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6. Remove the main/front panel circuit board assembly from the case
bottom and check the back of the main circuit board for solder bridges.
7. Reinstall the circuit boards assemble into the case bottom.
UAM4SYS SET-UP AND TESTING
REQUIRED EQUIPMENT
12 to 18 Volt Power Supply with a 2.1mm power plug (+) center pin
Headphones with a 3.5mm Stereo Phone plug
Unbalanced stereo audio source with 3.5mm Stereo Phone plug (typical
consumer audio outputs such as IPODs, portable CD players, and
computers), unbalanced stereo audio source with two mono plugs (one
left, one right), or Stereo Balanced Audio Source (professional audio) with
two 3.5mm Stereo Phone plugs (one left, one Right)
Two speakers that can handle 20 Watts each
Volt meter
Two, Alligator clip leads
10uF electrolytic capacitor
JUMPER SETTINGS
1. Set the jumpers on headers H1 (REC LEFT) and H2 (REC RIGHT). If you
wish the LINE OUT audio (jacks J1 and J8) to be the same as the input
audio, place the jumpers on both H1 and H2 so that they connect pins 1
and 2 of the headers. If you wish the LINE OUT audio to be processed
by the Tone/Volume/Balance IC then set the jumpers on headers H1 and
H2 so that pins 2 and 3. Set these jumpers to pins 1 to 2 for testing.
2. Set the MONO jumper on H3. If you wish your UAM4SYS to operate in
stereo mode place the jumper on only one pin of H3. This is just to keep
the jumper with the kit so in case you need it in the future you will have it.
For mono mode place a jumper across both pins of H3. For testing set
the unit to stereo mode.
3. Set the GAIN jumpers on H4 and H5. Use the following chart or the one
on the circuit board to set these jumpers. For testing set both jumpers to
pins 1-2.
UAM4SYS • 24
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