Mara Delay Ram; Mara Sound Rom; Audio Output - Kurzweil sp5-8 Service Manual

Description of Tests

MARA Delay RAM

MARA Delay RAM
This is a write/read test to check the Delay RAM connected to MARA. The Delay RAM test
first checks address and databus connectivity and then reports which bits are not functioning
to aid troubleshooting.
Error reporting for this test identifies whether the error is likely to have occurred during
writing or during reading. Data value mismatch errors are reported in hexadecimal values
starting with "0x" followed by 8 hex digits. If the data value that was ReadBack differs
greatly from the value Wrote, it could mean there was an address bit error, or one or more of
the control signals are bad.
A failure of this test would indicate a problem with the DDR SDRAM (U12), MARA (U5), or
the connections between them.

MARA Sound ROM

This test calculates and verifies the checksum of the on-board Sound (Sample) ROM. It also
tests the data and address lines from MARA to the Sound ROM. This test may also report
errors when the MARA Validity Test fails.
A failure of this test may indicate a problem with the Sound ROM (U13) or its connections to
MARA.

Audio Output

Warning: This test produces loud sine and sawtooth waves. Before beginning this test, turn
the volume on your sound system down to minimum. During this test, the volume slider on
the SP5-8 is disabled.
This is not a test that fails. It is an interactive test for the entire audio chain. However for this
test to pass reliably, the MARA Validity, MARA Delay RAM, and MARA Sound ROM tests
should pass. MARA plays back sine wave samples from ROM and sawtooth waveforms from
Delay RAM. Therefore, MARA and the Delay RAM need to be functioning for this test to
produce a clean audio waveform.
Use the Chan / Param Up or Down button to select
then press the Next button to play the selected waveform.
While playing each waveform, use the Chan / Param Up or Down button to move through a
parameter menu for each waveform. Parameters include Output, Amplitude, and Frequency.
With any of these parameters shown in the display, press the Next button to adjust the
parameter. Once the parameter value is shown, use the Chan / Param Up or Down button to
adjust the parameter value. Refer to the following table for each parameter's range of values.
3-4
or ,