Canon imageRUNNER ADVANCE C5051 Series Service Manual page 471

Startup■System■Failure■Diagnosis
The■viewpoint■of■this■Startup■System■Failure■Diagnosis
The■goal■of■the■startup■system■failure■diagnosis■is■to■be■able■to■solve■troubles■associated■
with■a■Control■Panel■display■failure■by■performing■the■following■steps.
It■is■assumed■that■the■users■have■already■learned■the■following■items:
•■ How■to■use■a■tester
•■ Roles■of■the■All-night■Power■Supply■(3.3V)■and■Non-all-night■Power■Supply■(12V)
•■ How■to■back■up■data■(HDD■and■Main■Controller)
CAUTION:
AC■power■supply■is■always■supplied■to■the■AC■Driver■PCB.■Pay■attention■not■to■cause■
short■circuit■when■accessing■the■PCB.
■ Useful■Operations ■
The■items■of■detailed■procedure■explanation■start■with■a■description■of■the■flow■diagram.■
The■items■and■procedures■checked■in■the■flow■diagram■are■described■separately■in■a■check■
item■table.■The■flow■diagram■contains■numbers■(e.g.■(1))■corresponding■to■the■check■items■
so■that■the■readers■can■grasp■the■relevant■parts■of■the■check■item■table.
Flow
Start
Has only
the backlight gone off?
Yes
(Can you hear the operation sound
of the Hard Key?)
[Assumed failure location]
No (4) 1. Control Panel Inverter PCB
2. Control Panel Unit
(2) 3. 12V Connector of the Control Panel
(1)
4. Main Controller PCB1
Is 12V supplied to C1005 Yes
of the Control Panel CPU PCB?
[Assumed failure location]
No
(3) 1. Control Panel CPU PCB
2. Main Controller PCB1
Turn OFF the Main Power Supply Switch
3. 12V Connector of the Control Panel
(2)
4. Control Panel Unit
6
Troubleshooting■>■Startup■System■Failure■Diagnosis■>■The■viewpoint■of■this■Startup■System■Failure■Diagnosis■>■Useful■Operations
Check item list
The location of each check item
can be referenced by the
corresponding number in the flow
diagram.
6 Troubleshooting■>■Startup■System■Failure■Diagnosis■>■The■viewpoint■of■this■Startup■System■Failure■Diagnosis■>■Useful■Operations
F-6-22
6-17
6-17