Subsystem Troubleshooting And Adjustments; Computer, Display, Keyboard - Teledyne 9110AH Instruction Manual

TELEDYNE Model 9110AH NO

9.3 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 be made at 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 M9110AH front panel.
3. Disconnect the 24 line flat ribbon cable (J2) that connects the computer parallel port to the
keyboard.
4. Turn on the M9110AH 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. Power down 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 8080 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 EE prom containing the setup variables. 128k 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.
Like the display, the overall functioning of the CPU can be confirmed by a simple test.
1. Locate the CPU board on the motherboard by referring to Figure 2-5.
2. Power the instrument on.
3. Locate the red LED at the top left edge of the board.
4. It should be flashing at a frequency of about once per second.
5. This flashing indicates the board is powered up and is executing instructions.
Analyzer Operator Manual, 01620, Rev. F
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