DaveC wrote:

80's vintage German printing equipment (offset press industry) uses a
video plug-in card (made by the manufacturer of this equipment) to
generate parameter display for the operator. The display is a standard
baseband video tube monitor. (It is possible, being German and sold in the
USA market, that the video may be NTSC or PAL.)

There is no video signal on the BNC output connector.

This is used equipment being resurrected, so operational history is
unknown.

There is a place on the video card labeled "Q2" that is the right shape &
size for a crystal can. The pads look like it was ripped off the board: a
short lead soldered in one pad; a hole in the other pad where a lead was
soldered (poorly, apparently!). (Rough handling is a distinct possibility:
the client is a used-equipment dealer and the fork lift is their main
tool...).

The board is populated with 80's technology, mainly 74LS' :: the crystal
pads connect to an 'LS04 inverter/driver and then to an 'LS96
parallel-to-serial converter. The 'LS96 spec sheet says that it can be
driver up to 25 MHz.

The board uses a 8275 CRT controller, and in the datasheet it says: "CCLK
is a multiple of the dot clock and an input to the 8275."

Maybe these clues will tell someone what frequency this crystal needs to
be...?

What frequency crystal should I be looking for?
Put in ANY frequency, as long as it is known. Fire the gear up, and
observe the video output with a scope. measure the horizontal sync
frequency. Now, you can easily figure the ratio (up or down) to
get the desired H sweep freq, and most simple monitors should sync
to it, even if the number of vertical lines is a bit off.

Jon