Texas Instruments 990 User Manual

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2.7.1 VDT CONTROLLER PREL™INARY CHECKOUT. Upon receipt of a suspect VDT
controller from the field maintenance facility, visually inspect the controller for the problems
listed in paragraph 2.4.1. Figure 2-5 shows the maximum configuration for a VDT controller with
two controllers. Table 2-4 lists additional items that should also be checked. If a thorough visual
inspection indicates no problems, proceed with fault isolation procedures.
2.i.2 VDT CONTROLLER FAULT ISOLATION PROCEDURES. Table 2-5 lists procedures for
troubleshooting the VDT controller with a hot mock-up system. Tables 2-6 through 2-14 list
fault isolation procedures for various types of problems.
2.8 CRT MONITOR MAINTENANCE PROCEDURES
Maintenance procedures for the CRT monitor consist of a preliminary checkout to determine if
any problems exist that might be visually detected, and fault isolation procedures to locate faulty
circuit components.
2.8.1 CRT MONITOR PRELIMINARY CHECKOUT. Upon receipt of a suspect CRT monitor
from the field maintenance facility, visually inspect the CRT for signs of damage, and for flaws
caused by deterioration. Visually inspect the PWB for problems listed in paragraph 2.4.1. If a
thorough visual inspection indicates no problems exist, proceed with the fault isolation procedure
for the monitor.
2.8.2 CRT .MONITOR FAULT ISOLATION PROCEDURES. Table 2-15 lists fault isolalion
procedures for the CRT monitor in a hot mock-up system. Figures 2-10 through 2-12 are CRT
monitor schematic diagrams.
2-16
Digital Systems Division

Texas Instruments 990 Specifications

General

Brand	Texas Instruments
Model	990
Category	Desktop
Language	English