ARES MB FLAT PANEL :

INVERTER KV ERROR
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a) High voltage circuit in the monobloc is unbalanced or kV feed-back is not present during an exposure or it is out of range. The yellow B11-Ld1 led is ON.
b) During x-ray emission, kV decrease under 75% in respect of the set value (during the emission the led B11-Ld5 turns OFF).
c) During X-ray emission, kV increase over 110% of set value (software control on TUBE KV analog signal).
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Perform an exposure and check on the Inverter B11 board the following:
- KV FEED signal (1V = 20kV)
- the KV+ and kV- signals must be balanced
- kV>75% signal
- TUBE KV signal (1V = 20kV)
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B11-Tp1
B11-Tp5 and Tp6
B11-Ld5ON
B2-Tp6
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INVERTER OVERLOAD
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The current absorbed by the Inverter is too high.
The red B11-Ld2 led is ON (Ipk>300A).
Monobloc fault or too high anodical current.
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In preparation phase check on B7 board the following signals:
- FIL DAC OUT
- mA SET
- FIL CUR
in radiography phase
- ANODIC mA
- mA STABILIZATION
The replacement of the monobloc could be necessary.
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B7-Tp3
B7-Tp1 (1V=20mA)
B7-Tp8 (1V=100mA)
B11-Tp8 (1V=20mA)
B2-Ld26
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INVERTER FAULT
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Error in the driver of the IGBTs.
The red B11-Ld3-4 led is ON.
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Perform an exposure. Replace the Inverter if the fault persists.
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