mlasham
New Member
Hi
I've a Wang APC which has seen healthier days I think.
It appears to have a number of issues which I am hoping someone here may be able to help with.
First up I am after any documentation that may help, e.g. schematics, service manual etc.
I have found some of these for the PC not APC on bitsavers though they are for a system board number 8221 and mine is a 9721 which I assume is the difference between the PC and APC models.
The schematics for the 8221 look very much the same as my system board but I dont want to make assumtions.
Now the faults are:
1. Power on, system beeps, the HDD will me a noise of some sort and then power shuts down leaving just the fan running. I've had the power supply serviced and it appears to be good.
When I remove the power connector to the main system board the HDD will then spin up and stay spinning. So it looks like an issue with the system board.
I then tested the connector for the system board and found shorts between the 5v lines and GND. When I remove the system board and test the connector again (on the back plane) the short is gone.
So it appears like I have a short of some kind.
Weirdly though , if I power cycle the machine a dozen or more times sometimes it will power up enough to start the HDD and run the POST diagnostics which leads me onto the next faults.
2. No video - I just get a raster line across the monitor
3. Post code error is 01101 which looks like an IC failure according to the Tech Refence manual for the PC (not APC so could be a wrong diagnosis - hence needed the correct manual).
Any help or guidance very much appreciated.
Thanks
I've a Wang APC which has seen healthier days I think.
It appears to have a number of issues which I am hoping someone here may be able to help with.
First up I am after any documentation that may help, e.g. schematics, service manual etc.
I have found some of these for the PC not APC on bitsavers though they are for a system board number 8221 and mine is a 9721 which I assume is the difference between the PC and APC models.
The schematics for the 8221 look very much the same as my system board but I dont want to make assumtions.
Now the faults are:
1. Power on, system beeps, the HDD will me a noise of some sort and then power shuts down leaving just the fan running. I've had the power supply serviced and it appears to be good.
When I remove the power connector to the main system board the HDD will then spin up and stay spinning. So it looks like an issue with the system board.
I then tested the connector for the system board and found shorts between the 5v lines and GND. When I remove the system board and test the connector again (on the back plane) the short is gone.
So it appears like I have a short of some kind.
Weirdly though , if I power cycle the machine a dozen or more times sometimes it will power up enough to start the HDD and run the POST diagnostics which leads me onto the next faults.
2. No video - I just get a raster line across the monitor
3. Post code error is 01101 which looks like an IC failure according to the Tech Refence manual for the PC (not APC so could be a wrong diagnosis - hence needed the correct manual).
Any help or guidance very much appreciated.
Thanks