Service manual

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION , REVISION
5-16 Section 5-6 - Circuit Boards Descriptions
• Power Supply for Mux
- Supply/Cut control:
+5V and +12V on a connector are supplied while a probe is connected to the connector.
+/-SHV are supplied only while a probe is selected.
• Surface temperature
- Detects resistance of a thermistor in a probe head as voltage when the probe is
selected.(PTEMP) This signal is connected to FEC.
• LED Blinking
- The LED in a probe glows when the probe is selected. (Only on Selected probe which have
LED’s)
IIC bus
- Connects signals of IIC bus with a relay when IIC bus access is required.
- Selects one of two probes that IIC access with 2-to-1 switch.
- Board Rev, Board No., Part No., are stored in EEPROM and sent to FEC through IIC Bus.
5-6-1-2 Transmit Board
Overview
The TXB Assy (Transmit Board) is designed for LOGIQ™ 3 system transmitter. This Assy has bipolar
drivers, transmit pulse generator ASIC and so on.
Figure 5-12 Transmit Board Block Diagram
TPG2
FPGA
Config
ROM
B
U
F
USC Interface (From FEC)
Control And Data bus
TPG2
TPG2
Clock
DRV
ECL
to TTL
Transmit Drivers
Transmit Drivers
Transmit Drivers
16
16
16
48
48
48
HV
Discharge
HV Supply
48
CON/RX Board
EEPROM
IIC Bus