HP 5216A Transformer Cover Replacement
I removed the rear transfomer cover from my HP 5216A frequency
counter. Don't do what I did. Don't remove the two screws on the
rear panel transformer cover.
But if you do, here is the replacement procedure, in 15 easy
steps:
- Facing rear of unit, remove right cover, exposing crystal
reference and power supply board.
- Remove bottom cover (two screws in back bottom).
- Remove 2 screws holding crystal board bracket. Do not remove
crystal board itself from bracket. Position assembly safely out of
the way.
- Detach power supply board from edge connector.
- Remove two screws (tapered) in power supply board and detach
from transformer insulation shell. Protect against transformer
dropping or pulling out its delicate wires.
- Remove power supply board and set it and two screws aside.
- Fish for #6 nuts inside transformer plastic cover.
- Push transformer through back cover hole in correct
orientation.
- Replace rear transformer cover. Put long screws with star
washers back through holes and flush with plastic case.
- Use fingers to position hex nuts.
- Tighten screws, attaching transformer and its cover to plastic
case.
- Re-attach power supply board to its edge connector by using
left hand on top and right hand through side.
- Position power supply board over plastic transformer cover and
align screw holes.
- Using right angle or short screwdriver, re-attach power supply
board to transformer plastic cover with two screw.
- Replace crystal board. See See
http://www.prc68.com/I/Images/5216Rs.jpg for proper
positioning.
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