Canon LV-7255 LV-7255_manual.pdf - Page 72

7. Appendix ᕨ Troubleshooting Check List Before contacting your dealer or service personnel, check the following list to be sure repairs are needed, you may also refer to the "Troubleshooting" section in your user's manual. This checklist below will help us solve your problem more efficiently. * Print the following pages. Frequency of occurrence Ⅺ always Ⅺ sometimes (How often other Power No power (POWER indicator does not light green) See also "WARNING Indicator (WARNING)". Power cord's plug is fully inserted into the wall outlet. Main power switch is pressed to the ON position. Lamp cover is installed correctly . Shut down during operation. Power cord's plug is fully inserted into the wall outlet. Lamp cover is installed correctly . Power Management is turned off (only models with the Power Management function). Lamp counter (lamp operation hours) was cleared after lamp replacement. Sleep Timer is turned off (only models with the Sleep Timer function ). No power even though you press and hold the POWER button for about 1 second. Video and Audio No image is displayed from your PC or video equipment to the projector. Still no image even though you connect the projector to the PC first, then start the PC. Enabling your notebook PC's signal output to the projector. Parts of the image are lost. Still unchanged even though you press the AUTO PC button. Still unchanged even though you carry out "Factory default" in the projector's menu. • A combination of function keys will enable/disable the external display. Usually, the combination of the "Fn" key along with one of the 12 function keys turns the external display on or off. No image (blue background, logo, no display). Still no image even though you press the AUTO PC button. Image is shifted in the vertical or horizontal direction. Horizontal and vertical positions are correctly adjusted on a computer signal. Input source's resolution and frequency are supported by the projector. Some pixels are lost. Still no image even though you carry out "Factory default" in the projector's menu. Image is flickering. Still unchanged even though you press the AUTO PC button. Signal cable's plug is fully inserted into the input connector A message appears on the screen The source connected to the projector is active and available. Still no image even though you adjust the brightness and/or the contrast. Input source's resolution and frequency are supported by the projector. Image is too dark. Remains unchanged even though you adjust the brightness and/or the contrast. Image is distorted. Image appears to be trapezoidal (unchanged even though you carry out the "Keystone adjustment"). Other Still unchanged even though you carry out "Factory default" in the projector's menu. Image shows flickering or color drift on a computer signal. Image appears blurry or out of focus. Still unchanged even though you checked the signal's resolution on PC and changed it to projector's native resolution. Still unchanged even though you adjusted the focus. No sound. Audio cable is correctly connected to the audio input of the projector. Still unchanged even though you adjusted the volume level. AUDIO OUT is connected to your audio equipment (only models with the AUDIO OUT connector). Remote control does not work. No obstacles between the sensor of the projector and the remote control. Buttons on the projector cabinet do not work ( only models with the Key lock function). Key lock is not turned on or is disabled in the menu. Projector is placed near a fluorescent light that can disturb the infrared remote controls. Still unchanged even though you press and hold the BACK button for a minimum of 10 seconds. One or more remote sensors are enabled (only models with the Remote Sensor Selection function). Batteries are new and are not reversed in installation. If present on the remote control, projector selector switch is not used. 63