Page 1
Emax Diagnostics and Functional Test Procedures
© 1987 E-mu Systems Inc. Page 1
EMAX DIAGNOSTICS
The Emax contains a number of on-board diagnostic tests and trim
procedures. These can be accessed or read from the front panel
without even opening the unit!
BOOTPROM
DIAGNOSTICS
The bootprom diagnostic tests are invoked each time Emax is
powered up. The bootprom tests are very simple tests and the
results should not be taken as absolute truth. The tests can,
however, point a technician into a general problem area before
even opening the unit.
On power up, all the LEDs are lit. As each test is passed, an LED
is turned off. When a test fails, it leaves the LED on, but goes on to
the next test. Below is a description of the test that failed for each
LED left on.
Enter LED:
Unable to write to DRAM at location 17FFFH and then read it back.
Dynamic Allocation LED:
Unable to initialize the LCD. If this test fails, the unit will lock up.
Transpose LED:
Unable to write a pattern to a page of DRAM (8001-8100) and then
read it back.
Sequencer LED:
Unable to write and read back an E-Chip register.
Master LED:
Unable to write and then read back a test byte to location 0 of the
E-Chip RAM.
Preset Definition LED:
Wrote command to 1772 Floppy Disk Controller to restore head on
the drive, but the drive never reached track 0, or the 1772 never
responded.
Analog Processing LED:
Unable to load software from disk.
Page 2
Emax Diagnostics and Functional Test Procedures
© 1987 E-mu Systems Inc. Page 2
SPECIAL FUNCTION DIAGNOSTICS
The on-board tests are hidden in the Special functions and can be
accessed in the following manner:
1. Activate MASTER 8 (Special). The display will say:
Special
[1 - 6] / Slider
2. Press 8 on the keypad. The display will now say:
Emax Diagnostics
Are You Sure Y/N
Press Yes to enter diagnostics.
The display will now say:
Emax Diagnostics
[1 - 7] / Slider
Moving the data slider will show the following tests and
calibrations:
1. Bank RAM Test
2. ERAM Test
3. RS-422 Test
4. Wr/Ver Fl Test
5. Ver Fl Test
6. Panel Test
7. Filter Trims
1. BANK RAM TEST
This tests the bank portion of the main processor (32008)
RAM. This is the same RAM that the diagnostics are running
from, so this RAM probably has to be working in order to be
able to test itself!
When this test is selected, the display will say:
Testing Bank RAM
Hint: A good way to
remember this is: 2 numbers
past the last choice.
