HP 5890 SERIES II Service Manual page 289

When disconnecting a plug, pull on the plug not on its wires. Pulling on the wires may
cause breakage.
9. Disconnect push- on type connectors J1, J2, J3, and J4 (from blade connectors P1, P2, P3,
and P4, respectively) by grasping each one and pulling it straight off of its terminal.
10. Disconnect connectors J26, J27, and J28 from their respective receptacles. (Remove each one
by squeezing its ribbed sides while simultaneously pulling it out of the receptacle.)
11. Use a 7mm nut driver to loosen, but not remove, the mounting nut corresponding to the mount-
ing slot at the left edge of the AC power supply PCB mounting bracket, alongside the power
transformer.
12. Use the nut driver to remove the two mounting nuts at the right edge of the AC power supply
PCB mounting bracket.
The AC power supply PCB, and its associated mounting bracket, are removed and
replaced as a unit.
13. Lift the PCB bracket at its right edge while sliding it to the right to remove it from the instrument.
MOUNTING
SLOT
14. Install the replacement AC power supply PCB in the reverse manner by sliding the mounting
slot on the left side of the PCB mounting bracket under the loosened mounting screw adjacent
to the transformer.
15. Install the two mounting nuts at the right edge of the AC power supply PCB mounting bracket.
16. Tighten the two mounting nuts and the mounting screw firmly.
17. Install connectors J26, J27, and J28 into their respective receptacles, pushing each straight
down until fully bottomed.
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NOTE
J26
P4
Oven
P3
J27
R2
F2
J28
6A
F1
R1
120 Vac Single Phase AC Board
SVC 11- 3
R3
MOUNTING
HOLES
P1 WHT
20A
Blk
P2