GE Vivid E9, Service Manual

Page: 276 / 802

GE H
EALTHCARE
D
IRECTION
GA091568, R
EVISION
5 VIVID E9 S
ERVICE
M
ANUAL
5 - 86 Section 5-10 - Power distribution
5-10-4 Power Down Sequence description
5-10-4-1 Overview
There are three possible scenarios for Power Down of the unit:
• Power Down
• Forced Power Down
• Power Loss
Each of the scenarios are described below.
5-10-4-2 Power Down
Press the ON/OFF button (for a short time)
1.) BEP detects the contact of Power (ON/OFF) switch.
2.) PSON_N goes high. This trigs the Main Power Supply to shut down the output voltages.
3.) Controller ACFAIL_N output signal goes low.
4.) Controller TS_OK output signal goes low.
5.) Controller turns OFF the TS (Transmit) voltages.
6.) Controller turns OFF the PMX (Probe MUX) voltages.
7.) Controller turns OFF vo/-15, +/-6, +11V, +24V.
8.) ACFAIL_N output signal goes high.
9.) Controller turns OFF +48V.