Harman Kardon AVR 4550, Руководство по обслуживанию

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2. BACK SURROUND B'D
: 5 Min. After power on, please set up Bias as below,
SBL > use VR31 then set P301 as 23mV +2mv/-1mV.
Center > use VR41 make P401 to 23mV +2mV/-1mV.
SBR > use VR51 then make P501 to 25mV +2mV/-1mV.
P301 VR31 BACK SURROUND L-CH P401 VR41 CENTER-CH