7. TEST PROCEDURE
1. Instruments:
1). AP (Audio Precision)
2). Dual oscillograph
3). Voltmeter
4). USB line
2. Instruments Setting:
1). AP output: 0dBu 1KHz SINE waveform, Load out 40
ȍ
Bal-Gnd or Load out 20
ȍ
Unbal-Gnd.
2). AP input: Load 100K
ȍ
BNC-Float or Load 100K
ȍ
XLR-Bal BW: 22Hz~22KHz.
Fltr: A-Weighting (1207).
3. Visual Check:
Check the surface of AMX-220FX and be sure it is OK; the potentiometer knob has no
frication.
4. Functional Test:
1). After the surface checking is OK, input proper AC power voltage, open the POWER
switch and the PWR led will light up. Then open the PHANTOM switch, the PH led will
light, the second and third pin of MIC1~8 input socket has 48V voltage which has been
tested by voltmeter, and close this switch (note: this switch should be closed for the
following test, or the instruments will be damaged).
2). Set the MAIN MIX LEVEL, PHONES/CONTORL ROOM, EQ, PAN, BAL knob to 0, the
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Summary of Contents for AMX 220FX-USB
Page 1: ...MODEL AMX 220FX USB...
Page 16: ...6 PCB LAYOUT 14...
Page 32: ...8 EXPLODED VIEW PARTS LIST 30...
