HP 8550 Service Manual - Page 502
E040 printer, controller PCB has generated the holding plate solenoid SL4
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E040 (printer) The holding plat lifter (multi-feeder) is faulty. This error occurs during multi-feeder pick-up, when the holding plate position sensor (PS1302) does not detect the holding plate even when the dc controller PCB has generated the holding plate solenoid (SL4) ON signal. Cause Connectors Step 1 Multi-feeder tray 2 PCF +24 UH 3 Holding plate 4 solenoid Checks Y/N Are connector J213 on the dc NO controller PCB; connectors J641, J642, J643, and J647 on the printer side main relay PCB; connectors J671 and J672 on the sub-relay PCB; connector J1302 of the holding plate solenoid; and connector J102 of the power supply connected securely? Does the voltage between YES connectors J1301-2 (+24 UH) and J1301-1 (GND) on the multi- feeder tray PCB change from 0 to 24 V? Is +24 UH present on the multi- NO feeder tray PCB and the holding plate solenoid? Disconnect connector J1302 of NO the holding plate solenoid from the multi-feeder tray PCB. Measure YES the resistance between connectors J1302-1 (MPTSLD) and J1302-2 (+24 UH) on the harness side. Is it about 160Ω? Action Connect the connectors securely. Replace the multi-feeder tray PCB. See "No +24 UH (printer)" on page 523. Replace the holding plate solenoid. Replace the dc controller PCB. 500 Chapter 7 - Troubleshooting EN