Table 3 5. Performance Failure Symptoms (continued)

SYMPTOMS

DEFECTIVE

CHECK FUNCTIONAL CIRCUITS

 

BOARD

 

CV overshoots

A2

A2U5A, A2CR19, A2R62

 

 

 

Output noise ( < 1KHz)

A2, A1

CV Circuit, Input Filter

 

 

 

Output noise ( > 1KHz)

A1, A4

Transformer A1 T2, output Filter, snubbers A4R1

 

 

to A4R11, A4R13 to A4R19, A4C1 to A4C4,

 

 

A4CR1 to A4CR4

CV regulation, transient response,

A2, A1

Wrong sensing (paragraph 3-40), low ac mains

programming time

 

voltage, CV Circuit

CC regulation

A2

Low ac mains voltage, CC circuit

 

 

 

CV oscillates with capacitive loads

A2

A2R61, A2R60, A2R58, A2R59, A2C33, A2R64,

 

 

A2R68, A2C36, A2C37, A2U5, A2R65

CC oscillates with inductive loads

A2

A2R61, A2R60, A2R58, A2R57, A2C33, A2R19,

 

 

A2C11, A2R58, A2C12, A2U4, A2R35, A2C20,

 

 

A2R37, A2C17, A2R29, A2C18, A2R31

+15V on A2 Control Board. Voltage regulator A2U11 regulates the voltage across resistor A2R99 to be 1.25Vdc. That sets the current through zener diode A2VR3 at 7.5mAdc. The output voltage is 1.25Vdc plus 11.7Vdc across A2VR3 plus the voltage across A2R100.

Circuit Included. + 15Vdc bias supply circuitry from connector pin A2J5-5 through test point A2J7-2 on A2 control board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the external supply to 0Vdc.

Input:

 

 

 

NODE (+ )

NODE ( - )

MEASUREMENT

SOURCE

A2C52(+)

A2C52(-)

≈ 27Vdc

A1U4 ,AlC15 (+)

 

 

 

A1U4,A1C17 (+) (6011A)

Outputs:

 

 

 

NODE ( + )

N0DE ( - )

MEASUREMENT

A2J7-2

A2U11 (ADJ)

1.25Vdc

 

A2J7-2

A2VR3 (Anode)

12.9Vdc

 

A2J7-2

A2VR2 (Anode)

6.2Vdc

 

A2C50 ( + )

A2C50 ( - )

13.8Vdc

 

To check if load on + 15V is shorted, remove jumper A2W1 .

-15V on A2 Control Board. Voltage regulator A2U12 regulates the voltage across resistor A2R103 to be 1.25Vdc.

Circuit Included. -15Vdc bias supply circuitry from connector pin A2J5-6 through test point A2J7-21 on A2 control board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the external supply to 0Vdc.

39

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Image 39
Agilent Technologies 6015A, 6010a, 6011A, 6012B service manual Node + N0DE

6015A, 6012B, 6011A, 6010a specifications

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