Ricoh D124-17 Service Manual page 742

2. Appendix 2: Service Program Mode
4 Correcting Length
The length of paper feed to correct skew. The vertical motor rotates forward while the
roll feed motor in the roll feeder rotates in reverse.
[300 to 2000/800/100 mm]
1953 Skewed Value Indication DFU
Use these SPs to display previous readings done with the DRESS sensor during skew
correction.
1 Current Skewed Value
[0 to 10/0/0.01 %]
2 Previous Skewed Value
[0 to 20/0/0.01 %]
3 Preceding Previous Skewed Value
[0 to 20/0/0.01 %]
1955 Suction Fan Duty Correction DFU
These SP codes adjust the operation of the transport fan during paper feed. The
efficiency of roll paper feed can be affected by temperature, humidity, paper type, and
paper size. The suction of the transport fan below the perforated platen keeps the
paper flat during printing. There are three Duty phases applied to change the speed of
the motor to create more suction.
• Duty 1. When the DRESS sensor switches on, the fan motor is in Duty 1 phase
• Duty 2. After the paper has fed more than 79 mm, the motor enters the Duty 2
• Duty 3. When the leading edge of the paper reaches the cutting position, the fan
When the cutter reaches the left side of the machine after performing the cut, the cutter
return switch switches on, and reverses the cutter motor to return the cutter to its home
position on the right side of the machine, and also shifts the paper transport fan down
into Duty 2 phase.
1 Suction Fan
38
while the paper feeds up to 79 mm past the registration standby position.
Strongest suction.
phase. Strong suction.
enters Duty 3 phase. Normal suction.