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.
