1
Flowchart chart of alignment procedure for M28L(G2) chassis:
B+ adjustment
Electrical
properties
checking for
chassis
RF
AGC
adjustment
Sub-brightness
Adjustment
White
balance
Adjustment
Aging Adjustment
of
screen voltage
and focus
Sub-color
&
Sub-tint
adjustment
Pincushion
and screen
width
adjustment
Screen
center
& size
adjustment
(PAL)
Screen center
& size
adjustment
(NTSC)
QC checking
ALIGNMENT PROCEDURE FOR M28L(G2) CHASSIS:
I) Adjustment of B+ voltage(for
VR840
model only)
1. Apply 160-240(110-220)VAC(
r
5V) to mains power input, and Philips standard testing pattern to
RF input.
2. Adjust VR840 in STANDARD mode until voltage at TP2 (B+) is 112V
r
0.5V.
II) The alignment of RFAGC
1. Connect the detector shown below to collector of Q101.
2. Receive a grey scale signal with 70dB
Ӵ
V amplitude.
3. Adjust RFAGC item until the output of the detector becomes 0.8Vpp
Collector
of Q101
To CRO
5
、
Alignment Procedure
