Removing The Front Panel Subassemblies - HP 8114A Service Manual

HP 8114A Service Guide

Removing the Front Panel Subassemblies

Disassemble the Front Panel until you reach the subassembly you
want to replace, as follows:
1. Ribbon-cable connecting the Front Panel to the Motherboard
a. Disconnect the Ribbon cable from 54
b. Remove the Ribbon cable
2. Ribbon-cable connecting the RPG module to the Display module
a. Disconnect one end from J 1 on the RPG module
b. Disconnect the other end from CN2 on the Display module
c. Remove the Ribbon cable
3. Display module
a. Disconnect from CNl, the cable coming from the RPG module
b. Release the module from its plastic support clips (see "How to
Remove PC Boards from Plastic Support Clips")
c. Remove the Display module
4. RPG module
a. If not already done, disconnect and remove Ribbon cables
connected to 54 and Jl
b. If not already done, disconnect the cable going from the RPG
module to CNl on the Display module
c. Disconnect the Ribbon cable from 53. This cable connects to
the Head unit and is folded under the RPG module and trapped
there to accommodate the length of the Ribbon cable
d. Slide the cover of 52 toward the large Key pad to release the
flexible connector, and remove the connector from 52
e. Release the module from its plastic support clips (see "How to
Remove PC Boards from Plastic Support Clips")
f. Remove the RPG module
5. RPG knob
a. Using gentle, steady pressure, pull the knob off the RPG Head
unit shaft. There are no retaining screws
6. RPG Head unit
a. Using a 12mm nut driver, remove
Head unit to the Front Panel
b. Remove the washer
7. Key pad retaining panels The 2 Keypad securing panels are
removed by the same method:
a. Release the panel from its plastic support clips and locating
posts (see "How to Remove PC Boards from Plastic Support
Clips")
the
nut that secures the RPG