AMU2-2MA AUDIO MONITORING UNIT - TSL
AMU2-2MA AUDIO MONITORING UNIT - TSL
AMU2-2MA AUDIO MONITORING UNIT - TSL
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6.1 Initial Set-Up<br />
Connect 1khz Tone @ 0dB to Analogue I/P 1 L & R.<br />
Set front panel switches to Analogue I/P 1, check for audio presence indication on<br />
front panel LEDs and deflection on both meters.<br />
6.2 Audio Alignment AMP-2<br />
The board is set for unity gain.<br />
Place the AMP-2 PCB on an extender card.<br />
PR1 is set for the LH A1 channel 0dB O/P probe pins C10/C11- balanced.<br />
PR2 is set for the RH A2 channel 0dB O/P probe pins C12/C13 – balanced.<br />
PR5 is set for 0db for the fixed A3 channel probe pins C14/C15 – balanced.<br />
PR6 is set for 0dB for the fixed A4 channel probe pins C16/C17 – balanced.<br />
PR3 is set for 0dB for the S signal probe pin C1.<br />
PR4 is set for 0dB for the M signal probe pin C1.<br />
PR7 is the LH PPM drive output and is set for 0dB probe pin C24.<br />
PR8 is the RH PPM drive signal and is set for 0dB probe pin C25.<br />
6.3 PPM Calibration Procedure<br />
Alignment ACB Card<br />
VR1 sets the +12dB point for the LH PPM Meter<br />
VR2 sets the +12dB point for the RH PPM meter<br />
VR4 sets the –12dB point for the LH PPM Meter<br />
VR5 sets the –12dB point for the RH PPM Meter<br />
Repeat the process for accurate tracking<br />
6.4 VU Calibration Procedure<br />
The drives for the VU meters are taken from the AMP-2 card pins<br />
C24 and C25, left and right respectively<br />
With 0dBu or desired reference signal injected into the Analogue 1 I/P, adjust the<br />
variable resistor on the meter PCB for -4 VU. (0VU = +4dBu).<br />
6.5 Bargraph Calibration Procedure<br />
The drives for the RTW bargraph meters are taken from the AMP-2 card pins<br />
C24 and C25, left and right respectively<br />
<strong>AMU2</strong>-<strong>2MA</strong> MKIII 17 ISSUE 1