mA Generation
High Voltage Tank
K4 Relay
Large Filament
Small Filament
FILDRA
FILDRB
Fil_Select
Fil_B_Sen_DIV
Fil Reg Base
Filament Driver PCB
HI_MA_SEN
HI_MA_SEN_REF
LO_MA_SEN
LO_MA_SEN REF
High Voltage Supply
Regulator PCB
FILDRA
FILDRB
Fil_Select
Fil_B_Sens
Fil_B_Sens_Ref
Fil Reg Base
Fil_Drv_OK*
Generator Driver PCB
FILDRA
FILDRB
Fil_Select
Fil B Cntrl
Fil_Error
Fil_Drv_Ret
Fil_B_Sens_Ref
X-ray Controller PCB
LO_MA_SEN_NEG
HI_MA_SEN_NEG
HI_MA_SEN_POS
LO_MA_SEN POS
(To X-ray tube)
ANODE
CATHODE
Large Filament
Small Filament
mA Generation
The FIL_ERROR voltage is actively controlled by the microprocessor on the X-Ray Controller PCB to adjust the filament voltage
controlling the actual tube mA during a shot. The pulse width does not change. The small feedback loop change provides a
safeguard to the x-ray tube and guards against improper operation that could result in an x-ray hazard.
The circuitry on the Generator Driver PCB monitors the filament current and pulls a control voltage low if the filament current
exceeds the sleep mode value. Absence of either drive will reduce filament current to a very low value. This prevents generation
of X-rays by turning off the kVp drive at the High Voltage Supply Regulator PCB, with the signal FIL_DRV_OK*. When a shot has
to be made after the generator has been in sleep mode, a delay is necessary to allow the filament to warm up to the correct
temperature.
3
Service
Periodic Maintenance
Contents
Schematics
Illustrated Parts
Installation
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