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Functional Description
Mass Spectrometer
Thermo Scientific TSQ Series Hardware Manual 43
Electronic Assemblies
The electronic assemblies that control the operation of the mass spectrometer are distributed
among various PCBs and other modules located in the tower, in the embedded computer, and
on or around the vacuum manifold of the mass spectrometer.
The Power Entry Module provides mass spectrometer power control, a contact closure
interface, vent valve control, an Ethernet 100 base-T connection from the System Control
PCB to the data system PC, a mechanical pump failure protection circuit (linked to vent valve
control), a system reset button, status LEDs, and service ports. The right-side power panel,
shown in Figure 13 on page 21, is part of the Power Entry Module.
The Power Entry Module accepts line power, filters it, and provides it to various components
of the mass spectrometer. The Power Module includes the following components:
• Main power circuit breaker switch
• Surge suppressor
• Line filter
• Electronics service switch
• Vacuum service switch
The “brains” of the TSQ mass spectrometer is the System Control PCB. The System Control
PCB and embedded computer include the following:
• PowerPC processor
• Serial Peripheral Interconnect (SPI) bus
• I/O coprocessor
• Super Harvard Architecture Computer (Sharc) bus
• Scan generator DSP
• Acquisition processor DSP
• Interbus bridge
• 100 base-T Ethernet port
The rf voltage generation electronic assemblies produce the S-lens (TSQ Vantage mass
spectrometer only), Q00, Q0, Q1, Q2, and Q3 rf voltages that enable ion transmission and
mass analysis. The Analyzer Control PCB and the System Control PCB control all rf voltages.
The Q1 and Q3 rf voltage amplifier circuits are identical, and the circuits for Q0 and Q2 are
similar.
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