Outline; Outline Of Troubleshooting; Location Of Connectors And Pin Arrangement; Main Controller Pcb - Canon iPF720 Service Manual

6.1 Troubleshooting

6.1.1 Outline

6.1.1.1 Outline of Troubleshooting

1. Overview
Targets of troubleshooting are classified into the troubles displayed on the LCD (i.e., warnings, errors, and service calls) and the troubles not displayed on the LCD.
Warnings and errors are displayed on the printer's LCD along with a code comprising alphanumeric characters.
2. Precautions for Troubleshooting
1) Check the environmental conditions and the media used.
2) Before starting troubleshooting, check that the connectors and cables are connected properly.
3) If you repair the printer with its external panel detached without disconnecting the AC cord from the outlet, take great care to prevent electric shock and short-
circuiting of PC boards.
4) Countermeasures to take after completion of troubleshooting are described starting with the most probable component that can cause the trouble determined by
troubleshooting. If there are two or more equally probable components, countermeasures are described starting with the component that requires the easiest repair.
After performing each countermeasure step, carry out test printing to check whether the problem has been solved. If not solved, try the next countermeasure step.
5) After completion of troubleshooting, check that all the necessary connectors and screws have been installed securely.
6) After completion of replacement or repair of a component, be sure to carry out test printing to make sure that the trouble has been solved.

6.2 Location of Connectors and Pin Arrangement

6.2.1 Main controller PCB

J1001 (USB)
Pin Number Signal name
1 VBUS
2 D-
3 D+
4 GND
J1201 (to HDD)
Pin Number Signal name
1 GND
2 TXP
3 TXN
4 GND
5 RXN
6 RXP
7 GND
J1202 (to HDD)
Pin Number Signal name
1 DASPN
2 +5V
3 GND
J1801 (to power supply PCB)
Pin Number Signal name
1 AFCONT
J3401 J3602
J1001
J1202 J1201
IN/OUT
IN
IN/OUT
IN/OUT
-
IN/OUT
-
OUT
OUT
-
IN
IN
-
IN/OUT
IN
IN
-
IN/OUT
OUT
J3601 J2501 J2601 J2503
J3202 J3201 J2502 J3301
F-6-1
T-6-1
Function
USB VBUS (+5V)
USB data (-)
USB data (+)
USB GND
T-6-2
Function
GND
Transmission Data
Transmission Data
GND
Receive Data
Receive Data
GND
T-6-3
Function
Access signal
Power supply(+5V)
GND
T-6-4
Function
Normal/power saving switch signal
J1801
J3101
J3001
J3004
J2702
J2703
J2704
J2701
J2801
Chapter 6
0013-1941
0019-6544
6-1