Tektronix Phaser 840, Service Manual

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Service Guide 119
Lubrication
In general, all of the printer's bearings and motors are lifetime factory-lubricated.
However, over time and under certain extreme operating conditions, oil and
grease may dry out, causing squeaks and rumbling noises in the printer. Look for
fine metal particles — a clear sign of an old or worn bearing. Replace the bearing
or the assembly it is a part of.
A drop of grease on a noisy bushing will quiet a noisy printer. Too much
lubrication can get into the paper path and attract dust, so apply lubrication
sparingly.
Lubricate the following only when needed:
■ Bushings: Apply a drop of light oil to a bushing if it is noisy or running
dry.
■
Plastic gear train: This gear train from the process motor to the
paper-feed module requires only a small amount of white grease for
noise-reduction purposes. Apply grease sparingly so that it does not
fling off of the gears when they turn. You need only to apply a dab of
grease to a single gear and the grease will migrate throughout the entire
gear train. Do not apply oil to gears; only use approved grease.
Note Do not apply lubricant to the head tilt gear or the head tilt gear guide.
■
X-axis drive. Apply a small amount of grease on the tip of the nose
cone. Apply a small amount, 3 dabs, on the threads of the X-axis shaft.
■ White (nylon) plastic bearings: No lubrication required.
■ Transfix cam: If lubrication is needed, apply a very small dab of grease
to the two contact points between the cam and the latch and the cam
and the cam advanced spring. CAUTION : Excess grease can fall onto
the drum belts causing them to slip; replace the belts and clean the
drum gear with alcohol. Never clean belts with alcohol, it damages
them
Tools and supplies required
■
Light oil
■
Grease 006-7997-00
Lubricating the transfix cam
0388-75
Add small dab
of grease, if
needed