Texas Instruments TI-99/4A User Reference Guide

Maintenance and Service Information
IN CASE OF DIFFICULTY
In the event that you have difficulty with your computer. the tollowmg; mstructlOns may
help you to analyze
the problem. You may be able to correct your computer problem
without returning it to a service facility. If the suggested remedies are not successful, contact
the Consumer Relations Department by mail Dr telephDne (refer to IF YOU HAVE
QUESTIONS OR NEED ASSISTANCE later in this section). Please describe in detail the
symptoms of your computer.
If one of the following symptoms appears while operating with the optional peripheral(s) or
accessories. remove the device. If the symptom disappears, refer to the manual for the
peripheral or accessory in question.
SYMPTOM
Con:solc indicatOl' light will not COrne
on when switch is turned on,
No picture.
No sound.
Cassette recorder will not operate
when connected to console, but does
work properly when not connected,
Cassette recDrder will nOl Sa ve Dr
LDad data properly,
Remote Controls will not operate.
BASIC program is cleared by
insertion
of a Command Module.
Stray characters appear or other
erratic operation occurs or computer
will not respond to keyboard input.
REMEDY
• Check that transfom1er power cord is plugged into
the wall.
• Ensure that power cord is cDnnected to the rear of the
console.
•
Check that power is on, and screen controls are set
for optimum picture. Ensure that cables are properly
connected as specified in the Color Monitor
Operating Guide and Warranty.
• Sec that volume control is turned to proper level.
Check connection of cables.
• Ensure that cassette is connected to the g-pin
connector on the rear of the umt.
• See "General Information."
•
Rcmcmber that the cassette motor is controlled by
tht-'. C'.omplltf'r. Rprlcl tht: instructions in the "Cassette
Interface Cable" section.
•
Ensure that unit is connected to the 9-pin connector
011 the left side of the computer cOl1solt:. and that
ALPHA LOCK is in the off (up) position.
•
Remember that only certain software is designed for
use with the Remote ContrDls.
•
This is a normal reset procedure designed to protect
your color screen
• Static electricity dischaq;es from the user to the
cUllsulc call ahcl IJIU!!,L Wil Ui::l.ta stUl cu ill the jllt~rnal
memory. To correct this problem turn the console off
and then on.
A
Command Module especially designed to verify proper operation of the major functions of
your system is available at your retailer, You can also purchase the Diagnostic module for
use at home.
User's Reference GUlde
V-I

Texas Instruments TI-99/4A Specifications

General

Brand	Texas Instruments
Model	TI-99/4A
Category	Desktop
Language	English