Advantest R6243 DC Voltage Current Source/Monitor Error 337 & Mini Teardown

[coldframe]

Hello Forum.

I just recently acquired  ADCMT(Formerly known as  Advantest) R6243 DC Voltage Current Source/Monitor (aka SMU),
bought as Selftest Fail at Bargain price. Unit is pretty good shape

BTW, I am going to share a few photo.

#0,1 Outline
19" Standard Rack Size, Net. Weight Aprox. 15Kg(33lb), Date of MFG 2003.




There are Two+1 PCB  in Unit.
Top is Linner Power Supply, Bottom is Digital/Analog Board




#2, Front/Rear Panel
Warning : There is no Front/Rear Switch, all connected to one another Why???





#3,  Digital&Analog Board
more detail next (counterclockwise 1,2,3,4)



#3-1 Q1  DAC, ADC Reference Voltage
2xAD7846 DAC http://www.analog.com/media/en/technical-documentation/data-sheets/AD7846.pdf



#3-2 Q2 External IN/OUT, Display(VFD), Keypad Interface
MAX202 +5V, RS-232 Transceivers (for maintenance? I Discoverd Operation Manual, there is no mention of RS-232C)
http://datasheets.maximintegrated.com/en/ds/MAX200-MAX213.pdf


#3-3 Q3 GPIB, Main MCU, D/A Photocoupler
Main Processor Toshiba TMPG68303F(motorola 68000)  http://data.leocom.kr/datasheets/upload/tmp68303f.pdf


#3-4 Q4 Front/Rear Panel I/F, Range/Function Relay, Low themal reed Relay(TRY-104S), PrecisionResistor(Black Heat sink)





#4, Voltage Reference & Precision Resistor
Linear  LT1021 10V Precision Reference 
http://cds.linear.com/docs/en/datasheet/1021fc.pdf

Alpha Electronics  Ultra Precision (Power) Resistor 0.2R, 2R, 20R
http://www.alpha-elec.co.jp/w2img/ww0923133717H2667002-MA-MB-MC-MD(E)_final_01Jun2015.pdf
http://www.alpha-elec.co.jp/w2img/ww0923133025H26through06.pdf





#5,  a lot of TestPoint





#6,  Selftet ERROR Code,
This is My Problem, Unluckily, Still Fails the Power On Selftest and ERROR +337





#7, Cheap Explain ERROR Code(from Operation manual)
ERROR:+337 "VSVM 3.2V -FS"
VSVM:Voltage Source, Voltage Measure, FS:Full Scale





Spec:
https://www.rohde-schwarz.com/en/product/r6243-6244-productstartpage_63493-8306.html
https://cdn.rohde-schwarz.com/pws/dl_downloads/dl_common_library/dl_brochures_and_datasheets/pdf_1/ADCMT_SMUs_overview.pdf

Operation Manual:
https://drive.google.com/folderview?id=0BxD05xrbn-k6fl9SaHM3a3E1TnNLWmZDNGtXTVFyUUt5SFY3S2VfZE5DcEszMDVRVXdpTlE&usp=sharing

More Hi-Resolution photos https://www.flickr.com/photos/119902516@N06/sets/72157656157145255

Anybody know where I might get Service Manual.
If someone has experiences with this unit, please share knowledge or any Suggestion, rumour, Check Point.
Please let me know if you have any  questions or Photo(Any Parts, Any Angle).

Thanks
coldframe

[coldframe]

Does anyone have any experience with SMU(Source Measurement Unit)? or  Advantest Instruments?
I am looking for some help and advice with regarding to Error +337

Please Help,
coldframe.

[ManateeMafia]

Thanks for the pics. I have seen many Advantest units for sale but have stayed away from them due to a lack of service manuals.

One of the pictures shows a bunch of power supply test points. I would scope all of those to start. It appears that one of the caps has been replaced. It is just above the +15VP test point and is different from the others. Perhaps someone was chasing the same problem?

If you could run through the performance test and post the results, it might give someone an idea which ranges are affected and whether it is a calibration issue or hardware failure.

[coldframe]

Hello, ManateeMafia
That is absolutely correct 
I came across this in a someone was chasing or repair evidence & Check Results (See Attated Photo)
more Specific Photo Uploaded https://www.flickr.com/photos/119902516@N06/sets/72157656157145255
I will try your advice
Please Let me know if you require any further information
Thanx ManateeMafia,
coldframe

-15VF, -15VP

Thanks for the pics. I have seen many Advantest units for sale but have stayed away from them due to a lack of service manuals.

One of the pictures shows a bunch of power supply test points. I would scope all of those to start. It appears that one of the caps has been replaced. It is just above the +15VP test point and is different from the others. Perhaps someone was chasing the same problem?

If you could run through the performance test and post the results, it might give someone an idea which ranges are affected and whether it is a calibration issue or hardware failure.

[ManateeMafia]

It looks like all the inguard voltages are generated on the board mounted on the bottom. It also looks like the same voltages are going to the smaller board that is mounted above the fan.

Is it possible to test the +/- 15V with connector unplugged? I don't see any other connectors or inputs going to that board.

Also, if you have a scope, you can measure any ripple on those rails. I see several Warning High Voltage stickers. Without a service manual, it will be tricky not knowing what to expect on that board. I would trace back the inputs to whatever bridge rectifier is supplying the regulators with the power off, make a diagram, and then troubleshoot without having to guess. It looks like one of the bridge rectifiers may have overheated. It is difficult to read the markings on the one below the large caps.

Unfortunately, there doesn't seem to be a source for the maintenance manuals for most of the Advantest products.

[coldframe]

Hello ManateeMafia

Good News
5V Voltage Drop I  know why (Attatched Photo #1)
Then suddenly, there is a changed ERROR Code (Photo #2)

Bad News
There is expected, as you say, Just a little accident (-139V Short!  Photo #3,#4) 
Don't worry I'm Still Alive 

BTW, I've got to run in to work. see yo this weekend i will Fllow up your advise (measure any ripple,  more detail Power Supply module
Photo etc..) I appreciate your interest.  Stay tune.
English is not my native language, hope for understanding.

Thanks,
Coldframe

It looks like all the inguard voltages are generated on the board mounted on the bottom. It also looks like the same voltages are going to the smaller board that is mounted above the fan.

Is it possible to test the +/- 15V with connector unplugged? I don't see any other connectors or inputs going to that board.

Also, if you have a scope, you can measure any ripple on those rails. I see several Warning High Voltage stickers. Without a service manual, it will be tricky not knowing what to expect on that board. I would trace back the inputs to whatever bridge rectifier is supplying the regulators with the power off, make a diagram, and then troubleshoot without having to guess. It looks like one of the bridge rectifiers may have overheated. It is difficult to read the markings on the one below the large caps.

Unfortunately, there doesn't seem to be a source for the maintenance manuals for most of the Advantest products.

[aronake]

Very old thread, but did you manage to repair this? I have same unit, with same error, but in a lower range.