GE LOGIQ E9 Service Manual page 224

GE H
EALTHCARE
D 5180263-100, R
IRECTION
5-7-4 Power Down Sequence description
5-7-4-1 Overview
There are three possible scenarios for Power Down of the LOGIQ E9:
• Power Down - normal power down (short push)
• Enforcement Power Down (long push)
• Power Loss
Each of the scenarios are described below.
5-7-4-2 Power Down
Figure 5-14 Power Down Sequence
1.) BEP detects short-term contact of Power Switch.
2.) BEP OS dialog box prompts user for power down.
3.) BEP, via PCI express, commands the GFI or MRX to stop scanning, disconnect TX circuits from
TS, stop strobe TS_ON_STRB.
4.) BEP, via USB, commands Power Supply to shutdown TSV1 and TSV2 (SetTxPS 0x68).
5.) Controller turns OFF PMX voltages.
6.) BEP, via USB, commands Power Supply to shutdown card rack (RackPower 0x6A).
7.) BEP OS performs shutdown.
8.) BEP sends PSON_N high to Power Supply.
9.) Controller turns OFF TS voltages.
10.)Controller TS_OK output signal goes low.
11.)Controller turns OFF PMX voltages.
12.)Controller turns OFF voltages +/-15, +/-6, +11V, +24V.
13.)Controller turns OFF +48V.
14.)Controller output 48V_OK goes low.
5 - 22
5
EV
Main Power Supply
USB SetTxPS
Shutdown
TSV1 and
TSV2
Shutdown
PMX Voltages USB
RackPower
Shutdown all
power supplies
except 48V
PSON_N
Shutdown all
power supplies
Section 5-7 - Power distribution
BEP GFI
or
Short-
MRX
Push
Power
Sw.
OS dialog box
GFI Stop
PCI
and TX
Dischage
Stop Scanning.
Disconnect HV.
TS_ON_STRB false.
Shutdown
Card Rack
BEP OS
shutdown of
HD and
peripherals
PSON_
N False
LOGIQ E9 S M
ERVICE ANUAL