Chapter 6 – Maintenance
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13841 Rev A
203
Static random-access memory (SRAM), 256 KB [1MB]
Erasable, programmable read-only memory (EPROM), 256
KB [1MB]
Serial communication interface (RS-232)
Timing pulse output circuitry for the Model 135M-12
Strobex Tracker
The microprocessor chip executes the operating code that resides
in the EPROM. This chip coordinates sampling with the analog-
to-digital converter (ADC) and also receives, processes, and
stores digitized signals from the ADC.
Additionally, the microprocessor chip scans the keyboard,
interpreting user inputs, programming the vibration and
tachometer input channels, and displaying results and
information on the liquid-crystal display (LCD) screen. Also, the
microprocessor transmits data to the outside, that is, to a printer
or PC, via an RS-232 serial interface and a nine-pin connector.
For more information on the EPROM chip, including
replacement instructions, see Section 6.3.2 “EPROM
Replacement”.
6.2.2 Display Subsystem
The Vibrex unit’s display is a 64-by-128 pixel, reflective LCD.
These numbers equate to 8 lines by 21 characters. The display
interfaces with the main PCB through a 20-pin connector.
A programmable potentiometer circuit on the main PCB controls
the screen display’s contrast. This circuit retains the last contrast
setting, even after powering down. Adjust the potentiometer,
using two keys located on the keyboard to the right of the
display.
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