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Service Guide ML520/521
Chapter 2 Principles of Operation
2.1.08 Power Supply Circuit
The switching type power supply circuit supplies the +5 vdc,
Voltage/Signal | Purpose |
+5 vdc | IC logic levels, LED drive voltages |
+8 vdc | Serial interface line voltage, comparator IC |
+10 VAC | Serial interface line voltage and the printhead analog circuit |
+40 vdc | Printhead, space motor and line feed motor drive voltage |
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