Hi!
I've assembled a 3.5 board, so far so good, but have difficulties with EGT which shows 307/308C constantly (in megatune/vemstune) no matter what I'm doing.
First channel parts, solderblob were populated on the PCB already, second is empty.
I only soldered the sensor wire and filter cap.
Input voltage and AD597 output voltage seems OK, even MCP3208 input seems fine (0.1V at room temp), still I get constant 307C for both EGT channels.
Tried with different 1.1.x firmwares too.
Any ideas? ???
I suggest check other MCP3208 inputs - output. Easiest on inputs 6 and 7 by configuring these for launch.
Quote from: GintsK on May 16, 2009, 12:25:20 AM
I suggest check other MCP3208 inputs - output. Easiest on inputs 6 and 7 by configuring these for launch.
Input 7 is also dead (configured for ALS), another board is fine in same wiring+fw+conf. :(
I guess you have to change MCP3208. You can get one from webshop.
Gints
I've seen these die when the chip has been used as a grounding path, the thermocouple is providing a route to ground that needs to be provided by ground straps.
Yes, I guess I need to replace MCP3208 as 5V supply voltages, GND and data connections around all seems fine.
This is a board on desk without real loads (but all grounds connected) so I hope it's not killed that way. :o