Troubleshooting (Cont.)

Symptom

Probable cause

Corrective action

Page

Video image is

• Is picture quality (color density, etc.)

• Adjust picture quality on the menu.

40

 

abnormally dark or

adjusted correctly?

 

 

 

 

 

 

bright.

 

 

 

 

 

• Is the correct CLAMP selected?

• Select the correct CLAMP on the

44

 

 

 

 

 

OPTION MENU.

 

 

 

Color is poor or

• Is picture quality (color density, etc.)

• Adjust picture quality on the menu.

40

 

unstable.

adjusted correctly?

 

 

 

 

 

 

 

 

 

 

 

• Is the correct broadcast system (color

• Set the broadcast system (color

36

 

 

system) selected?

system) to AUTO.

 

 

 

 

• Are signals (scanning frequency, etc.) to

• Check if the signal is appropriate

19

 

 

connected devices appropriate?

(scanning frequency, etc.), and input

 

 

 

 

 

the appropriate signal.

 

 

 

 

• Is the source setting correctly selected?

• Set the source setting to AUTO. If the

47,49,54

 

Isn’t a wrong source (forced mode)

problem still persists, set it to the

 

 

 

 

selected?

correct dedicated source (forced

 

 

 

 

 

mode).

 

 

 

The upper part of the

• While computer system signal is input,

• Input separate sync signals for vertical

12

 

video image bows or

isn’t a sync signal for composite sync

sync (V) and horizontal sync (H)

 

 

 

distorts.

(Cs) or G on sync being input?

signals.

 

 

 

 

• Isn’t signal with much jitter or skew

• Input signals with little jitter or distor-

 

 

 

 

distortion being input to a video deck?

tion.

 

 

 

 

• Is the source setting correctly selected?

• Set the source setting to AUTO, or to

47,49,54

 

Isn’t a wrong source (forced mode) or

the correct dedicated source (forced

 

 

 

 

channel selected?

mode) or channel.

 

 

 

 

 

 

 

 

 

Video image and

• Are video picture and audio turned off

• Turn on video picture and audio by

29

 

audio sound suddenly

by pressing the AV MUTING button on

pressing the remote control’s AV

 

 

 

go out.

the remote control unit?

MUTING.

 

 

 

 

 

 

 

 

 

Remote control unit

• Are batteries installed correctly?

• Match the polarities of batteries

14

 

does not work.

 

correctly (+ to + and - to -).

 

 

 

 

• Are batteries exhausted?

• Replace with new batteries.

14

 

 

 

 

 

 

 

 

• Is there a shielding object between the

• Remove any shielding objects.

18

 

 

remote control unit and the remote

 

 

 

 

 

sensor?

 

 

 

 

 

• Is the distance too long?

• Use the remote control unit at a nearer

18

 

 

 

point.

 

 

 

 

 

 

 

 

 

When the emergency indicator starts blinking:

Refer to the CAUTIONS and NOTES on page 25.

*This projector is equipped with a microcomputer that may operate abnormally due to interference from external components. If this happens, turn off the main power and disconnect the power cord from the wall AC outlet. Then reconnect the power cord to AC outlet and turn on the main power again.

(For the turning on and off the power, see pages 25 to 26.)

Maintenance

• Stains on the cabinet

Should be wiped off with a soft cloth. If the cabinet is heavily stained, wipe it with a cloth soaked in water-diluted neutral detergent and wrung well, then wipe clean with a dry cloth.

Since the cabinet may deteriorate in quality, become damaged or get its paint peeled off, be careful about the following:

Do not wipe it with a hard cloth.

Do not wipe it strong.

Do not wipe it with thinner or benzene.

Do not apply any volatile substance such as insecticides to it.

Do not allow any rubber or vinyl article to remain in contact with it for a long time.

Stains on the lens

Sould be cleaned off with commercially available blowers or lens cleaning paper (for cleaning glasses and cameras). Do not use liquid cleaning agents. This could cause the surface coating to be removed.

Do not rub or hit the lens as its surface is prone to damage.

66

Page 67
Image 67
JVC DLA-G20U manual When the emergency indicator starts blinking, Maintenance

DLA-G20U specifications

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