Lexicon 960L Service Manual page 61

Red 0 0
Yellow 0 0
Green 1 1
(0=OFF, 1=ON)
1. The YELLOW #6 LED was turned on to indicate a Keyboard Test failure because the External
Keyboard was not detected.
2. The YELLOW #7 LED was turned on to indicate a Loop Back Test failure because the RS-232
Wraparound Plug was not detected.
3. The RED #8 LED was turned on to indicate a Keystuck Test failure because the 'PROGRAM' +
'ENTER' keys were being held.
Prior to the execution of the Power On Self Tests, the Realtime Clock is tested. This test verifies the
operation of the 32.768kHz crystal on the SA-1100.
TEST 1: Motor Waveform Registers Test
This test writes to control registers in SA-1100, then verifies the value written can be read.
TEST 2: Motor Control Registers Test
This test writes to control registers in SA-1100, then verifies the value written can be read.
TEST 3: A/D Control Registers Test
This test writes to control registers in SA-1100, then verifies the value written can be read.
TEST 4: A/D Self Test
This test reads the MIN, MID and MAX values based on the reference voltage of the A/D converter.
TEST 5: (Not Used)
TEST 6: External PS/2 Keyboard Test
This test initializes the External Keyboard, and tests for the presence of a keyboard connected to the 'AUX'
port of the LARC2 by sending 8 characters out the port, and monitors any data that is received. The data
received is then compared to what was sent.
NOTE: This test requires an External Keyboard connected to the 'AUX' port. Otherwise the test will fail
when an External Keyboard is not present. Diagnostic error messages are also sent to the Debug Port to
indicate when a failure has occurred as shown in the example below.
**ERR**KB01** TXRDY= 0. should be 1, GPIO= fffc7ec
**ERR**KB02** IBFULL= 1 should be 0, Stat= 12, GPIO= fffc7ec
**ERR**KB03** Keyboard Timeout
TEST 7: Host Port (Loop Back) Test
This test checks for the presence of a Loop Back Plug connected to the 'HOST' port of the LARC2 by
sending 8 characters out the port, and monitors any data that is received. The data received is then
compared to what was sent.
NOTE: This test requires a Female RS-422 Wraparound Plug installed in the 'HOST' port. Otherwise the
test will fail when the Loop Back Plug is not present. A diagnostic error message is also sent to the Debug
Port to indicate when a failure has occurred as shown in the example below:
0 0 0 0
0 0 0 1
1 1 0 0
0 1
1 0
0 0
Lexicon
6-29