Electronics Module - Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual

Electronics Module

Most of the electronics in the MSD are contained in the electronics module.
The whole electronics module can be replaced, if necessary, by your Agilent
Technologies service representative.
The electronics module contains:
• Main board
• Signal amplifier board
• LAN/MS control card
• AC board (power distribution / vacuum control board)
• Low voltage (AC-DC) power supply
• High voltage (HED) power supply
• Toroid transformer assembly
Main board
The main board is mounted on the outer side of the electronics module. The
main board performs these functions:
• Receives and decodes digital instructions from the LAN/MS control card.
• Sends digital information to the LAN/MS control card.
• Generates voltages for the ion source lenses.
• Generates control signals for filament selection, filament emission current,
• Performs analog-to-digital conversion for the Direct signal, ion source and
• Monitors the signals from the vacuum system and fans and the filament
• Generates the control signals (on and off) used by the AC board for the high
• Generates ±280 VDC (nominal) power for main board lens amplifiers and
5975 Series MSD Troubleshooting and Maintenance Manual
and electron energy. Generates control signals for quadrupole RF drive,
quad frequency adjustment, DC polarity selection, and all detector voltages.
mass filter temperature signals, and foreline pressure or turbo pump speed
signal.
status, HV fault and RF fault signals from the side board. Activates the
shutdown line when the analyzer electronics must be disabled.
vacuum pump and calibration valve.
side board DC amplifiers.
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Electronics
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