- 19 -
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 Serviceman 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.
7.
Press the Power Button on the Remote Control to select one of Service Adjustment Modes.
1) B= Service VCJ SUB-DATA adjustments.
2) C= Service VCJ CUT-OFF adjustments.
3) S= Service OPTIONS (PICTURE) adjustments.
4) M= Service MTS adjustments.
5) P= Service VCJ adjustments.
6) X= Service AFC adjustments
6) “CHK” = Normal operation of CHANNEL
and VOLUME
.
Exiting the Service Mode:
Press the Action and the Power buttons on the Receiver simultaneously for at least 2 seconds.
THE RECEIVER EXITS SERVICE 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 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 (Aging mode is used in the factory for quick operation).
An address Menu appears in the right
hand corner of the screen
B 00 33
C 00 1 255
b
a
b
a
Note:
Only the applicable
settings for the Receiver
serviced will be available (See
a
in Fig. 20).
Figure 20. Service Mode Menu Adjustments.
IMPORTANT NOTE:
Always Exit the Service Mode
Following Adjustments.
Summary of Contents for CT-20R6CE
Page 55: ... 55 ...
