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P4428 Setup

This assumes an essentially working camera with video out, ~450mA current consumption, visible heaters and CRT image Setup requires AVO and dual channel scope. A video display and power supply to give battery input is also worthwhile. As the camera itself does not have voltage regulation, the actual battery box for the camera has to be used in setup as settings do depend on the 8.7V power input. Connect the output video to scope channel B and trigger from this at TV line or field rates as necessary.
Camera Chassis (original model) showing the scanning / high voltage PCB side of the camera.
Camera Chassis (original model) showing the video PCB side of the camera.
Camera Chassis (original model) showing the underside of the camera.

Full manual links:

Front with descriptions of the design, basic checks, disassembly and setup
Circuits and layout of PCB with adjustments
Rear regulator PCB, all parts lists and detailed fault checklists.

Setup process

Extracted from front section of the manual with scope photos and additional comments. Items in square brackets are the differences for the newer SMT board set.
When running in this state, some high voltages are exposed. These are harmelss but mildly painful to those in good health. Do not wear a wrist strap and do not attempt if you have a pacemaker.
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 current is greater than 500mA after the target discharge period suspect a fault.  
3 Set line flyback to 10us, measure on Q100 tag [TP103] adjust RV100.
This should give a 60V clean pulse shape as shown
4 Set trailing edge of blanking to lead flyback by 3˝us, measure on Q211 gate or V202 pin10 [TP111], adjust RV117.
5 Check G2 » 170V (Measure on D103)
Check G4 » 130V (Measure on socket P108)
Check G3 » 80V (TP105) Adjust using RV109. If beam and pedestal are off, initially set to 85V so it drops back to 80V
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 4uA using RV111 (G1). Measure using a 3.5mm jack socket on the scan board and 50uA meter. Socket is at 130V.  
8 Set pedestal by setting head amp output to 175mV measured at R219/R220 [TP6] on the video board adjust RV110 on Scan board.
This will increase the beam current.
9 Centralise circular image with alignments and horizontal shift controls RV102, RV103 and RV101.
Set vertical amplitude of image with RV112 and horizontal amplitude with L100
[Horizontal adjustment requires change to number of turns on coil] to obtain a circular target of 38 to 42ěs width.		  
10 Focus G2 aperture spot in centre of picture using RV116.
The small feature arrowed will be seen as you pass through tube electrical focus.
11 Recheck the setting of G3 and items 7 to 10 above as these are interactive.  
12 Reduce circular blanking size RV206 and adjust circle shape RV207 for a circle on a monitor raster set to 3:4 ratio.
The circle should be 34.7ěs wide and 15.8ms or 13.4ms high (625/525 TV systems respectively)		  
13 Check video at L201 [TP5] and adjust the shading controls to achieve as flat a signal as possible
Adjust RV203, RV201 for correction at line rate.



Adjust RV202, RV205 for correction at field rate.

14 Switch to chop mode and set video signal to 1.3V measuring at L201 [TP5] on the video board adjusting RV204.  
15 Switch to Pan mode and set video signal to 1.3V measuring at L201 [TP5] on the video board adjusting RV200.
[No longer required].		  
16 Turn on flicker suppressor with RV212.  
17 Set period of clock pulse to 43us measured on pin 11 of V214 [pin 3 of IC13] adjusting RV209.  
18 Adjust RV212 to minimise vertical patterning. Effect may only be visible on an external monitor.  
19 Open circle (RV206) until top and bottom of stored area is visible. Centralise stored area (RV211).
In the case of a 525 line camera only the top stored area will be visible, so RV211 may be set fully clockwise. Reset circle.
20 Switch camera to chop mode and adjust RV210 to the centre of the range where there is no picture noise.
[Switch camera to chop, no adjustment required]		  
21 Adjust RV208 to give minimum flicker.  
22 Switch to pan mode. Check "park" position of shutter blade with the black section in the shutter sensor and with the shutter clear of the tube-lens gap.
Check output of sensor is approximately 3V measured at R173 [or TP113].		  
23 Switch to 'chop' mode and check sensor output is locked to field rate and swings below 2V and above 6V measured at R173 [or TP113].
Select R170 for an error pulse of 0 to 2ms on V108.5 [TP112].
24 Switch to pan. Check operation of iris and adjust sensitivity using RV118.  
25 Adjust internal monitor scans and shifts (RV119, L101 RV108, RV104 and rear magnets), for a circular and central image.  
26 Adjust brightness and contrast of internal monitor (RV107 and RV106).  
27 Check and adjust optical focus by moving yoke assembly. Check yoke rotation.
28 Check LED battery indicators. Adjust RV115 for offset and R114 for range [no adjustment].
Rail drop out point should be below 9.2V.		  
29 Check overall quality of picture and mechanical assembly.  


This image shows some microphony bands (arrowed) which is a tube artefact where vibrations also create a signal from the tube. With a really bad one you can shout at it.


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Heritage TICs EEV P4428 setup page 20 November 2020  All tradename © respective owners