HP 5890 SERIES II Service Manual page 269

7. Disconnect any signal cables installed at the connectors on the top of the main PCB.
The following steps require protection against ESD (Electro- Static Discharge).
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Use a grounded wrist strap (part no. 9300- 0969 - large, or 9300- 0970 - small)
connected to a suitable ground. Failure to heed this caution may result in
damage to the instrument.
When storing or in between handling of PCBs (Printed Circuit Boards), always
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place them in static control envelopes or enclosures.
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SVC 9- 3
SIGNAL CABLE
CONNECTORS