Alto AMX-80, Service Manual, Page: 13 / 20

Set the PHONES to maximum, the output level should be+10dBu (±3dBu), THD+N<0.006%.
( After test set the knob to central position and CH LEVEL to minimum. )
7). Set AP input to 0dBu, connecting unbalanced input at LINE IN2/3~ LINE IN4/5, and the
unbalanced output to PHONES, the output level should be 0dBu(±3dBu) THD+N<0.01%.
Rotate the CH LEVEL to maximum, output level should be +15dBu (±3dBu),
THD+N<0.006%.( After test set the knob to central position )
Set the MAIN MIX LEVEL to maximum, the output level should be+15dBu (±3dBu),
THD+N<0.01%.( After test set the knob to central position)
Set the PHONES to maximum, the output level should be+10dBu (±3dBu), THD+N<0.006%.
( After test set the knob to central position and CH LEVEL to minimum. )
8). Set AP input to +15dBu, connecting unbalanced input at LINE IN1, and the unbalanced output
to TAPE OUT, the output level should be 0dBu(±3dBu) THD+N<0.005%.
Rotate the CH LEVEL to maximum, output level should be +15dBu (±3dBu),
THD+N<0.005%.( After test set the knob to central position )
Set the MAIN MIX LEVEL to maximum, the output level should be+15dBu (±3dBu),
THD+N<0.008%.
( After test set the knob to central position and CH LEVEL to minimum. )
9). Set AP input to 0dBu, connecting unbalanced input at LINE IN2/3~ LINE IN4/5, and the
unbalanced output to TAPE OUT, the output level should be 0dBu(±3dBu) THD+N<0.005%.
Rotate the CH LEVEL to maximum, output level should be +15dBu (±3dBu),
THD+N<0.005%.( After test set the knob to central position )
Set the MAIN MIX LEVEL to maximum, the output level should be+15dBu (±3dBu),
THD+N<0.008%.
( After test set the knob to central position and CH LEVEL to minimum. )
10). Set AP input to 0dBu, connecting unbalanced input to TAPE IN and the unbalanced output to
MAIN OUTPUT, then press the TAPE TO MIX key ,the output level should be 0dBu(±3dBu)
THD+N<0.005%.
Set the MAIN MIX LEVEL to maximum, the output level should be+15dBu (±3dBu),
THD+N<0.009%. ( After test repeat press the key once )
11). Set AP input to 0dBu, connecting unbalanced input to TAPE IN and the unbalanced output to
TAPE OUT, then press the TAPE TO MIX key ,the output level should be 0dBu(±3dBu)
THD+N<0.005%.
Set the MAIN MIX LEVEL to maximum, the output level should be+15dBu (±3dBu),
THD+N<0.009%. ( After test repeat press the key once )
12). Set AP input to 0dBu, connecting unbalanced input to TAPE IN and the unbalanced output to
PHONES, then press the TAPE TO PHONES key ,the output level should be 0dBu(±3dBu)
THD+N<0.005%.
Set the PHONES control to maximum, the output level should be 10dBu (±3dBu),
THD+N<0.009%. ( After test repeat press the key once )
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