Solutions to a few MC test failures
Problem:
In
the TDC display, red LED might be on.
Cause:
The
TDCs might be wrongly configured
Solution:
Reconfigure
the TDCs
Go
to the Startup page.
Click
on the Configure MC button.
Select
the TDC only option by clicking on
the corresponding button.
Click on the Configure button
Problem:
The
first line (events) in the first table (bunch counter) contains zeros
Cause:
Reset
has not been done properly
Solution:
Do
the test a second time
Problem:
The
test fails for a TRB-PHI: the green light stays OFF
Cause:
The
PN1 jumper has not been soldered during assembly: the jumper is open instead of
being closed for the S- and S0 MC types
Solution:
Close
the jumper PN1 by soldering it
NB:
this test must be done after the TRB emulator test since it needs to have all
BTIs properly configured. If the test has to be repeated, remember to run the
TRB emulator test before.
Problem:
The
test fails giving errors for a given TRB and BTI’s
Causes:
The
BTIs might be wrongly configured.
OR
The
voltage might be insufficient since the signals are sent to all the boards at
the same time.
OR
The
corresponding TRB is defective
Solutions:
1-
Reconfigure the BTI’s
Go
to the Start up page.
Click
on the Configure MC button.
Select
the BTI only option by clicking on
the corresponding button.
Click
on the Configure button
2-
If that does not work: increase slightly the 5V
3-
If nothing works, replace the corresponding TRB
Problem:
The
test dead channel is not OK: some channels are below the number of triggers.
In
RESULTS some green lights (group of 16: cell of 4x4) are off. For the MB3 MCs:
the last group has only 8 lights (half board).
Cause:
A
TP cable is defective
Solution:
Identify
the TP cable, remove it and redo the test without the cable. If the cable has
been correctly identified, replace it !
Test
the defective cable with an ohmmeter to check if it is really broken.
Problem:
The
test fails.
Cause:
The
PU clock delay has not been set correctly
Solution:
Go
to the Minicrate Test/ calibration panel
Click
on the PU timing test button
Activate
the window and click on the Change PU
button.
Put
the value identified during the pre-dressing tests.