GE Logiq 9 Service Manual

GE MEDICAL SYSTEMS PROPRIETARY TO GE
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IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-1
Chapter 5
Components and Functions (Theory)
Section 5-1
Overview
5-1-1 Purpose of Chapter 5
This chapter explains LOGIQ™ 9’s system concepts, component arrangement, and subsystem 
function. It also describes the Power Distribution System (PDS) and probes.
 
Table 5-1 Contents in Chapter 5
SectionDescriptionPage Number
5-1
Overview5-1
5-2
General...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-2 Section 5-2 - General Information
Section 5-2
General Information
LOGIQ™ 9 is a phased and linear array ultrasound imaging scanner. It has provisions for analog input 
sources like ECG and Phono. A Doppler probe may also be connected and used. 
The system can be used for: 
- 2D Gray Scale and 2D Color Flow Imaging 
- M-Mode Gray Scale Imaging 
- Color M-Mode 
- Doppler
- Different combinations of the...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-3
5-2-1 Block Diagram
Figure 5-2   LOGIQ™ 9 Simple Block Diagram
FRONT END PROCESSOR
PROBES
FRONTPLANE
FRONT END BACKPLANE DOPPLER
ATX POWER SUPPLYUPS
AC POWER
OP I/O PA N EL17 Monitor
USER INTERFACE
SONY COLOR PRINTERUP-2900MDPC2IO
PCVIC
PC MOTHERBOARD
POWER ON/OFF (RESET*)
FLOCK
OF
BIRDS
(optional)Ethernet
PC2IP SOUND
CARD PCI
VIDEO AGP
VIDEO
XDI
FR
F
AMP...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-4 Section 5-2 - General Information
5-2-2 Dataflow Control Description
5-2-2-1 Data Sets
Each scan mode will produce data to a corresponding data set in the Image Memory. The data sets are 
represented in ring-buffers. Each active data set will be allocated to one of the following types of 
acquisition data:
• 2-D tissue data
• Doppler data
• M-mode data
• 2-D Color flow 
• Trace data
• Video...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-5
Section 5-3
Front End Processor
The Front End Processor generates the strong bursts transmitted by the probes as ultrasound into the 
body. It also receives weak ultrasound echoes from blood cells and body structure, amplifies these 
signals and converts them to a digital signal.
5-3-1 Front End Processor Power Supply Board (FEPS, FEPS2, FEPS2.1)
The power...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-6 Section 5-3 - Front End Processor
5-3-1Front End Processor Power Supply Board (FEPS, FEPS2, FEPS2.1) (cont’d)
The high voltage lockout circuit monitors the +5VA, -5VA, +12VA and 3V3 supplies and locks out the 
PHVP supply in the event that any one of them go below 10% of their nominal value.
PWR_OK is an active high TTL compatible output which provides a status indication of the AC input 
power. It...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-7
5-3-2-1 XDIF (Transducer Interface) Board
The XDIF supports four 128 Channel probe ports with the ability to select one of the four probe ports. 
The XDIF supports a probe multiplexer requiring a 200V (+100V and -100V). The multiplexer in the 
probe will select 128 of the out of up to 192 channels.
The XDIF uses a T/R (Transmit/Receive) switch on each output...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-8 Section 5-3 - Front End Processor
5-3-2-3 RF Amp, RF Amp1.2, RF Amp2 Board (Radio Frequency Amplifier Board
The RF Amplifier board shall contain 128 channels of the circuitry that is necessary to amplify the small 
electronic echo signals that are received from the probe transducers. Each channel shall consist of a 
low-noise, active input termination preamplifier, a time-gain compensation (TGC)...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-9
5-3-2-4 TD, TD4, TD5 (Time Delay) Boards (8)
Major functions of the TD boards are:
- Transmitter
- Analog Receive
- A/D (Analog to Digital conversion)
- Digital Receiver (Rigel Beamformer Chip)
- Control & Timing
The TD (Time Delay) boards send 128 transmit signals to the XDIF board. The 128 receive channels 
from the RF board get low pas filtered, converted...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-10 Section 5-3 - Front End Processor
5-3-2-4TD, TD4, TD5 (Time Delay) Boards (8) (cont’d)
Major control siganal from the EQ board are the Digital TGC/VREF and Serial Control Bus (I
2C). Control 
signal between the Scan Control board consist of Power, Timing Clocks, TD Control Bus and Fault 
Interrupts
Time Delay (TD, TD4, TD5) Board Function Summary:
• Each board assigned to a subset of 16 channels.
•...