Chapter 5 Service Instructions
Revision W HF Series X-ray Generators - Service Manual
5-86 Quantum Medical Imaging, LLC
Stored Energy Systems Line Monitor/Charger Board (AY40-
028T) A8 Replacement
CAUTION! The Line Monitor Board contains elec-
trostatic sensitive devices. Observe proper
grounding precautions before handling the Line
Monitor Board or any other circuit board.
1. On the replacement Line Monitor/Charger Board A8, verify all
jumpers are set to same configuration as removed Line Monitor/
Charger Board.
2. Place new Line Monitor/Charger Board A8 on standoffs in PCB
Door and secure using four (4) hex nuts.
3. Reinsert connectors A8P2 through A8P7 into their corresponding
jacks A8P2 through A8P7, leaving A8P1 disconnected from A8J1.
Remove tags.
4. Pre-adjust potentiometers A8R70 and A8R66 by rotating them
fully counterclockwise.
5. Restore the battery circuits by closing the F1 and F2 fuse holders
on the two battery trays.
6. Turn the generator ON. Verify that 220VAC (±10%) exists
between A8P1-4 and A8J1-7. If these voltages are out of range,
test the incoming AC line and confirm the correct taps have been
selected at TB1.
7. Once correct, turn OFF the generator and re-attach A8P1 to A8J1.
8. Turn the generator ON. Measure the following A8 test points
using a DVM and A8TP13 as ground. Verify these nominal values
are within ±5%:
• A8TP11 = +24VDC
• A8TP12 = +15VDC
• A8TP14 = -15VDC
• A8TP15 = +283VDC
• A8TP16 = -283VDC
9. Over-voltage Fault Threshold Calibration
- Using A8TP13 as a
ground:
a. monitor A8TP21 and adjust A8R19 to measure +2.12VDC
(±0.02 VDC).
b. monitor A8TP20 and adjust A8R60 to measure +2.12VDC
(±0.02 VDC).
10. Charger Voltage Limiter Calibration
- Using A8TP13 as a ground:
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