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Service 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 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:
At times 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 button twice to exit menus.
4. Tune to the Channel 124.
5. Adjust VOLUME to minimum (0).
6. Press the VOL
button (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 the Action and the Volume Up buttons
on the Receiver simultaneously will toggle between the modes. Red "CHK" for Service and yellow "CHK" for
Aging.
7. Press the Power Button on the Remote Control to select one of six Service Adjustment Modes.
1)
B= Service VCJ SUB-DATA ADJUSTEMENT.
2)
C= Service VCJ CUT-OFF ADJUSTMENT.
3)
S= Service OPTIONS (PIP and CLOCK) ADJUSTMENT.
4)
M= Service MTS ADJUSTMENTS.
5)
X = Service COMB FILTER ADJUSTMENT.
6)
"CHK" = Normal operation of CHANNEL
Note: Only the applicable settings for
the Receiver serviced will be
available (See a in Fig. 14).
Exiting the Service Mode:
Press the Action and the Power buttons 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.
THE RECEIVER EXITS SERVICE MODE.
IMPORTANT NOTE:
Always Exit the Service Mode
Following Adjustments.
and VOLUME
.
a
b
32 B 0
An address Menu appears in the right
hand corner of the screen
Figure 14. Service Mode Menu Adjustments.
- 14 -
a
b
2
215 C 0