HP 5890 SERIES II Service Manual page 278

Replace Rear Panel Connector PCB and/or Cable for DICE PCB
HAZARDOUS VOLTAGES ARE PRESENT IN
THE INSTRUMENT WHEN THE POWER CORD
IS CONNECTED.
DANGEROUS
DISCONNECTING
BEFORE WORKING ON THE INSTRUMENT.
1. Set the main power line switch to the off position.
2. Disconnect the power cable from its receptacle.
3. Allow time for the oven and heated zones to cool.
4. When the heated zones are cool, turn off all gas
supplies.
5. If the rear panel connector PCB ribbon cable is
to be replaced, remove the electronics carrier
top cover by grasping it at the rear and lifting
upwards until its catch releases, then pulling it
towards the rear of the instrument.
6. If the rear panel connector PCB ribbon cable is to be replaced, remove the right side panel by
removing four screws: two each along its upper and lower edges.
7. Remove the four screws securing the rear pan-
el to the instrument.
8. If the rear panel connector PCB is to be re-
placed, remove the three screws securing the
rear panel connector PCB to the rear panel.
This procedure requires precautions against
ESD (Electro- Static Discharge).
grounded wrist strap (part no. 9300- 0969 -
large, or 9300- 0970 - small) connected to a
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AVOID A POTENTIALLY
SHOCK HAZARD
THE POWER CORD
ELECTRONICS
CARRIER TOP
COVER
Use a
SVC 10- 5
BY
REAR PANEL
CONNECTOR
PCB
RED O VISIBLE
OFF ON
SCREWS
RIGHT SIDE
PANEL
SCREWS