Pls help me repair Tektronix TDS 380 - Page 1
Forum section: electronics / repair

author: chihaxinh
author_rank: Regular Contributor
timestamp: January 13, 2015, 03:07:40 pm
content: Hi AllI have one TDS 380 - Power up OK - when display power up - Seft test OK everythingBut when i go to diagnostic menu and run one test . I have Acquisition Error , pls see picture belowI a have another problem , i attach prober to sample signal , i don't see square wave in any CH1 or CH2 . But when i attach probe from another OSC to sample signal. Every thing ok - We have 5V square wave OKI give more information , show in diagnostic logIt's show many error about :- Save/recall memory error-diagAcq - acqMemData-diagAcq - acqMemPat-diagAcq - acqMemAddr-diagAcq - tbcDataRDBack-diagAcq - fastFisoAcq-diagAcq - fisoShortPipe-diagAcq - fisoCell-diagAcq - peakdetectAcqPls help me to check error and repair TDS 380, i open case and looking around , every ok , no resistor burn, no leak cap, every track and via ok . Solder pad, via look like new :|Sorry for my English , i live in VietNam and speaking english not well !Many tks you so much !Best RegardsNam Nguyen Hai

author: chihaxinh
author_rank: Regular Contributor
timestamp: January 14, 2015, 03:25:54 am
content: I give more information

author: tautech
author_rank: Super Contributor
timestamp: January 14, 2015, 04:43:40 am
content: Do you have the manuals?http://www.ko4bb.com/manuals/index.php?dir=Tektronix/Tektronix_-_TDS-380

author: chihaxinh
author_rank: Regular Contributor
timestamp: January 14, 2015, 06:38:50 am
content: @tautechYes, i have service manual . Could you have guide me how to check and repair TDS 380I see in mainboard block diagram , TDS have 7 block- Atten- Sample- Timebase- Display- Triger- Triger Time- CPUMy plant it's- Open case , cleaning pcb by compress air- Cleaning all componant contact by isopropyl Alcohol- Using compress air for dry and heatup mainboard by sun or glass bulk- Next step it's check all voltage provice for mainboard- Very carefully check contact of U204 in Sample Driver ( Attenuators Module)- Very carefuly check contact with Sampler module and Timebase .- Next step it's check clock generator in TimebaseAnybody have other suggestions?Many tks so much !Best regardsNam Nguyen Hai

author: xwarp
author_rank: Frequent Contributor
timestamp: January 14, 2015, 07:49:19 am
content: Other suggestions?Yes.Replace ALL the electrolytics if they are surface mount because the TDS 300 and 400 series have issues with those caps leaking and eating traces.I bought a TDS 460 a while back that failed aquisition and those caps were the cause.

author: chihaxinh
author_rank: Regular Contributor
timestamp: January 14, 2015, 08:05:13 am
content: Quote from: xwarp on January 14, 2015, 07:49:19 amHi xwarpI open case and see mainboard pcb , don't have any smd electrolytics capacitor exception 3 through hole capacitor near Hybrid Input module ( BNC input )C220 C219 C218 - Figure 9-11 A13 Mainboard - 220uF / ?VMany thanks you so much !Best regardsNam Nguyen Hai

author: leppie
author_rank: Frequent Contributor
timestamp: January 14, 2015, 08:18:19 am
content: I had a similar issue on my TDS340. Eventually just bought a TDS360 main board to replace it from ebay. Worked a charm

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 14, 2015, 04:18:08 pm
content: Had similar errors on TDS460. Replaced SMT electrolytic capacitors on all boards. Good as new.Can you open it up and take some pictures of the acquisition board?Tim

author: chihaxinh
author_rank: Regular Contributor
timestamp: January 15, 2015, 01:58:47 am
content: Buy new mainboard it's not my choiceHere it's picture mainboard of TDS 380 - Org , Org with caption and Mainboard TDS320 ( look like TDS380) . Picture i take on internet ( PCB have only 3 Electrolytic Cap in atten Module )Thank you so much !Best regardsNam Nguyen Hai

author: bingo600
author_rank: Super Contributor
timestamp: January 16, 2015, 07:09:58 am
content: Save Recall Mem Err ...Could it be the "Dallas" Battery Ram on the board ?What's the datecode on that ?/Bingo

author: chihaxinh
author_rank: Regular Contributor
timestamp: January 16, 2015, 07:32:05 am
content: Thank bingo600In to night i will take some picture and give you more information !Have you any suggestion about Fiso Error and MemData AddrI hope 3 Memory DRAM don't broken or die , finding part replacement so hard because machine very old ( >=20 years)Many tks so much!Best regardsNam Nguyen Hai

author: eva
author_rank: Newbie
timestamp: March 18, 2015, 03:32:40 pm
content: I've same problem !Help !!!@chihaxinh ( VietNamese ) : Không bi?t b?n ?ã s?a ???c ch?a, cái c?a tôi c?ng b? tr??ng h?p y chang ... có kinh nghi?m gì chia s? cho mình v?i. Mình loay hoay c? bu?i nh?ng ch?a tìm ???c gi?i pháp !

author: chihaxinh
author_rank: Regular Contributor
timestamp: March 19, 2015, 02:33:21 am
content: Hi Evamy email it's: namnh10@gmail.com. We can make private converstation, it's english 4rum and not comfortable to use vietnamese language in here.I replace ADC but not help , hope you can describle more detail about your error.

author: eva
author_rank: Newbie
timestamp: March 19, 2015, 05:03:52 am
content: Hi chihaxinhMy problem fixed ! ( For hardwork last night )... My TDS is same problem 100% , Remove AS7C164 ( SRAM Acquisition memory - by hot air ) , insert to new one. That's It !!!Maybe AS7C164 hard for find ... contact me, Email : dientuqueduong@yahoo.com ( Phu Thuy - Gia Lam - HaNoi ) , I used MB8464A-10L ( Fujitsu ) from Old industrial Computer Board, sent to you Free.Packake MB8464A more larger AS7C164 but fit OK with PIN Wrap ! ( and with access time 10ns ... performance good same as -12JC of AS7C164 ( I thinked) .(I will recalib my and Check more ( Power Failed ++ ) ( mistek repair last night ) . Boot up warning but work OK and trully work.

author: eva
author_rank: Newbie
timestamp: March 19, 2015, 05:11:26 am
content: Chihaxinh Contact me (Phone) : 090.496.4977 ( Que Duong - Que Duong Electronics ) if you want !

author: eva
author_rank: Newbie
timestamp: March 19, 2015, 05:44:47 am
content: After SPC test signal pass, ALL OK. My TDS like NewThanks ALL ! I'm verry happy !!!

author: chihaxinh
author_rank: Regular Contributor
timestamp: March 19, 2015, 06:07:26 am
content: Many thanks QueDuong ! I have one AS7C164 , tonigh i will replace and report for you !Very happy with your help !Many thank so much again !