Texas Instruments 99/4A - Page 95

T E X A S IN £ T R U M E N T E H □ M £ CO M P U T E R
TROUBLESHOOTING GUIDE
doubt .
This guide
blem. You.
the
d i
I'D
take you by the problem^ not neccessarily to th
need your basic troubleshooting skills. This
new technician but still can be referenced when in
All boxes going to the right mean NO, and all box
going down mean YES. Small circles are reference
points which you may be sent back to.
Page
87
S t ar t
Page
88
VDP Check
Page 89
System Ready
Page 95
GROM Check
Page 96
Front Panel Incorrect and Keyboard
Page
97
Cassette
Page
98
Joysticks
Page
99
Mui tipi ex
Page
10 1
Memory Selection Logic
Page
103
INTREG
(Compiled by Curt Larsen and Greenwood).
86