Troubleshooting Bias Supplies

+5V on A2 Control Board. The PWM A2U22 includes a clock generator (40KHz set by A2R170, A2C79, and A2Q10), and a current limit (2Adc set by 0.15Vdc across A2R172). It turns off each output pulse using the difference between the voltage at voltage divider A2R161-A2R163 and the 2.5Vdc set by voltage regulator A2U21.

Circuit Included. + 5Vdc bias supply circuitry from connector pin A1J5-1,3 (1,3 both pins) through jumper A2W3 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

A2J7-22

A2J4-4.

≈ 20Vdc

A1CR2,AlCR5

Outputs

 

 

 

NODE

 

MEASUREMENT

 

A2U22-6

 

≈ 2 to 4Vdc sawtooth, 40KHz

 

A2U22-12,13

 

≈ 19Vpk, 15∝s pulses, 40KHz

 

A2Q9 (emit)

 

≈ 20Vpk, 5∝s pulses, 40KHz

 

A2U21 -2

 

2.5Vdc

 

A2R161, A2R163

 

2.5Vdc

 

To check if load on + 5V is shorted, remove jumper A2W3

Table 3-4. A3 Front Panel Board Failure Symptoms

SYMPTOMS

DEFECTIVE CIRCUIT

CHECK COMPONENTS

Error when pressing DISPLAY SETTINGS

Limits display.

A3U5, A3U8

Error in VOLTS or AMPS

Input ranging or DVMS.

A3U8,A3U6,A3U4,A3U1,A3U2,

 

 

A3U7

* One or more display digits out

Display LEDs.

A3DS1 through A3DS8

Unable to adjust VOLTAGE or CURRENT

Potentiometers.

A3R99, A3R100

or always max

 

 

VOLTS decimal point error

Decimal drivers.

A3U3

*Note that the Volts and Amps tests (Table 3-3 pins 5 and 6) verify that all the current and voltage display segments light except for the decimal points.

Table 3 5. Performance Failure Symptoms

SYMPTOMS

DEFECTIVE

CHECK FUNCTIONAL CIRCUITS

 

BOARD

 

Unexplained OVP shutdowns

A2

OVP Circuit, CV Circuit

 

 

 

No current limit

A2

CC Circuit

 

 

 

Max current < 17Adc

A2

CC Clamp, CC Circuit

 

 

 

Max power < specified

A2, A1

Power Limit, 20KHz clock, transformer A1T2

 

 

 

Max voltage < 200Vdc

A2, A1

CV Circuit, diodes A1U1, mains voltage select

 

 

jumper A1W1

Cycles on & off randomly

A2, A1

AC-Surge-&-Dropout Detector, Mains Voltage

 

 

Select switch A1S2

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Agilent Technologies 6012B, 6010a, 6011A, 6015A Troubleshooting Bias Supplies, A3 Front Panel Board Failure Symptoms
Page 37 Page 39

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