Panasonic CT-1388YD Service Manual page 24

Check purity:
In service mode (red "CHK" is displayed), place a jumper in AG connector, press the recall button on the remote
control to enter to the white purity field check, remove the jumper, press recall again to get to red, green and blue
purity fields (if jumper is not removed for color fields, they will be displayed with higher luminosity),
In aging mode ( factory mode , yellow "chk" is displayed), connect a jumper in ag connector, press the recall button
on the remote control to enter the purity field check mode.
Press RECALL repeatedly
to display the fields.
BLUE
SCREEN
Entering service mode (back-open method, all models)
1. While the receiver is ON and operating in normal mode, momentarily
short test point FA1 (TP8) to Cold Ground (
The receiver enters the aging mode .
Yellow letters "CHK" appear in the upper left corner of the CRT.
2. Simultaneously press the action and the volume up buttons on the
receiver control panel.
The receiver enters the service mode.
The letter in "CHK" turn red.
(The volume Up/Down will adjust normally).
(All costumer controls are set to nominal level).
NORMAL
SCREEN
GREEN RED
SCREEN SCREEN
Figure 21. Purity Check Field Mode.
Helpful Hints
(The volume Up/Down will adjust rapidly).
IMPORTANT NOTE:
Always exit the service mode
following adjustments.
JUMPER IN AG
CONNECTOR
RECALL
REMOVE
JUMPER FROM
AG CONNECTOR
) FA2 (TP3) A-Board.
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RECALL
WHITE
SCREEN