Adjustment procedures
1) Tune the TV set to receive a digital pattern unless
AA: 36.8MHzotherwise noted.
2) Press the OK buttons on both of Control Board andB: 38.0MHz
remote controller at the same time then you can find
On Screen Display. (Refer to the following Fig.4).B
3) Press PR+ or PR- button for desirous function
adjustment.
4) Press VOL+ or VOL- button for correct picture.
5) Press OK button to memorize all the adjusted data.
6) Press TV/AV or POWER on/off button on the remote
controller to exit from the SVC mode.
Fig.3: AFT waveform on Alignment Scope[LINE SVC1] PR1
: RF AGC (Auto Gain Control)AdjustmentH-CENTER 07
V-CENTER 04
Test Point: J150(on Main Board) / J151
VLIN 17
Adjust:VRI1 / VRP1VAMP 93
SCOR 90
The RF AGC control (VRI1 / VRP1 VRP1 ) was aligned at the time
of manufacture for optimum performance over a wide
range conditions. Readjust of VRI1 / VRP1 should not beFig.4VRP1
necessary unless unusual local conditions exist, such as:
1) Channel interference in a CATV system. Horizontal center adjustment
2) Picture bending and/or color beats, which are unusually1) Select H-CENTER.
due to excessive RF signal input when the receiver is2) Adjust so that the horizontal center line of digital pattern is
too close to a transmitting tower or when the receiverin accord with geometric horizontal center of the CPT.
is connected to an antenna distribution system where
the RF signal has been amplified.
In this case, the input signal should be attenuated (withVertical center adjustment
pad or filter) to a satisfactory level.1) Select V-CENTER.
3) Picture noise caused by "broadcast noise" or weak2) Adjust so that the vertical center line of digital pattern is in
signal. If the broadcast is "clean" and the RF signal is ataccord with geometric center of the CPT.
least 1mV (60dBuV), the picture will be noise free in any
area.
Vertical linearity adjustment
Adjusting the VRI1/ VR1P (RF AGC) control to one end ofVRP1
rotation will usually cause a relatively poor signal to noise1) Select VLIN.
ratio;2) Adjust so that the upper half and lower half of the circle of
Adjusting to the other end of rotation will usually cause athe digital pattern are equal.
degradation of over load capabilities resulting in color
beats or adjacent channel reference.
For best results, adjust the VRI1/ VR1P control whileVRP1
performing on all over local channels, or the voltage atVertical amplitude adjustment
J150(Main Board) / J22P (PIP Board : OPTION) will beJ22P
60!0 1Vdc in RF level 60!1dBuV1) Select VAMP. |
ACEC
