Removal And Replacement Of - HP 54501A Service Manual

6 .
Remove the two PCB (printed circuit board) retainers, securing Power Supply Assembly
from right front and rear corners of the instrument cabinet by pulling retainers up and out.
7 . Slide Power Supply Assembly out through side of instrument cabinet .
8. To replace Power Supply Assembly, reverse this procedure .
1 .
Disconnect power cable.
NOTE
When installing the Power Supply Assembly, make certain power supply
connectors are directed to inside of instrument.
6-20 . Removal and Replacement of Keyboard Assembly
2 .
Remove power supply by following the steps previously detailed in Removal and
Replacement of Power Supply Assembly.
3 .
Detach keyboard cable, W5, from System Board Asser;nbly .
HP 54501 A SERVICE
4 . Remove the four screws securing Keyboard Assembly to front of instrument cabinet .
5 .
The Keyboard Assembly (label overlay, housing, keypad, keyboard, RPG and knob) will
come off front panel as one unit.
6 .
To disassemble the Keyboard Assembly, follow these steps:
a.
Pull RPG knob to remove Keyboard Assembly from front panel .
b.
Elastomeric keypad is not attached to keyboard and may be lifted from assembly.
c. Pull to remove knob from Keyboard assembly .
d.
Remove 7/16 inch nut and washer holding RPG to Keyboard Assembly .
e.
Disconnect cable from keyboard printed circuit board .
7 .
Disconnect RPG cable from keyboard assembly .
8 .
Replace Keyboard Assembly by reversing this procedure .