THOMSON DD10, Installation Manual

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6. Initial Installation Diamond digital
79
LED ERROR (Master G3)
LED ERROR (Slave G10)
Blinks in the monitor mode (see above, BTS-internal use). Error in-
dication is made with the LED row STATUS.
LED LAN (G2) Network activity indicator, is switched on with each LAN coprocessor
cycle. The LED serves the qualitative judgement of the line load.
LED row STATUS (Master G13...G20)
(Slave G21...G28)
Status indicator of the power-up test.
See the section ”Error Diagnosis” in the service manual.
LED Test
G13/G21 RAM-Test
G14/G22 Service-Term (DUART 1 Channel B)
G15/G23 INT3-Test
G16/G24 EPROM-Test
G17/G25 DUART 1 Channel A, DUART 2 Channel A + B
G18/G26 INT2-Test
G19/G27 Hardware I/O
G20/G28 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 stays lighted. An exception is the lowest
LED which indicates during normal operation the error ”NO CHEAP-
ERNET 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.