Panasonic CT-24SL14J Service Manual page 13

11 Service mode (electronic adjustments)
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 performed
by 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
familiar with 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:
1. Select SET-UP icon and select CABLE mode.
2. Select TIMER icon and set SLEEP time for 30 Min.
3. Press "ACTION" twice to exit menus.
4. Tune to the channel 124.
5. Adjust VOLUME to minimum (0).
6. Press VOL → (decrease) on receiver. Red "CHK"
appears in upper corner.
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 service and yellow "CHK" for aging.
7. 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.
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 (TP1 pin 2) to cold
ground (TP1 pin 3).
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).
Note:
If service mode is accessed by this method be sure to
reset the set after service is performed.
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