HP 5890 SERIES II Service Manual page 166

HEATER
STANDOFFS
FAN SHROUD (AS VIEWED FROM INSIDE OVEN)
WHEN DISCONNECTING A PLUG, PULL ON THE PLUG NOT ON ITS WIRES. PULLING
ON THE WIRES MAY CAUSE BREAKAGE.
14. At the rear of the instrument, disconnect the two heater element leads at the AC power supply
PCB.
15. From inside the oven, draw the heater leads through the opening in the rear of the oven.
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FAN SHROUD
Fan Shroud
HEATER ELEMENT
CONNECTION TERMINALS
SVC 5- 4
SENSOR
SCREWS