Reset the bass pot to centre. Set the frequency to 10kHz. Set the treble pot to max
(CW).
(P/F) The output reading shall be between 42VAC-50VAC.
Set the treble pot to min (CCW).
(P/F) The output reading shall be between 4VAC-6VAC.
[Setup for next test] Reset the treble pot to centre. Reset Ch4 pot to max (CW).
Move signal in to Ch1 RCA.
9.
Phase
Setup
Signal generator = 0.5VAC, 1kHz
Signal in = Ch1 RCA
All channel pots = max (CW)
Bass/Treble = centre
Master pot = max (CW)
Output metering = 100Vout
Load = 40ohm
Procedure
Attach channel 2 of the CRO to the input. Make sure the CRO is being triggered by
the input. Look at each output on channel 1 of the CRO. The CRO ground should be
connected to the common both for the low impedance outputs and the line outputs.
(P/F) The signals on the CRO shall be in phase for all outputs (100V, 4ohm).
10.
Priority check
Setup
Signal generator = 0.5VAC, 1kHz
Signal in = Ch4 RCA
Ch pots = max (CW)
Bass/Treble = centre
Master pot = max (CW)
Output metering = 100Vout
Load = 40ohm
Procedure
Plug a microphone into input 1 and oscillator to input 4. Turn channel 1 pot to min
(CCW). Speak into the microphone.
(P/F) The output shall drop in level to < 10VAC.
Stop speaking and disconnect mic.
(P/F) The output shall return to /-10VAC in <10sec (Mental count is
acceptable).
Speak into the microphone. The output shall drop in level to < 10VAC. Keep
speaking. Set the Disable/Enable link to disable.
(P/F) The output shall return to /-10VAC in <10sec (Mental count is
acceptable) while you are still speaking.
Insert Disable/Enable link to ENABLE.
[Setup for next test] Set master to min (CCW). Set ch1 to max.