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To date there are 4 version of 64 PCB assemblies in use.

Original 5 pin board
(CN5-Video port has 5 pins)
326298-01 326106
A (CR) 8 pin board
(CN5-Video port has 5 pins)
250407-04 251138
B 8 pin board
(Reduced oscillator circuit)
250425 251469
B-2 8 pin board 250441-01* 251469

These boards are interchangeable with casework, keyboard, etc.; however, care must be taken to provide the customer with a unit that is compatible with their monitor and cable.

When component level repairs are necessary, be certain to acquire the appropriate part for the board you are repairing. Most modulators are different, as are many of the components.

* The 4th version of 64 board was recently developed and only a few may be in the field. It is termed the 64B-2. All circuits remain the same as the 64B (Schematic 251469) with a few component location changes:

1) Resistors 28, 29, 30, 36, 48 were reduced to Resistor Pack RP5.
2) Diodes CR100-105 are no longer piggybacked. Their new locations are CR9, 12-16.

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This page has been created by Sami Rautiainen.
Read the small print. Last updated September 05, 2020.