Alignment Procedure - Toshiba TCL M28LG2 Service Manual

5、Alignment Procedure
Flowchart chart of alignment procedure for M28L(G2) chassis:
B+ adjustment
Sub-brightness
Adjustment
Pincushion
and screen
width
adjustment
ALIGNMENT PROCEDURE FOR M28L(G2) CHASSIS:
I) Adjustment of B+ voltage(for VR840 model only)
1. Apply 160-240(110-220)VAC( 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 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 V amplitude.
3. Adjust RFAGC item until the output of the detector becomes 0.8Vpp
White balance
Adjustment
Screen center Screen center
& size
adjustment adjustment
(PAL)
Collector
of Q101
Electrical
properties
checking for
chassis
Aging Adjustment of
screen voltage
and focus
QC checking
& size
(NTSC)
To CRO
1
RF AGC
adjustment
Sub-color &
Sub-tint
adjustment