Emax

My emax rack did this and it turned out to be a bad connection to the  
power supply on the AC connector.

Regards,
Ted

On Jul 9, 2009, at 12:17 AM, Donavan wrote:





Hi guys,

My Emax hasn't been function again lately. I saw a posting by Jimmy  
Moore with a link to a german site about using an AT PSU. The  
description of the LCD corrupting and LED blinking is what struck me.  
My LCD goes blank, sometimes with some corrupt text visible, there is  
a whine that is comeing from the area of the keyboard by the LCD, and  
also all the LEDs light up and a CRC message can appear though this  
happens inconsistently.

My question is what is the acceptable voltage variance? The  
diagnostics document I have say the VR1 can have +/- 5% variance, so  
on the required +5VDC a range of 4.75-5.25 is with in specs.

Also, someone mentioned that the LCD (emulator_island?) that the LCD  
can make this whine, but to your knowledge will this cause the other  
problems?

Thanks

Emax Specs
Verify +12V on orange wire.

Verify +SV on yellow wire.

Verify -l2V on purple wire.

Verify + 10V on pin 3 of Q2.

My Test Results20DCV meter setting
At psu connector at board connector
orange 11.94V 11.94V
purp -11.9V -11.9V
yellow 4.96V 4.94V

Floppy
orange 11.94 Yellow 4.94

200m meter setting
Floppy
green - 41 blue/Purp/Wht - 5.1

Q2 visible circuit path pin
1 - 10.04
2-11.93

3-10.72

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