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Serviceman Mode (Electronic Controls)
This Receiver has electronic technology using the I²C
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 Serviceman Adjustment
Mode.)
Note: It is suggested that the technician reads all the
way through and understand the following
procedure for Entering/Exiting the Serviceman
Adjustment Mode; then proceed with the
instructions working with the Receiver. When
becoming familiar with the procedure, the Flow
Chart for Serviceman Mode may be used as a
quick guide.
Quick Entry to Serviceman Mode:
When minor adjustments need to be done to the
electronic controls, the method of Entering the
serviceman 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.
Note: After Receiver is set into SERVICEMAN mode,
set TIMER back to NO.
7.
Press Power on the Remote Control to select
one of seven Serviceman Adjustment Modes.
1. B= Serviceman VCJ SUB-DATA ADJUSTMENTS.
2. C= Serviceman VCJ CUT-OFF ADJUSTMENTS.
3. D= Serviceman GEOMETRIC ADJUSTMENTS.
4. S = Serviceman S OPTION ADJUSTMENTS.
5. X = Serviceman GEOMAGNETIC
ADJUSTMENTS.
6. “CHK” = Normal operation of CHANNEL
and VOLUME
.
Exiting the Serviceman Mode:
Press
Action and Power on the Receiver
simultaneously for at least 2 seconds.
THE RECEIVER EXITS SERVICEMAN MODE.
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.
To Check Purity:
Press Recall on the Remote Control when in
Serviceman Mode (red “CHK” is displayed) to enter the
Purity Field Check Mode.
To toggle between Aging and
Serviceman 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 Serviceman and
yellow “CHK” for Aging.
Helpful Hints
Entering Serviceman Mode (Back-Open
Method)
•
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).
An address Menu
appears in the right
hand corner of the
screen
32 B 0
b
a
Figure 17. Serviceman Mode Menu Adjustments.
IMPORTANT NOTE:
Always Exit the Serviceman Mode
Following Adjustments.
Press RECALL again to select desired field.
NORMAL
SCREEN
WHITE
SCREEN
RED
SCREEN
GRN.
SCREEN
BLUE
SCREEN
Figure 18. Purity Check Field Mode.
