Altronic CPU-2000 Instruction de service - Page 18
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9.0 TROUBLESHOOTING
Perform all tests at a test stand speed of 360 RPM with a 4-cycle test memory. The following tests
assume an adequate 12-24 Vdc power source and properly installed magnetic and Hall-effect pickups.
9.1 POWER MODULE - The following tests are to be performed with a known good Logic Module.
PROBLEM
No output
One output
does not fire
Only one output
fires or fires
consistently
No Multi-Strike
function
*
Logic Module display will read LOW OUTPUT VOL TS ON A (or B) SIDE
(reference section 10.6 of CPU-2000 01).
**
Logic Module display will read PRIMARY FAULT (reference section 10.6 of CPU-2000 01).
9.2 LOGIC MODULE - The following tests are to be performed with a known good Output Module. The
tests assume a fully functional test stand.
PROBLEM
Timing varies
No function
from keypad
No timing
change from
4-20 mA input
***
May indicate a defective display or logic board.
9.3 LOGIC MODULE DIAGNOSTICS MESSAGES - If any of the following diagnostic messages appear
when testing the Logic Module then replace the logic board.
A.
GT PICKUP FAULT MISSING PULSES
RS PICKUP FAULT MISSING PULSES
B.
C.
HE PICKUP FAULT MISSING // NO-SYNC
D.
RING-GEAR FAULT xxx TEETH READ where xxx is not equal to the number of teeth on the test
stand.
E.
BOTTOM BOARD µP CHECKSUM FAILED
F.
CURRENT LOOP OUT OF RANGE
TEST
TEST INDICATION
Section 4.1
Low voltage *
Section
Missing discharge
4.2/6.2
on stand or scope
Section
Only one spark gap
4.2/6.2
is firing
Section 6.3
Outputs do not
have four firings, 4-
5 milliseconds apart
TEST
TEST INDICATION
Section 7.1
Timing other than
as shown
Section
Pressing keypad
7.1/7.2
has no effect
Section 7.2
Timing does not
change when 4-20
mA input is varied
CORRECTIVE ACTION (Figs. 3,4)
Replace bottom power board (2).
Replace top power board (3).
Replace top power board (3).
Measure voltage at pin 10 of Vss of
the ribbon cable on top power board.
If voltage is 5V. in Multi-Strike mode,
replace top power board. If voltage
is 4V. or less, replace bottom power
board.
CORRECTIVE ACTION (see Fig. 2)
Replace logic board (9).
Assure keypad is plugged in to
display board. Replace keypad (2).
***
Replace logic board (9).
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