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Post by mastertech on Jun 29, 2014 13:55:31 GMT -5
Ok, good. So no problem there, lol.
Now I hope the Eeprom is in a place where you can test it while powered up. If not let me know and we will look to test somewhere else.
Eeprom is IC404, 8 pin ic. Pins 1 to 4 are all gnd so you can use any one of them for the neg probe. DMM on DC voltage and test for voltage on pins 5 to 8. Let me know your readings.
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Post by jeremy on Jun 29, 2014 14:33:31 GMT -5
IC404 is on the bottom of the CPU board, when I power it up the board has to be installed because of the jumper card that goes between the mainboard and the CPU board. If there is somewhere else I can test on top I can get the readings
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Post by mastertech on Jun 29, 2014 14:53:43 GMT -5
How about the main processor chip, ic401? Accessible or not?
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Post by jeremy on Jun 29, 2014 15:10:59 GMT -5
Not accessable  |
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Post by mastertech on Jun 29, 2014 15:47:51 GMT -5
D409?
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Post by jeremy on Jun 29, 2014 16:06:49 GMT -5
That one is on top
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Post by mastertech on Jun 29, 2014 16:36:25 GMT -5
Check both sides for voltage.
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Post by jeremy on Jun 29, 2014 17:11:12 GMT -5
+5.0vdc on one side, +5.75vdc on the other side
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Post by mastertech on Jun 29, 2014 20:19:37 GMT -5
Are you able to probe pin 10 of CP415? Should be around +5v.
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Post by jeremy on Jun 29, 2014 21:18:49 GMT -5
Pin 10 on CP415 is +4.44vdc
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Post by mastertech on Jun 29, 2014 21:38:12 GMT -5
Can you check that same voltage on the working CPU board?
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Post by jeremy on Jun 29, 2014 21:46:54 GMT -5
Sure can, let me crack it open and ill post the readings
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Post by jeremy on Jun 29, 2014 22:16:53 GMT -5
okay checked on the good unit and that pin has +4.285vdc
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Post by mastertech on Jun 30, 2014 10:32:00 GMT -5
All that looks fine. We are starting to run out of possibilities.
See if you can test for voltage on both sides of R433.
It is to bad you cannot test pins right on ic401. It would make it much easier.
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Post by jeremy on Jun 30, 2014 11:12:38 GMT -5
+4.76 on one side, and +5.23 on the other side of R433. I can't really think of an easier way to get to IC401
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