Heathkit IM-4180 - Page 6

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Page 9) as you perform the following steps.
(1) Connect the battery case and (or) Battery
Charger/Eliminator Accessory a i
the “Initial Tests” on Page 41.
( Vv Set the front panel controls as follows:
ON-OFF switch: OFF
BATT switch: In.
( iY On the main circuit board, connect all five
jumper wires (except the green jumper) to their
adiacent NORM connecto ni
CANA PRRNR eee LN 1ector pitt
) pointer. It should indicate one
idth (thickness) below the “0” index
of the scale. If it does not, adjust the
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the correct pointer position.
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rection for
(1,3 Connect the green wire jumper to the circuit
board 8V pin
(1) Push the ON-OFF switch to ON.
(\ va “Turn 8V ADJ control R186 with the
tri
alignment tool for a reading of exactly 7.5 on n the
0-20 scale.
(J Push the ON-OFF switch to OFF.
(é] Disconnect the green jumper wire from the 8V
pin and push it onto the 15V circuit board pin
(py Slightly push in on the TUNE switch to release
the BATT switch to its out position.
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you may us oaths of the following methods. Using
the first method, you will need a frequency counter
capable of covering from 25 MHz to 50 MHz. The
; ;
second method will require a standard FM broadcast
receiver. Proceed to the one procedure below that you
prefer.
Alignment Using Frequency Counter
(<}+ Connect the RF Input
jack on the Deviation
Meter to the input jack of a frequency counter.
(F I, Set the frequency
Deviation Meter scale.
IMPORTANT: Some frequency meters may indicate
exact multiples of 2x or the fundamental fre-
quency.
(t-) Turn the FINE TUNE control to align the
pointer with the line at approximately 2 o’clock
on the front panel.
(x “Push the ON-OFF switch to ON.
NOTE: You will be instructed to adjust coil L202 and
trimmer C211 in the following steps. Use the coil
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Gignimient tGGi ana aaj LSet L202 tor ough tne convert ter
shield hole marked “LO.” Adjust trimmer C211 with
the trimmer alignment tool through the shield hole
marked “HI.”
Adjust coil L202 and trimmer C211 as follows:
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(Disconnect the frequency counter from the
ees
Deviation Meter.
Proceed to ‘““Main Circuit Board Calibration.”