JVC DLA-G20U DLA-G20U User instruction manual (2.6MB) - Page 67

Troubleshooting (Cont.) Symptom Video image is abnormally dark or bright. Color is poor or unstable. The upper part of the video image bows or distorts. Probable cause Corrective action • Is picture quality (color density, etc.) adjusted correctly? • Adjust picture quality on the menu. • Is the correct CLAMP selected? • Select the correct CLAMP on the OPTION MENU. • Is picture quality (color density, etc.) adjusted correctly? • Adjust picture quality on the menu. • Is the correct broadcast system (color • Set the broadcast system (color system) selected? system) to AUTO. • Are signals (scanning frequency, etc.) to • Check if the signal is appropriate 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 Isn't a wrong source (forced mode) problem still persists, set it to the selected? correct dedicated source (forced mode). • While computer system signal is input, • Input separate sync signals for vertical isn't a sync signal for composite sync sync (V) and horizontal sync (H) (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 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 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 does not work. • Are batteries installed correctly? • Are batteries exhausted? • Match the polarities of batteries correctly (+ to + and - to -). • Replace with new batteries. • Is there a shielding object between the remote control unit and the remote sensor? • Is the distance too long? • Remove any shielding objects. • Use the remote control unit at a nearer point. Page 40 44 40 36 19 47,49,54 12 47,49,54 29 14 14 18 18 s 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