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