Canon PS-7000 Service Manual page 30

Short Circuit Troubleshooting
Start of Short Circuit
Troubleshooting
Remove the LED Panel Board Cable,
and measure the resistance at C2 on the
Main Board. *1
Correct?
No
Take out the HDD, and measure the
resistance at C2 on the Main Board.
*1
Correct?
No
Remove the Font SIMM, and
measure the resistance at C2 on the
Main Board. *1
Correct?
No
Remove the DRAM SIMM, and
measure the resistance at C2 on the
Main Board one by one. *1
Correct?
No
B
*1: The correct resistance at C2 is 40 to 50-ohm.
*2: Measure the resistance between VCC (12 pin) and GND (5 pin). The correct resistance is 1M-ohm or more.
Yes
Measure the VCC-GND resistance at
the connector of the LED Panel
Board. *2
Correct?
No
Replace the LED Panel Board.
Yes
Replace the HDD cable.
Yes
Replace the Font SIMM.
Yes
Replace the DRAM SIMM.
3-7
Chapter 3 Troubleshooting
VCC GND
1 2 C N 1 1
Connector of the LED Panel Board
Yes
Replace the LED Panel Board Cable.
*JP model only
(Japanese font SIMM)
To Start of Troubleshooting.