P-5 (bizhub 4750i/4050i)

Please search Knowledge Base articles and Bulletins as they may contain relevant information and updated Part information such as Part numbers.

Contents

Malfunction type	IDC sensor failure
Malfunction code	P-5
Malfunction detection timing	– During IDC sensor light intensity correction, IDC sensor output is uncompleted. – During IDC base surface detective control, sensor output voltage detected is under 0.7 V or over 3.35 V. – During image stabilization (gamma correction control), detected output value for IDC sensor did not go below threshold (half the value of what is detected by IDC sensor on the belt surface) for three consecutive times (position of the pattern end is not detected).
Relevant parts	-Transfer belt unit -IDC sensor (IDCS1) -High voltage unit (HVPS) -Base board (BASEB)

Procedure

1. Wipe clean the surface of the transfer belt with a soft cloth, if it is dirty.
2. Replace the transfer belt unit if the transfer belt is damaged. (Part# ACT9R70300)
3. Reinstall or reconnect IDCS1, connectors connecting between IDCS1-relay CN70-BASEB CN22E, if any of the foregoing parts is installed or connected improperly.
4. Clean IDCS1, if it is dirty.
5. Check the connector between HVPS CN1-BASEB CN4E for proper connection.
6. Open/close the front door, run an image stabilization sequence, and select [Service Mode] -> [State Confirmation] -> [Level History 1] to check the IDC value.
   IDC1: IDCS1
   If the value is 1.0 V or less, replace IDCS1. (Part# A161M50000)
7. Replace BASEB.
   4750i (Part# ACT9H02013)
   4050i (Part# ACT9H02002)

(Link to the Field Service Manual)