EA3GCY ILER-20 MK2, Assembly Manual

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ILER-20 MK2 SSB QRP Transceiver Kit Page 32
If you don't have access to instrumentation, speak or whistle into microphone and adjust P2 so that you
obtain the maximum power level of power on the power meter. P2 should be adjusted just to the point at
which maximum power is obtained or a little less.
This adjustment will be a little ambiguous, since it depends a lot on the operator's type of voice and way
of speaking. Use the “cut and try” method.
It is recommended that you request a fellow operator to critique your modulation.
Note: For very sharp or very bassy voices, you may slightly readjust the BFO to obtain the best level of
output power.
IF YOUR KIT DOES NOT WORK AFTER ASSEMBLY
Don't worry, it is not uncommon that a kit doesn't work on the first try; stay calm, as in most cases they
are minor problems with a simple fix.
Most of faults are due to poorly soldered connections or misplaced components; it is very rare to find a
faulty component. Before taking any measurements with test equipment, check all the connections and
carefully inspect your soldering, looking for cold joints, short circuits between traces, sockets not making
good contact, or components mounted in the wrong place.
If your kit does not work after final assembly, please follow these steps in order:
- Double-check every step in the assembly manual, the solder connections, and correct component
placement.
- If you have access to instrumentation, take measurements and follow the signal path of the circuits to
diagnose what is happening and why.
- Request another ham experienced with kits or a radio technician to check your work. Someone taking a
fresh look may find things that you overlooked.
- If you decide that technical assistance is needed, you are welcome to send an email to
ea3gcy@gmail.com . As a last resource, you may send the kit in for repair; however, I will have to charge
for any repairs done, although I will try to keep the cost as moderate as possible.
To help troubleshoot your transceiver, the following voltage table may be useful. The IC and transistor
voltages were measured in receive
(without volume) and transmit (without modulation) . If there is a
fault, it is quite likely that one or more of the readings will be very different.
IC Ref. Type pin1 Rx pin1 Tx pin2 Rx pin2 Tx pin3 Rx pin3 Tx pin4 Rx pin4 Tx
IC1 LM741 0 0 0 6.20 0 6.55 0 0
IC2 SA602 1.26 1.26 1.26 1.26 0 0 4.95 4.95
IC3 SA602 1.40 1.40 1.40 1.40 0 0 4.80 4.80
IC4 LM386 1.34 0.42 0 0 0 0 0 0
IC5 78L06 Out.=6V -- -- -- -- -- -- --
C6 78L08 Out.=8V --- -- -- -- -- -- --
IC7 78L08 Out.=8V -- -- -- -- -- -- --
IC8 78L05 Out.=5V -- -- -- -- -- -- --