AUSTRALIAN MONITOR AMIS250 Series, Руководство по обслуживанию

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7 Priority check
7.2 Plug microphone into input 1 and oscillator to input 3. Check for muting of channel 3.
7.3 Plug microphone into input 2. Check for muting of channel 3.
7.4 Check ‘Mute Disable’ function. Insert Disable / Enable link (Factory set – ENABLE).
8
Check 4 tone switched inputs. Set output level of tones to approx. 14Vrms (+ 2V) using Evac tone.
Make sure channel 3 – 6 mutes with any of the tone’s.
9
Check telephone input sensitivity for CH2
Tel input =180 mV output =70V (
±
5V).
10
Increase the signal such that you get 76V & you can see the overload protection coming on with a kink
visible on the sine wave if it is there then reduce the voltage to 35V out and then short output. Release the
shorting and check for the return of output waveform
11 Remove input signal and check for Hum & Noise (<20mVrms).
12
Reset volumes to minimum.
THERMAL CHECK
13
Connect load to the amplifier apply signal such that you get 42Vat out put. Set for thermal shut off at
110°C (+ 5
°
C)
LISTENING TEST
Requirements for Listening Test Setup :
a. CD Player
b. Speaker
c. Microphone
14 Connect amplifier to the program source and speaker
14.2 Set all input pots at minimum and all tone pots to the centre (12 o’clock) position and check for turn
on thump
14.3 Check CD Player (AUX) inputs each channel and tone controls for each channel
14.4 Check Priority functions: CH 1 over CH 3 – CH 6, CH 2 over CH 3 – CH 6.
14.5 Check that all generated (alert, evacuation) tones function