Canon imageRUNNER ADVANCE C5051 Series Service Manual page 487

Flow■F:■Connector■Disconnection■Flow
■ Status■Check ■
At■the■time■of■startup,■the■LEDs■of■Main■Controller■1■and■2■turn■ON■and■the■Main■Controller■
Fan■rotates,■but■it■stops■immediately.
● Flow■for■narrowing■down■troubles ■
Flow E:
From 12V Power Supply System Flow
Open the front door
Note:
Disable the operation of the host machine
Check whether
the 12V Power Supply starts
by disconnecting the connectors of the
Relay PCB in order
Yes
Check the destination short circuit
of the narrowed-down connectors
(harnesses and PCB)
* e.g.
If 12V starts when the DC Controller connector is disconnected
Disconnect the connector of the DC Controller PCB in order and identify the location of failure
6
Troubleshooting■>■Startup■System■Failure■Diagnosis■>■Flow■F:■Connector■Disconnection■Flow■>■Status■Check
No
Replace the 12V Power Supply
6 Troubleshooting■>■Startup■System■Failure■Diagnosis■>■Flow■F:■Connector■Disconnection■Flow■>■Status■Check
● Check■item ■
1.■If■the■problem■remains■unsolved■even■after■checking■the■short■circuit■of■the■harnesses,■
disconnect■the■following■connector■one■by■one■and■repeat■the■following■procedure■to■check■
whether■the■symptoms■change.
1-a.■Open■the■front■door.■(Disable■the■operation■of■the■host■machine)
1-b.■Check■whether■the■12V■Power■Supply■starts■by■disconnecting■the■appropriate■
connectors■of■the■Relay■PCB.
J451 SO■DCDC■PCB
J422 DC■Controller
J423 HansoDriver■PCB
J424 DrumDriver■PCB
J425 High■voltage■PCB
J426 Reader■ADF■Unit
J427 UI,■USB■Device■Port
1-c.■If■12V■Power■Supply■does■not■start■even■if■disconnecting■and■connecting■the■
connector,■replace■the■12V■Power■Supply.
2.■Check■the■destination■short■circuit■of■the■narrowed-down■connectors■(harnesses■and■PCB).
e.g.
If■12V■starts■when■the■DC■Controller■connector■is■disconnected,
disconnect■the■connector■of■the■DC■Controller■PCB■in■order■and■identify■the■problem.
F-6-33
If■the■12V■Power■Supply■starts■with■the■SO■DCDC■PCB■
(J451)■disconnected,
•■ There■may■be■some■problem■with■DC■Controller,■Hanso,■
or■DrumDrive.
•■ Cables■of■DC■Controller■(J118■and■J119-LS■Harnesses)■
may■be■trapped■or■an■Laser■Scanner■failure■may■have■
occurred.
6-33
T-6-17
6-33