Do I need to solder LH Autoauthority EPROM?
03-02-2006, 11:44 PM
#1
Racer
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Do I need to solder LH Autoauthority EPROM?
I just received a set of Autoauthority chips for my '86. The EZK was easy and the chip installs into the socket. Is this the same for the LH on an early number '86 or do I have to solder it in? How do you take the LH board out of the housing?
03-03-2006, 12:14 AM
#2
Addict
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There is no need to solder the memory chip into the Porsche 928 LH.
It is a little more difficult to access the EPROM site with the 25 pin LH. First pry the tabs out of the slots that hold the lid in place - be careful, there are only so many "cycles" of bending that these tabs can take before they'll break off. After you remove the ALL the screws (two on the connector side) and the two on the bottom that hold the heat spreader in contact to the base, the lid will lift off.
After you remove the lid you'll see is the bottom of the PCB. On the side opposite of the connector are three prongs that hold the PCB in place. Very gently pull back on these prongs to release the PCB. Once the PCB is free of the tabs, pull gently back and the connector will slide through the case and the PCB will be free of the housing. You should be able to see the EPROM - some modules have a little clip over the EPROM to keep it from coming loose. If it has hte clip, you'll need to gently pry it off the ERPOM socket.
It is best to remove DIP chips with a special puller. If you don't have one of those, you can use a very small flat blade screwdriver to pry up each end of the EPROM - but do it in very small increments from each end of the socket to avoid bending the EPROM pins.
It is a little more difficult to access the EPROM site with the 25 pin LH. First pry the tabs out of the slots that hold the lid in place - be careful, there are only so many "cycles" of bending that these tabs can take before they'll break off. After you remove the ALL the screws (two on the connector side) and the two on the bottom that hold the heat spreader in contact to the base, the lid will lift off.
After you remove the lid you'll see is the bottom of the PCB. On the side opposite of the connector are three prongs that hold the PCB in place. Very gently pull back on these prongs to release the PCB. Once the PCB is free of the tabs, pull gently back and the connector will slide through the case and the PCB will be free of the housing. You should be able to see the EPROM - some modules have a little clip over the EPROM to keep it from coming loose. If it has hte clip, you'll need to gently pry it off the ERPOM socket.
It is best to remove DIP chips with a special puller. If you don't have one of those, you can use a very small flat blade screwdriver to pry up each end of the EPROM - but do it in very small increments from each end of the socket to avoid bending the EPROM pins.
03-03-2006, 01:08 AM
#4
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Radio Shack has a $8.59 eprom puller kit. The thin black prong tool can be dipped in liquid rubber and used to pull relays, you have to bend the prongs a little to fit around the relay body. The other tool in the kit is suitable for inserting the chips. I had more trouble protecting the prongs and getting them lined up, etc. putting the chip in than when pulling. They are delicate and "even" pressure is necessary. This is what the tool will provide.
03-03-2006, 01:29 AM
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Thanks Rich, Malcolm and Steve. The advice you gave was dead on. I just took it for a ride with the new chips and it is awesome. It revs much faster and higher and you can feel the increased torque. What everyone says is true.
