Printer Service Tips; Reset Signal Line Checkout; Print Emitter Timing Using Mol; Forms Emitter Timing Scope Procedure - IBM 5100 Maintenance Information Manual

PRINTEft SERVICE TIPS
Reset Signal Line Checkout
A 'reset' signal line that is not functioning pl'OJ)erly will
not always cause printer failures. Consequently, there is
no particular symptom associated with this problem. If
you suspect that the 'rl!!sef signal line is not functioning
properly. use the fbllowing J)rocedure to check out the
'reset' signal in the printer:
1.
Power down the
5100.
2.
Do not power down the printer.
3. Probe B1-84, 812 (-Reset).
4. Power up the 5100.
5. Check that the probe DOWN light is ori.
6. Press the HOLD key. Press the CMD key and the
+
key to copy the display.
7. Check that the probe UP light is on.
B. Power down the printer.
9.
Check that the probe DOWN light is on.
~rint
Emitter Timing Using MOl 805
If you are doing left margin adjustments, run MOl 805.
This MOl checks the timing of the left margin. You can
also loop on step to theck for intermittent errors. If you
do the print emitter pickup adjustment 340, do the left
margin adjustment 343 and run MOl 800 to verify the
adjustments.
3-106
Forms Emitter Timing Scope Procedure
1. Remove the forms tractor unit and the paper.
2.
Move the copy control dial to eliminate printing on
the . platen.
3.
Load printer diagnostic MOl
BOO.
Loop on the
step number that indicates quick forms movement
test
(PT01V5).
4. Place the scope lead On U07 on the printer
adapter card (forms emitter A). Display one pulse
on the screen.
Good: Adjust until display looks like this:
Bad:
__ -..o!J
Bad:
u
n
1..
1
--~"----
Forms Jams
The following items can cause forms jams and incorrect
forms movement:
There is incorrect pressure plate clearance on the
forms tractor.
The paper deflector is too close to the platen.
The cut form guide on the left rear top cover is
not flipped back or it is used with continuous
forms.
The paper path is incorrect. See the BASIC or
APL reference manuals for correct forms feed
paths.
Forms are being used that are thicker than
specified. The maximum forms thickness allowed
is 0.018 inch (4.572 mm). See the Form Design
Reference Guide, GA24-348B.
The ribbon shield might be too close to the platen.
The forms tractor unit is not parallel with the
platen and is not fully seated at all four mounting
points.
All the pressure rolls do not contact the platen
evenly.
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