Ricoh C211 Service Manual page 642

5. Image Trouble
c Phenomenon>
5-5. The image density is too low on the operation side. Confirm with facsimile thermal
paper.
< Possible causes>
1. Parallel adjustment of the thermal head
[A] is faulty. A strip of master paper can
be drawn evenly from the right side to the
left side if the pressure (clearance)
between the thermal head [A] and the
platen roller [B] is even.
2. The fixing screws [D] of the platen
roller are loose.
3. The platen roller is slightly deformed.
<Countermeasure >
1. Insert a screw driver into the hole on the
operation side of the main body and
loosen the fixing screw [C] of the plotter
unit. Adjust the thermal head so that it is
parallel with the platen roller [B]. (830)
2. Tighten the fixing screws [D]. After this
instruct the customer to ensure that
these fixing screws do not become loose.
3. Replace the platen roller.
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