AT&T PC 6300 - Page 441

MAINTENANCE
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ERROR NO.
PROBABLE CAUSE
MODULE
301
Addressing Test Failed
See Note 1.
302
Fixed Pattern Test Failed
See Note 1.
303
Marching Pattern Test
Failed
See Note 1.
304
Moving Inversion Test
Failed
See Note 1.
305
Bus Noise Test Failed
See Note 1.
306
Refresh Circuit Test Failed
See Note 1.
307
Parity Circuit Test Failed
See Note 1.
310
Data copied to the Video
RAM from System RAM does
not match.
Display
Controller
311
Data copied back to System
RAM from Video RAM does
not match. j
Display
Controller
320
Parity error occurred when
reading a 64-KB block of
data.
See Note 2.
330
DIPSW-0, switches 1-4, does
not agree with the actual
memory size determined
during the memory test.
Check DIPSW-0.
Refer to
Appendix A.
See notes on next page.
Figure 5-13. RAM Troubleshooting Chart
5-63
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