Lexicon 200, Руководство по обслуживанию, Страница: 28 / 90

MPX 200 Service Manual
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If the test failed, the (Red) LEVEL LEDs will light.
Lexichip3 INT Test (4)
This is the same test that resides in the power up diagnostics. It was included in the Extended Diagnostics
for troubleshooting purposes.
The Interrupt test will verify that the Lexichip3 interrupt (ZINT/) is working and occurring at the proper
intervals. The Lexichip3 will provide MPX 200 with the interrupt (ZINT/) to the Z80’s maskable interrupt line.
Before the test is executed, the following test code will be displayed on the Diagnostic LEDs, along with the
test number on the 7-segment displays:
Test # Test Name Diagnostic LED
7-segment
display
4 Lexichip3 INT COMPRESSOR “Threshold” 4
Pressing the Load button will execute the test.
Pressing the Tap/Cancel button will run the test continuously.
When the test is executed, the leftmost 7-segment display will display an “r” to indicate the test is running.
The pass/fail status of the test is displayed on the 7-segment displays and front panel LEVEL LEDs.
If the test passed, the (Green) LEVEL -30dB LEDs will light.
If the test failed, the (Red) LEVEL LEDs will light.
Lexichip3 ADF Test (5)
This test will verify that the Lexichip3 Audio Data File memory is working.
The Lexichip3 Audio Data File (ADF) is a fast synchronous 128-word SRAM that provides audio data
buffering and storage for: external memory references, Serial I/O, and the Host-to-Lexichip data port. ADF
locations also function as ARU Registers and as scratchpad memory. This test will verify that the Lexichip3
Audio Data File is working properly.
Before the test is executed, the following test code will be displayed on the Diagnostic LEDs, along with the
test number on the 7-segment displays:
Test # Test Name Diagnostic LED
7-segment
display
5 Lexichip3 ADF EFFECTS “Echo/Delay” 5
Pressing the Load button will execute the test.
Pressing the Tap/Cancel button will run the test continuously.
NOTE: During the Lexichip3 ADF test, several LEDs may flicker. This is normal operation, and not
considered a failure in the unit.
When the test is executed, the left most 7-segment display will display an “r” to indicate the test is running.
The pass/fail status of the test is displayed on the 7-segment displays and front panel LEVEL LEDs.
If the test passed, the (Green) LEVEL -30dB LEDs will light.