General Maintenance 4
5977B Series MSD Troubleshooting and Maintenance Manual 141
Maintaining the Electronics
Scheduled maintenance
None of the electronic components of the MSD need to be replaced on a
regular schedule. None of the electronic components in the MSD need to be
adjusted or calibrated on a regular schedule. Avoid unnecessary handling of
the MSD electronics.
Electronic components
Very few of the electronic components are operator serviceable. The primary
fuses can be replaced by the operator. The RF coils can be adjusted by the
operator. All other maintenance of the electronics should be performed by
your Agilent Technologies service representative.
Electrostatic precautions
All of the printed circuit boards in the MSD contain components that can be
damaged by electrostatic discharge (ESD). Do not handle or touch these
boards unless absolutely necessary. In addition, wires, contacts, and cables
can conduct ESD to the printed circuit boards to which they are connected.
This is especially true of the mass filter (quadrupole) contact wires which can
carry ESD to sensitive components on the side board. ESD damage may not
cause immediate failure, but it will gradually degrade the performance and
stability of your MSD.
When you work on or near printed circuit boards, or when you work on
components with wires, contacts, or cables connected to printed circuit
boards, always use a grounded antistatic wrist strap and take other antistatic
Improper use of these procedures could create a serious safety hazard. Improper use
of these procedures could also result in serious damage to, or incorrect operation of,
the MSD.
Vent the MSD and disconnect its power cord before performing any of these
procedures except adjusting the RF coils.
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