DPP-M55 (serv.man2) - Sony Other Service Manuals Service Manual (repair manual). Page 11

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When assembling the mechanism deck, lift up the paper guide slightly, and assemble so that it goes inside the mechanism

deck.

If the paper guide is not inside the mechanism deck, paper printed in the manual mode will be ejected from the auto

feeder insertion slit.

Black grease is applied at the contact point between the left and right head arm assemblies and the power gear.
When this grease runs out, symptoms may appear such as the wearing of the head arm assembly, drop in head pressure

which causes printing to become light, and mechanical noise of metal parts, etc.

Apply grease if the customer used frequently.

Clean the pinch roller with ethyl alcohol when it becomes dirty. As it turns black with use, replace it if the print surface

of the print paper becomes black.

If paper chips are adhered to the capstan roller, remove with adhesive tape, etc.