Protective Functions; Power Protective Function - Canon LBP3010 Series Service Manual

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Service manual (146 pages)

Table Of Contents

Table of Contents

Noise filter

Protection

circuit

2.6.1.2 Protective Functions

2.6.1.2.1 Power protective function

LBP3100 / LBP3010B

Low voltage power circuit carries the overcurrent preventive function against and overvoltage preventive function that block the voltage output automatically to

prevent the power circuit brokerage when the overcurrent or overvoltage occur due to load errors such as short circuit etc.

Thus, when the DC power cannot be output from the low voltage circuit, the protective function against overcurrent or overvoltage may be working. Turn OFF the

power switch (SW1) to fix load errors and turn ON the switch again (see note 1).

Also the circuit carries the 2 fuses (FU101, FU102) as a preventive function (see note 2). The fuses blow to block the power supply when overcurrent occurs in AC

line.

1. When restoring the low voltage power after protective function is activated, leave it for 2 minutes or more from turning off the switch or plugging out before turning

ON.

FU101

Noise filter

FU201

(110-127V model only)

Frequency detection circuit

(220-240V model only)

+24V

generation circuit

+24V

output switch circuit

+5V