Power On/Off Circuit; 2.1.17.1 Power On - Panasonic JS-170FR Series Service Manual

2.1.17

Power ON/OFF circuit

2.1.17.1 Power ON

The 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.
• 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.
• 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.
• 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.
Condition .......JP9 is short-circuited.)
Condition .......Standby state with the primary side turned ON.)
Condition .......Standby state with the primary side turned ON.)
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