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Tip
Ring
Sleeve
Connect speakers to T1. As you look at the back of the unit the left most
contact of T1 is Left (+), the second contact is Left (-), the third contact is
Right (+), and the right most contact is Right (-). Make sure to match these
polarities to your speakers. DO NOT for any reason short the speak wires. If
you are going to use your UAM4SYS in single channel mono mode, connect
the output lines together on the circuit board at the locations provided near T1.
Instructions are provided both on the circuit board and in this manual. It is
recommended that all testing be done in stereo mode so if a problem exists it
is easier to identify.
Set the bass, treble and balance to midrange, volume control fully counter
clockwise and the power switch S1 to off (out position).
TESTING
If any of the following steps fail to produce the indicated result please refer to
the troubleshooting section of this manual.
Power Supply
Note in the following steps all VOLTAGE measurements are take with the
RED or "+" lead of the voltmeter connected to the indicated test point. The
BLACK lead or the terminal labeled "-" or "common" of the voltmeter is
connected to the outside (ground) bracket on J8.
MAIN POWER INPUT (12VDC to 18VDC)
With the power switch, S1, turned off connect the power supply to J5.
Turn on or plug in the power supply and measure the voltage at the
connection on the back of J5, (that's the terminal on the back of the
connector itself on the top of the board). [READING = +12 to +18VDC
depending on the power supply]
10 VOLT SUPPLY
Measure the voltage on pin 4 of U1. [Reading = +10VDC +/- 0.2VDC]
5 VOLT SUPPLY
Measure the voltage on pin 1 of U10. [Reading = +5VDC +/- 0.2VDC]
Unbalanced
Signal
Ground/No Conn.
Ground
Balanced
Positive
Negative
Ground
UAM4SYS • 26
Stereo
Left
Right
Ground
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