Manley СORE REFERENCE CHANNEL STRIP - MCORE001-025 4/2014 - 5/2014 - Manual (Page 12)

VR15 VR12 VR16
GR-METER LIM CV LIM REF V OP1 ZERO VU
Diagram 8
14. Servicing
VR11 VR9 VR6
GR-ZERO
12AX7WA 6922
GR-AUDIO
TUBE LOCATION
CALIBRATION TRIM POT LOCATION
c o r e
The CORE requires calibration for 3 sections of its circuitry:
I) - VU METER- Adjust: +4dBu (1.228 Volts RMS) = “0” VU, Meter “GR” zero set
® ii) - ELOP COMPRESSOR- Adjust: Gain Reduction (Audio & Meter GR)
iii)- FET PEAK LIMITER- Adjust: reference voltage & FET control voltage
Tools required:
- Audio Tone Generator (oscillator)
- Audio Analyzer or a voltmeter capable of reading both DC & AC voltages.
Initial settings:
- Mic/Line Input select switch: Out = LINE IN Enable
- 120Hz HP filter switch: Out = Disable
- Gain switch: Out = LOW
- 48V Phantom switch: Out = OFF
- Phase Invert switch: Out = 0
- Input Level Attenuator: Set at Minimum
- Compressor Section: Switch = Bypass; Compression, Attack & Release =12:00 O'clock
- Shelving EQ section: High/Low controls set both = 12:00 O'clock.
- Mid EQ section: Boost/Cut control = 12:00 o'clock, Frequency range select switch = 100Hz-1kHz,
Frequency sweep control = MIN
- Peak Limiter section: Limiting = MIN, Release = 12:00 o'clock
- Output Gain Control: 12:00 o'clock
15. Core Calibration Procedure
2A (T) FUSE
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