GE Vivid E9, Service Manual

Page: 277 / 802

GE H
EALTHCARE
D
IRECTION
GA091568, R
EVISION
5 VIVID E9 S
ERVICE
M
ANUAL
Chapter 5 - Components and functions (theory) 5 - 87
5-10-4-3 Forced Power Down
NOTE: In case of total lockup of the system, hold the ON/OFF button down a few seconds to turn the
system off.
Forced Power Down is initiated by depressing the ON/OFF button on the keyboard for a few seconds,
until the power down sequence starts:
1.) BEP detects long-term 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.
5-10-4-4 Power Loss
A power loss may be due to:
• The Mains Switch has been switched to OFF
• The Mains cable has been disconnected
• Brown-out or power loss (burnout)
If a power loss (or error) occur, all power distribution within the unit is lost.
NOTE: This shut down sequence will typically be less than 1 second from the power failure is detected
to all voltages have been shut down.