Siemens MOBILETT Plus HP Service Instructions Manual page 17

Display messages
Dis-
played
messages
CAL 7
Err 9
* See section "Monitoring the kV and mA values"
** Wiring diagram X037E
Tab. 1
Siemens AG
Medical Solutions
Mode of
Cause
operation
During The exposure time
exposure has reached its max-
imum value.
During When measuring the
exposure kV value, a large
high tension asym-
metry is detected.
SPR8-220.061.03
Rev. 03
Possible reasons and advice
The maximum exposure time is 4 s.
•
The exposure is normally
interrupted earlier by "Err 5".
•
Check the capacitance in the
capacitor bank (see section "P03 -
Capacitor bank and charging test").
•
Check the filament heating (see
section "P01 - Filament test").
•
Check the tube current in
measuring point "MAPOS" on D1
(see pages 140 and 141).
•
Check the current to the single tank
(see section "Error diagnosis HT
and single tank").
Normally the kV value is symmetric
around ground. The acceptable devi-
ation is ± 19.5 kV. This corresponds
to HTD 2.5 V± 0.5 V.
•
Intermittent measurement cables
or defective single tank.
•
Check the measurement cable K9
between D1 and the single tank
(see page 140**).
•
Check the current to the single tank
(see section "Error diagnosis HT
and single tank").
•
Measure the HTD signal on D1 and
compare it with notes and curves
on page 140 and 141**.
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MOBILETT Plus HP