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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Racal 9903 / 9904 counter timer repair
As mentioned in a previous post, I have a Racal 9903 counter timer that I'm
trying to repair; I found a manual that, unfortunately, has a vital section of the schematic missing due to a bad scan, but I have determined that the LSI device IC5 is probably at fault. The IC in question is, of course, a custom part, a Ferranti manufactured 22-4601. Anyone have any idea where I might get one? Not holding out much hope as it's a 30 year old device, but you never know. Martin -- martindot herewhybrowat herentlworlddot herecom |
#2
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Racal 9903 / 9904 counter timer repair
Martin Whybrow wrote in message
news As mentioned in a previous post, I have a Racal 9903 counter timer that I'm trying to repair; I found a manual that, unfortunately, has a vital section of the schematic missing due to a bad scan, but I have determined that the LSI device IC5 is probably at fault. The IC in question is, of course, a custom part, a Ferranti manufactured 22-4601. Anyone have any idea where I might get one? Not holding out much hope as it's a 30 year old device, but you never know. Martin -- martindot herewhybrowat herentlworlddot herecom What is the fuction of the IC in block function terms ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#3
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Racal 9903 / 9904 counter timer repair
Martin Whybrow wrote in message
news As mentioned in a previous post, I have a Racal 9903 counter timer that I'm trying to repair; I found a manual that, unfortunately, has a vital section of the schematic missing due to a bad scan, but I have determined that the LSI device IC5 is probably at fault. The IC in question is, of course, a custom part, a Ferranti manufactured 22-4601. Anyone have any idea where I might get one? Not holding out much hope as it's a 30 year old device, but you never know. Martin -- martindot herewhybrowat herentlworlddot herecom that is a Racal part number it is the same LSI in my 9913 manual. Looks possible to workaround with a multiplexer plus divider TTL etc -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#4
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Racal 9903 / 9904 counter timer repair
"N Cook" wrote in message ... Martin Whybrow wrote in message news As mentioned in a previous post, I have a Racal 9903 counter timer that I'm trying to repair; I found a manual that, unfortunately, has a vital section of the schematic missing due to a bad scan, but I have determined that the LSI device IC5 is probably at fault. The IC in question is, of course, a custom part, a Ferranti manufactured 22-4601. Anyone have any idea where I might get one? Not holding out much hope as it's a 30 year old device, but you never know. Martin -- martindot herewhybrowat herentlworlddot herecom that is a Racal part number it is the same LSI in my 9913 manual. Looks possible to workaround with a multiplexer plus divider TTL etc -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ The manual I found has a missing section right down the centre where IC5 is located so I can't see all the interconnections; the circuit description indicates it acts as a counter, multiplexer and display control logic so there's a good chance it could be replaced with some TTL. I'll contact you by email about the manual as I see you have a 9911 manual on your list, hopefully it's fairly similar. Martin -- martindot herewhybrowat herentlworlddot herecom |
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