Canon projector LV7255 User Manual

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7. Appendix
 PC Control Codes and Cable Connection
PC Control Codes
Function Code Data
POWER ON 02H 00H 00H 00H 00H 02H
POWER OFF 02H 01H 00H 00H 00H 03H
INPUT SELECT COMPUTER-1 02H 03H 00H 00H 02H 01H 01H 09H
INPUT SELECT COMPUTER-2 02H 03H 00H 00H 02H 01H 02H 0AH
INPUT SELECT VIDEO 02H 03H 00H 00H 02H 01H 06H 0EH
INPUT SELECT S-VIDEO 02H 03H 00H 00H 02H 01H 0BH 13H
NO SHOW ON 02H 10H 00H 00H 00H 12H
NO SHOW OFF 02H 11H 00H 00H 00H 13H
SOUND MUTE ON 02H 12H 00H 00H 00H 14H
SOUND MUTE OFF 02H 13H 00H 00H 00H 15H
Cable Connection
Communication Protocol
Baud rate ........................................ 19200 bps
Data length ..................................... 8 bits
Parity .............................................. No parity
Stop bit .......................................... One bit
X on/off .......................................... None
Communications procedure ........... Full duplex
NOTE: Depending on the equipment, a lower baud rate may be recommended f\
or long cable runs.
NOTE: Contact your local dealer for a full list of the PC Control Codes \
if needed.
To RxD of PC
To GND of PC To TxD of PC
1
2 3
6
7
8
4
5
SERVICE PORT (Mini DIN-8P)
NOTE: Pins 2, 3, 5, 6 and 8 are used inside the projector. 
						

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7. Appendix
\b 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.
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.
•A combination of function keys will enable/disable the ex-
ternal display. Usually, the combination of the “Fn” key along with one of the 12 function keys turns the external displayon or off.
No image (blue background, logo, no display).
Still no image even though you press the AUTO PC button.
Still no image even though you carry out “Factory default” in
the projector’s menu.
Signal cables 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 sources resolution and frequency are supported by the
projector.
Frequency of occurrence     always     sometimes (How often?_____________________)      other (__________________)
Power
No power (POWER indicator does not light green)   See also “WARN-
ING Indicator (WARNING)”. Power cords plug is fully inserted into the wall outlet.
Main power switch is pressed to the ON position.
Lamp cover is installed correctly .
Lamp counter (lamp operation hours) was cleared after lamp
replacement.
No power even though you press and hold the POWER button
for about 1 second.Shut down during operation.Power cords 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).
Sleep Timer is turned off (only models with the Sleep Timer
function ).
Video and Audio
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”).
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.
Image is shifted in the vertical or horizontal direction.
Horizontal and vertical positions are correctly adjusted on a
computer signal.
Input sources resolution and frequency are supported by the
projector.
Some pixels are lost.
Image is flickering.Still unchanged even though you press the AUTO PC button.
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 resolu-
tion 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 mod-
els with the AUDIO OUT connector).
Other
Remote control does not work.
No obstacles between the sensor of the projector and the re-
mote control.
Projector is placed near a fluorescent light that can disturb the
infrared remote controls.
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.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.
Still unchanged even though you press and hold the BACK but-
ton for a minimum of 10 seconds. 
						

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7. Appendix
In the space below please describe your problem in detail.
Information on application and environment where your projector is usedProjectorModel number:
Serial No.:
Date of purchase:
Lamp operating time (hours):
Lamp Mode:  Normal    Quiet
Information on input signal: Horizontal sync frequency [          ] kHz
Ve rtical sync frequency [          ] Hz
Sync polarity H   (+)    (–)
V    (+)    (–)
Sync type  Separate    Composite
  Sync on Green
W ARNING Indicator:
Steady light  Orange    Green
Flashing light [          ] cycles
Remote control model number:
Signal cable Canon standard or other manufacturer’s cable? Model number:                        Length:              inch/m
Distribution amplifier Model number:
Switcher Model number:
Adapter Model number:
Projector PC
D VD player
Installation environment
Screen size: inch
Screen type:  White matte     Beads    Polarization
  Wide angle     High contrast
 Throw distance: feet/inch/m
 Orientation:  Ceiling mount     Desktop
Power outlet connection:  Connected directly to wall outlet
 Connected to power cord extender or other (the num-
ber of connected equipment______________)
 Connected to a power cord reel or other (the number
of connected equipment______________)
Computer Manufacturer:
Model number:
Notebook PC   / Desktop  
Native resolution:
Refresh rate:
Video adapter:
Other:
Video equipment VCR, DVD player, Video camera, Video game or other
Manufacturer:
Model number: 
						

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