Section Three: Testing; Overview - Atari 520STE Field Service Manual

SECTION THREE: TESTING

3.1 OVERVIEW

This section pertains to the test equipment, diagnostic software, and test procedures
used to verify correct operation and repair of the STE computers. The diagnostic
cartridge should be used if possible. If the unit gives no display or RS232 output
when running the cartridge, see Section 3.3: Troubleshooting a Dead Unit.
Since the STE system is quite complex, it should not be expected that this document
can cover all possible problems or pinpoint the causes; rather, the intent here is to
give a systematic approach which a technician can use to narrow down a problem to
its most likely source. Experience in troubleshooting computer systems is assumed.
Knowledge of the 68000 processor may be helpful.
Economics will be an important consideration; due to the low cost of the STE
computer line, little time can be justified in troubleshooting down to the component
level when it may be cheaper to replace the functional sub–assembly.
3.1.1 Test Equipment
The following equipment may be needed to test the STE computer:
Atari SC 1224 or SC 1435 RGB Monitor (or similar)
•
Atari SM 124 Monochrome Monitor (or similar)
•
Atari SF354 or SF314 External Floppy Disk Drive
•
ST Port Test Fixture, C103589–001 (DMA Test Fixture)
•
STE Port Test Fixture. C301153–001 (Genlock Test Fixture)
•
RS232 Loop–Back Connector
•
MIDI Loop–Back Connector, C302272–001
•
STE Test Diagnostic Cartridge, Revision 1.5 or later (pln C302260–001)
•
Blank Double Sided 3.5" Diskettes (2)
•
RS232 Terminal (or STE with VT52 emulator)
•
RS232 Null Modem Cable (25 Pin Female–Female)
•
In addition, the following items may be needed to troubleshoot and repair failed
computers:
Two Channel Oscilloscope
•
Small Hand Tools
•
Spare Parts
•
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