Troubleshooting Guide - Ramsey Electronics AA7B User Manual

or random wire with earth ground or counterpoise, a vertical whip of
some kind, a Slinky, or even a pair of alligator clips at the end of your
coax line, ready to be clipped to any large metal surface that may be
handy, from screen doors to bed springs! This accessory for your AA7B
will help you explore the truth of "Ramsey's Antenna Rule" in a variety of
situations: "If you want more signal, put up more metal!"
A Caution to Ham, Maritime and CB Operators:
If you are using the AA7B to boost reception on a transceiver of any kind,
rather than only a receiver or scanner, make sure it is not possible to
transmit by accidentally pressing a mike button or CW keyer. Transmitted RF
into the AA7B will damage the unit.

TROUBLESHOOTING GUIDE

95% of all kits returned for repair are assembly errors. If you are having
problems with you kit please recheck all of your work for: proper component
values, component orientation, poor solder joints, solder bridges, etc...
No Power, no gain, LED not lit:
1. Verify the correct output voltage of the external supply or battery
being used.
2. Verify the output lead of VR1 is at 5 volts DC. If it is not check the input
lead of VR1for supplied voltage. If input lead is good check installation
of VR1.
3. Check U2 pin 2 for 5 Volts with the switch in the on position (pressed). If
no 5 volts is present check installation of S1 and U2.
LED Not lit, have gain:
1. Check D1 and R11 for proper installation.
No Gain or signal bypass mode, LED lit:
1. Check voltage at U2 pin 3 for 5 VDC with S1off. Also check U2 pin 6 for
0 VDC with S1 off. If these voltages are not correct check U2 for proper
Installation.
2. Check U1 and U5 pin 4 for 5 VDC with S1 off and pin 6 of those IC's for
0 VDC. If these voltages are not correct then look over U1 and U5 very
carefully and see if you notice anything unusual. Since these are pre-
installed factory parts and under warranty call Ramsey Electronics for
advice on how to proceed. If you attempt to repair these devices and
damage them without contacting Ramsey Technical support you may
void your warranty.
No Gain, Good bypass mode, LED Lit.
1. Check U1 and U5 pin 4 for 0 VDC with S1 on and pin 6 of those IC's
for 5VDC. If these voltages are not correct then look over U1 and U5
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