When replacing the PCDU of the SP C842DN, release spring pressure according to the following procedure.
- This is necessary because the SP C842DN requires a different spring pressure compared to the SP C840DN. Failing to carry out this procedure will reduce the yield of the PCDU to about 1/10 of its target and will also degrade the cleaning performance, resulting in an image quality problem where black streaks appear on the printout.
Releasing the spring pressure
- Remove the seal [A].
Insert a flat-headed screwdriver into the hooked end of the pin, as shown. Move the screwdriver and pin slowly over to the opposite side, which will disengage the spring. Remove the screwdriver slowly from the pin.
Make sure to use a flat-headed screwdriver, as the spring is under very high tension. DO NOT do this step by hand.
- If the pin is attached crookedly to the unit causing the hook to face outward, do not insert the flat-headed screwdriver as shown in the 'Incorrect' illustration. The screwdriver will slip out from the hook and may cause damage to the components. If the pin is distorted, correct the pin and insert the screwdriver as shown in the 'Correct' illustration.
- If the pin is attached crookedly to the unit causing the hook to face outward, do not insert the flat-headed screwdriver as shown in the 'Incorrect' illustration. The screwdriver will slip out from the hook and may cause damage to the components. If the pin is distorted, correct the pin and insert the screwdriver as shown in the 'Correct' illustration.
- Check if the spring pressure is adjusted correctly.
Correct
Incorrect
If incorrect, open the cover and reattach the spring. See Attaching the Spring after Mistakenly Releasing the Spring Pressure. Attach the seal [A] included with the unit.
Attach the seal in the correct orientation. If attached in the incorrect orientation, the seal may peel off.