III-10
4.
LOW-VOLTAGE POWER SUPPLY ASSY
4.1 Outline
The low-voltage power supply assy consists of the low-voltage generating block
(hereinafter the DC block) and the heater drive circuit block to turn the heater on
(hereinafter the AC block).
When the power switch (SW1) is turned on, AC power is supplied to the low-voltage
power supply assy.
The DC block gen5 VDC, and +24 VDC.
When the heater is turned on, AC power is supplied to the AC block under control of the
heater on-off signal from the engine controller.
+24V output is reserved in the DC block, for the cooling fan for the low-voltage power
supply assy.
4.2 Protection
Functions
Each of the power supply circuits, +5V, and +24V, has a protection function to prevent
the circuit from accident by automatically cutting off the power supply in the case of a
over-voltage or over-current of the load.
When the cooling fan stops to rotating, an over-voltage protection or a short-circuit
protection function is activated, and all the DC power supplies are cutoff.
In this case check and clear the cause on the load after turning the power switch (SW1)
off, and then switch the power on again at least one minute after the power shut-down.
Summary of Contents for HL-2060
Page 1: ...MECHANICS ELECTRONICS SERVICE MANUAL LASER PRINTER ...
Page 41: ...III 8 A B F C D E 1 E 2 E 3 E 4 E 5 F Figure 3 7 Paper Feed Size SW PCB Circuit ...
Page 129: ...VII 16 Test for memory MEMORY DISPLAY MEMORY DEBUG MEMORY TEST exit MENU ...
Page 137: ...Appendix A 3 Main PCB Circuitry Diagram 1 7 CODE UK4058000 B512006 CIR 1 7 NAME A 3 ...
Page 138: ...Appendix A 4 Main PCB Circuitry Diagram 2 7 CODE UK4058000 B512006 CIR 2 7 NAME A 4 ...
Page 139: ...Appendix A 5 Main PCB Circuitry Diagram 3 7 CODE UK4058000 B512006 CIR 3 7 NAME A 5 ...
Page 140: ...Appendix A 6 Main PCB Circuitry Diagram 4 7 CODE UK4058000 B512006 CIR 4 7 NAME A 6 ...
Page 141: ...Appendix A 7 Main PCB Circuitry Diagram 5 7 CODE UK4058000 B512006 CIR 5 7 NAME A 7 ...
Page 142: ...Appendix A 8 Main PCB Circuitry Diagram 6 7 CODE UK4058000 B512006 CIR 6 7 NAME A 8 ...
Page 143: ...Appendix A 9 Main PCB Circuitry Diagram 7 7 CODE UK4058000 B512006 CIR 7 7 NAME A 9 ...
Page 144: ...Appendix A 10 Control Panel PCB Circuitry Diagram 1 1 CODE UK4077000 B512005 CIR NAME A 10 ...
Page 145: ...Appendix A 11 Laser LD PCB Circuitry Diagram 1 1 CODE UK3253000 B48K253 CIR NAME A 11 ...
Page 147: ...June 98 54T046NE0 HL2060 ...