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A-12
REPLACEABLE PARTS
INTRODUCTION
This section contains information for ordering replacement
parts. Table A-10 lists parts by reference designators and pro-
vides the following information:
a. Reference designators. Refer to Table A-8.
b. Agilent Technologies Part Number.
c. Total quantity used in that assembly.
d. Description.
e. Manufacturer's supply code number. Refer to Table
A-9 for manufacturer's name and address.
f. Manufacturer's part number or type.
Mechanical and miscellaneous parts are not identified by ref-
erence designator.
ORDERING INFORMATION
To order a replacement part, address order or inquiry to your local Agilent Technologies sales office (see lists at rear of this manual for
addresses). Specify the following information for each part: Model, complete serial number of the power supply; Agilent Technologies
part number; circuit reference designator; and description.
Table A-7. Overvoltage Protection Circuit Troubleshooting
STEP ACTION RESPONSE PROBABLE CAUSE
1 Short U19 pin 4 to TP6. a. Shutdown release
(OVP indicator OFF)
b. Output voltage remains
shutdown(0 V)
a. U20 defective or C57
shorted.
b. Proceed to step 2.
2 Measure the voltage from
TP6(common) to TP9.
a. High voltage (+5 V)
b. Low voltage (0 V)
a. U19 defective or proceed step 3.
b. U4D defective.
3 Measure the voltage from
TP6(common) to TP8.
a. Below +2.6 V
b. Above +2.6 V
a. U12 or U8 defective
b. U18 defective
Table A-8. Reference Designators
A Assembly
C Capacitor
CR Diode
DS Signaling Device(light)
FFuse
G Pulse Generator
JJack
L Inductor
Q Transistor
RResistor
SSwitch
T Transformer
TP Test Point
VR Zener Diode
U Integrated Circuit
WWire
Table A-9. Code List of Manufacturers
CODE MANUFACTURER ADDRESS
01295 Texas Instruments Inc, Semicon Comp Div. Dallas, TX
14936 General Instruments Corp, Semicon Prod Hicksville, N.Y.
27014 National Semiconductor Corporation Santa Clara, CA
28480 Agilent Technologies Palo Alto, CA
04713 Motorola Semiconductor Products Phoenix, AZ
32997 Bourns Inc. Riverside, CA
34371 Harris Corp. Melbourne, FL