HP 4262A User Manual

Section VIII
Paragraphs 8-46 to 8-48
8-46. REPAIR.
WARNING
BEFORE PROCEEDING WITH
REPAIR, BE SURE THAT IN-
STRUMENT IS DISCONNECTED
FROM POWER LINE!
847. REMOVAL OF Q2 or Q3.
a. Fully loosen top cover retaining screw located
at rear of instrument and lift off top cover.
b.
Remove
left
handle
mounting
screws
(2).
Slide
left
side
panel
toward
the
rear
of
in-
strument
and
take
off.
c.
Remove
the
two
transistor
retaining
screws.
d.
Lift
out
transistor.
e.
Install
new
transistor.
To
maintain
good
thermal diffusion, use fresh silicone paste on
transistor and insulator sheet.
Model 4262A
848.
LINE
SWITCH
(S1)
REMOVAL.
a.
Perform steps a and b of paragraph 8-47,
removal of Q2 and Q3.
. Remove the two screws which fasten LINE
switch S1 to plate on side frame.
. Remove the cable clamp screw (located at
center near top of side frame).
.
Pull
LINE
switch
toward
the
rear
of
instru-
ment and take out switch with extender shaft
from instrument.
. Pull extender shaft out of switch shaft. Un-
solder cable from switch.
Install new switch. Envelop the switch with
heat contractible tubing.
\ -
8-26
Fie 8-13. Protective Diode and ZERO ADJ Control Potentiometer Replacement.

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English