Alignment Procedure of M123A Color TV
1. FLOWCHART OF ALIGNMENT PROCEDURE
2 Adjustment of B+ voltage
1) Apply 120VAC(
±
5V) to mains power input, and Philips standard testing pattern
to RF input.
2) Adjust VR830 in STANDARD mode until voltage at TP2 (B+) is 106V
±
0.5V.
3. RF AGC adjustment
Observe monitor the collector waveform of Q101 with the probe of Oscilloscope as
illustration below. Select channel 2 (>70dB) from the antenna input. Enter D-mode,
select menu6 to adjust RFAGC item until the monitor peak value to 0.8V
p-p
.
IN60
3Pf
输出
输入
4. Screen & Focus voltage adjustment
Apply pattern signal in normal status, enter D
①
-mode, press “TV/AV” button to turn
off the vertical output.
Adjust the SCRREEN switch on the flyback transformer to make a horizo
②
ntal
shining line just visible on the screen.
Turn on the vertical output, adjust the “FOCUS” on the flyback transformer to
③
obtain the optimum focus.
5. White balance adjustment
1)Apply the black and white pattern in normal status;
2)Alignment of normal color temperature
①
Change Color Temperature to normal status
②
Use a color analyzer to measure the black side of the screen. By changing the
value of RC, GC and BC, set the reading of the color analyzer to X=284, Y=299.
B+
adjustment
AGC
Screen & Focus
adjustment
White balance
adjustment
Sub-brightness
adjustment
Pincushion correction &
Horizontal Amplitude
adjustment
Center & Amplitude and
OSD adjustment
INPUT
OUTPUT
