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Heidenhain DRO question

I've got an old Heidenhain DRO, LS500 scales and the simple low, flat display like a cassette deck on my Omnimil. The display has failed on one axis.I picked up a slightly later counter, type VRZ 731B thinking it might do the job, but the sockets for the scales are 9-pin as against 7-pin on the existing scales. Anyone know if the two are fundamentally incompatible, or whether they could be made to work together with a bit of rewiring? Alternatively, anyone know of someone in the NW who might be able to look for the fault in the old display?

Thanks

Tim

Reply to
Tim Leech
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I've now established, after a bit of digging on the Heidenhain site, that the extra pins are for a 'reference pulse', there was a version of the LS500 (LS 500R) which used this facility, also a 9-pin version without it. The main signals are apprently similar. The question then becomes 'will the newer display work without the reference pulse?' BTW my scales are 6-pin, not 7-pin. Monday morning brain malfunction

I've accepted a kind offer off-list to look at the duff display.

Cheers Tim

Reply to
Tim Leech

Tim,

I have the 731B display (2 axis) and afaik the reference pulse is only used with the memofix switch feature which enables the positioning to be recovered after a power loss. I've got lazy over the years and very rarely take the precaution of writing down the reference settings for each job which is a prerequisite for recovering location after the power loss.

I would hazard a guess that rewiring your old scales to the correct pinout for the 731B would work OK.

If I can be of help by measuring anything on my 731 for you then please feel free to ask.

If by any chance your volunteer repairer (or indeed anyone else) has circuit info on the 731 I would dearly like a copy. My display is 17 plus years old and not knowingly missed a beat in that time but I'd feel happier with a circuit diagram should the day ever dawn that i need to fault find.

Good Luck

Bob

Reply to
Bob Minchin

Thanks for that, Bob. I'll let you know how I get on.

Cheers Tim

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Reply to
Tim Leech

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