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SERIES 306 TROUBLESHOOTING GUIDE
306 PRINTER
SERVICE GUIDE
The following information is intended to aid service personnel
to develop good service procedures and troubleshooting techniques in
servicing Centronics Model 306 printer_
When servicing the printer for any reason, a brier inspection
and verification of the printer areas described below may well prevent
potential failures in the future_
To perform this inspection, first remove the printer covers.
Then, with printer power turned off, check the following areas:
1. Verify that the timing fence is clear and that a proper gap
exists between the optics and the timing fence.
2. Verify that the carriage guide bar is clean and free of
caked-on dirt.
3. Verify proper main drive belt tension.
4. Verify smooth. free carriage motion.
5. Check damper operation. Verify that there is no binding and
that the piston O-ring is intact and lightly greased.
6. Check that the RTP and EOP switches are not loose.
7. Check that the line feed O-ring and pulleys are clean and do
not slip.
8. Verify uniform clutch gap.
9. Verify proper pin alignment on pin-feed tractor units.
10. Verify proper pin feed belt tension.
11. Verify proper backstop pawl spring tension.
12. Verify smooth line feed clutch operation.
Turn power on:
If optional Vertical Format Unit is used, check VFU paper
tape position over the light holes to insure proper detection
of vertical tab and form feed signals.
~RI~
MALFUNCTION
MODEL
306
SVHPTIl1
PROIABlE
CAUSE
•
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fBI
~~'O~TAL~~~_·
_ _ _ _ _ _ _ _ _ :
~
I"E,,"ITTEST - "mAL
HEAD HOV(S BUT
~10 PRISTI~/POOR
REGISTRATION OR [RRATIC PRINT
MISSING DOTS, POOR OR INTERMITI[NT REGISTRATION All CHARACTERS
MISSWG OR [J:TRA DOTS. CERTAIN CHARACTERS ONLY
L
I~jES
ACROSS PAGE
CARRIAGE I"OV[MEIH ERRATIC
CARRIAGE STICKS OR BINDS
CARRIAGE Jl()vES FORWARD aUT OOES NOT RETURN
CLUTCH ON
CLUTCH OFF
CARRIAGE DOES NOT MOvE FORWARD
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~CA~RR~IA~G~E~DO~ES~N~O~T~RE~ru~R~N~AL~L~TM~E~~~Y~T~O~L~E"~
_____________
~
NO RIBBON FEED
D-1
~ __ ~~E~RAA~T~IC~MO~VE~HE~NT~~~~~~ __________________
fiEID
SCRDLLlNG OR FDLDING
•
TOO SLACK
b
~FO~,,"~S~R~UNr~~AY~~~~
________________________
~~
PAPER TIME OUT
PAPER RUNS CONTINUOUSLY
PAPER SKEW OR JAM
He
FO,," FEEO
~ER~AA~T~IC~L~IN~E:S:PA:CI:NG~
__________________________
~
~NO~L~I~NE~F~EE~O;;~~
_________________________
:~
~~~LT~I;PL~E~LI~N~E~FE~EO~~
________________________
~~
~IN~TE~RH~I~n~EN~T~O~PE~AA~TI~ON~
_________________________
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