Final Testing And Calibration - Ramsey Electronics FM-100 Assembly And Instruction Manual

P. FINAL TESTING AND CALIBRATION
We're almost ready to plug it in. We will need the following equipment to give
it a true test.
A DMM or voltmeter.
A sound source such as a CD player or tape deck.
A microphone with the appropriate jack.
A receiver (preferably digital tuner).
The tuning tool sent with your kit.
1P. Adjust R15, R23 and R35 to their center positions.
2P. Make sure the power switch is off. Plug in your FM-100 to 110 volts.
3P. Turn on the FM-100. All of the digits of the display should light, the
speaker will beep, and then go to some frequency.
4P. The FREQ LOCK light may or may not light. We will get to that later.
5P. Press both frequency buttons at the same time. You should get a
confirming tone and the 10's decimal point should blink indicating setup
mode.
6P. Press FREQ UP until the display shows 107.9 MHz if it does not
already.
7P. Connect your voltmeter between the exposed part of R11 and ground.
Adjust L1 with your tuning tool until you see about 4.8 volts present.
8P. Step FREQ UP to get to 88.1MHz and check the voltage on R11 for
about 0.3 volts
9P. At this point the FREQ LOCK LED should be lit continuously.
10P. Now is a time to choose a frequency. Consult the "Choosing a
Frequency" section of the manual for this.
11P. When you have set your frequency, press both FREQ keys. You
should hear three short beeps to confirm the data has been written.
12P. Turn off the power, wait ten seconds and turn it back on. Verify that
the unit comes up to the correct frequency and that the FREQ LOCK LED
lights.
13P. Tune your receiver to the same channel you have chosen. Verify that
there is a signal present and that the stereo light on the tuner is on.
FM-100 Page 46