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. Locate two #2 holes with threaded inserts
just to the left of the power supply termi-
nal block and install the 425150 load
resistor using provided #2x3/8 screws (A),
as shown in photo.
5. Disconnect cooling assembly red and
black wired connector from the M20150
harness.
6. Plug both connectors into the mating con-
nector of the load resistor assembly.
7. Replace the instrument cover and restore
power.
8. Verify correct operation using the “A/D
Test” in TEST utilities.
42P150R Rev0
(4D35/MK05/3255 Service Manuals)
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