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16.18 TROUBLESHOOTING THE MP-205
16.18.1 Introduction
16.18.2 Fault Evaluation
Table 16-1: Oxichip Circuit Pin Descriptions
Pin #,
Pin Name
type
49, DI
D1
50, DI
D0
51, DO
LIM
52, DI
EN*
The MP-205 is a subsystem intended for use with a host system. This section
assumes that the host provides a means of communicating with the module
through the serial host data interface described in the "OEM Pulse Oximetry
Module, Model MP-205, Engineering Product Specification."
Proceed as follows to evaluate and determine possible fault or error sources:
Indication
No communication
Error X00
no sensor
Error P00
pulse search
Waveform output
incorrect
The following table lists reported error numbers, the error description, and
recommended user action.
Section 16: MP-205 Service Manual; 044540A-0296
Signal Description
Data bit 1, to AD1
Data bit 0, to AD0
Overcurrent limit indicator, high indicates current limit
has tripped, to U4P4-6.
LED enable, high disables LED drive, low enables
LED drive, to U4P1-0.
Table 16-2: Fault Evaluation
Action
Check cables and interconnections.
Check 5-volt digital power supply.
Check processor clock Y1.
Check TXD buffer U5.
Check BAUD rate jumpers.
Sensor may be disconnected or damaged.
Cable between sensor and MP-205 may be
disconnected or not functioning properly.
The sensor may be improperly applied to the patient
or may be damaged. Try another sensor. Try an
SRC-2 pulse oximeter tester to check
MP-205 functionality.
Cover the sensor to eliminate the possibility of
ambient light interference.
The patient' s perfusion may be too poor for the
instrument to detect an acceptable pulse. Try using
C-lock ECG synchronization, if available.
Check + and –5 volt analog power supplies.
Check for proper LED drive function.
Check the signal path from the photodetector input
to the A:D converter.
Sensor or interconnecting cables may be damaged.
Interrogate module with W00 and determine if the
update rate is appropriate.
Noise may be present.
16-7
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Table of Contents
Troubleshooting
