Agilent Technologies E3616A, E3614A, E3617A, E3615A service manual Replaceable Parts

Table A-7. Overvoltage Protection Circuit Troubleshooting

STEP	ACTION		RESPONSE		PROBABLE CAUSE
1	Short U19 pin 4 to TP6.	a.	Shutdown release	a. U20 defective or C57
			(OVP indicator OFF)		shorted.
		b.	Output voltage remains	b.	Proceed to step 2.
			shutdown(0 V)
2	Measure the voltage from	a.	High voltage (+5 V)	a. U19 defective or proceed step 3.
	TP6(common) to TP9.	b.	Low voltage (0 V)	b.	U4D defective.
3	Measure the voltage from	a.	Below +2.6 V	a. U12 or U8 defective
	TP6(common) to TP8.	b.	Above +2.6 V	b.	U18 defective

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.

	Table A-8. Reference Designators
A	Assembly
C	Capacitor
CR	Diode
DS	Signaling Device(light)
F	Fuse
G	Pulse Generator
J	Jack
L	Inductor
Q	Transistor
R	Resistor
S	Switch
T	Transformer
TP	Test Point
VR	Zener Diode
U	Integrated Circuit
W	Wire

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-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

A-12