Chapter 5 Service Instructions
Revision W HF Series X-ray Generators - Service Manual
5-92 Quantum Medical Imaging, LLC
6. Adjust potentiometer A20R48 to 2.8 - 3.0 VDC for systems
equipped with Toshiba E7183X and E7252X tubes, and 4.4 - 4.6
VDC for all other tube types.
Q-HSS Equipped Systems Only: High-Speed Starter Driver Board
A20A2 (P/N AY40-036S) Removal
CAUTION! The High-Speed Starter Driver Board
contains electrostatic sensitive devices. Observe
proper grounding precautions before handling the
High-Speed Starter Driver Board or any other cir-
cuit board.
1. Set the power on/standby switch on the Operator Control Panel
(OCP) to the standby ( ) position.
2. Set the ON/OFF circuit breaker CB1 on the generator cabinet to
OFF position.
WARNING! To prevent electrical shock hazards,
make sure power is off and capacitors are dis-
charged before proceeding with any removal/
replacement procedures.
3. Verify capacitors A20A2C4, A20A2C5, A20A2C8, and A20A2C9 are
fully discharged - wait at least seven minutes, then measure the
voltage across A20A1TP19 and A20A1TP20 and verify it is less
than 30 VDC before proceeding.
4. Remove three (3) 6-32 hex nuts securing the clear plastic high-
voltage shield to the PCB Door standoffs and remove shield.
5. Tag and remove all cables connected to High-Speed Starter Driver
Board A20A2.
6. Remove four (4) screws securing High-Speed Starter Driver Board
A20A2 to the front panel and carefully remove High-Speed Starter
Driver Board.
Q-HSS Equipped Systems Only: High-Speed Starter Driver Board
A20A2 (P/N AY40-036S) Replacement
CAUTION! The High-Speed Starter Driver Board
contains electrostatic sensitive devices. Observe
proper grounding precautions before handling the
High-Speed Starter Driver Board or any other cir-
cuit board.
CAUTION! To prevent damage, do not handle
High-Speed Starter Driver Board by grasping or
touching the heat sinks.
1. On replacement High-Speed Starter Driver Board A20A2, verify
jumper JP1 is installed.
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