Teledyne 200AH 用户手册

 

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. 

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 M200AH front panel. 

3.  Disconnect the 24 line flat ribbon cable (J2) that connects the computer parallel port to the 

keyboard. 

4.  Turn on the M200AH 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. 

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.  Figure 2-6. 

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.