9600 Service Manual - gmecorp-usa.com

Interlocks / Stator 5
+24V INTERLOCK
The +24V_INTERLOCK signal passes through the Battery Charger PCB to the X-ray
Regulator PCB where it turns on transistor Q1. When Q1 turns on, the signal INTLK goes
low. The logic low INTLK signal goes through the Motherboard to the Analog Interface
PCB where it passes through buffer U45 pins 13 & 7 to PIO U27-11. The PIO U27 passes
the logic low INTLK signal to the Technique Processor via the data bus. This informs the
Technique Processor that the interlock circuit is complete.
In addition, the +24V_INTERLOCK supplies power to other relays in various circuits as
listed below.
• Relay K2 - The HVDRA & HVDRB safety relay in the kV circuit on the Generator
Driver PCB
• Relay K1 - The filament select relay in the mA circuit on the Generator Driver PCB.
• Relays K1 & K2 - The pre-charge relays.
INTERLOCK FAULT CONDITIONS
DURING THE SYSTEM BOOT SEQUENCE
The system will hang with 18 arrows on the Control Panel display if the Technique
Processor PCB does not receive the logic low INTLK signal indicating a successful
interlock complete.
AFTER A SUCCESSFUL SYSTEM BOOT
INTERLOCKS OPEN - This message will appear on the Control Panel display if there is a
failure in the interlock circuit that causes the INTLK signal to the Technique Processor
PCB to go high. This is a fatal error that prevents X-rays and motor movements. This
message will also occur if one of the FAST STOP switches is pressed. The system is still
powered at this time and a system re-boot can be commanded by pressing any key on the
control panel.