Load Resistor Replacement Instruction
(Models 4D3, 3D3, Mark 2, Mark 3, 3250, and 4250)
Reference: Use this instruction to install part
425150R.
For Use On Models:
4D3 with Serial Suffix N or later
3D3 with Serial Suffix L or later
MK2 with Serial Suffix G or later
MK3 with Serial Suffix E or later
3250 -- All
4250 -- All
Tools Needed: Small Phillips screwdriver.
Warning-Hazardous Voltage
Warning-Internal components may be
damaged by static electricity.
Instruction:
1. Turn off the instrument power and discon-
nect the power cord.
For additional information or technical assistance,
please contact Advanced Instruments Hot-Line
®
Service Center (U.S. 1-800-225-4034, outside North
America +US 1-781-320-9000).
2. Remove the instrument cover.
3. Pull and drop the keypad and display for-
ward.
4. Looking down from above onto the chas-
sis, locate the load resistor as shown in
the photograph. In older models, it is
located behind the keypad assembly and
to the right of the cooling assembly. In
some older models, the load resistor will
not be present, but the mounting holes
will still be present. In 3250/4250 Serial
Suffix D or later, it will be located
towards the rear of the instrument, behind
the cooling assembly.
a. With no load resistor present
:
Install the 425150 load resistor assem-
bly using #2 x 3/8 screws (A) provided,
sa shown in the photo. Disconnect hte
cooling assembly red and black wired
connector from the main harness, then
plug those connectors into the mating
42P150R Rev1
(4D35/MK05/3255 Service Manuals)
Page 1 of 2
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