Date: Sun, 19 May 2002 09:13:54 +0300
From: Vesku <>
Subject: Re: Saab 9000 direct ignition cartridge

Johannes H Andersen wrote: > > > Vesku wrote: >> >> Has somebody disassembled the system and replaced/rewired the coils of >> the system ? >> >> Or studied the cartridge and looked if the faults are most probably on >> coils of the system / or in 400 V step up ? >> >> (Yes I know that according to service manuals nobody can repair the DI >> cartridge and it always should be replaced when some problem expected, >> just asking those who really understand the electronics systems and know >> that almost everything can be repaired ;) >> >> br Vesku > > I took mine apart and found that the 400 V step up transformer had burned > through. The inside of the DI unit was completely gummed up in a black > insulating substance. Other DI units are oil filled. That makes it > difficult to make a stable repair job that can stand up to temperatures > and vibrations. And where do find a replacement transformer with the > correct spec for the job? > Thank you, Johannes Due to high price and limited availability of replacement cartridges, and probably problems likely with replacement units from junkyard, I like to consider building a system which would take spark pulses which come from DI/APC, and replace cartridge with 4 (or 2) 12 V coils and "normal" ignition modules. I found some info in Townsend but it was schematic only, no descriptions of signals. Is there any info about signals between DI/APC and spark cartridge available ? And comments about this replacement idea generally ? br Vesku

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