Mindray DPM 1 Manual de Serviço descarregar pdf (Página 17)

Circuit Principle

2-5 Pulse oximeter Service Manual

R85 work together to prevent the locking of the CPU.

Fig 2-6 Delay Circuit Block

The power-on and power-off signals through two diodes constitute a AND logic output

signal named PCON signal, which directly controls the ON/OFF. Resistor R111 is

necessary for the AND logic circuit. R95, C82 and E12 form a RC filtering network to

protect the circuit from electrostatic charge.

Fig 2-7 Switch On Circuit

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Mindray DPM 1 Manual de Serviço Página 17