MS 2 processor repair

[trakkies]

Does anyone - preferably UK - offer a repair service for the MS2 processor? I have no output on one injector bank. My 'scope shows pulses present on pin21, but not 22.

[trakkies]

Decided to have a go at replacing the processor myself - nothing to lose, after all.

The manual says its a MC9S12 C64MFA. The one on mine is a C64CFAE I've found a supplier with a big range. Should I use the exact replacement - or is there an even later one?

[DonTZ125]

I can't comment on the chip codes, but my first thought is to get it as close as possible to avoid any "undocumented feature" issues.

I believe DIYAutoTune, Symtech Labs, and jmscortina (on the Extra forum) all do daughter card repairs; the first two are in the States, while James is in the UK.

[trakkies]

Tried the UK places with no success. However, I'm a fairly experienced constructor, and I'm certain it is that chip which is faulty, so I might as well save the money and do it myself. A new daughter board costs about 120 gbp over here.

[DonTZ125]

One of the comments I've seen a few times with repairing the MS2 card is the need for a BDM cable to install the bootloader onto a new chip. I don't see a good thread on this forum; this thread on MS/Extra seems to be the best.

[trakkies]

Ah - didn't realise there was more to it than just fitting the chip and code in the normal way. I'll have to find out how much it will cost to get a USBDM in/to the UK.

[trakkies]

I've ordered up the Wytec USBDM, and even with the extortionate P&P to the UK ( $24, so more than the unit itself) it's still a whole lot cheaper than a new daughter board. Let's hope I don't get caught for import duty too.

I'm hoping I can follow the instructions for use given in the 'Extra' thread. Unless someone here can give an easy step by step version?