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.
Содержание HL-2060
Страница 1: ...MECHANICS ELECTRONICS SERVICE MANUAL LASER PRINTER ...
Страница 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 ...
Страница 129: ...VII 16 Test for memory MEMORY DISPLAY MEMORY DEBUG MEMORY TEST exit MENU ...
Страница 136: ...Appendix A 2 Paper Feed Size SW PCB Circuitry Diagram 1 1 CODE UK4067000 B512011 012 CIR NAME A 2 ...
Страница 137: ...Appendix A 3 Main PCB Circuitry Diagram 1 7 CODE UK4058000 B512006 CIR 1 7 NAME A 3 ...
Страница 138: ...Appendix A 4 Main PCB Circuitry Diagram 2 7 CODE UK4058000 B512006 CIR 2 7 NAME A 4 ...
Страница 139: ...Appendix A 5 Main PCB Circuitry Diagram 3 7 CODE UK4058000 B512006 CIR 3 7 NAME A 5 ...
Страница 140: ...Appendix A 6 Main PCB Circuitry Diagram 4 7 CODE UK4058000 B512006 CIR 4 7 NAME A 6 ...
Страница 141: ...Appendix A 7 Main PCB Circuitry Diagram 5 7 CODE UK4058000 B512006 CIR 5 7 NAME A 7 ...
Страница 142: ...Appendix A 8 Main PCB Circuitry Diagram 6 7 CODE UK4058000 B512006 CIR 6 7 NAME A 8 ...
Страница 143: ...Appendix A 9 Main PCB Circuitry Diagram 7 7 CODE UK4058000 B512006 CIR 7 7 NAME A 9 ...
Страница 144: ...Appendix A 10 Control Panel PCB Circuitry Diagram 1 1 CODE UK4077000 B512005 CIR NAME A 10 ...
Страница 145: ...Appendix A 11 Laser LD PCB Circuitry Diagram 1 1 CODE UK3253000 B48K253 CIR NAME A 11 ...
Страница 147: ...June 98 54T046NE0 HL2060 ...