r
ADJUSTMENTS (continued)
For authorized personnel only j
2.3 Horizontal Frequency adjustment
Set monitor into Geometry Alignment mode via
MENU.
Select external synchronization (
SYNC
key) and use
CON UP & DOWN
keys to adjust horizontal
free-running frequency (see also page 34 to 35).
2.4 On-board adjustmentsforgeometry
Available on-board adjustments for geometry are :
P4 HORIZONTAL SHIFT
P5 HORIZONTAL AMPLITUDE CENTRE VALUE (factory adjusted)
P7 BOWING
P8 SKEWING
P9 TRAPEZIUM
P10 VERTICAL AMPLITUDE CENTRE VALUE (factory adjusted)
L5 HORIZONTAL LINEARITY
3
PAL Decoder / RGB board (Decoder section)
3.1 Synchronization
Apply a PAL colour bars signal to
INPUT
1.
Set the monitor to calibrated position by pressing the key
CAL.
Connect the Channel 1 of an oscilloscope to the colour bars signal (looped through with the
INPUT 1
of the monitor) and trigger the scope with that signal. Take care of good 75 ohms termi-
nation.
Connect the probe of Channel 2 of the oscilloscope to TP5.
Make a short-circuit with J4 and adjust P1 for zero beat of the sandcastle pulse signal.
Connect the probe of Channel 2 of the oscilloscope to TP10 and check the horizontal sync
the keyboard.
Select 'Normal Picture' again.
pulses in the position 'Normal Picture , Horizontal Delay and Pulse Cross' by pressing
DEL
on
3.2 Decoderchromabandfifteradjustment
Apply a video sweep signal to INPUT 1.
Connect the probe of the oscilloscope to TP18.
Adjust L4 , L5 and L6 for a maximum at 3 MHz and 5 MHz.
3.3 Notchfilteradjustment
Apply a PAL colour bars signal to
INPUT
1.
Connect the probe of the oscilloscope to TP11.
Adjust L1 for minimum chroma on the luminance signal.
Apply a 2T-bar signal to
INPUT
1.
Connect the probe of the oscilloscope to TP13.
Adjust L2 , L3 and C48 for symmetrical and equal bottom distortion and a 2T-amplitude of
minimum 96% of the bar signal.
39
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