Read Sony DPP-M55 (serv.man2) Service Manual online
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(4) Motor Control
• Head up/down motor (M902)
Motor which moves the head up and down.
There are three head positions-”Initial”, “Paper Pull In”, and “Print”.
There are three head positions-”Initial”, “Paper Pull In”, and “Print”.
• PLATEN motor (M904)
Stepping motor which moves the print paper front and back. Motor rotation consists of two speeds. (Printing:Slow, Paper
forward/reverse:Fast)
Speed is switched by switching Q902 according to the STPLOW signal (Pin *¡ of IC505) from the mechanism microprocessor.
Motor rotation is controlled by the STEP PH1 to PH4 outputs from the system controller (IC503).
Motor rotation is controlled by the STEP PH1 to PH4 outputs from the system controller (IC503).
• Ribbon motor (M903)
Motor which rewinds the print cartridge.
• Fan motor (M901)
Motor which rotates the FAN and lowers the head temperature.
The voltage of the thermistor at the side of the head is input to the system controller (Pin (º of IC503), the head temperature
The voltage of the thermistor at the side of the head is input to the system controller (Pin (º of IC503), the head temperature
is detected, and data is serial-transferred to the mechanism controller (IC505).
When the head temperature is high, the motor driver rotates the FAN motor using the output from the mechanism
controller. When the thermal head temperature decreases, the FAN motor stops.
Attach the FAN motor facing the direction in which it can suck in air from outside.
(5) Detection Switches
(i)
DPP-M55
(a)
Head position
•
Head position sensor 0, 1
Detects three head positions.
Detects three head positions.
(b)
Presence of print cartridge
•
Ribbon door sensor
Detects half-insertion of the print cartridge.
Detects half-insertion of the print cartridge.
•
Ribbon cord sensors 1, 2
Detects the presence of the print cartridge.
Detects the presence of the print cartridge.
(c)
Type of print cartridge
•
Ribbon cord sensors 0, 1, 2
(d)
Print paper
•
Paper edge sensor
Detects the insertion and position of the paper during printing.
Detects the insertion and position of the paper during printing.
•
Jamming detection sensor
Detects paper jamming. Detects the length of the print paper together with the paper edge sensor.
Detects paper jamming. Detects the length of the print paper together with the paper edge sensor.
(e)
Print cartridge color position
•
Ribbon mark sensor 1
Detects the long black line at the top of the print cartridge, and detects the starting position for one image.
Detects the long black line at the top of the print cartridge, and detects the starting position for one image.
•
Ribbon mark sensor 0
Detects the short black line of the print cartridge, and detects the border between colors.
Detects the short black line of the print cartridge, and detects the border between colors.
(ii)
Auto feeder
(a)
Feeder position
•
Feeder position sensors 0, 1
Detects the up plate position and lock lever position.
Detects the up plate position and lock lever position.
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