Job Card Diag A010 - No Lift Or Rotation Movement - GE Senographe DS Manual

GE Healthcare
Revision 1

Job Card DIAG A010 - No Lift or Rotation Movement

1 INTRODUCTION
This Job Card is intended as an aid to troubleshooting when no lift or rotation movement is possible.
1-1. Schematic Concept of the Components Surrounding the H-Bridge
The following diagram shows a schematic concept of the components which control the H-Bridge on the
Lift DC Board PL201 and the Rotation DC Board PL202. This diagram is intended to provide operational
concepts rather than an actual circuit diagram.
The layout of the Lift DC Board and the Rotation DC Board can be found in
Fuses on page 286.
The H-Bridge is a group of components which includes a motor in the center and a MOS switch on each
branch. The bold lines in the diagram below define the branches of the H-Bridge. The direction of the
motor is determined by the pair of MOS switches that are closed (i.e. c for clockwise and a for anticlock-
wise). Movement is achieved by applying 48 V DC to the motor.
When there is a lift or rotation movement request by an Operator of the Senographe system, the Micro-
processor does the following:
• gets the MOS Drive to close the appropriate pair of MOS switches on the H-Bridge (known as a
movement request)
• closes the MOS 48 V DC Switch to supply the H-Bridge with 48 V
The microprocessor controls the states of the DS4 and DS8 diodes on the Lift DC Board and the Rota-
tion DC Board. The states of the DS4 and DS8 diodes vary according to the different situations that can
exist, and are summarized in the following table.
If 48 V DC supply is ok
JC-DIAG-A-010.fm
DS4
DS8
MOS
Drive
Movement request
H-Bridge health
OK
OK
Faulty
Service Information and Procedures Class A 2385072-16-8EN
Job Card DIAG A010 - No Lift or Rotation Movement
+48 V
MOS 48 V DC Switch
a
c
Motor
c
a
+0 V
H-Bridge
Situation
Movement
Yes
No
No
Page no. 1005
Senographe DS
Chapter 9
Gantry Board Indicators and
Diode state
DS4 DS8
ON OFF
OFF ON
Initially ON ON
then OFF
Chapter 9