HP 54501A - Removal and Replacement of

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 KeyboardAssembly 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 .