DPP-EX5 - Sony Other Service Manuals Service Manual (repair manual). Page 38

4-8

DPP-EX5 V1

Trouble:

The ribbon is wound round the capstan roller and cannot be taken out. (Ribbon jamming)

Cause:

. Abnormal ribbon cassette
. Abnormal installation position of ribbon guide
. Abnormal chassis assembly (Deterioration in take-up reel clutch torque or ribbon path

abnormality due to chassis deformation)

Remedy:

. Remove the mechanical deck block from the lower cabinet, turn the gear engaged with the

stepping motor gear, and eliminate the ribbon.

. Confirm that the ribbon guide is fixed in clockwise direction with the heat sink and in the

non-floating state.

(If the ribbon guide is not fixed in the conditions above)
Loosen the fixing screw and fix the ribbon guide again.

. Replace the chassis assembly if it is abnormal.

Trouble:

. Paper is not fed from the paper feed tray.
. Abnormality is detected at equal pitch intervals in the paper feed direction of the printed

side.

n
An abnormal point can be confirmed according to the interval of a pitch.
. Pitch interval of 18.8 mm: Pinch roller abnormality
. Pitch interval of 20.4 mm: Capstan roller abnormality
. Pitch interval of 37.7 mm: Platen roller abnormality

Cause:

. Adhesion of dust or grease
. Adhesion defect (in case of a pinch roller and platen roller)
. Welding defect (in case of a capstan roller)

Remedy:

. Remove the mechanical deck block from the lower cabinet and clean each roller. (For the

dust adhering to the capstan roller, eliminate it using a gum tape.)

Trouble:

A stripe is detected in the paper feed direction of the printed side.

Cause:

. Adhension of foreign objects to the thermal head surface
. Broken thermal head
. Flaw and scar on ribbon guide
. Flaw and burr on the printed side of paper path of K (paper feed) frame assembly

Remedy:

Clean the paper feed path using the cleaning kit supplied with this unit.  When the trouble
persists even after cleaning, replace other faulty parts that may cause the trouble.