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Operation
The digital system is automatically diagnosed when the main power is turned on. Result of the diagnosis
is displayed on the D3 (DIAG) LED on the ASW-58 board. Troubleshoot the digital system from the
display on the D3 (DIAG) LED.
At the same time, the fixed student-pair pattern is formed by the cross-point IC on the respective boards
(LU-800B/LU-801B). The fixed student-pair pattern thus formed, enables to diagnose if the correct gate
is opened by inputting and outputting the audio signal to and from the checker tool.
The LLC-8000A enters the CONFERENCE mode by operating the 7 key switches. The desired fixed
CONF. pattern can be formed by the combination of the 7 key switches as shown below.
When a trouble occurs in the audio system, locate the signal line in which the source of trouble is located,
using the technique of forming the fixed student-pair patterns and the fixed CONF. pattern as described
above.
Digital system check
Check the digital system from illumination of the D3 (DIAG) display.
Check result
ALL
OK
ALL
NG
ROM
NG
RAM
NG
RS-232C
NG
(ROM + RAM)
NG
(ROM + 232C)
NG
(RAM + 232C)
NG
1 (sec)
ROM
NG
ON
RAM
NG
ON
ON
RS-232C
NG
ON
ON
ROM + RAM
NG
ON
ROM + 232C
NG
ON
RAM + 232C
NG
ON
ON
LLC-8000A
Illumination of the D3 (DIAG) display
Turns on
Turns off
Blinking once, is repeated
Blinking twice, is repeated
Blinking three times, is repeated
Blinking (once + twice), is repeated
Blinking (once + three times), is repeated
Blinking (twice + three times), is repeated
4 (sec)
4 (sec)
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
2-3. Self-diagnosis of the ASW-58 Board (LU-800B/LU-801B)
ON
ON
ON
2-9
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