33960RE: [midatlanticretro] LA120 Destination^Wfaults unknown
- Jan 15, 2014On Wed, 15 Jan 2014, Brian Schenkenberger, VAXman- wrote:
> Cory Smelosky <b4@...> writes:As far as I can tell...as the behaviour is unpredictable and the processor
>> On Tue, 14 Jan 2014, Cory Smelosky wrote:
>>> Yes. I didn't notice them before. The ONLINE, LOCAL, and PAPER OUT
>>> lights are also lit. The line-feed motor is running as well as the
>>> advance knob has resistance.
>>> The "4" switches between position 3 and position 4 sometimes in relation
>>> to the cover switch and sometimes at random.
>> Quick update before I forget: If I remove the 32V fuse, the head will
>> reposition itself. If I have it installed, the logic comes up but the
>> head does not reposition itself.
> 32V fuse? What is its designation on the schematics?
>> The logic must be keeping the carriage return motor off? Hmmmmm.
> Perhaps, the position sensor in the motor housing (beneath the black cap on
> its end toward the read of the LA120 is bad or dirty (it's optical).
sometimes comes out of reset, and sometimes go further...the PSU is
operational...but not stable.
The random +12 I was reading drops to +5.71 when connected to the board.
If I am correct with it being a CMOS NE555 I /think/ high on output would
be +12V as it is powered from the +12V rail. I wouldn't imagine +5.71V
being "low" though...
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