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Agilent Technologies 6612B Service Manual Download Page 30

3 - Troubleshooting

30

"D" From Sheet 6

Gated (G)+/-15V

@ F302 & F304

OK?

PM_INHIBIT @

R390 high

?

No

Replace A2 Interface

board

Check U311/U312

circuits

No

Yes

U321-5 > +15mV

?

Yes

Check R360 and

U326B circuit

No

Voltage @ U321-

7=U321-5

?

Check U321 circuit

No

Yes

Check output series

regulator and

downprogrammer

stages U308, U309,

Q303, Q306 through

Q310 and F309

Yes

Figure 3-1 Sheet 8. No Output

Summary of Contents for 6612B

Page 1: ...rement DC Source and Agilent Model 6612B System DC Power Supply For instruments with Serial Numbers Agilent 66312A US37442096 and up Agilent 6612B US37470826 and up 5 Agilent Part No 5962 0874 Printed...

Page 2: ...ducts returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent Tech...

Page 3: ...used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component...

Page 4: ...rminal for Neutral conductor on permanently installed equipment Terminal for Line conductor on permanently installed equipment On supply Off supply Standby supply Units with this symbol are not comple...

Page 5: ...updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected material since the previous printing date Changes to...

Page 6: ...hniques 12 Setup for Most Tests 12 Electronic Load 13 Current Monitoring Resistor 13 Operation Verification Tests 13 Performance Tests 13 Programming 13 Constant Voltage CV Tests 14 CV Setup 14 Voltag...

Page 7: ...ade Procedure 41 Disassembly Procedures 42 List of Required Tools 42 Cover Removal and Replacement 43 A2 Interface Board Removal and Replacement 43 Front Panel Assembly Removal and Replacement 43 A3 F...

Page 8: ......

Page 9: ...t within the dc power supply chassis This dc power supply is a Safety Class I instrument which means it has a protective earth terminal This terminal must be connected to earth ground through a power...

Page 10: ...overed in the backdating section in Chapter 6 Firmware Revisions You can obtain the firmware revision number by either reading the integrated circuit label or query the dc power supply using the GPIB...

Page 11: ...ing procedures in Chapter 3 The troubleshooting procedures will determine if repair and or calibration is required Test Equipment Required Table 2 1 lists the equipment required to perform the verific...

Page 12: ...tests are performed at the rear terminals of the supply as shown in Figure 2 1a Measure the dc voltage directly at the S and S terminals If the Power Supply is equipped with a Local Remote switch set...

Page 13: ...the supply is operating properly without testing all specified parameters perform the following test procedures a Perform the turn on and checkout procedures given in the Operating Manual b Perform t...

Page 14: ...est record chart for the appropriate model under CV PROGRAMMING 0 VOLTS Also note that the CV annunciator is on The output current reading should be approximately zero d Program the output voltage to...

Page 15: ...M The difference between the DVM reading is steps f and h is the source effect voltage and should not exceed the value listed in the performance test record chart for the appropriate model under CV SO...

Page 16: ...oltage should return to within the specified voltage v in less than the specified time t Check both loading and unloading transients by triggering on the positive and negative slope Constant Current C...

Page 17: ...The current on the UUT display should be approximately 0 mA c Record the current reading on the DMM and the reading on the front panel display The difference between the two readings should be within...

Page 18: ...erage reading program described under CC Load and Line Regulation e Short the load switch and record the output current reading The difference in the current readings in steps d and e is the load effe...

Page 19: ...at the full scale rating with the CC annunciator on e Divide the reading on the rms voltmeter by the monitor resistance to obtain rms current It should not exceed the values listed in the performance...

Page 20: ..._______ 3 mV 0 5 mV 872 V 50 V Transient Response Voltage in 100 s 0 mV _________ 20 mV 3 mV Constant Current Tests Current Programming and Readback Low current 0A Programming Readback Accuracy Iout 2...

Page 21: ...upply Troubleshooting procedures are provided to isolate a problem to one of the circuit boards or a particular circuit Figure 3 2 shows the location of the circuit boards and other major components o...

Page 22: ...neither an AC input nor a bias supply failure is causing the problem and that the supply passes the turn on self test error annunciator stays off The normal turn on self test indications are describe...

Page 23: ...voltage selection see Fig 3 3 4 Check ac and bias voltages see Table 3 3 No Is Fan on Yes 24V Q305 2 No Check 15V Unreg bias circuit Check fan and Fan Driver circuit No Yes Error Message displayed Ye...

Page 24: ...RI remote inhibit displayed replace A2 Interface board No R369 FUSE 2 4 5V Yes Replace A2 Interface board Check F309 VR305 R369 R414 and R454 No Yes Disable OCP Reset Protect and go to top of page RT3...

Page 25: ...Troubleshooting 3 25 Figure 3 1 Sheet 3 Main Flowchart...

Page 26: ...peed Down programming OK Check RI DFI port see User s Guide RI DFI OK Replace A2 Interface board Yes No No problems found with basic operation Perform Verification and Performance tests to determine i...

