Alto L-6, Руководство по обслуживанию, Страница: 17 / 28

F inished product test procedure
1. Instruments
AP tester
Double trace oscillometer
Voltmeter
2. Functions test
a. Input the proper AC power supply, turn on the main power, POWER LED will be
illuminated (green). Then switch on PHANTOM power, PHANTOM LED will be
illuminated (red), use a voltmeter to test the first pin and second pin of each MIC
(MIC 1, MIC 2), the volt of phantom power should be 46V(±2V). then power off
the switch.(Note: please turn off the switch when you are doing the steps of test
procedure as follows)
b. Set all TRIM, LEVEL, EQ, AUX knobs to the position of 0, set PAN to the
position of LEFT. All buttons to the position of OFF.
c. Input the signal from balanced sockets (MIC 1 & MIC 2), input the signal from t
unbalanced sockets (LINE IN 3/4&LINE5/6),
d. Input the signal to the unbalanced AUX RENTURN sockets separately, test the
balanced output (LEFT & RIGHT) of MAIN MIX OUTPUT, which should be
5dBu (±1dB) THD + N<0.003%.
e. Insert the RCA plug to L& R of TAPE IN separately:
First, press 2TK TO MIX button, test the unbalanced outputs (LEFT&RIGHT) of
MAIN MIX OUTPUT, CONTROL ROOM and PHONE (need stereo plug for
testing) separately, which should be 0dBu(±1dB) THD + N<0.006%.the output of
TAPE OUT is 0dBu(±1dB)
Then release 2TK TO MIX button (OFF), no input from CONTROL ROOM,
when press 2TK TO CONTROL ROOM, test the output, which is 0dBu (±2dB)
THD + N<0.002%.
f. Input +15dBu 1kHz sine wave (load out 600 Ω , BNC-Unbalanced) through
LINE 1, when turn MAIN MIX LEVEL counter-clockwise to the minimize, all