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INSTRUCTION MANUAL
Preamplifier Model PAM-103
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REV012017
5.4 Battery Replacement and troubleshooting tips
The replaceable battery pack can be accessed from the bottom of the preamplifier. Four screws
secure the cover to the battery compartment. Please charge the new batteries overnight initially
to maximize operating time of the preamplifier.
5.5 Troubleshooting Common problems
Problem: Gain is low or no gain.
A: Make sure the power switch is on and the green is LED is lit.
Check if the input and output cables are connected securely. Wiggle both cables and verify if the
signal level changes on the receiver. If the signal changes replace the defective cable and check
again. Make sure the cable from the signal source is connected to the input not the output.
Verify if the signal source connected. If it is a signal generator make sure the RF is turned on.
Inject a known signal level into the preamplifier and check the gain. For example if you inject 50
dBµV, you should read ~ 81 to 83 dBµV on the receiver. Please be cautious not to exceed the
input limits given in specification table of this manual.
Make sure the battery is fully charged or the adapter is plugged into a AC power source.
Problem: Battery low indicator remains lit even after charging overnight.
A:
The battery may need to be replaced. However, before you replace the battery perform the
following steps
Make sure the battery terminals are connected to the preamplifier
Check the fuse on the back panel. If the fuse is blown, replace it. Please heed
the warning label on the bottom of the fuse holder and rear panel.
Check the charging adapter to make sure it is supplying the rated voltage on the
adapter. If the charging adapter is producing the proper voltage, the batteries
may have to be replaced. Otherwise replace the charger adapter.
