Ramsey Electronics AR2 Manual de Instruções descarregar pdf (Página 21)

ABM1 • 21

ABM1 TROUBLESHOOTING

While we had hoped that it wouldn’t come to this, if you are having trouble with

your receiver, here are a few suggestions.

By far the most common sources of problems are misplaced parts or poor

solder connections. It’s always best to take a break before searching for bad

connections. A good way of checking component placement is to double

check the assembly steps going backwards from the last steps to the first.

Bright lighting and a magnifying aid can be helpful in identifying soldering

problems.

Use a methodical, logical troubleshooting technique. Most problems can be

solved using common sense. A volt-ohm meter and a clear head are usually

all that are needed to correct any problem.

No sound from ABM1.

Check these items in the following order:

 Verify the Squelch control is fully counter-clockwise.

 Check that the Battery Clip is soldered in with the correct polarity (+)

connected to the red wire and (-) connected to the black wire.

 Check that the Battery polarity is correct. The battery’s (+) terminal

connects to the smaller tab.

 Is your Battery Good? New does not necessarily mean good. Check for

9 Volts without the battery connected to the ABM1. If possible place a

1k ohm resistor across the battery contacts during the test. This places

a load on the battery which gives a better indication of the battery’s

condition than open load testing:

 Connect battery to the ABM1 and switch on the unit, verify the

battery still has an output of approximately 9 Volts.

 If not, turn off the unit and look for solder bridges and

components improperly installed. Verify the polarity and

orientation of all IC chips, transistors, and electrolytic capacitors.

 If it has 9 volts, check the AM Detector, Audio Amp, and Squelch

circuits carefully for solder bridges, and proper component

placement.

 Verify pin 1 of U2 is less than 0.2 Volts DC, if not see: “Squelch Circuit

Not Functioning”.

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Ramsey Electronics AR2 Manual de Instruções Página 21