facit n4000 service manual?

[Jay West]

My facit N4000 reader/punch has developed a problem.

Would anyone have a service manual for this unit? I have the operators guide 
but no service manual.

When powering up the unit, about 20% of the time it comes on with "Err" in 
the display. If I turn it on and off a few times, it comes up correctly with 
"Off" in the display. Also, the test tape created in diag test #4 mostly, 
but not always, passes it's read in diag test#5.

Can anyone help with a loan of the service manual or perhaps some advice?

Regards,

Jay West