15 Service mode (electronic adjustments)
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This receiver has electronic technology using the IC bus concept. It performs as a control function and it replaces many mechanical controls. Instead of adjusting mechanical controls individually, many of the control functions are now performedby using “on screen display menu”. (The service adjustment mode).
NOTE
It is suggested that the technician reads all the way through and understand the following procedure for entering/exiting the service adjustment mode; then proceed with the instructions working with the receiver. When becoming familiarwith the procedure, the flow chart for service mode may be used as a quick guide.
Quick entry to service mode
When minor adjustments need to be done to the electronic controls, the method of entering the service mode without removal of the cabinet back is as follows using the remote control:
Select SET-UP icon and select CABLE mode.
Select TIMER icon and set SLEEP time for 30 Min.
Exit menus.
Tune to the channel 124.
Adjust VOLUME to minimum (0).
Press VOL → (decrease) on receiver. Red “CHK” appears in upper corner.
After receiver is set into service mode, set TIMER back to NO.
To toggle between aging and service modes:
While the “CHK” is displayed on the left top corner of the CRT, pressing “ACTION” and “VOL” UP on the TV simultaneously will toggle between the modes. Red “CHK” for serviceand yellow “CHK” for aging.
Press POWER on the remote control to display the service adjustment modes menu, select adjustment by pressing the volume right/left buttons and channel up/down buttons on the remote and ACTION to enter the adjustment.
Some adjustments are available only in some modes (480i, 480p, 1080i); it is needed to apply the format. A 1080i, 480p, 480i pattern can be obtained from Panasonic’s TU-DST51 set-top box DTV decoder.
Exiting the service mode:
This TV goes out from service mode when it is unplugged or turned OFF. To exit the service mode, turn the TV OFF or unplug the TV from A.C.
Other method
Press ACTION and POWER on the receiver simultaneously for at least 2 seconds.
The receiver momentarily shuts off; then comes back on tuned to channel 3 with a preset level of sound.
Any programmed channels, channels caption data and some others user defined settings will be erased when exited by pressing ACTION and POWER on receiver.
IMPORTANT NOTE
Always check that the TV exits the service mode.
To confirm colors
When in service mode (red “CHK” is displayed) press RECALL on the remote control to enter the purity field check mode
Entering service mode (open-back method)
While the receiver is connected and operating in normal mode, momentarily short test point FA1 (A15 pin 2) to cold ground (A-Board).
The receiver enters the aging mode.
Yellow letters “CHK” appear in the upper left corner of the screen. (The volume right/left and channel up/down will adjust rapidly).