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PCB EXPLANATION
ＭＵＸ-１００ SERVICEMANUAL ５ - ３
5-2 X CONT-2002 PCB
Function
This PCB equipped with the following circuits performs general control.
1. I/O circuit, A/D circuit and D/A circuit to transfer data to NEXSC PCB
2. Circuits to detect and feed back TKV and TMA
3. TKV OVER detection circuit (X-ray tube discharge detection circuit)
4. System timer circuit (X-ray cutoff signal)
5. IGBT drive control circuit
6. Filament heating FET drive control circuit
7. Dynamic display control circuit, sheet key input circuit and sheet key search circuit
8. -15V detection circuit
9. Power ON reset circuit (master reset signal)
10. Charging control
11. Interface circuit with each PCBs
During PCB replacement
The VR1 (mAs), the VR2 (VFADJ) and the VR3 (PULSEADJ) should be adjusted.
Refer to “Appendix C.3 X CONT-2002 Adjustment Method” in Installation Manual.
As well, confirm the detected battery charged voltage referring to “6-2-3 Confirmation of battery voltage detection”.
LED list
LED No. Signal Name Description
LD1 KEY IN Lights when an input is given from the panel.
LD2 AR
Lights when the READY switch or the first
step of the hand switch is pressed.
LD3 HX
Lights when the X-RAY switch or the
second step of the hand switch is pressed.
LD4 CHON-O Lights during charging.
VR list
VR No. VR Name Description
VR1 mAs Adjusts the mAs clock.
VR2 VFADJ Adjusts the inverter working frequency.
VR3 PULSE ADJ Adjusts the IGBT gate pulse.
Check pin list
CP No. CP Name Description
CP1 +5V +5V
CP2 GND GND
CP3 CHECK1
CP4 CHECK2
To be short-circuited during adjustment. Short-circuit them first, then turn on the
power. Short-circuiting them in the power ON status is invalid.
Refer to Appendix C in the Installation Manual.
CP5 VSIN
15V input during adjustment.
Refer to Appendix C in the Installation Manual.
CP6 IFST Filament heating voltage signal (after correction)
CP7 IFV Measured filament current (1V/1A)
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