and these spots are not recorded on the tape.

•If you use this device continuously for a long period of time, the characters displayed in the viewfinder may tem- porarily remain on the screen. This is not recorded on the tape. In addition, they are no longer displayed if you turn the power off and then on again.

•If you use this device in a cold location, the images may appear to lag on the screen, but this is not a malfunction. This is not recorded on the tape.

•Do not insert fingers or foreign objects into the cassette insertion slot as this may result in personal injury or dam- age to the mechanism.

•To prevent damage to the connectors, use this device with the connector covers on when you are not using the video/ audio signal output connectors.

CAUTION

•Do not point the lens or viewfinder directly at the sun or other strong light source.

•Eye damage could result.

•If the lens or viewfinder is left pointed at the sun, rays may collect inside this device and cause damage or a fire.

•When carrying the camera, be sure to hold the carrying handle. Holding the lens or viewfinder may result in damage.

Routine and Periodical Maintenance

The GY-HD250/GY-HD251 incorporates precision mechani- cal parts, which will collect dirt, wear out and deteriorate as this device is used. After this device has been used for a long period even in a normal environment, the heads, drums and tape transport mechanisms also collect dirt. Especially, dust which penetrates the inside of the VTR section during out- door use will promote the wear and deterioration of mechani- cal parts by causing poor contact between tape and heads or failing 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, cleaning with a head cleaning tape alone is not enough for cleaning the entire tape transport mechanism, so it is also recommended to apply periodical maintenance (inspection) to prevent 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 pictures and sound, be sure to use a head cleaning tape to clean the head periodically. X See “Precautions for Use of Head Cleaning Tape”. 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.

Block Noise

•Please use cleaning tape produced by JVC. Do not use head cleaning tapes other than specified.

X See “Precautions for Use of Head Cleaning Tape” about how to use the head cleaning tape and precautions for use of the head cleaning tape.

•When dust adheres to the heads, the warning message “HEAD CLEANING REQUIRED!” is displayed on the LCD monitor, and in the viewfinder during playback and record- ing check using the RET button on the lens section.

Periodical Maintenance

Contents : Check or replace the following mechanical parts according to the running time.

Usage Time	500H	1000H	1500H	2000H
Drum assembly (includ-	G	E	E	F
ing heads)	G	E	E	F
ing heads)
Tape guides, rollers	G	E	E	F
Belt gears	H	E	E	F
Drive parts	H	H	E	F
G: Clean, check and adjust.

E: Clean and check. Replace as required.

F: Replace.

•The maintenance contents vary depending on the operat- ing environment and method. Therefore, the data in the chart should be considered as a reference.

Time management

The accumulated running time of this device can be con- firmed with the hour meter display (which shows the accu- mulated drum and fan motor running time). X See “How to Display the Hour Meter” on page 111.

For consultations related to the maintenance planning or cost, please contact the person in charge of professional video equipment at your nearest JVC-authorized service agent.

Precautions for Use of Head Cleaning Tape

Please use cleaning tape produced by JVC.

Adhere to the following precautions when using the head cleaning tape.

1.Insert the cleaning tape.

Press the PLAY/STILL button after the cleaning tape is fully loaded.

The tape runs for 10 seconds at a time in the PLAY mode. (The tape stops automatically and then this device enters the STOP mode.)

2.Do not use the tape more than four times at the most for each cleaning.

Use the following chart as a guide for periodical head cleaning.

	Low	Room	High
Running	temperature	temperature	temperature
Operating envi-	0°C to 10°C	10°C to 35°C	35°C to 40°C
ronment
Yardstick for	1 to 2 times ev-	1 to 2 times ev-	1 to 2 times ev-
use of cleaning	ery 5 hours	ery 20 to 30	ery 5 hours
tape		hours

Note 1) When used in a low humidity environment, head cleaning should be conducted at intervals half of those given in the chart above.

Note 2) If an M-DV80 tape is used immediately after head cleaning, the “HEAD CLEANING REQUIRED!” indicator may remain on. In this case, let the tape run as the indicator will turn off after the tape has run for a while.

Note 3) Use the cleaning tape in the room temperature (10°C to 35°C).

Note 4) The cleaning tape case contains instructions for use of the cleaning tape. However, some of these instructions differ from the contents of this sheet. When using the cleaning tape, please follow the instructions of this sheet.

Note 5) If the “HEAD CLEANING REQUIRED!” does not disappear after repeated head cleanings, the recording tape may be abnormal. Avoid excessive repeated use of the head cleaning tape.