Aeroflex 3500A - Page 158

3-6 Subject to Export Control, see Cover Page for details.
TROUBLESHOOTING TABLE (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6 Blows Fuse
Step 1. Connect the External DC Power Supply to a verifiable AC Power Source
and verify the LED is lit.

If incorrect, replace the External DC Power Supply.
Step 2. Using a DMM on the External DC Power Supply output, verify +18 Vdc
(±1 Vdc).

If incorrect, replace the External DC Power Supply.
Step 3. Replace the Fuse (para 3-3-3).

If the Fuse continues to blow, refer to Troubleshooting (para 2-2) in
the 3500 / 3500A Maintenance Manual.
7 Battery does not charge
Step 1. Connect the External DC Power Supply to the 3500 / 3500A and verify the
CHARGE Indicator is Green or Yellow.

If incorrect, replace the Battery (para 3-3-2).
Step 2. Allow four hours for Battery to fully charge and verify the CHARGE
Indicator is Green.

If incorrect, replace the Battery (para 3-3-2).
8 Display is blank or abnormality exists in Display
Step 1. Press the POWER Key.
Step 2. Check and/or adjust Contrast and Backlight levels.
Refer to Troubleshooting (para 2-2) in the 3500 / 3500A Maintenance
Manual.
9 Display Contrast or Backlight cannot be adjusted
Refer to Troubleshooting (para 2-2) in the 3500 / 3500A Maintenance
Manual.
10 Keys inoperable
Refer to Troubleshooting (para 2-2) in the 3500 / 3500A Maintenance
Manual.
11 Self Test failure
Refer to Troubleshooting (para 2-2) in the 3500 / 3500A Maintenance
Manual.
12 Connector failure
Inspect connector for damage and/or wear.
Refer to Troubleshooting (para 2-2) in the 3500 / 3500A Maintenance
Manual.