Ramsey Electronics AR2 Manual de instrucciones descargar pdf (Pagina 22)

ABM1 • 22

No Signals can be heard

 Check MAR-1SM (U1):

 Check the input pin for 2.5 Volts DC +/- 10 %. This is the pin with

the dot.

 Check the output pin for 4.7 Volts DC +/- 10 %. This is the pin

across from the dot.

 Check the 1

Band-pass Filter, 2

Band-pass Filter and the AM

Detector circuits for solder bridges, misplaced components,

polarity of components, and orientation of components.

 Check U2’s supply Voltage at U1 pin 6 or 7; it should be 4.3 Volts DC +/-

20 %

Erratic Operation:

 Check all solder connections for a complete, shiny solder joint.

Squelch Circuit Not Functioning.

 Check U3 for the following Voltages (all voltages +/- 10 %):

 Pin 2, varies between 0.2 Volts and 2 Volts DC with input signal

strength.

 Pin 3, voltage should be 0.08 VDC with R7 fully counter-

clockwise, 1.0 VDC with R7 fully clockwise.

 Pin 8, equals the Battery Voltage (approximately 9 Volts).

 Pin 4, 0 Volts DC

 Pin 1, 0 Volts DC with R7 fully counter-clockwise, 9 Volts with R7

fully clockwise.

If all else fails, check the inside back cover of this manual for instructions on

how to send the kit in for repair. Hopefully you’ll never get to that point but it’s

nice to know that there’s someone out there to help you if you do.

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Ramsey Electronics AR2 Manual de instrucciones Pagina 22