Electrical Setup
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14. P4428 CAMERA ELECTRICAL SETUP PROCEDURE
Items in square brackets are the differences for the new SMT boards
1.
Before switching on turn G1 pot RV111 anti-clockwise
[clockwise] and pedestal pot RV110 clockwise [anticlockwise].
Select pan mode. Turn flicker suppressor off by setting RV212
fully anticlockwise.
2.
Switch camera on and note current consumption, if greater than
500mA after the target discharge period suspect a fault.
3.
Set line flyback to 10µs, measure on Q100 tag [TP103] adjust
RV100.
4.
Set trailing edge of blanking to lead flyback by 3½µs, measure
on Q211 gate [TP111] adjust RV117.
5.
Check G2
≈
170V (Measure on D103)
Check G4
≈
130V (Measure on socket P108)
Check G3
≈
80V (TP105) Adjust using RV109
Check heater voltage on P 104 pins 3 to 6 [ or across 8.7V and
R200] and change R200 if required to achieve 5.9 -6.0V across
the Pevicon heater.
6.
Open circular blanking (RV206).
7.
Set beam current to 4µA using RV111 (G1). Measure using a
3.5mm jack socket on the scan board and 50µA meter.
8.
Set pedestal by setti ng head amp output to 175mV measured at
R219/R220 [TP6] on the video board adjust RV110 on Scan
board.
9.
Centralise circular image with alignments and horizontal shift
controls RV102, RV103 and RV101. Set vertical amplitude of
image with RV112 and hori zontal amplitude with L100
[Horizontal adjustment requires change to number of turns on
coil] to obtain a circular target of 38 to 42µs width.
10.
Focus G2 aperture spot in centre of picture using RV116.
11.
Recheck the setting of G3 and items 7 to 10 above as these are
interactive.