Page 27: ...ck 5V biases OK Check A1 5V Interface Bias Supply No Check 5V A2J211 Pin 1 to 8 5V OK Replace A2 Interface board Yes No Check for 5V pulses at A2J211 Pins 4 Tx and 5 Rx to primary ground Yes Tx Pulses...

Page 28: ...B circuit No If output is OK and readback is not replace A2 Interface board If the display equals the output troubleshoot U322A circuit Yes CV_PROG R322 should be 0 to 4 8 volts for 0 to full scale pr...

Page 29: ...isplay equals the output troubleshoot U324A B circuit circuits CC_PROG R336 is 0 to 4 8V for 0 to full scale programmed current IMON_H U318A 7 is 0 to 4 8 volts for 0 to full scale output current and...

Page 30: ...Replace A2 Interface board Check U311 U312 circuits No Yes U321 5 15mV Yes Check R360 and U326B circuit No Voltage U321 7 U321 5 Check U321 circuit No Yes Check output series regulator and downprogram...

Page 31: ...s high Disable the OV protection by sending the command DIAG SCR 0 No Unit still OVs U327 7 Low OV_DETECT OV_PROG 4V Yes Check that OV is programmed to maximum or replace A2 Interface board Check U327...

Page 32: ...Check Series Regulator circuits U309 Q303 Q308 etc No Check Vmon amplifier U322B Vmon 0 to 4 7V for 0 to full scale output voltage No Check U316A gain of 1 and U322A circuits Yes CONTROL U321B 7 0V Ye...

Page 33: ...high 5us Check Q301 U302A and all associated resistors and capacitors Yes No Check A1CR301 Yes Program the output voltage and current to the full scale value and the OV to 1 2 OV_Prog A1R321 2V A1 U32...

Page 34: ...UUT voltage to 0V Output ON and the test supply to 5V and 2A Meter indicates 5V 1 5A Unit operating normally Yes U321A 1 0 4V No Check U321A D327 R324 and R362 No U308A 1 1 5V Yes Check U308A Q306 D3...

Page 35: ...H U318A 6 3 5V Voltages OK Check U324A B Note U324A has a gain of 1 Check associated circuit Yes Control F307 U326B 6 U326B 6 0 6V Yes No Check R360 U321B No Check output and downprogrammer stages Q30...

Page 36: ...ROM A2 Interface Bd E4 Checksum in State Non volatile ROM A2 Interface Bd E5 Checksum in RST Non volatile ROM A2 Interface Bd E10 RAM test failed A2 Interface Bd E11 12 bit DAC test failed 0 is writte...

Page 37: ...CT or CC_DETECT low The low signal indicates an active status which is sent to the A2 board microprocessor The front panel CV annunciator indicates when the CV mode is active CV_DETECT is low The fron...

Page 38: ...to A1 Main board A1J307 Pin Signal Name CV Mode Full Scale Voltage No Load CC Mode Full Scale Voltage Full Load 1 PM_INHIBIT Enabled 0 0 2 OV_SCR 5 5 3 OV_PROG 3 9 3 9 4 FAN_PROG 2 8 3 8 5 OV_DETECT...

Page 39: ...s select FAN MODE MAN d Press Enter e Simultaneously depress the 0 and 1 keys EEINIT model will be displayed f Using the Up Down annunciator keys select FAN SPEED data g Press Enter Number h Enter the...

Page 40: ...rder to calibrate the supply This four section switch S201 is located on the A2 Interface board near the GPIB connector The switch has 2 functions related to calibration One is Inhibit Calibration Wit...

Page 41: ...IDN query to identify the revision of the supply s firmware The query will readback the revisions of the Primary Interface ROM located on the A2 Interface board The manufacturer and model number of th...

Page 42: ...personal injury turn off AC power and disconnect the line cord before removing the top cover Disconnect the GPIB cable and any loads and remote sense leads before attempting disassembly CAUTION Most o...

Page 43: ...nd tabs as shown by the arrows in the following figure f To reinstall the Interface board perform the above steps in reverse order Front Panel Assembly Removal and Replacement This procedure removes t...

Page 44: ...e main control board to the chassis e Slide the main board towards the front panel to release it from chassis mounted standoffs and then lift the board out of the chassis T1 Power Transformer Removal...

Page 45: ...d grey grey orange orange white red grey grey orange spare orange spare orange white red white black white brown white brown white black white red red black white violet white yellow white violet whit...

Page 46: ......

Page 47: ...s and devices Table 4 1 Power Supply Interface signals Connector Signal Description Front panel outputs OUT OUT Positive DC output voltage Negative DC voltage or return Rear panel output sense screw t...

Page 48: ...rface The primary microprocessor circuits DSP ROM and RAM chips decode and execute all instructions and control all data transfers between the controller and the secondary interface The primary microp...

Page 49: ...Principles of Operation 4 49 Figure 4 1 A2 A3 Block Diagram...

Page 50: ...output voltage VMon monitored high range current Imon_H monitored low range current Imon_L and monitored peak current Imon_P All measurement signals are in the range of 0 to 5V which corresponds to th...

