Read Sony DPP-M55 (serv.man2) Service Manual online
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3. Disassembly
(1) Thermal head
The thermal head has high durability and does not require replacement in normal use. There is also no need for worry of
contamination.
When the head is faulty, symptoms can be seen such as a line forming in the printing direction or printing may not be
possible at all.
If printing of mixed colors or printing of dust-like dots are seen, it means that the print cartridge is dusty or the print
paper is dirty. Rewind the print cartridge used and check if it is normal.
(i)
Head arm fixing screw...Important!
The head arm fixing screw is adjusted appropriately at factory shipment, therefore never rotate it. (Refer to “Replacing
the Head” in the service manual for its location.)
(ii) Silicon compound
Silicon compound is applied between the thermal head and heat sink. When replacing the head, make sure it does not get
onto the other parts.
If the silicon compound gets onto the side of the print cartridge of the head, clean off with alcohol.
(2) Assembling the head up/down unit
Assemble with the head raised.
However, rotating the head drive gear excessively will move it to an unlikely position in the usual mechanism operations.
However, rotating the head drive gear excessively will move it to an unlikely position in the usual mechanism operations.
If this occurs, the head will not move to the appropriate position when the power is turned on, and the mechanism
operations will be faulty.
operations will be faulty.
To avoid this, assemble so that the pin of the power gear is at the top. (See Fig. 4)
Fig. 4 Pin Position of Power Gear (L)
(3) Assembling the motor gear
The head drive gears (R) and (L) need to be phase-adjusted.
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