Other Problems With The Monitor - Teledyne MX300 Operating/Service Instructions Manual

Service Instructions
50 5
6 (5) 6
(There is no
indication of
which key is
stuck)
7(2) 7
(There is no
indication of
the type of
DAC failure)

3.10 Other Problems with the Monitor

Most other problems arise from either mechanical damage to the
Monitor or electronic component failure.
Repair or troubleshooting the PCB or individual components on the
board is not feasible. Under most circumstances, a replacement of the
entire PC Board is recommended. If the repair diagnosis indicates prob-
lem with the PCB, the Monitor must be returned to the factory for PCB
replacement.
Teledyne Analytical Instruments
The ADC circuit failed during POST.
A stuck key has been detected. The second
digit example (5) on the display shows
which key is stuck:
0 - Low Alarm
1 - Batt
2 - Cal
3 - Up
4 - Down
5 - Silence
6 - High Alarm
7 - Alarm Test
8 - Key Lock
A failure has occurred during the automatic
calibration of the digital to analog converter
(DAC) circuit. The second digit example (2)
shows the type of digital to analog failure.
0 - Measurement
1 - High Test
2 - Low Test
3 - Offset Cal
4 - Gain Cal
MX300
28