Ohmeda 3000 - Page 13

1/Functional Description
If the test loop is entered on power up by depres-
sing the Apgar Tones switch the program will loop
until an error is detected. If an error is detected the
unit will then stop the test loop, the error code will
be displayed in the elapsed time display, and the
critical alarm will sound. The power must be
switched “Off" to exit this mode.
Self Test Loop
The unit cycles in the following loop until the power
is removed.
Power up tests performed:
Instruction test (“Error" #01)
Check calibrate high (“Error" +02)
Check calibrate low (“Error" #03)
Checksum (“Error" #04)
Ram test ("Error" #05)
Test port 1 lines (“Error” #06)
Check if ADC is converting. (“Error” +07)
Display loop test:
Seven Seg Bar Graph Alarm LEDs
Display's Segments
All 1's 1,11 Probe fail
All 2's 2,12 Pat temp
All 3's 3,13 Sys fail
All 4's 4,14 Heater “Off”
Ail S's 5,15 Reset timer
Al 6's 6,16 Spare LED
All 7's 7,17 All “Off”
All 8's 8,18 All “Off”
Al Ys 9,19 Al "Off"
All 0's 10,20 All “Off”
Al "Off" All “Off" Al "Off"
The unit returns to start of self test loop.
Error Codes
Error Description
#01 Instruction.test fails
#02 Calibrate high fails
#03 Calibrate low fails
#04 Checksum fails
#05 Ram test fails
#06 Port 1 lines
#07 ADC not converting
#08 Hardware triac timer
#09 Heat not controlled
#10 Line voltage out of
range.
Mode LEDs Heater and
Lights
Servo “On"
Servo “Off”
Servo “On"
Manual “Off”
Manual “On"
Manual “off”
Apgar “On”
Apgar “Off”
Apgar “On”
All “Off” "Off"
All “Off” “Off”
Possible Cause
Microprocessor 8031 defective
ADC calibration
Cal high resistor defective
ADC calibration
Cal low resistor defective
Eprom defective
Microprocessor 8031 defective
Microprocessor 8031 defective
VO expander 8243 defective
Microprocessor 8031 defective
A/D Converter ADC3711 defective
Voltage Reference LM10 defective
I/O expander 8243 #2 defective
Logic
gate 4020B defective
IC in triac test area defective
Heater triac defective
Microprocessor 8031 defective
Heater opto-isolator or
driver defective
Line voltage compensation pot.
on power supply board not
calibrated.
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