Kurzweil K2000 Service Manual page 67

SECTION 4
9 Calvin Read Only Checksum Teat Fail
Connection problem between Calvin and Hobbes 0
A Hobbes 0 Read Only Teat Fail
Connection problem between Calvin and Hobbes 0
B Hobbes 1 Read Only Test Fail
Connection problem between Hobbes 0 and Hobbes 1
4.14.13 Option Board Test
As of this writing, the K2000 sampling option has not been released, so there
is no need to run this test. In fact, this test is extraneous, since
installation of the sampling option will include Version 2.0 K2000 Engine
software, which will include Version 1.0 of the diagnostic software.
4.14.14
Sine Wave Test
Executing this test enables generation of sine waves at the following
frequencies: 20 Hz, 315 Hz, 630 Hz, 945 Hz, 1260 Hz, 2 KHz, 4 KHz, and 8 KHz.
The sine wave at 20 Hz is generated as soon as the test is initiated.
Pressing any button on the front panel (or turning the Alpha Wheel one click)
will generate the next-highest test frequency. The unit will return to the
diagnostic test menu when the sine wave is at 8 KHz and any front panel button
is pressed or the Alpha Wheel is clicked to the right.
This test is intended for use with an oscilloscope connected to the K2000's
audio output, and enables analysis of the purity of the sine wave generated.
If the sine wave is impure, a problem with the sound engine is suggested. To
monitor the Sine wave test, connect the scope to any of the B outputs, the MIX
outputs, or the Headphone jack.
4.14.15
Sound ROM Test
This memory test takes about five seconds to run, and checks the data
integrity of the K2000's sound ROM (the factory sounds), and the connections
between the sound ROM and the
cpu.
The test is a simple checksum procedure
for each pair of Sound ROM chips. Failures are indicated as data or address
failures, as described in the overview. The display indicates the success or
failure of each of the four blocks of Sound ROM (A-D). Each block
corresponds to two Sound ROM chips. In the unlikely event of a failure, the
engine board must be replaced, since the Sound ROM chips are soldered in
place.
4.14.16 Sound RAM Test
This memory test checks the address space of the sample RAM (SIMMs). The
purpose of this test is to determine whether the K2000 recognizes all of the
sample RAM that has been installed. The more RAM that has been installed,
the longer this test takes. The test takes approximately 80 seconds for each
RAM block containing a SIMM, regardless of the SIMM's size.
NOTE: for Version 0.4 of the diagnostic software, this test is significant
only if the unit contains SIMMs of 4 megabytes or smaller. If the unit
contains larger SIMMs, the test will indicate success even if the SIMMs are
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