Quote:
Originally Posted by Heatercathodeshort
That monster started life as a little 203T 14" table model!
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Hi John,
That's right, in fact the main chassis is quite compact. Additional metalwork is added to accommodate the wider control panel used in the 21" models.
The OA60 vision detector checks OK. However, two additional germanium diodes are employed in the video amplifier, W106 (OA70) and W102 (OA61). A short circuit in the PCF80 video amplifier valve has resulted in the failure of W102 the OA61 vision interference limiter diode. It's gone short circuit. For the time being there is no need to replace this diode.
The other diode W106 functions as an extra white spot limiter and is employed only in the 21" models. An additional feature on schedule B 21" models is a picture quality control which takes the form of a variable resistor R233 (2Kohms) in series with the vision detector load resistor.
DFWB.