[SunRescue] SS1+ no LED activity

[Mike Hebel]

Check to see if you get any output out of serial port A (TTYA).  If the
system has a problem with the keyboard, however small it may seem, it will
_only_ output any information out of the serial port.

If the serial port is a round one you can use a MAC modem cable (_not_ the
printer cable) and a null-modem adapter to connect the output of TTYA to a
PC out terminal.  If the serial port is 25-pin you should just be able to
put a null-modem adapter on it and run a standard serial cable from there to
a PC or terminal.

If you still get no output _then_ it's time to start looking for dead/bad
parts.

Mike Hebel

> >-----Original Message-----
> >From: rescue-admin at sunhelp.org [mailto:rescue-admin at sunhelp.org]On
> >Behalf Of Michael Hansen
> >Sent: Monday, November 20, 2000 7:57 PM
> >To: rescue at sunhelp.org
> >Subject: [SunRescue] SS1+ no LED activity
> >
> >
> >Is my SS1+ DOA? HELP PLEASE!!!
> >
> >I salvaged a SPARCstation 1+ which I have since spent ~$100 US
> >to replace missing parts. Much more if the monitor is included.
> >Problem is: When powered up, key board LEDs light, I hear a beep,
> >and the monitor makes all the right faint noises, but the screen
> >stays black. The 3 LEDs on the main board stay unlit.
> >
> >I have 4x Sun 4mb simms in what I am pretty sure are the right slots:
> >bank 0 (both collumns, row closest to Sbus slots, both collumns,
> >4th row from scsi connectors)
> >
> >I have a new NVRAM (yes, I put it in the right way), both the LSI
> >and Weitek PGA processor chips are in place (no visible bent leads.
> >
> >Sniff test is negative(no abnormal hot plastic smell), no discoloration,
> >obvious physical damage: everything seems to be like-new, except for
> >a little dust.
> >
> >I have a Fujitsu 500mb scsi disk set on id 3 connected to
> >the scsi connector farthest from the power supply. Nothing is
> >connected to the other scsi connector.
> >
> >I have a floppy, but I haven't put come up with a power or data
> >cable for it. (The original wiring harness for the fan and floppy
> >power is gone. I have an old-style (dual slot) cgsix frame buffer
> >in slot 2 and 3. No load board is present. Slot 1 is empty.
> >
> >When I power it up, a red light goes on in the power supply. When
> >I stick a DVM (Fluke model 29, so I'm pretty sure it's accurate)
> >on the power supply leads(PS removed from system box)  the red 5v leads
> >show 5.02v, but the blue 12v leads seem to show about ~1.3v (the brown
> >-12v leads are -1.3v) Is that what it should be with no load?
> >
> >Summary: no LEDs light up on main board. Only extra loads are hard disk
> >and frame buffer (no FDD), red led is on inside power supply when hooked
> >up to main board.
> >
> >Question: Is 1x ~1995 vintage scsi drive enough load to have power
> >supply work properly, or does it look like the main board is dead?
> >
> >Thanks,
> >Mike
> >
> >
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