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HP laserjet m712 Fehlerbehebungsanleitung

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Low-voltage power-supply PCA
The low-voltage power supply converts AC power into the DC voltage that product components use.
Figure 1-6
  Low-voltage power-supply PCA
+3.3VA
+3.3VA
+3.3VA
+3.3VA
+3.3VA
+3.3VB
+3.3VB
+5V
+3.3VC
+3.3VD
Rectifying
circuit
Zerocross
detection
circuit
High-voltage
circuit
Fuser circuit
+24VB
/PSTYP100
+24VB
+24VC
+24VC
+24VD
/ZEROX
RMT_24V
RMT_PFC
Low-voltage power supply
Power switch
AC input
+24V
generation
circuit
DC controller
Power fuse
FU1
+3.3V
generation
circuit
Protection
circuit
Formatter
High-voltage power supply
+5V
Interlock
switch
SW2
Connector PCA
Power fuse
FU2
Power fuse
FU3
+5V
generation
circuit
Interlock
switch
SW1
The following table shows the specifications for the DC power supply.
Table 1-4
  Low voltage power supply DC power specifications
DC voltage
Behavior
+24V
+24VB
Off during Sleep mode (sleep level1, active off and inactive off)
+24VC
Off during Sleep mode (sleep level1, active off and inactive off) Interrupted when the left door open
+24VD
Off during Sleep mode (sleep level1, active off and inactive off) Interrupted when the left door or
the cartridge door open
10
Chapter 1   Theory of operation
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