THOMSON DD10, Руководство по установке

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6. Initial Installation Diamond digital
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DIL switch MONITOR Switch T4 for adjusting the screen color of the menu monitor (EGA or
VGA).
See the section ”Connecting a menu monitor”.
LED row STATUS Status indicator (G11...G18) of the power-up test.
See the section ”Error Diagnosis” in the service manual.
LED Test
G11 RAM-Test
G12 Service-Term (DUART 1 Channel B)
G13 INT3-Test
G14 EPROM-Test
G15 DUART 1 Channel A, DUART 2 Channel A + B
G16 INT2-Test
G17 Hardware I/O
G18 unused
At the beginning of the test, all used LEDs are lit. After having passed
the test, the associated LED is switched off. Switching-off is made
from the left to the right. This, however, is hardly perceptible when
powering up, since the tests – except for the RAM and EPROM
checks – are very fast.
If a certain test failed, the LED G18, stays lighted. An exception is the
lowest LED which indicates during normal operation the error ”NO
CHEAPERNET COMMUNICATION” in addition to the running light.
When all tests have been passed, a kind of running light appears on
the LED row. This shows immediately whether the controller operates
in the normal mode.
The running light is operated by the microcomputer only if it is not oc-
cupied with something more important.
Thus, the speed of the running light allows a qualitative judge-
ment of the the computer activity.