AUSTRALIAN MONITOR AMIS120XL Series, Service Manual

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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 output.
11 Remove input signal and check for Hum & Noise (<20mVrms).
12
Reset volumes to minimum.
13
Disconnect from test bench and inspect for scratches on external paint.
14
Check the thermal cut off. It should be between (95 – 105 C). Allowable up to 115C. (If the sets show
thermal trip above 115 then charge (R49) to 3K9 or so).
14a Factory setting of links :
a. VOX Muting : Enable
b. VCA Con : Disable
c. VOX Relay : Enable
LISTENING TEST
Requirements for Listening Test Setup :
a. A CD Player
b. Speaker
c. Microphone
15
Connect amplifier to the signal source and the speaker
15.1
Set all tone pots at center position, switch on the amplifier and check for any turn on thump.
15.2 Connect the CD Player to an Auxiliary input (channel 4)
15.3 Set all Channel Pots at the minimum (fully counter clockwise) position.
15.4 Increase the level on the channel that has the program source connected and listen for audible
problems.
15.5
Check Priority function: CH 1 over CH 3 & 4, CH 2 over CH 3 & 4 by connecting a Microphone to
Channel 1. An audio signal presented to the microphone should cause the CD player to mute
Check generated tones. With a jump wire, short one of the tone connections to the tone common connector
(rear panel) and check to ensure that the tone selected activates