Panasonic JS-170FR Series Service Manual

Contents

2-472.1.17 Power ON/OFF circuit2.1.17.1 Power ONThe conditions to make power ON are categorized to the following three cases:The conditions and conditional sequences are specified below.(Condition 1..... ON with the primary-side switch. Condition.......JP9 is short-circuited.)• The primary-side Power switch is turned ON.• A power supply of +5VSB is supplied.• The AC_ON_SB signal is turned to the high level.• Potential at Pin 8 of HCT74 (IC48) is turned low.• Since JP9 is short-circuited, the PS_ON# signal is turned to the low level.• The secondary side output of the power supply is turned ON.(Condition 2..... ON with the secondary-side power switch. Condition.......Standby state with the primary side turned ON.)• The primary-side Power switch is turned ON and the standby state is assumed. (AC_ON_SB at high level)• The secondary-side Power switch is turned ON and the PWR_SW# signal is turned low.• Potential at Pin 3 of MB3771 (IC47) is turned high and the PS_ON# signal is turned low.• The secondary side output of the power supply is turned ON.(Condition 3..... ON through the LAN. Condition.......Standby state with the primary side turned ON.)• The primary-side Power switch is turned ON and the standby state is assumed. (AC_ON_SB at high level)• The command for Power ON is output through the LAN and the LAN_WAKEUP signal is turned high.• Potential at Pin 6 of HTC74 (IC37) is turned low and the PS_ON# signal is turned low.• The secondary side output of the power supply is turned ON.

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Panasonic JS-170FR Series Service Manual

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