PEDESTAL LEVEL ALIGNMENT
Tune
in a black and White Signal. The receiver should
have been operating at least minutes before proceeding
with Pedestal Level Alignment.
Connect
power
plug through the isolation transformer
to power supply.
STEP
PROCEDURE
1
Set the Brightness control to mid. positions.
2
Set the R-Drive, G-Drive and B-Drive controls to mid range.
3
Set the and B Bias controls to minimum (fully
4
Connect oscilloscope to collector of red output transistor
Connect a short clip lead between
and
6
Adjust the Pedestal control
to make the pedestal level be aligned with the pulse level (A) of the waveform drawn on an
oscilloscope.
7
Adjust the white balance in such manners as in page
J-J-
( A )
Waveform “A”
q0
0 0
SUB-COLOR
PEDESTAL LEVEL
0
PEDESTAL
Figure
Pedestal Level Alignment
Summary of Contents for 8C221
Page 28: ...PRINTED WIRING BOARD ASSEMBLIES I Figure 18 PWB A Component Side 28 ...
Page 29: ...Figure 19 PWBA Wiring Side 29 ...
Page 30: ...Figure 20 FWB B Component Side 30 ...
Page 31: ...Figure 21 PWB B Wiring Side 31 ...
Page 32: ... PWBF0491CE ...
Page 33: ...Figure 26 PWB E Component Side Figure 27 PWB E Wiring Side 33 ...
Page 34: ...Figure 28 PWM A Component Side Figure 29 PWM A Wiring Side 34 ...
Page 40: ... I 8 VPP W 1 2 WXJ H I 3 3 4Vpp H 1 4 6 4Vpp U I I 51 WPP t 0 1 ...
Page 46: ...S H A R P 46 ...