HP 8550 Service Manual - Page 526
No +24 VAR printer
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No +24 VAR (printer) Cause Step Printer dc power 1 Connectors 2 Right cover 3 switch (main relay PCB) Black toner 4 cartridge switch Toner cartridge 5 cover switch (SW6772) Drum cartridge 6 switch Main relay PCB 7 Checks Yes/No Action Disconnect the power plug of the YES printer from copy module and connect it directly to the power outlet. Is the printer now receiving dc power? See "No dc power in the printer (+5V, +24 VB)" on page 522 Are connectors J701 to the NO developing rotary motor PCB; connectors J641, J642, J644 and J648 on the main relay PCB; connector J672 on the sub-relay PCB; and connector J102 of the power supply all connected securely? Connect the connectors securely Is there electrical continuity NO between connectors J641-1 (+24 VB) and J642-3 (PMP) on the main relay PCB when the black toner cartridge switch (SW644) is turned on? Replace the right cover switch on the main relay PCB. Is there electrical continuity NO between connectors J644-1 (PBK) and J644-2 (PMP) on the main relay PCB when the black toner cartridge detection switch (SW644) is turned on? Replace the black toner cartridge (SW644). Is there electrical continuity NO between connectors J642-1 (PYMC) and J642-2 (PBK) on the sub-relay PCB when the toner cartridge cover switch (SW762) is turned on? Replace the toner cartridge cover switch (SW762) on the sub-relay PCB. Is there electrical continuity NO between connectors J642-1 (PYMC) and J648-1 (+24 VAR) on the main relay PCB when the drum cartridge switch (SW642) is turned on? Replace the drum cartridge switch (SW642) on the main relay PCB. Disconnect the power plug of the NO printer from copy module and connect it directly to the power YES outlet. Turn on the printer power switch (see note on page 521) and measure the voltage between the connectors J648-1 (+24 VAR) and J648-3 (GND) on the main relay PCB. Is it 24 V? Replace the main relay PCB. Replace the dc controller PCB. 524 Chapter 7 - Troubleshooting EN