Diagnostics
Description of Tests
2-5
RAM/PRAM
Caution
: This test destroys all non-volatile user RAM! If you haven’t already saved user data,
power cycle the unit and save the data now. If you need instructions, refer to
on
The RAM/PRAM test performs a data test and an address test on each of the processor RAM
sections. These sections include volatile RAM at addresses 0x2100000 through 0x213FFFF and
the non-volatile RAM at addresses 0x02000000 through 0x0203FFFF.
Figure 2-5
LCD example, RAM/PRAM test
If the PRAM optional expansion non-volatile RAM is installed, this test checks addresses
0x01F00000 through 0x01FFFFFF. After the volatile and non-volatile RAM is tested, the message
PRAM
Present
is displayed in the LCD. If the PRAM optional expansion is not installed, the
LCD shows
PRAM
Absent
.
The data test phase of this test writes a value derived from a 23-word test sequence to each RAM
location. While the value is in memory, it is bitwise-inverted twice. This should bring the data
back to its original value. The data is then compared with the original data. If a difference is
detected, an error occurs and the test fails.
The address-test phase of this test writes RAM addresses sequentially throughout RAM. The
addresses are then read back. If a difference is detected, an error occurs and the test fails.
A failure of this test may indicate a problem with the RAM or related circuitry.
Note
: If a PRAM option is installed and the test fails, remove the optional PRAM Board and
rerun the test.
If the PRAM optional expansion RAM is installed and the LCD shows
PRAM
Absent
, be sure
that the PRAM option board is correctly installed. If the LCD doesn’t show
PRAM
Present
,
there may be a problem with either the PRAM Board, the Engine Board or related circuitry.
I/O Port
The I/O Port test mutes and unmutes the audio circuitry to verify that the signal is transmitted
correctly.
A failure of this test may indicate a problem with the Engine or DSP Board.
Test Item : RAM/PRAM
PRAM Present
Please wait. Testing...Success
Press any key to continue...
Summary of Contents for K2600 Series
Page 4: ......
Page 12: ...Kurzweil K2600 Series Service Manual Contents viii...
Page 30: ...2 12 Diagnostics Description of Tests...
Page 50: ...3 20 K2600R Disassembly Assembly Front Panel Assembly...
Page 86: ...4 36 K2600 K2600X Disassembly Assembly K2600X Keyboard Assembly...
Page 102: ...5 16 Troubleshooting K2600R Interconnect Diagram...
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