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6

Baker Instrument Company

The Measure of Quality

O

PEN GROUND FAULT INDICATOR LAMP LIT

1.

 

Check that the tester is being operated with a two wire cord with a ground prong.

2.

 

Check for a broken ground connection in the power cord.

3.

 

Check that if being powered from an isolation transformer that a proper ground is
supplied to the tester.

4.

 

Check the mating ground pin receptacle at the power outlet for a bad connection.

5.

 

Check continuity from the ground prong on the input power receptacle to the Power
board P2 pin 1 and also to chassis ground.

6.

 

Check MOV 1, MOV 2, MOV 3 for electrical damage.  If damage is found also check
for burnt traces on both sides of this assembly.  Replace Power board if traces are
damaged.

 

Also to prevent future damage to this assembly or possible further damage,
measure and correct line voltage fluctuations so that they remain consistently with
the following parameters.

Unit

Line Voltage Range

Lower                                    Upper

D6000

100 Volts AC

120 Volts AC

D12000

100 Volts AC

120 Volts AC

DS206

220 Volts AC

250 Volts AC

DS212

220 Volts AC

250 Volts AC

7.

 

Check signal at Q1 collector on the Power board for a .4 volt ripple, if not replace Q1.

8.

 

Check U9 pin 3 on the I/O board for a 0 volts and U9 pin 4 for five (5) volts DC, if
not replace U9.

9.

 

Check Q6 on the I/O board for a collector to emitter short, if so then replace Q6.

10.

 

Check for a shorted Open Ground LED.

Summary of Contents for D6000

Page 1: ...ault indicator lamp lit 7 Hipot Current Bar display not present 8 CRT blank when PTT button depressed surge mode 9 Hipot voltage bar display not present 10 Seconds div volts div A div or function disp...

Page 2: ...and unhinge the rear cover 2 Locate and remove four 4 Phillips M4 x 10mm screws Two are located on the left side and two are located on the right side 3 Reinstall the rear cover 4 Locate and remove o...

Page 3: ...sis to the left and right side case L brackets Two are located to the left of the CRT shield two are located to the right of the high voltage transformer and one is located underneath the test select...

Page 4: ...move two 2 M3 x 7mm hex head screws located above the open ground indicator and below the horizontal position knobs 6 Position fingertips behind the stenciled panel for this assembly and pull away fro...

Page 5: ...be no display upon power up or self tests or no change when any of the output controls are used 3 Loss of or loading of 5 volt supply will cause a total non operation of the tester There will be no di...

Page 6: ...damage If damage is found also check for burnt traces on both sides of this assembly Replace Power board if traces are damaged Also to prevent future damage to this assembly or possible further damage...

Page 7: ...amage the potentiometers or cause fractured solder joints at the legs of the potentiometers 5 Remove the remaining printed circuit board the Controller board Grasp at the edges of this assembly and pu...

Page 8: ...ese wires from the right side of the card cage The length of these wires should be long enough to reach the front panel Tie wrap and secure these wires along the right side of the card cage Obtain a t...

Page 9: ...A division 4 Measure at U11 pin 3 on the I O board and raise output control to 6 kV The measurement should increase negatively as more current is drawn through the test load At 6 kV this should be app...

Page 10: ...ard Check D1 Q2 and U9 for defects and replace if necessary Signal at U19 pin 3 should be a 5 volt square wave with a frequency of 60 Hz 3 Check the real test signal at U29 pin 16 on the Controller bo...

Page 11: ...all SCR s Q1 through Q10 for shorts by measuring the resistance across all cathode to anode junctions of each SCR Replace those SCR s found to be shorted Readings should be 700K ohms or higher Bad ju...

Page 12: ...up to control a binary pattern for control lines Sweep A B C and D See4 binary chart on the I O board A typical fault would be seen as a duplication of any one of the possible displayed sweep settings...

Page 13: ...st be used with an Epson FX dot matrix printer And it must be configured properly to interface Firmware revision 1 35 is used with the Epson dot matrix printer Digital models after serial number 370 o...

Page 14: ...ontroller board Replace if necessary 8 Check P1 CRT pin 9 for a 5 volt positively pulsed waveform Repetition rate will be every 17mS and the positive duration should be 500 S If not present trace sign...

Page 15: ...ith the negative lead to chassis ground and turn output control to output Set scope settings to the same as in step 5 This measurement should be approximately 7kV AC with the negative portion clipped...

Page 16: ...ese measurements If measurement in step 5 is not present and all connections are verified then replace the high voltage transformer T1 7 Reconnect T1 secondary wire and lift D3 cathode on the Stack bo...

Page 17: ...he PTT button or the footswitch to the T2 variac The Zero Start Interlock board would switch the voltage from T2 pin 3 to the primary of the high voltage transformer To engage the Zero Interlock the f...

Page 18: ...d 20 gauge wire from J1 pin 1 on the Zero Start Interlock board to K2 C NO contact 7 Connect a red 20 gauge wire from T2 pin 2 to K1 B NO and K1 A NO 8 Connect a 26 gauge jumper on the rear of the I O...

Page 19: ...J2 pin 2 on the Zero Start Interlock board this measurement needs to be 5 5 volts DC and change to approximately 4 volts DC when the PTT button is depressed If this is present check Q1 through Q5 and...

Page 20: ...at the tester will illuminate the Baker logo and proceed with it s internal memory test All self tests will pass After an attempt to begin testing by depressing the PTT button there will be no change...

Page 21: ...power 4 Insert the A D board into the J1 connector and switch power on If the display returns to the original fault condition then a fault will be on the A D board Turn off tester power 5 Insert the I...

Page 22: ...isplay 2 To access the I O board Baker part 80 108 locate on the front panel which has the function knob Volts Division knob and the Seconds Division knob 3 Remove two 2 M3 x 7mm hex head screws locat...

Page 23: ...ard components R3 and C1 were changed to increase reliability of Q1 on the Power board 3 Discharge board changes include changes in the value of resistor R5 to provide for a greater incoming signal to...

Page 24: ...ten minute megohm test Other changes in the firmware have added the capability to recall in any summary all three surge test patterns with the test voltages of each lead displayed This 1 37 revision c...

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