Model 141A Section V
Paragraphs 5-51 to 5-54
b. Disconnect the white-gray and white-green-gray
wires from the fan terminals.
c. Remove all transistor heat sinks from the fan
assembly and push them out of the way.
d. Remove the four fan mounting nuts on the rear
panel of the instrument.
e. Lift out the fan assembly.
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..,.. I
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 l4lA-A-4
board. Excess solder can be removed by applying
heat and rotating a wooden toothpick in the hole. Figure 5-3. High Voltage Deck Removal
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. 5-54. If the metal conductor lefts from the board,
b. Apply heat to component leads andremovecom- it can be cemented back with aquick-drying acetate
ponent with a straight pull away from the board. base cement having good insulating properties. If
the metal conductor is broken, solder a good con-
c. Do not force replacement component leads into ducting bare wire to the conductor so it bridges the
the hole. break .
02567-1 5-9 |