Electronics 8
5977B Series MSD Troubleshooting and Maintenance Manual 215
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
• Lens driver board for HES
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,
and electron energy. Generates control signals for quadrupole RF drive,
quad frequency adjustment, DC polarity selection, and all detector voltages.
• Performs analog-to-digital conversion for the Direct signal, ion source and
mass filter temperature signals, and foreline pressure or turbo pump speed
signal.
• Monitors the signals from the vacuum system and fans and the filament
status, HV fault and RF fault signals from the side board. Activates the
shutdown line when the analyzer electronics must be disabled.
• Generates the control signals (on and off) used by the AC board for the high
vacuum pump and calibration valve.
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