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To Check Purity:
When Receiver is in Service Mode (red “CHK” is
displayed), place a jumper in the AG connector
between the terminals (shorting FB signal to ground).
Press the Recall Button on the Remote Control to
enter the White Purity Field Check Mode. Remove the
jumper from the AG connector and press Recall
repeatedly to toggle the Receiver into the Red/Green/
Blue Purity Field Check Modes.
Note: if jumper is not removed, colors will be displayed
at high luminosity.
In Aging Mode (factory mode, yellow “CHK” is
displayed), place a jumper in the AG connector
between the terminals. Press Recall on the Remote
Control to enter the Purity Field Check Mode.
Helpful Hints
Entering Service Mode (Back-Open Method)
1.
While the Receiver is ON and operating in Normal Mode, momentarily
short test point FA1 (TP8) to Cold Ground (
) FA2 (TP3) A-Board.
The Receiver enters the Aging Mode
.
Yellow letters “CHK” appear in the upper left corner of the CRT.
(The Volume Up/Down will adjust rapidly).
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 customer controls are set to nominal level).
Press Recall again to select desired field.
NORMAL
SCREEN
WHITE
SCREEN
RED
SCREEN
GRN.
SCREEN
BLUE
SCREEN
Figure 15. Purity Check Field Mode.
IMPORTANT
Always Exit the Service Mode
Following Adjustments.
Note: Only applicable settings for
the Receiver serviced will be
available.
