Service manual

Service Manual
PASSED ST506 int. correct setup
PASSED ST506 ext. correct setup
PASSED FDC correct setup
PASSED Serial correct setup
PASSED Ethernet I correct setup
PASSED Ethernet II correct setup
PASSED SCSI Podule correct setup
PASSED ROM Podule correct setup
PASSED UPM correct setup
PRESS <SPACE BAR> TO CONTINUE
Press the space bar.
The following will be displayed:
COMPUTER TYPE TEST V x.xx DEALER
PASSED IO correct setup
PASSED IO MIDI correct setup
PASSED MIDI correct setup
PRESS <SPACE BAR> TO CONTINUE
Action if test fails: Check that the system matches the
data file selected. A guide to the test data file can be to
read the system variables that start
Test_xxxx :y.
Test_Serial_port : 1 serial port
fitted.
If a module is fitted, the related test system variable
should exist, Comptype verifies this. If it is a version
number check, then comptype compares the version
number with the version fitted. The value attached to the
string is only used in this test when checking version
numbers or memory size. If the value is non-zero, it
means the test is to be executed.
Test_MEMC_Version : 101 MEMC version
la fitted
Speaker tests
You should be familiar with the correct sounds before
running these tests.
The screen will clear and the following will be displayed:
SOUND TEST Vx.xx DEALER
Running Loudspeaker Test
Listen and check sound quality
Stereo Output Channel
Flashing arrow heads (««) will then point alternately
left and right depending on the stereo channel being
used.
The test consists of a repeating sequence of 8 musical
notes.
1 Listen to the sequence of notes.
2 Check for any deviation from the known good sound,
and ensure that a clean sound is being emitted from
both channels.
3 Listen for any interference or background hissing from
the speaker.
Press F5 if correct, or F8 if not correct, to continue. You
cannot press a function key until at least one cycle of
each sound channel is complete.
Action if test falls: If no sound, check speaker
connections. Substitute a known good speaker and
retest. If OK, replace speaker. If test fails, change the
main PCB, or see Part 5 - Main PCB fault diagnosis.
Headphone tests
The headphone test is similar to the speaker test except
that the sound is sent through the headphones. The
same checks that are used for the loudspeaker test
should be undertaken. The first four notes are played in
one headphone and the next four notes in the other
headphone.
The screen will then clear and the sound test results will
be displayed.
Action if test fails: If no sound or poor/faulty sound on
known good headphones, change the main PCB, or see
Part 5 - Main PCB fault diagnosis.
Press the space bar to continue.
This is a subjective test – note any failures.
Screen tests
You should be familiar with the correct screen displays
before running this test.
The screen will clear and the following will be displayed:
RUNNING Standard Colour Tests. DEALER
PRESS <SPACE BAR> to continue.
These tests consist of a series of screen displays. You
proceed through the tests at your own pace.
When you press the space bar the screen test will
commence.
Standard monitor screen test
You will see a screen display in mode 0, consisting of a
series of white lines radiating from the top left hand
corner across which a three-coloured bird will travel from
bottom left to top right, where it will rest.
Check the accuracy of the lines, and the movement and
integrity of the bird/cursor.
Press F5 if correct, or F8 if incorrect, to continue.
This is a subjective test – note any failures.
Following this display are four test cards, each
surrounded by a contrasting border and consisting of 16
concentric circles beneath a horizontal band. The band is
divided into 16 sections with a pale border highlighting
the leftmost 8 sections. The object of the cards is to
display 16 shades, the border should be mid-range.
The four test cards are:
• Red
• Green
• Blue
• Grey scale
Part 4 - Fault diagnosis Issue 2, June 1991 4-9