Model
141A
Section
V
Paragraphs
5-51
to
5-54
b. Disconnect the white-gray and white-green-gray
c. Remove
all
transistor heat sinks from the fan
d. Remove the four fan mounting nuts on the
rear
e. Lift out the fan assembly.
wires
from the fan terminals.
assembly and push them out of the way.
panel
of
the instrument.
5-51.
HV
DECK REMOVAL AND
REPLACEMENT.
Most of the components on the high voltage deck can
be replaced without removing the assembly. Other
components can be removed and replaced by moving
the deck part way out (without disconnecting
wires).
Refer to Figure
5-3
for mounting screws and wire
identification; use the following procedure for remov-
ing the high voltage deck.
a. Remove the left side and top covers.
b. Disconnect the
6
wires
from the board and re-
move the
4
mounting screws;
see
Figure
5-3
for wire
and screw identifi
c. Disconnect
f
CRT.
d. Push the wii
left side of the ins
5-52.
SERVICING
5-53.
The Model
1
_v
VI
..._
rAu..,..
through type. When servicing this type board, com-
ponents can be removed and replaced by applying
a
soldering iron tip to the component connection on either
side
of
the board. When removing a component with
multiple leads, such as potentiometers, move the
soldering iron tip from lead to lead while applying
moderate pressure to the component to lift it from the
board. Excess solder can be removed by applying
heat and rotating a wooden toothpick in the hole.
Hewlett-PackardService Note M-20D contains addition-
al information on therepair of circuit boards; impor-
tant considerations
are
as follows:
a. Do not apply excessive heat.
b. Apply heat to component leads andremovecom-
c. Do not force replacement component
leads
into
ponent with a straight pull away from the board.
the hole.
I
l4lA-A-4
Figure
5-3.
High Voltage Deck Removal
5-54.
If
the metal conductor
lefts
from the
board,
it
can be cemented back with aquick-drying acetate
base cement having good insulating properties.
If
the metal conductor
is
broken, solder
a
good con-
ducting bare wire to the conductor
so
it
bridges
the
break
.
02567-1
5-9
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