Table of Contents
Advertisement
CRT cut-off and Sub-Brightness adjustment
l
R853: R- bias control
l
R859: G- bias control
l
R865: B- bias control
l
R857: G-drive control
l
R863: B- drive control
Note:
Prior to this adjustment, warm up the unit with
the beam current of more than 600uA for more
than 30 minutes
Receive " MONOSCOPE PATTERN" signal with
1.
pattern generator.
2
Set R857 (G-driver control) at CENTER (5110)
position
Set R863 (B-driver contol) at CENTER (5/10)
position.
Set R853 (R-biascontrol) at MIN (O/10) position.
Set R859 (G-bias control) at MiN (O/l 0) position.
Set R865 (B-bias control) at MIN (O/IO) position.
3.
Set the control at the " Normal" position that
contrast is Max (15x15), colour is center (7/l 5)
and brightness is center (7/15) using control,
4.
Set the screen control at MIN (O/l 0) position.
Turn on 5401 (service switch) at the horizontal
5.
C o n n e c t t h e o s c i l l o s c o p e t o T P 8 5 2 ( R e d
6.
cathode).
7.
Adjust the sub-brightness control (R425) so that
the blanking pulse on oscillosope is 10 + 1 Vp-p.
,
,
8.
Slowly turn the screen control clockwise and
slightly, in one of the three colours.
9.
Carefully adjust the vias controls of the other
two colours until the horizontal raster becomes
white.
the horizontal rester disappears, and stop it.
White balance/Back ground
l
R436: Sub-Contrast control
Note:
Prior to this adjustment, warm up the unit
with the beam current of more than 600).1A
for more than 30 minutes.
1. Receive " MONOSCOPE PATTERN" signal with
pattern generator.
2. Set the Contrast control and MAX position.
3. Set the brightness control at MAX position.
4. Connect beam ammeter to TP601 and TP602.
(Full scale: 3mA)
5. Adjust the sub-contrast control (R436) so that
the beam current becomes approx. 0.8mA
(rough adjustment).
6. Adjust the drive-control (R857, R863) so that the
colour temperature is at 7500°K. (High beam:
7. Adjust the contrast control and brightness
control so that the beam current is about
is at 7500°K. If the temperature is not at 7500" K,
go back to " CRT cut-off adjustment" and repeat
the adjustment.
Sub-contrast control: R436
Note:
Prior to this adjustment, warm up the unit
with the beam current of more than 600uA
for more than 30 minutes.
Receive " MONOSCOPE PATTERN" signal with
1.
pattern generator.
2.
Set the Contrast controls at MAX position.
Set the brightness control at MAX positin.
3.
4.
Connect beam ammeter to TP601 (-) and
TP602 (+). (Full scale: 3mA)
Adjust R436 so that the beam current becomes
5.
PAL chroma adjustment
Note:
Before this adjustment, the PIF/AFT/AGC
adjustment must have been completed.
l
R806: 1 H-delay amp control
l
Receive " PAL COLOUR BAR" signal with colour
1.
bar generator.
Connect the following resistance matrix to
2.
pins 0 and @ of the connector (K), to which
an oscilloscope is connected.
Resistance Matrix
43
p
i
n @ o
f
K
)
Advertisement
Table of Contents
