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2465B with no trace

Saroj Pradhan All Messages By This Member #17154 Hi I recently acquired 2465B. At power on the self test passes with no trace.? Short description about the scope: It has serial no b065557 It has smd in A5 board. ? After searching in the net I came across a point that adjusting grid bias trace can be made visible. Accordingly I got the trace with following issues : Intensity control has no effect.? Focus control has effect.? Read out intensity has effect Scale illumination works CH1 and CH2 vertical position can be changed within only one division mark while CH3 and CH4 vertical position can be changed from lower to upper side.? Screen frame is shifted 1division Below. ? And one more thing in the first quarter of the screen there is a message: A1 - 02 v?? This number changes according to the position of CH1 volt/div switch I have the service manual downloaded. I? have been going through manual for last few days.? If some body has idea where where to look for the fault. By the way I wsa able to fix my 2230 5 years back using this group. Thank? Leo once again your patience and support.? ? ? ? ? ? ?
Saroj Pradhan All Messages By This Member #17160 Hi every one!? To day I verified the low voltage power supply at j119. The all the voltages are within the limit. Visually all the electrolytic capacitors looks good on both power supply and A5 control boards. There is no sign of leakage. Ripples are within limit.? Today when I power on the scope self test stuck at add led.(it did pass self test yesterday) The message was TEST 05 FAIL 24 I search this test fail message on the net to find the possible cause. Everybody suggest to look into A5 control board specifically DAC312 and srounding baising component and leaky electrolytic capacitor. In my case there is no leaky capacitor, board looks fresh no Track damage. Measuring the DC voltage at Vref pin 14 and 15 of U2101 I found that? Vref voltage are in the mv range around 145mv. Do some one came across same situation? Please guide me to rule out problem in A5 board.? Thanks
Roger Evans All Messages By This Member #17161 Go to the 'other' group ie TekScopes rather than TekScopes2 and search on ' 2465b a5 board repair' and '2465b dac reference'.? Most of the front panel controls on the 2465 just set voltages which are read by the CPU and a ADC.? The real work is done by the DAC and a set of sample and hold circuits which drive the X and Y amplifiers, time bases, trigger circuits etc.? If the DAC reference voltages are wrong then almost everything misbehaves.? Don't be tempted to change the preset controls until you have fixed the DAC references, you will need to recalibrate later!? (resetting just the CRT grid bias is quite straightforward) ? Your symptoms are typical of corrosion damage on the A5 board following leakage of electrolyte, resistors change value or go open circuit, PCB traces and vias? get damaged, and maybe other things.? You need to look carefully at the A5 board with good lighting and a magnifying glass or eye glass if you have one.? Also check the posts that you will find in TekScopes for the points where you can check the DAC references. ? Best of luck, ? Roger
Saroj Pradhan All Messages By This Member #17162 Hi Roger Thanks for your kind response.? OK I will go there. Could you tell me how do I get there? Is it totally different site? Regards Saroj?
Roger Evans All Messages By This Member #17163 /g/TekScopes, it was the original TekScopes group and TekScopes2 is a later offshoot. ? Roger
Froggie the Gremlin All Messages By This Member #17164 Hello, 0/ get full service manual for your model and serial 1/ be sure all LVPS are correct V and noise, hum in spec 2/ on 2465B check A5 control bd for leaking SMD electrolytic se damages. 3/ check beam finder button, HV, CRT ckt for usual, HV mult, transformers, high value resistors resources 开云体育, tekscopes and tekscopes2 EEVblog search 2465 teardown 80 pages,of,tips, repair, recap Condor Audio in Israel, recapping kits and assistance Vintage Tek, Beaverton Bon chance Jon
Saroj Pradhan All Messages By This Member #17165 Thank you Roger for the information
Saroj Pradhan All Messages By This Member #17166 Hi Jon? Thanks for the info.? By the How can I get the manual from you? Regards Saroj
Froggie the Gremlin All Messages By This Member #17167 Hello again dear Sir, See W140/ tekwiki for all Tektronix manuals in PDF Also the Vintage Tektronix Museum Manual you need is service, for the the serial number and exact model, options Artek has printed reproductions. Cost - 40-80$ Ebay may have originals, but seldom and costly. We DL the PDF,and print sections as,needed Follow the troubleshooting flow charts. Enjoy Jon
Saroj Pradhan All Messages By This Member #17168 Dear Jon Thanks for your response. I had downloaded the manual from the site manualslib couple of days before and downloaded the manual from the site you described. It seems little difficult to follow when it comes to schematic and assembly drawing section. I understand the manuals are downloaded free of cost and cannot hope for better as originals. Regards Saroj toggle quoted message Show quoted text On Thu, Mar 13, 2025, 8:47 PM Froggie the Gremlin via <jonpaul=[email protected]> wrote: Hello again dear Sir, See W140/ tekwiki for all Tektronix manuals in PDF Also the Vintage Tektronix Museum Manual you need is service, for the? the serial number and exact model, options Artek has printed reproductions.? Cost - 40-80$ Ebay may have originals, but seldom and costly. We DL the PDF,and print sections as,needed Follow the troubleshooting flow charts. Enjoy Jon
David C. Partridge Member Profile All Messages By This Member #17169 开云体育 You can DL the 2465B manual direct from tek.com and that is a very high-quality PDF. ? D. ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Saroj Pradhan via groups.io Sent: 14 March 2025 01:29 To: [email protected] Subject: Re: [TekScopes2] 2465B with no trace ? Dear Jon Thanks for your response. I had downloaded the manual from the site manualslib couple of days before and downloaded the manual from the site you described. It seems little difficult to follow when it comes to schematic and assembly drawing section. I understand the manuals are downloaded free of cost and cannot hope for better as originals. Regards Saroj ? On Thu, Mar 13, 2025, 8:47 PM Froggie the Gremlin via <jonpaul=[email protected]> wrote: Hello again dear Sir, See W140/ tekwiki for all Tektronix manuals in PDF Also the Vintage Tektronix Museum Manual you need is service, for the? the serial number and exact model, options Artek has printed reproductions.? Cost - 40-80$ Ebay may have originals, but seldom and costly. We DL the PDF,and print sections as,needed Follow the troubleshooting flow charts. Enjoy Jon
Saroj Pradhan All Messages By This Member #17176 Hi David Nice to hear that I will try to download Thanks for info.? Regards Saroj On Fri, Mar 14, 2025, 10:12 AM David C. Partridge via <david.partridge=[email protected]> wrote: toggle quoted message Show quoted text You can DL the 2465B manual direct from and that is a very high-quality PDF. ? D. ? From: [email protected] <[email protected]> On Behalf Of Saroj Pradhan via Sent: 14 March 2025 01:29 To: [email protected] Subject: Re: [TekScopes2] 2465B with no trace ? Dear Jon Thanks for your response. I had downloaded the manual from the site manualslib couple of days before and downloaded the manual from the site you described. It seems little difficult to follow when it comes to schematic and assembly drawing section. I understand the manuals are downloaded free of cost and cannot hope for better as originals. Regards Saroj ? On Thu, Mar 13, 2025, 8:47 PM Froggie the Gremlin via <jonpaul=[email protected]> wrote: Hello again dear Sir, See W140/ tekwiki for all Tektronix manuals in PDF Also the Vintage Tektronix Museum Manual you need is service, for the? the serial number and exact model, options Artek has printed reproductions.? Cost - 40-80$ Ebay may have originals, but seldom and costly. We DL the PDF,and print sections as,needed Follow the troubleshooting flow charts. Enjoy Jon

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