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Teledyne API - Model 200EH/EM Operation Manual Troubleshooting & Repair
267
11.6. REPAIR PROCEDURES
This section contains some procedures that may need to be performed when a major component of the analyzer
requires repair or replacement. Note that maintenance procedures (e.g., replacement of regularly changed
expendables) are discussed in Chapter 8 (Maintenance) are not listed here. Also note that Teledyne
-API
customer service may have a more de
tailed service note for some of the below procedures. Contact customer
service.
11.6.1. DISK-ON-CHIP REPLACEMENT
Replacing the Disk-on-Chip (DOC) will cause all of the instrument configuration parameters to be lost unless the
replacement chip carries the exact same firmware version. iDAS data will always be lost and, if possible, should
be downloaded prior to changing the DOC. If the analyzer is equipped with at least one EEPROM flash chip
(standard configuration), the configuration settings are stored on the EEPROM. It is recommended to document
all analyzer parameters that may have been changed, such as calibration, range, auto-cal, analog output, serial
port and other settings before replacing the CPU chip. Refer to Figure 10-10-17 for locating the DOC and other
CPU comp
onents.
1. Ground yourself to prevent electrostati
c damage to electronic components.
2. Turn off power to the instrument.
3. Fold down the rear panel by loosening the mounting screws.
You may have to lift up the analyzer cover to prevent some connectors on the CPU board to brush
against the cover.
4. Locate the Disk-on-Chip on the CPU board.
The chip should carry a label with analyzer model number (M200EH/EM), firmware revision
(example: M200EH/EM_C7.EXE), date and initials of the programmer.
5. Remove the IC with a dedicated IC removal tool or by gently prying it up from the socket.
Do not bend the connector pins.
6. Reinstall the new Disk-on-Chip, making sure the notch at the end of the chip matches the notch in the
socket.
It may be necessary to straighten the pins somewhat to fit them into the socket. Gently but firmly
press the chip all the way in. Do not bend the pins.
7. Close the rear panel, replace the cover and turn on power to the machine.
Generally, all of the setup information will need to be re-entered, including analog input and output calibration
unless the firmware revision has not changed and the analyzer is equipped and properly configured with an
EEPROM chip. Note especially that the A/D converter must be re-calibrated, and all information collected in
step 1 above must be re-entered before the instrument will function correctly. The analyzer typically issues an
ANALOG CALIBRATION WARNING if the analog circuitry was not calibrated within 10 minutes after restart.
04521C (DCN5731)