MFJ-941EK Tuner Kit Instruction Manual
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CONSTRUCTION
Key Assembly Instructions:
Key words are used to shorten the length of the assembly steps to one line. Find
means to pull specific items from the parts inventory for installation. Identify
means to look for a mark or feature that orients the part for installation. Install
means to clean leads, insert them at a specified location, and bend or wrap them
so the part stays in place. Solder means to apply solder, inspect the connection,
and nip off protruding leads or pins. Legend refers to silk-screen lettering on the
printed circuit board.
Circuit Board Assembly:
Find the circuit board and take a minute to survey the component-side legend for
various part locations. When you're ready to begin construction, find the five
resistors listed below:
(2) 100 ohm (brown, black, brown)
(1) 150 ohm (brown, green, brown)
(1) 3.3K (orange, orange, red)
(1) 47K (yellow, violet, orange)
[ ] Install a 150 ohm 1/2-Watt resistor at R1 and solder.
[ ] Install a 3.3K resistor at R2 and solder.
[ ] Install a 100 ohm resistor at R3 and solder.
[ ] Install a 100 ohm resistor at R4 and solder.
[ ] Install a 47K resistor at R9 and solder.
Next, find four (4) 50K trimpots (black, 3/8" OD, 3 pins)
[ ] Install 50K at R5 and solder.
[ ] Install 50K at R6 and solder.
[ ] Install 50K at R7 and solder.
[ ] Install 50K at R8 and solder.
Find the four (4) disc ceramic capacitors listed below. Note that three leftover .01
uF capacitors will be installed later.
(1) 33pF (33)
(1) 220pF (221)
(2) .01 uF (103)
[ ] Install 33 pF at C3 and solder.
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