Agilent Technologies Agilent E3616A Serials KR83502651 Step Action Response Probable Cause

Page 24

 

 

Table A-3. Overall Troubleshooting (Cont’d)

 

 

 

SYMPTOM

 

CHECKS AND PROBABLE CAUSES

 

 

 

Poor Load Regulation

a.

Refer to "Measurements Techniques" paragraph.

(Constant Voltage)

b.

Check +10 V reference voltage.

 

c.

Ensure that the supply is not going into current limit.

 

 

 

Poor Load Regulation

a.

Check +10 V reference voltage.

(Constant Current)

b.

CR1, CR19, CR20, C2, C31 leaky.

 

c. Ensure that the supply is not crossing over to constant voltage operation.

 

 

 

Oscillates (Constant Voltage/

a.

Check C29 and C36 in constant voltage circuit.

Constant Current)

b.

Check C31 and C33 in constant current circuit.

 

 

 

Poor Stability

a.

Check +10 V reference voltage.

(Constant Voltage)

b.

CR27, CR28, CR23, and CR26 leaky.

 

c.

U9 defective.

 

d. Noisy programming resistor R83.

 

 

 

Poor Stability

a.

Check +10 V reference voltage.

(Constant Current)

b.

CR24, CR25, CR29, and CR30 leaky.

 

c. U9 and U10 defective.

 

d. Noisy programming resistor R85.

 

 

 

Excessive heat

a.

Check preregulator control circuit. Refer to Table A-6.

 

b. CR10, CR12, CR15, and CR18 short

 

 

 

OVP Shutdown

a.

Check that the front panel OVP Adjust screw control is rotated fully clockwise.

 

b. Check the overvoltage protection circuit.

 

 

Refer to "Overvoltage Protection Circuit Troubles" paragraph or Table A-7.

 

 

 

Table A-4. High Output Voltage Troubleshooting

STEP

ACTION

 

RESPONSE

 

PROBABLE CAUSE

 

 

 

 

1

Check turn off of Q1 and

a. Output voltage remains high.

a. Q1 or Q4 shorted.

 

Q4 by shorting Q9 emitter

b.

Output voltage decreases.

b.

Remove short and proceed to step 2.

 

to collector.

 

 

 

 

 

 

 

 

 

2

Check turn on of Q9 by

a. Output voltage remains high.

a.

Q9 open.

 

shorting point 1 to -12 V.

b.

Output voltage decreases.

b. Remove short and proceed to step 3.

 

 

 

 

 

3

Check voltage from pin 5

a. Input voltage is positive.

a.

U9B is defective.

 

to pin 6 of U9.

b.

Input voltage is negative.

b. Turn down the voltage control fully

 

 

 

 

 

counter clockwise. Check the voltage

 

 

 

 

 

of U9 pin 1 is 0.

 

 

 

 

 

 

Table A-5. Low Output Voltage Troubleshooting

STEP

ACTION

 

RESPONSE

 

PROBABLE CAUSE

 

 

 

 

1

Check turn on of Q1 and

a. Output voltage remains low.

a. Q1 or Q4 open.

 

Q4 by disconnecting emitter

b.

Output voltage increases.

b.

Reconnect emitter lead and proceed to step 2.

 

of Q9.

 

 

 

 

 

 

 

 

 

2

Check turn off of Q9 by

a. Output voltage remains low.

a.

Q9 shorted.

 

shorting point 1 to +15 V.

b.

Output voltage increases.

b. Remove short and proceed to step 3.

 

 

 

 

3

Eliminate constant current

a. Output voltage is increases.

a. Proceed to step 4.

 

comparator as a source of

b.

Output voltage remains low.

b.

Reconnect lead and proceed to step 5.

 

trouble by disconnecting

 

 

 

 

 

anode of CR22.

 

 

 

 

 

 

 

 

 

 

A-10

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Contents Agilent E361xA 60W Bench Series DC Power Supplies Safety Summary Operating Instructions General Information Operating Temperature Range Meter Programming ResolutionTemperature Coefficient Line FuseInstallation Installation DataInput Power Requirements Initial InspectionTURN-ON Checkout Procedure Power CordOperating Instructions IntroductionLocal Operating Mode Connecting LoadsOperating Modes Operation Beyond Rated OutputRemote Operating Modes Remote Voltage SensingRemote Analog Voltage Programming MULTIPLE-SUPPLY Operation Normal Parallel OperationAUTO-PARALLEL Operation Normal Series Operation Gramming according to the remote-programming instructionsAUTO-SERIES Operation Total output voltage to ground must not exceed 240 VdcAUTO-TRACKING Operaton = slave output voltageLoad Considerations Service Information Maintenance Test Equipment RequiredOperation Verification Tests Type Required Characteristics USE Recommended Model Performance TestsMeasurement Techniques Constant Voltage CV Tests Load Regulation Load EffectLine Regulation Source Effect Load Transient Response TimePARDRipple and Noise Pardrms MeasurementPARDPeak-to-Peak Measurement Constant Current CC Tests CV Drift StabilityAdjustment and Calibration Procedure CC Drift StabilityTroubleshooting Overall Troubleshooting ProcedureReference and Bias Circuit Regulating Loop TroublesSymptom Checks and Probable Causes Overvoltage Protection Circuit TroublesStep Action Response Probable Cause Step Measure Response Probable Cause Replaceable Parts Table A-10. Replaceable Parts List Table A-10. Replaceable Parts List Contd R28,111 0698-3228 Resistor 49.9K +-1% .125W TF TC=0+-100 RESISTOR-VAR 10K +-10% ALL IC V RGLTR-FXD-POS 4.8/5.2V TO-220 PKG ALL DIODE-GEN PRP 180V 200MA DO-35 ALL Table A-11. Component Value Model Manual Supplement Constant Voltage Mode T EAlternative Voltage Programming Using Resistors Programming Voltage Common to the Minus OutputR1 and R2 should be in the 1KΩ to 100KΩ range 10-3 Constant Current Mode Constant Current with Voltage ProgrammingCurrent Monitoring Remote Resistor Programming Connections Remote Resistor Programming, Constant VoltageRemote Resistor Programming, Constant Current Certification Declaration of Conformity

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