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Back Panel:
The rear panel of the M-7700 has two jacks, a rocker switch, and two access holes for adjustments.
The DC Coax jack accepts a 2.5 x 5.5mm coaxial DC power cable, 12V, 250mA, center positive.
External power is only required if use of the internal backlight is desired. The meter functions correctly
otherwise without it.
The jack marked “Radio” accepts an 1/8” stereo plug, the other end of which plugs into the meter
jack on the IC-7700. If desired, a standard headphone extension cable may be used to place the M-7700
farther from the radio.
The rocker switch is used to turn the internal backlight on and off. It may be desirable to turn off the
internal backlight when attempting to conserve battery power.
The brightness of the backlight may be adjusted with a small flat blade screwdriver. Carefully insert
the screwdriver into the hole labeled “Brightness”, and gently turn the potentiometer left or right until
the desired brightness is achieved.
The full-scale reading may be adjusted by turning the potentiometer marked “FS” on the rear of the
meter. See the section on Calibration for details.
