Alesis QS7.1 Service Manual download pdf (Page 29)

Alesis QS Series Keyboards Service Manual V1.00 20 11/19/06

3.00 Test Procedures

If at all possible, user memory should always be saved (PCMCIA Card or MIDI SYS-EX)

prior to service. It’s also important to remember that user data itself may be corrupted for a

variety of reasons. So if for some reason a unit continues to “crash” when reloaded, it’s not

unreasonable to expect bad data to be the cause.

3.10 Self Tests

The QS Series Software is specifically designed to assist in troubleshooting hardware

problems. This assistance comes in the form of a series of self test routines that check various

aspects of the hardware. There are two different methods of accessing these routines. One is

an automated run through all tests, while the other allows the choice of which individual tests

are run. Note that due to the extreme difference in the QSR’s front panel, the self tests

themselves and the method they are accessed are also different. See Section 3.13 for a

thorough discussion of the QSR Self Tests.

✔ Pressing “0” and “03” during Power up reinitializes all software values to their ROM presets.

✔ Pressing “0” and “10” during power up initiates the Automated Self Test Mode.

✔ Pressing “0” and “00” during power up establishes Individual Test Mode.

3.11 Automated Test Mode

Before initiating the automated self Test Mode it is necessary to plug in all necessary

cables (MIDI IN to MIDI OUT, PC Serial Test Cable). If this is not done the test will fail when

the missing cable is encountered. Pressing the Value ↑ button will skip the failed test and

proceed to the next. (See the next section for a full description of each test)

3.12 Individual Test Mode

When in Individual Self Test Mode, the Value ↑ and Value ↓ are used to select which

test is to be run and pressing “STORE” will select it. All tests stop upon completion of the test

(display shows “TEST PASSSED” or “TEST FAILED”). Pressing Value ↑ or Value ↓ will exit the

test and return to the Individual Test Menu. The tests are:

1. TEST EPROM - This routine does a Checksum test of the Software EPROM. This test ends

with either a pass or fail. A failure probably indicates a faulty EPROM, but may also indicate

a problem with the H8 itself, or in fact any of the other device attached to the data and

address busses, or the busses themselves (i.e. broken address trace).

2. TEST SRAM - This routine performs a functionality test of the H8’s Storage memory. As

with the EPROM test above, a failure here probably indicates a truly faulty SRAM, however

a persistent failure (one that occurs after the SRAM has been replaced) may be in fact due

to errors in the H8’s subsystems.

3. TEST MIDI I/O - A MIDI Cable must be connected between MIDI IN and MIDI OUT prior to

starting this test. It will the send and receive a data stream to ensure functionality of both IN

and OUT. Note that due to the fact that the MIDI Input and Output circuits are internally

grounded (through the PCB traces), this test can not detect a broken ground on either jack

(i.e. poor solder or broken jack pin).

4. TEST PC I/O - Prior to initiating this test pins 3 and 5 must be shorted together (this can be

done with a paperclip, although a cable expressly made for this purpose is preferred) and

the PC/MAC switch set to the PC position. Since there are so few components in this

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Alesis QS7.1 Service Manual Page 29

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