Mechanism Troubleshooting - Sony UP-D2550S Service Manual

6-2. MECHANISM TROUBLESHOOTING

The three main troubles of the printer mechanism deck are as follows.
1. Paper feed troubles such as miss-feeding, double-feeding, etc.
2. Paper ejection troubles such as jamming which occur after printing
3. Printing troubles from printing results
The following describes how to first locate the area with the troubles and how to solve the troubles
smoothly.
1. Paper feed troubles
Location : Paper supply block assembly
Chuck trouble occurs because the paper has not reached the platen. The possible causes are
the paper can not be fed properly due to the wear of the paper feed rubber or the platen
could not chuck the paper due to damage of parts.
If paper is double-fed, check the torque limiter and separating roller.
If the top part of the paper is badly scratched (scratches caused by the mechanism are
allowed to a certain extent), check the roller as the paper feed load may have become
lighter.
Location : Paper supply tray assembly
The paper cannot be fed even though the paper feed block assembly and paper supply lever
are working normally.
This is because the paper is not being fed from the paper supply tray.
The possible causes are the deformation of the claw of the paper supply tray or the paper is
bent when the paper is set to the tray.
2. Paper ejection trouble
Location : Platen cover assembly
After completing printing, paper ejection is carried out, but the paper is not ejected. Paper is
jammed at the top of the platen.
This paper ejection trouble is caused by the damage of paper holding parts of the platen
cover (upper cover which can be opened and closed for reparing paper jamming).
Location : Paper supply block assembly
Paper jams near the paper ejection exit and not on top of the platen.
This may occur when the paper ejection flap attached to the paper feed block assembly
drops or when the support portion is damaged.
UP-D2550S (UC,CE) 6-3