Page 51: ...Principles of Operation 4 51 Figure 4 2 A1 Block Diagram...

Page 52: ...e the output voltage Conversely if the output voltage is less than the programmed voltage the Control signal goes high causing the regulator to conduct more and increase the output voltage Depending u...

Page 53: ...t signal goes low which informs the logic aray that an OV condition has occurred The crowbar control circuit is enabled when the OV_SCR signal is received When an overvoltage condition occurs the SCR...

Page 54: ......

Page 55: ...y G1 0960 0892 1 Rotary pulse generator T1 9100 5399 1 Main Power Transformer W 1 06611 80003 1 Primary Power Cable W 2 06611 80006 1 Interface Power Cable W 3 06611 80004 1 Secondary Power Cable W 4...

Page 56: ...P18 0515 0433 6 Screw M3x0 5x6mm Torx T10 Pan Conical cup MP19 06611 20003 1 Insulator Pad MP20 06612 20002 1 Thermal Insulator MP21 0380 0644 2 Stud Mounted Standoff ref GPIB Connector MP22 2190 0586...

Page 57: ...Replaceable Parts 5 57 Figure 5 1 Mechanical Parts ldentification...

Page 58: ...p 100 pF 5 C321 0160 4833 1 Cap 0 022 uF 10 C322 323 0160 4801 2 Cap 100 pF 5 C324 0160 6827 1 Cap 0 022 uF 400V C325 0160 4801 1 Cap 100 pF 5 C326 327 0160 4791 2 Cap 10 pF 5 100V C328 0160 7277 1 Ca...

Page 59: ...60 5644 1 Cap 0 033 uF 50V CR301 06611 60008 1 Assembly REG HS 2200 0143 1 Ref CR301 Machine Screw 4 40 1884 0310 1 Ref CR301 Thyristor SCR MCR69 3 1901 0987 1 Ref CR301 Diode Power see CR301 0590 019...

Page 60: ...252 5977 1 Connector J308 1252 3771 1 AC Input Connector J309 1252 7041 1 Connector J314 1252 0063 1 Connector CR301 06611 60008 1 Connector Q301 1854 1330 1 Transistor NPN Q302 06611 60007 1 Assembly...

Page 61: ...98 6360 1 Res 10K 0 1 R326 327 0757 0442 2 Res 10K 1 0 125W R328 329 0698 6360 2 Res 10K 0 1 R330 0698 3496 1 Res 3 57K 1 0 125W R331 7175 0057 1 Jumper Wire 22 R332 0698 6360 1 Res 10K 0 1 R333 334 0...

Page 62: ...R373 0698 0082 1 Res 464 Ohm 1 0 125W R375 0698 6631 1 Res 2 5K 0 1 R376 0757 0340 1 Res 10K 1 0 25W R377 0757 0394 1 Res 51 1 Ohm 1 0 125W R378 0698 3445 1 Res 348 Ohm 1 0 125W R379 0757 0199 1 Res...

Page 63: ...Res 72 Ohms R430 0686 2225 1 Res 2 2K 5 0 5W R431 0811 3771 1 Res 0 25 Ohm 1 R432 433 0699 0267 2 Res 10K 0 05 0 1W R434 435 0699 1513 2 Res 40K 0 05 0 1W R436 438 0699 4707 3 Res 0 25 Ohm 5 3W R439 0...

Page 64: ...ansistor Array U312 1858 0076 1 Transistor Array U315 316 1826 1533 2 Integrated Circuit U318 319 1826 3521 2 Integrated Circuit U320 321 1826 1533 2 Integrated Circuit U322 1826 1878 1 Integrated Cir...

Page 65: ...esistors are in ohms 1 1 8 W unless otherwise specified a All capacitors are in microfarads unless otherwise specified a Unless otherwise noted bias connections to integrated circuit packages are as f...

Page 66: ...7 R317 1 625 3 975 R385 7 725 3 975 Rt301 1 002 4 944 C334 4 6 2 0 D314 6 425 0 6 R318 3 225 1 225 R386 5 85 4 2 S301 9 757 0 326 C335 6 325 1 65 D315 2 25 2 35 R319 7 525 2 975 R387 6 55 4 65 S302 1...

Page 67: ...Figure 6 1 A1 Board Component Locations...

Page 68: ...Figure 6 2 A4 Board Component Locations...

Page 69: ...Figure 6 3 A1 Board schematic sheet 1...

Page 70: ...Figure 6 3 A1 Board schematic sheet 2...

Page 71: ...Figure 6 3 A1 Board schematic sheet 3...

Page 72: ......

Page 73: ...yrights 5 cover removal 43 current monitoring resistor 13 current sink 17 CV 37 CV load effect 14 CV loop 52 CV Noise 15 CV source effect 15 CV CC control 50 52 CV_Detect 48 52 CV_Prog 50 52 D DAC 48...

Page 74: ...upgrade 41 RPG 48 RS 232 47 S safety considerations 9 safety summary 3 schematic A1 69 70 71 A4 68 schematic notes 65 SCR 52 secondary interface 48 self test 36 sense 47 sense switch 52 serial number...

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