doble TDR9000, User Manual, Page: 354 / 454

Power Supply
B-26 72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
If the meter registers:
• More than 800 kOhms, the fuse is blown, proceed to step 4.
• Less than 800 kOhms, the fuse is not blown, replace the Power
Supply circuit board assembly. Refer to ”Power Supply”
on page B-26.
4. Pull the blown fuse out and insert a new fuse.
Replacement fuses are 5 x 20mm and 250 VAC. The:
• 5V supply fuse is 3.15A, Littlefuse #216 3.15 or equivalent
• 24V supply fuse is 4A, Littlefuse #216 004 or equivalent
5. Plug the unit in and power up the TDR9000.
6. Check the LED on the System module Physical Front Panel.
If LED is not green, refer to the Troubleshooting Flow Charts starting
on page B-11.
7. Replace the top cover and reinstall the two rubber feet.
Power Supply
If the Physical Front Panel LED does not illuminate and the fuses located
on the Power Supply circuit board are not blown, the DC power supply is
suspect and should be replaced. The power supply is called out in
Figure B.11 on page B-15.
To replace the power supply:
1. Turn the TDR9000 power off and unplug.
2. Remove the top cover, as shown in Figure B.15 on page B-20.
3. Unscrew the captive fasteners on the circuit board.
4. Disconnect the two connectors and the green ground connector
indicated in Figure B.18.