Alto AMX-80 Service Manual Download Page 13

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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Summary of Contents for AMX-80

Page 1: ......

Page 2: ...CONTENT 1 INTRODUCTION 1 2 TECHNICAL SPECIFICATION 2 3 BLOCK DIAGRAM 3 4 SCHEMATIC DIAGRAM 4 5 WIRING DIAGRAM 6 6 PCB LAYOUT 7 7 TEST PROCEDURE 9 8 EXPLODED VIEW MECHANICAL PARTS LIST 11 9 BOM 13...

Page 3: ...amic range Balanced inputs for highest signal interity Warm natural 2 Band EQ on mono channel Warm natural 2 Band EQ on mono channel Balanced TRS and Headphone Outputs 2 track inputs assignable to mai...

Page 4: ...2 TECHNICAL SPECIFICATION X X X X 2...

Page 5: ...3 BLOCK DIAGRAM 3...

Page 6: ...4 SCHEMATIC DIAGRAM 4...

Page 7: ...5...

Page 8: ...5...

Page 9: ...5 WIRING DIAGRAM 6...

Page 10: ...HB02128 AMX 80 TOP LAYER TOP OVERLAY 6 PCB LAYOUT 7...

Page 11: ...HB02128 AMX 80 BOTTOM LAYER BOTTOM OVERLAY 8...

Page 12: ...X LEVEL to maximum the output LEVEL should be 15dBu 3dBu THD N 0 008 After test set MAIN MIX LEVEL back to middle position and CH LEVEL to minimum 4 Set AP input to 0dBu connecting unbalanced input wi...

Page 13: ...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...

Page 14: ...minimum all the other knobs to middle position and all the switches to off position Test Complete 5 Frequency Response test With unbalance input connecting LINE IN of the AMX 80 set the high EQ knob...

Page 15: ...8 EXPLODED VIEW MECHANICAL PARTS LIST 12...

Page 16: ...12...

Page 17: ...001 NI00014 membrane 0 035 1M 1 0002 NH00012 bond paper 0 04 1M 1 0022 NE02717 label MADE IN CHINA 2 0001 NH00038 paper 0 115 1M 1 0002 NI00028 membrane 0 110 1M 1 0023 TG00212 adaptor RS 230V 50Hz_AC...

Page 18: ...6 ND00155 EV foam 25 20 5 1 0027 AC00179 tin without lead RS M705E Sn 3Ag 0 5Cu 9 5148 0028 HK07193 PC board RS P AMX 80 SMD 1 0001 SE00011 SMD rectifier diode RLS4148 0 5A LL 34 8 D1 D2 D3 D4 D5 D6 D...

Page 19: ...89 0033 RD00210 SMD precise resistor 1 10W 5 11K 1 0603 6 R10 R11 R13 R16 R114 R115 0034 RD00211 SMD precise resistor 1 10W 5 49K 1 0603 2 R112 R113 0035 RD00510 SMD precise resistor 1 10W 6 20K 1 060...

Page 20: ...ated circuit RS 4580M SOP8 YW 12 U1 U2 U3 U4 U5 U6 U7 U 8 U9 U10 U11 U12 0029 CB00255 electrolytic capacitor 1000uF 10V 8 11mm 5mm 1 C11 0030 SD00238 integrated circuit MC78L18ACP TO92 ON 1 IC3 0033 H...

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