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Section F
3.23.KV OUT OF RANGE
The kV feedback from the tubehead is monitored by a comparator
circuit on the converter board PQ1 and its output is connected to
the interrupt line of the microcontroller.
When the value of the kV feedback signal is outside the set operating
range (nominal value ± 3kV), the microcontroller disables the
converter electronics and communicates the alarm to the host board
PC1; in consequence of that, the X-ray emission is stop by
disactivating the START_XRAY line. It waits for a reset before
starting a new exposure sequence.
If the kV generated are really too high (more than 90) also the alarm
Over kV may be generated.
The kV feedback signal can be monitored with a multimeter
connected on TP13 and TP8 (GND) on the converter board PQ1
(see Section D for more details).
Possible cause:
(1)
converter board PQ1 defective.
(2)
tubehead defective.
(3)
wiring between converter board PQ1 and tubehead
defective.
W
I
t f
e h
o c
n
e v
t r
r e
b
o
a
d r
P
Q
1
p
o r
g
a r
m
s
T
b u
e
a c
b i l
a r
o i t
n
a
(
e s
e
t
e h
e r
e l
a v
n
p t
a
a r
g
a r
p
s h
The alarm is captured and stored as soon as it as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm.
3.24.mA OUT OF RANGE
The mA feedback coming from the tubehead is monitored by a
comparator circuit on the converter board PQ1 and its output is
connected to the interrupt line of the microcontroller.
When the value of the mA feedback signal is outside the set
operating range (nominal value ± 5%), the microcontroller disables
the converter electronics and communicates the alarm to the host
board PC1; in consequence of that, the X-ray emission is stop by
disactivating the START_XRAY line. It waits for a reset before
starting a new exposure sequence.
The mA feedback signal can be monitored with a multimeter
connected on TP16 and TP8 (GND) on the converter board PQ1
(see Section D for more details).
Possible causes:
(1)
fuse F5 blown on the converter board PQ1
(2)
converter board PQ1 defective.
(3)
tubehead defective.
(4)
wiring between converter board PQ1 and tubehead
defective.
W
f I
h t
e
c
o
n
v
e
t r
r e
b
o
a
d r
P
Q
1
p
o r
g
a r
m
s
T
u
b
e
c
a
i l
r b
t a
o i
n
a
s (
e
e
h t
e
e r
e l
v
a
t n
p
a
a r
g
a r
p
h
s
The alarm is captured and stored as soon as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm.
F-10
A
R
N
N I
G
e n
e
s d
o t
b
e
e r
p
a l
e c
d
t ,
e h
d n
V
t f
b u
e
e
d
i t i
g n
m
s u
b t
e
p
e
f o
h t
s i
s
c e
o i t
f n
r o
m
o
e r
f n i
r o
A
R
N
N I
G
n
e
e
d
s
o t
b
e
e r
p
a l
c
e
, d
h t
e
n
d
V
f
u t
b
e
e
d
t i
n i
g
m
u
t s
b
e
p
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f o
h t
s i
s
e
t c
o i
n
f
r o
m
o
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i
f n
r o
m
3.25. I CHP OUT RANGE
The current passing through the power transistors mounted on the
converter board PQ1 is measured by a Hall sensor, connected to
the microcontroller of the converter board itself.
When the current is outside the set operating range, the
microcontroller disables the converter electronics, and
communicates the alarm to the host board PC1; in consequence of
that, the X-ray emission is stop by disactivating the START_XRAY
line. It waits for a reset before starting a new exposure sequence.
If the current is really high, also the alarm Chp.over current may
be generated.
Possible causes:
(1)
converter board PQ1 defective.
(2)
tubehead defective.
I
t f
e h
o c
n
e v
p
o r
g
a r
m
s
T
b u
(
e s
e
t
e h
e r
e l
The alarm is captured and stored as soon as it as it is detected.
Press the RESET pushbutton on the control panel to cancel the
e s
i v r
e c
alarm.
f r
r o
m
e
d
m
a
o i t
n
. )
3.26. OVER KV
The kV feedback from the tubehead is monitored by a comparator
circuit on the converter board PQ1 and its output is connected to
the interrupt line of the microcontroller.
If the kV generated are more than 90, the microcontroller disables
the converter electronics and communicates the alarm to the host
board PC1; in consequence of that, the X-ray emission is stop by
disactivating the START_XRAY line. It waits for a reset before
starting a new exposure sequence.
The kV feedback signal can be monitored with a multimeter
connected on TP13 and TP8 (GND) on the converter board PQ1
(see Section D for more details).
Possible causes:
(1)
converter board PQ1 defective.
(2)
tubehead defective.
f I
h t
e
c
o
n
e v
p
o r
g
a r
m
s
T
b u
(
e s
e
t
e h
e r
e l
The alarm is captured and stored as soon as it as it is detected.
Press the RESET pushbutton on the control panel to cancel the
alarm.
s
e
v r
c i
e
f r
r o
m
e
d
t a
o i
n
. )
(03.0)E
ORTHORALIX 9200
W
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DENTSPLY Gendex
Service Manual
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