Canon BJ-W3000 Service Manual page 6

Descriptions in this manual are based on the following conventions.
1. In the Basic Operation section, the roles of each function, relationships between electrical
and mechanical systems, and the timing for each part are summarized.
The mark
accompanying a signal name indicates the flow of electrical signals.
Flow charts are also used in the summary of operation.
The symbols used in the flow charts are as follows:
Start/completion
2. In the descriptions of digital circuits, "1" or "H" indicates a high voltage level, and "0" or
"L", a low voltage level. However, the actual voltage values vary depending on the circuit.
3. It is assumed that the Printed circuit board (PCB) will not be repaired by the user. There-
fore, the descriptions of the circuits on the PCB are limited to block diagrams.
4. Troubleshooting is described using procedural tables.
The procedural table is a variation of a general flow chart.
An example is shown below.
e.g. No power is supplied.
Cause
Unplugged power
source
Power source failure
Blown fuse
• If you want to know the possible causes of any specific problem (suspected parts), refer to
the "Cause" column in the table.
In the event "No power is supplied" as shown in the above table, an unplugged power
source, power source failure, blown fuse, and other causes can be considered.
indicates mechanical drive transmission. The mark
Operation
Step Check item
1 Is the power cord properly con-
nected to the receptacle on the
machine and the outlet?
2 Is the specified voltage applied to
the outlet?
3 Is the fuse on the DC power PCB
(F1) blown?
PREFACE
Decision Remedy
Result
NO
NO
YES
Jump
Remedy
Connect the power code to the
machine and outlet.
Explain to the customer that the
trouble is not attributable to the
machine.
Remove the cause of the blown
fuse and replace the DC power
PCB.
Stop
iii ii