[Menu]>[Electronic circuit beans collection]>[PLL synthesizing oscillator (2)]
| Tools which are necessary to adjust
Procedure of the adjustment
(Because the IC breaks when there is a mistake in the wiring, it is for the safety).
Confirm sufficiently about whether there is not a solder-bridge (contacting the terminal or the wiring in the neighborhood with solder) because the wiring is small.
As for the parts such as the capacitors, the diodes, the transistors which have the polarity, confirm whether or not the mounting is right.
Make the circuit tester the voltage measurement mode and connect the negative lead line with the grounding and measure the following voltages with the positive lead line. In all voltage measurement after this, the negative reed connects with the grounding.
When the +5 V line voltage isn't over, because to short-circuit is thought of, switch off the power supply at once.
Don't attache or remove the ICs as it turned on the power.The ICs have broken.
If mount of the ICs ends, turn on the power again.
It is OK if 10.24 MHz are over as the reference frequency.
When not working normally
When 10.24 MHz aren't output, the crystal oscillation circuit must be confirmed.
Confirm solder-bridge, solder-loose (solder isn't stuck right) by the watching because the crystal oscillation circuit is only the wiring.
When the BCD input opens, it is the same as the L condition.
"L" shows 0 V and "H" shows +5 V.
Connect the frequency counter with OUT1 and confirm that the 133.300-MHz frequency is over to OUT1.
When the normal output doesn't come out, it adjusts L1.
Connect +5 V with the dividing ratio input terminal in order which is shown below and confirm that the frequency changes.
Adjust for the output voltage to become the highest.
In case of OUT1, adjust L2 and in case of OUT2, adjust L3 respectively.
The adjustment ended above.