Mindray BeneVision N19, Service Manual

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BeneVision N22/BeneVision N19 Patient Monitor Service Manual 2-9
2.3.2 The Secondary Screen of N22/N19 Uses Independent AC Adapter for Power Supply
The connection is as shown below:
N22/N19 System
Primary
display
(split type)
Secondary
display
Main unit
AC adapter of
the secondary
display
AC power 1
AC power 2
Only signals, no power supply
User
Battery
Primary display
(all-in-one)
The battery is in the main unit, and the secondary screen is connected to the adapter. The primary and secondary
display controls are independent of each other, allowing the secondary display to be turned on or off without affecting
the complete system.
2.4 Signal Logic Flow
2.4.1 Startup Signal Flow
Major power-on process:
 Startup signal -> DCDC board power-on 12V, 3.3V, and 5V
 The main board operates based on the power-on sequence of the PC
 The main control enters BIOS, initializes peripherals of the main control, reads EDID and sets the display to ON

The front housing enters the initialization state through the 12V power conversion
 The SMR enters the initialization state through the 12V power conversion

Handshake would be implemented by the system after 40s, and the connection is established between the front
housing, SMR, and the main control