Chapter 5 Service Instructions
Revision W HF Series X-ray Generators - Service Manual
5-48 Quantum Medical Imaging, LLC
Optional +28 VDC Power Supply Troubleshooting
The following steps apply only to systems equipped with the internally-
mounted +28 VDC Power Supply Option (QG-28VPS). The QG-28VPS pro-
vides a regulated +28 VDC output source to power peripheral x-ray
equipment such as tube stands, wall stands, etc. If a problem with the
power supply is suspected, proceed as follows:
1. Disconnect Power Supply QG-28VPS output wires at pins P2-1
and P2-2.
2. With the generator power turned on, measure the DC output
across Power Supply QG-28VPS pins P2-1 and P2-2. It should
measure between +26.5 and +27.5 VDC on systems intended for
use with Quantum QW-420-T/-D wall stand, and between +29.5
and +30.5 VDC on systems intended for use with RS-580 Over-
head Tube Crane. Adjust voltage output if necessary using
potentiometer on power supply.
3. If no output exists at terminals P2-1 and P2-2, verify 220 VAC
input to power supply at terminals P1-L and P1-N. If 220 VAC is
present, replace power supply.
4. If no 220 VAC at power supply input, check for open Fuse F7 on
Interface Board A9 (AY40-061T used on non-digital systems/
AY40-062T used on digital systems).
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