Table 3-2. No-Output Failures

(Bias supplies and AC turn-on circuit functioning)

Status of PFET on/off-Pulses

PWM-ON

PWM-OFF

DEFECTIVE

CHECK FUNCTIONAL CIRCUITS

A2J7-26

A2J7-25

BOARD

 

lo

lo

A2

Control ckts: CV & CC thru on- & off-Pulse Oneshots *

lo

hi

A2 & A4

PWM and DC-to-DC Converter: A4Q1, A4Q2, A4Q3 and A4Q4

 

 

 

probably failed

hi

lo

A2 & A4

PWM and DC-to-DC Converter: A4Q1, A4Q2, A4Q3 and A4Q4

 

 

 

probably failed

hi

hi

A2 & A4

PWM and DC-to-DC Converter: A4Q1, A4Q2, A4Q3 and A4Q4

 

 

 

probably failed

lo

N

A2

A2U15A,on-Pulse Oneshot and A2Q11

N

lo

A2 & A4

Off-Pulse Oneshot and DC-to-DC: A4Q1, A4Q2, A4Q3 and A4Q4

 

 

 

probably failed

hi

N

A2 & A4

A2U15A, on-Pulse Oneshot & DC-to-DC: A4Q1, A4Q2, A4Q3, and

 

 

 

A4Q4 probably failed

N

hi

A2 & A4

off-Pulse Oneshot and DC-to-DC: A4Q1, Q4Q2, A4Q3 and A4Q4

 

 

 

probably failed

N

N

A2 & A4

Power-Limit Comparator and DC-to-DC: A4Q1, A4Q2, A4Q3 and

 

 

 

A4Q4 probably failed

lo= TTL low

hi= TTL high

 

N = normal 20KHz pulse train, TTL levels

*Decide which to troubleshoot -- the CV Circuit, the CC Circuit, or the PWM and Off-Pulse & On-Pulse Oneshots -- by measuring the CV CONTROL (A2CR24, cathode) and the CC CONTROL (A2CR11 cathode) voltages. Troubleshoot whichever is negative, and if neither is negative, troubleshoot the PWM. Make these voltage measurements after you have implemented the Main Troubleshooting Setup.

Table 3-3. Front Panel Board Tests

.

Pin

Signal Name

Measurement

Description

Source

No

 

 

 

 

1

+7.5V

7.5V

Derived from + 15V bias.

A3VR2, A3R93

2

-1V

-1.0V

Derived from –15V bias.

A3R89, A3R94, A3C17

3

CV VOLTAGE

0-5V

For 0 to full scale output voltage.

A3U6-6, A3R88, A3CR1

4

CC VOLTAGE

0-5V

For 0 to full scale output current.

A3U7-1, A3R58

5

VOLTS test

-1888 on volts

Jumper to + 5V on A3 board.

A3U1-37

 

 

display

 

 

6

AMPS test

-1888 on amps

Jumper to + 5V on A3 board.

A3U2-37

 

 

display

 

 

7

VOLTS input

0-1V

For 0 to full scale output voltage.

A3U4-2,3,10

8

VOLTS low range

TTL high

If VOLTS display is below 20 volts

A3U5-13

 

 

 

(press DISPLAY SETTINGS).

 

9

DISPLAY

TTL lo

If DISPLAY SETTINGS switch on

A3S1,A3R85

 

SETTINGS

 

front panel is depressed.

 

10

DISPLAY OVP

TTL high

If DISPLAY OVP switch on front

A3S2,A3R64

 

 

 

panel is depressed.

 

11

AMPS input

0-600mV

For 0 to full scale output current.

A3R56,A3R58

12

-5V

-5.0V

Derived from -15V bias.

A3VR1, A3R90

13

buffered OVP

0-2.2V

1/30 of OVP voltage setting when

A3U7-7,A3CR5

 

 

 

DISPLAY OVP switch is depressed

 

 

 

 

varies with OVP ADJUST pot.

 

37

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Image 37
Agilent Technologies 6011A, 6010a, 6012B, 6015A service manual A2J7-26 A2J7-25

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