Teledyne 4220 - Manual (Page 144)

4220 Flow Meter
Section 6 Maintenance and Service
6-10
7. Locate the three small pins on each spool of the ink ribbon
and turn the spools so the pins face the gears on the two
ribbon shafts.
8. Replace the two spools on their respective shafts, pushing
the detector levers out of the way so the spools will easily
re-engage their gears.
9. Gently rotate each spool to tighten the ink ribbon. Rein-
stall the paper take-up roll if necessary.
6.4.3 Do Not Disassemble or
Lubricate the Printer
You do not need to oil the printer mechanism. As long as you
keep the lid closed, keep the inside of the cabinet clean, and do
not abuse the printer in any way, it should function normally.
Teledyne Isco recommends you make no attempt to oil or disas-
semble the mechanism if it malfunctions.
Oil attracts dirt; some oils can become gummy over time and may
cause parts to bind or stick. Do not attempt to disassemble the
printer mechanism, as you may bend or distort the frame or com-
ponent parts. This will certainly cause malfunction.
Do not force any part of the mechanism with tools or probes. If
you disassemble the flow meter, do not lift the chassis from the
case by holding on to any part of the printer. The internal printer
contains no user-serviceable parts other than the paper and the
ribbon. If the printer needs service, Teledyne Isco recommends
you return the flow meter to the factory.
6.5 Servicing And
Troubleshooting
The remainder of this section provides servicing information and
a general troubleshooting guide. This information will help you
decide whether to attempt to repair the flow meter yourself or
return it to the factory.
Included are sections on removing the flow meter chassis and
fuse replacement. There are also general comments on servicing
electronic equipment with special consideration of CMOS cir-
cuitry.
6.5.1 Disassembling the
Flow Meter
You can remove the flow meter chassis from the cabinet for
inspection and servicing. Unscrew the four screws, two at the
top, and two at the bottom, that hold the flow meter chassis in
the cabinet. You can then lift the chassis out by inserting the
thumb or index finger from each hand into the upper right and
lower left corners of the opening for the internal printer.
Do not try to lift the flow meter out of its case by holding
on to any part of the printer mechanism. This could bend or
distort part of the printer, possibly damaging it. Once the chassis
has cleared the case, you can hold onto the edges with both hands
and lift it free of the case.