Revision:1.0(2023-01-12)
55
Battery power-on
When batteries are used to supply power, the 5VSTB power supply is also turned off during
power-off to reduce power consumption. When EC detects the PWR_BTN signal, 3V3STB_SM
and 5VSTB are enabled to send the PC_PWR_BNT signal to the PC, after which the process is
consistent with the power-on process with the AC power supply.
Figure2–12 Power-on process with the battery power supply
AC power-off
The power-off process is opposite to that of power-on. After EC receives decreased S3_N and
S4_N signals from PC, it decreases the PC_PWR_OK signal, turns off the main power supply,
and makes the device enter the shutdown state.
Figure2–13 Power-off process with the AC power supply
Battery power-off
The power-off process with battery power supply is basically the same as that of AC power
supply. The difference is that after the main battery is powered off, P5VSTB and P3V_STB_SM
should be turned off at the same time to reduce power consumption.
Figure2–14 Power-off process with the battery power supply
Stand-by
The process of entering standby is almost the same as the power-off process with the AC power
supply. The difference is that S4_N has been maintained at a high level, and the related control
process is completely consistent with the power-off process with the AC power supply.
Figure2–15 Standby process with the AC/battery power supply
Diagnostic Ultrasound System
Service Manual
2 Product Knowledge
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