Teledyne 6200A - Sulfides analyzer - Manual (Page 173)

TAI Model 6200A SO
2
Analyzer Operator Manual, 02164, Rev. G
9.3 Electronic Subsystem Troubleshooting and
Adjustments
9.3.1 Computer, Display, Keyboard
The purpose of this section is to determine if the computer subsystem electronics hardware are
working properly. Assessment will make it the board level.
9.3.1.1 Front Panel Display
The front panel display is a 2 line by 40 character display. It has its own microprocessor to decode
commands and display characters. It contains a self test feature. To test the display:
1. Turn off the power to the instrument.
2. Fold down the 6200A front panel.
3. Disconnect the 24 line flat ribbon cable (J2) that connects the computer parallel port to the
keyboard.
4. Turn on the 6200A power switch.
5. Observe the front panel display. If the display successfully completes its power on self test, it
will display a single underline character "_" in the left most character of the top line of the
display. If this character is present, the display is working properly.
6. Turn off the power of the analyzer, and re-attach the 24 line cable to J2, and proceed to the
next test.
9.3.1.2 Single Board Computer
The SBC40 is a full function computer designed for instrument control applications. It consists
of a 16 bit 8088 microprocessor, 2 serial and one parallel ports, standard bus interface, and 4
sockets for memory. The memory sockets consist of: 256k ROM containing the multitasking
operating system and application code, 32k E
2 PROM containing the setup variables, 256k RAM
containing data collected by the instrument, and a time-of-day clock to provide event timing
services. The overall function of this board is quite complex. Complete testing of this board's
functions is not possible in the field. If component level troubleshooting of this board is
necessary, contact the factory for schematics.
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