Sharp 21F-PA18 Service Manual page 22

No. Adjustment point
3 SUB-
BRIGHTNESS
(to be done
after screen,
white balance
adj)
(12C BUS
CONTROL)
4 SUB-
CONTRAST
(to be done
after screen,
white balance
adj,
sub-bright-
ness adj)
(I 2 C BUS
CONTROL)
5 Beam Current
Check
Adjustment procedure/conditions
1) In Window Pattern Signal condition.
2)
Using Minolta Color Analyzer CA-100, let the
gun point at Dark White position (as attach
drawing), adjust V06 Bus data until
LUMINANCE Y = 3 ± 0.5 cd/m2.
1) In Window Pattern Signal condition.
2)
Using Minolta Color Analyzer CA-100, let the
gun point at White position (as attach drawing),
adjust V04 Bus data until LUMINANCE Y = 160
± 10cd/m2
1) Receive the "Monoscope Pattern" signal.
2) Press R/C to set Picture NORMAL condition.
3) Connect the DC miliammeter between TP 603
( + ) & TP 602 ( - ).
(Full Scale: 3mA Range)
4) Beam current must be within 1100 ± 100
21F-PD250 / 21F-PT220 / 21F-PA18 / 21F-PA18(B)
µ
A .
3 – 19
Waveform and others
WINDOW PATTERN SIGNAL
Dark White
WINDOW PATTERN SIGNAL
White