KIKUSUI cos5020 Scope Service Manual Urgently needed

Reactance · 19th March 2010, 03:16 PM

Hi

I have a KIKUSUI cos5020 20Mhz scope and its really acting funny when measuring signals and setting the time base to anything over 20ns > to get a better view of a wave dv/dx it cannot get a lock on the wave and just goes wild like the time base is messed up

KIKUSUI cos5020 20Mhz (Not mine just in case you wanna know what it looks like)

Does anyone have an idea where i can find a Service Manual for the scope i really will appreciate anyone’s help even a guide as to why the scope is behaving like this ive tried everything

P.S i wish i had cash for another scope but i just dont have they too expensive so i have to work with this one.

Thank you in advance.

Matt.B.H. · 22nd March 2010, 12:09 AM

looks idenical to the TRIO/KENWOOD scopes.

Cheers Matt.

Algar_emi · 22nd March 2010, 01:08 AM

I used to work on scopes like this long time ago (we maintained more than 2300 different models of test equipment at the time) and they were nice scope when they were working

They were meeting their specifications by the teeth, unlike TEK, and some of the switches (attenuator and time base switches) were already intermittent 20 years ago. It is likely the case with your problem.

Matt.B.H. · 23rd March 2010, 10:29 PM

I agree completely, they are not bad 20Mhz scopes.

I repaired/overhauled a pair of them for a chap about a year ago. The switches are normal consumer grade stuff of 20 or so years ago. I had to remove the whole front panel and desolder all the switches seperately to give them a good clean.

One of them had been fiddled with and it took a bit to get the attenuators back in line, someone had added additional variable caps and resistors of probably at least 50 years vintage. Nice. Ive got some photos around here somewhere..... Just looked only photos of the bent cases and handles after DHL had them.

The trigger on them is a bit strange if your used to TEK or HP stuff. I would say your fault is almost definately dirty switches. Its not too bad a job just takes a while.

Cheers Matt.

19th March 2010, 03:16 PM	#1
Reactance diyAudio Member Join Date: Jun 2005 Location: Cape Town	KIKUSUI cos5020 Scope Service Manual Urgently needed Hi I have a KIKUSUI cos5020 20Mhz scope and its really acting funny when measuring signals and setting the time base to anything over 20ns > to get a better view of a wave dv/dx it cannot get a lock on the wave and just goes wild like the time base is messed up KIKUSUI cos5020 20Mhz (Not mine just in case you wanna know what it looks like) Does anyone have an idea where i can find a Service Manual for the scope i really will appreciate anyone’s help even a guide as to why the scope is behaving like this ive tried everything P.S i wish i had cash for another scope but i just dont have they too expensive so i have to work with this one. Thank you in advance. __________________ There’s nothing worse than the smell of burned output transistors!!

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22nd March 2010, 12:09 AM	#2
Matt.B.H. diyAudio Member Join Date: Jul 2009 Location: Cheltenham	looks idenical to the TRIO/KENWOOD scopes. Cheers Matt.

22nd March 2010, 01:08 AM	#3
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	I used to work on scopes like this long time ago (we maintained more than 2300 different models of test equipment at the time) and they were nice scope when they were working They were meeting their specifications by the teeth, unlike TEK, and some of the switches (attenuator and time base switches) were already intermittent 20 years ago. It is likely the case with your problem.

23rd March 2010, 10:29 PM	#4
Matt.B.H. diyAudio Member Join Date: Jul 2009 Location: Cheltenham	I agree completely, they are not bad 20Mhz scopes. I repaired/overhauled a pair of them for a chap about a year ago. The switches are normal consumer grade stuff of 20 or so years ago. I had to remove the whole front panel and desolder all the switches seperately to give them a good clean. One of them had been fiddled with and it took a bit to get the attenuators back in line, someone had added additional variable caps and resistors of probably at least 50 years vintage. Nice. Ive got some photos around here somewhere..... Just looked only photos of the bent cases and handles after DHL had them. The trigger on them is a bit strange if your used to TEK or HP stuff. I would say your fault is almost definately dirty switches. Its not too bad a job just takes a while. Cheers Matt.