Technical Reference; Power Supply Circuit Change - Canon BJC-55 Service Manual
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- User manual (468 pages) ,
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6. TECHNICAL REFERENCE
6-1. 5V Power Supply Circuit Change
The signal lines for obtaining head information (HRANK signal, ID0 signal, ID1 signal,
HCONT signal, and HDIS signal) are common with the power resource "Vcc1" for the
Logic Board IC of the BJC-50/50v. The Vcc4 power resource circuit has newly been
added as a 5V power resource of the BJC-55/BJ M40 for the signal lines for obtaining
head information.
The Vcc4 is the sequence which goes ON periodically, and only at soft-power-on. As a
result, the load to the print head caused by applied voltage has been reduced.
Power Source
+5V DC
V2-ON
V3-ON
V4-OFF
Newly-assigned circuit
<5V/3V Power Creation Circuit Block Diagram>
Vcc4
HRANK
ID0
ID1
HCONT
Amplifier
HDIS
Circuit
<Head Interface (Changed Part)>
Vcc1 (+5VDC)
3Vcc (+3.3VDC)
Vcc2 (+5VDC)
Vcc3 (+5VDC)
Vcc4 (+5VDC):
For obtaining head information
Vcc4
Vcc4
Vcc4
14
:MPU, EEPROM, DRAM
Printer Controller
Motor Driver
Control ROM
: USB Interface
: BJ cartridge
(Logical power source)
: Sensors
CNH1
TOP
21
ID0
19
ID1
18
IHKS2
17
20
DIA
DIK
1
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