Teledyne MX300-I Manuel D’Utilisation
Service Manual
MX300-I
Teledyne
Analytical
Instruments
40
Symptom
Why
What To Do
Cannot adjust
calibration or alarm
settings
calibration or alarm
settings
Critical settings require
two keys be pressed in
a specific order.
a specific order.
LOCK/UNLOCK key is
active
A) If display is not flashing
press lock key once to
activate keys. Press desired
function followed by the Up
and Down key.
activate keys. Press desired
function followed by the Up
and Down key.
Note: In the event that none of these procedures produce desired
results, remove the batteries and return the unit to Teledyne for
repair.
repair.
3.9 Watchdog
The MX300-I is equipped with a watchdog circuit that continuously
monitors the electronics for proper operation. If the watchdog detects a
failure, one of the following codes will appear on the LCD.
failure, one of the following codes will appear on the LCD.
The error codes can appear on the LCD when batteries are first
installed, during normal operation or if the unit is subjected to extreme
shock. In some cases an additional digit is used in the error code to
supply additional information. For example, the error code 6 and 7 are
followed by another digit listed as (N) in Table 3.2. The error code 65
would indicate that a key is stuck and this key is the Silence key.
shock. In some cases an additional digit is used in the error code to
supply additional information. For example, the error code 6 and 7 are
followed by another digit listed as (N) in Table 3.2. The error code 65
would indicate that a key is stuck and this key is the Silence key.
In addition to supplying visual error codes, the audio device will
beep a number of times to indicate the general error in case the display is
not functional.
not functional.
NOTE: To reset the watchdog error code. Remove one battery for
5 seconds and replace. If the error persists contact your
local representative or Teledyne for assistance.
local representative or Teledyne for assistance.
Table 3-2 Error Codes
Error Code
Audio Beeps
Error
Indeterminate
2
The watchdog timer has timed out indicating a
serious software error
serious software error
30
3
Analog output is different from the expected value.
May indicate a shorted or over-loaded analog
output or a failure of the analog to digital converter
or digital to analog converter circuit.
May indicate a shorted or over-loaded analog
output or a failure of the analog to digital converter
or digital to analog converter circuit.