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POWER SUPPLY 1/5
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The power supply circuits for 2005 year of RX-D... series are similar. One main
difference is the 'D+5V_HDMI' is not in models RX-D201/202/301/302.
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There are two AC power transformers in the unit.
1. T101 for standby power: supplies D+5V and B+5V_Mi DC power for CPU IC501
and RY+9V (power ON/OFF relay circuit).
2. T102 for unit operation after power on: There are more than 15 different DC
voltages provided for unit operation after power is turned on.
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The DC voltages: +B, AMP+B, AMP-B+12V and DCDC_-B+12V all vary (along
with output volume) referenced to ground. The '–B' voltage is -50v~ -62v
referenced to ground. The label 'DCDC_-B+12V' DC voltage means this is the
DC voltage supply to the DCDC converter circuit, the +12 DC refers to –B; if
referenced to ground, it is -38v~-50v.
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The +B and AMP+B voltages are higher in models RX-D402/702, because the
output power is higher than RX-D201/202.
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The +2.5v, DCDC_+12V, DCDC_-B+12V, AMP-B+12V, D+5V_DSP and
D+5V_HDMI are not produced in the main PCB.
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You could check all of the voltages at the indicated (underlined) locations
without any extension cable, before or after power is turned on. (See the next
page)
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Some additional DC voltages are produced in 'Regulate PCB' and 'Master clock
PCB'.
note
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