Chapter 5 Service Instructions
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC
5-77
Power Modules A18 and A19 (P/N AY20-047) Replacement
1. Replace Power Module A18 as follows:
a. Install Power Module A18 by securing it to the back of the
Generator Chassis using six (6) 8-32 x 1/4" screws.
b. Remove tags and connect the red cable to IGBT (+) terminals
and the black cable to IGBT (-) terminal on Power Module
A18.
c. Connect two black jumper wires between Power Module A18
IGBT terminal and the left side lug of resonant capacitor C4.
d. Connect the IGBT Driver Cable (P/N AY51-015) plug A18A3P5
to IGBT Drive Board A18A3 (P/N AY40-010T) connector J5.
e. Connect H.V. Tank cable terminal PA2 to Power Module A18
lower left IGBT terminal.
2. Replace Power Module A19 as follows:
a. Install Power Module A19 by securing it to the back of the
Generator Chassis using six (6) 8-32 x 1/4" screws.
b. Remove tags and connect the red cable to IGBT (+) terminals
and the black cable to IGBT (-) terminal on Power Module
A19.
c. Connect two black jumper wires between Power Module A19
IGBT terminal and the right side lug of resonant capacitor C7.
d. Connect the IGBT Driver Cable (P/N AY51-023) plug A19A3P5
to IGBT Drive Board A19A3 (P/N AY40-010T) connector J5.
e. Connect H.V. Tank cable terminal PC1 to Power Module A19
lower right IGBT terminal.
3. Re-install the clear plastic high-voltage protection panel on the
Generator Chassis and re-tighten four (4) mounting screws.
4. Set the ON/OFF circuit breaker CB1 on the generator cabinet to
ON position.
5. Set the power on/standby switch on the Operator Control Panel
(OCP) to the on ( ) position.
6. Connect a DVM between the red and black cables on the IGBT
and check that the voltage is between 380 VDC and 420 VDC.
7. Set the power on/standby switch on the Operator Control Panel
(OCP) to the standby ( ) position.
8. Set the ON/OFF circuit breaker CB1 on the generator cabinet to
OFF position.
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