TTECorporation R&D Center (Shen’Zhen Lab)
Chassis Name
M28
SP
(G8)
Serial No.
Issued on
2006-06-02
Updated on
2007-3-21
Version
3.1
Flowchart chart of alignment procedure for M28 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 M28 CHASSIS:
I) Adjustment of B+ voltage(for
VR840
model only)
1. Apply 180V-240VAC(
r
5V) to mains power input, and Philips standard testing pattern to RF input.
2. Check in STANDARD mode until voltage at TP2 (B+) is 112V
r
2.5V.adjust the jp840,jp841..
II) The alignment of RFAGC <Press KEY 7 IN D-Mode>
1. Connect the detector shown below to collector of Q101.
2. Receive a grey scale signal with 70dB
ȝ
V amplitude.
3. Adjust RFAGC item until the output of the detector becomes 0.8Vpp
Collector
of Q101
To CRO
7
