What kind of past history before the fail? Lightning, dropped, in storage
for years or found it in the dumpster?

You could have bad solder on the main CPU chip....or even on the display,
especially if there are signs of a liquid spill. Try flexing or vibrating
the board for possible intermittents. Can also try powering up the unit
while holding the send key, or other keys in hopes it does a system reset,
in case something got corrupted. Sometimes there is a battery too that is
soldered in and can cause loss of cpu operations.


wrote in message
ups.com...
|I need a service manual or at least schematic for the main board
| of a Toshiba 3450 Fax machine.
|
| Not available from Tritronics, Herman's, or Vance-Baldwin -
| apparently Faxes are made by a different division of Toshiba than
| their A/V stuff. The model was not listed on any of the on-line fax
| parts dealers I tried. Calling Toshiba directly, I just got the
| runaround, just being told to call different numbers - no one
| actually said they didn't have the manual - just didn't have a clue
| as to how to get it. I have a collection of 8 or 9 different
| phone numbers I was passed around to over a 2 day period.
|
| Problem with the machine is it's basically dead. Thought it would
| be a simple power supply problem, ESR'd the caps in the PS, found
| an open 0.33 uF electrolytic, replaced with three 0.1s. Machine
| still dead, but have +5, +/-12, and +24 volts from PS. One output
| is relay switched, and never turns on. I don't know if there
| should be any additional output voltages from the PS. Have clocks
| and data activity on the uP (Z8002), but nothing on LCD except a
| faint row of blocks on the top line of the display, no other signs
| of life.
|
| Mike
| WB2ME
|