M805-00
Functional Tests
8.11
Copyright TEL
30/09/96
8.2.4
Test Mode 3
8.2.4.1
Introduction
Remove any shorts from LINK 1.
Set the DIP switches (SW301 & SW302) as shown in Table 8.4 (note that only
switches D0, D1 and D2 define the test mode).
Apply power to the ASP card.
The "TEST MODE" LED should light up. All other LEDs should be extinguished.
If the "WDR" LED is lit, it can be extinguished by a brief press of the "RESET" but-
ton (SW1) on the front of the ASP card.
Note:
A brief press of the "RESET" button will reset the "WDR" LED, while a
longer press (approx. half a second or longer) will reset the ASP card.
SW301
SW302
-- Not relevant to card setting.
Note:
Depending on the type of switch used:
if a switch is pushed down in the position labelled "OFF", it is at logic 1;
or
if the switch is pushed towards the LED indicators on the ASP card to the
"OFF" position, the bit value is a logic 1.
Table 8.4 DIP switch settings for placing the ASP card in test
mode 3.
8.2.4.2
Audio Interface Circuit
In this test the electronic relays are in their normal energised state, allowing audio out-
put to be passed to the connector. A signal is fed into the auxiliary input of the main
audio interface circuit (AIC), digitised and passed into the digital signal processor IC
(DSP). The DSP then passes the digital signal through a low pass filtering algorithm
with a cut frequency of 3kHz. The filtered signal is then passed back into the AIC,
reconverted into analogue and passed into the AIC's main output. The signal path is
thus:
the signal into input 1 is passed to output 1.
1
1
1
--
--
--
--
--
D0
D1
D2
D3
D4
D5
D6
D7
--
--
--
--
--
--
--
--
D8
D9
D10
D11
D12
D13
D14
D15
Summary of Contents for T805
Page 16: ...4 2 ASP Card Operation M805 00 30 04 95 Copyright TEL ...
Page 44: ...7 18 Initial Programming Adjustment M805 00 30 09 96 Copyright TEL ...
Page 70: ...14 1 2 PCB Information M805 00 30 04 95 Copyright TEL ...
Page 89: ...Copyright TEL 30 09 96 M805 00 T805 Front Panel PCB Information 14 5 3 ...