[HECnet] Re: LA120 PSU fault (fwd)

[Clem Cole]

I believe that the prints for the H7150 are in the Field Maintenance Print Set  


Manx
	   	DECwriter III LA120 Operator Reference Card, 1978
	   	LA120 Technical Manual, January, 1980
	   	LA120 User Guide, May, 1984
	   	LA120 Field Maintenance Print Set, October, 1979
	   	


On Sat, Dec 28, 2013 at 2:15 PM, Cory Smelosky <b4 at gewt.net> wrote:
Afternoon,

I've managed to acquire an LA120!   Woohoo!

However, it had some issues...as was discussed when I got it. ;)

I've replaced the blown fuse, the there is continuity for the pico fuse on
the PSU...but I have no idea if that indicates it works or not.   The only
thing that runs is the fan.

What are some test points I can try?   Also...what is the value for the
picofuse?   I have 125V 1.5A fuses...but I think it needs higher current.

I tested to see which voltages are preset:
+5
-12
-24.

No +12 or +24.

Anyone have full schematics for the H7110 PSU, or know enough about it to
help me debug this one?

Alternatively, I can get an H7150 for $95 on ebay.   Can an H7150 be tossed
in an LA120-AA?
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects