#10 HAMEG HM307 Repair
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- Опубліковано 9 лют 2025
- HAMEG Scope HM307-4 Repair. Little scope from the late 70ies. One channel, bandwidth is more than 10MHz, triggerable. CRT in the scope version -4 is C312P1 with 1800V instead of 3RP1A with only 1kV in older versions of the HM307.
Yes, years ago, beginning electronics, I bought an very new HM203, 20MHz. It was the best I could afford. The trace of tube is absolutely sharp and clean. Bandwidth is perfect when you learn electronics. Nowadays, I am using as an amateur high end Tek scopes bought on Ebay….
After 3 years I'm back to watch this video again. I have a new appreciation for it and garnered even more GR8T insights. It's really outstanding. All of this is going on my resume. I'm going back to my electronics trade school and demanding my money back! Oh Snap! p.s. I ♥that little scope. I think others might have not saved its life. Thanks again.
Tnx! Yes, i also think that many of these scopes are butchered or scrapped. It´s a pity!
This is such a nice little scope.
Got one cheap, and it is always my go to scopy for simple quick waveform inspection
I really prefer the analogue displays - clean and crisp
True! Good for beginners without overloaded menues
I loved the way you teared (tore) down and repaired the vertical sensitivity panel. An old hand with fantastic experience can only do a clean perfect job. Thank you for the video. Fantastic restoration!!!.. by the way you remind me of my Master who thought me Valve Radio Electronics
Thanks dear Luther
Cool little oscilloscope!
Really outstanding repair video 👍😁 Thank you for inviting us along on one of the most interesting repairs I've seen to date. Very impressive skill set, sir. Cheers 🇺🇸 oh! SUBBED 🤗
Wunderbar!!! Ausgezeichnet!!!
Best CRO repair on youtube! I not only enjoyed it but picked up a few tips.
I have an old HM 208 in excellent condition. I love it.
Subscribed.
Thanks, but there are some other guys here with very good vids….
Awesome work Stefan! Great repair I really enjoyed watching it! Thank you for sharing! Frohe Weihnachten!
Thanks for your nice comment. Also the Best for next year
Ich kann nur sagen: Wahnsinn ! Wieviel Zeit und Herzblut Du in die Reparatur gesteckt hast ! Ich dachte, das nimmt gar kein Ende mit dem versteckten Fehlern. Und dann auch noch das ganze Gerät total zerlegt. Das HM307 war mein erstes Oszilloskop. Ist gute 40 Jahre her. So wie Du hab ich mir dann später auch ein etwas besseres (digitales) 2 Kanal Hameg Scope gegönnt. Hab mal ein ABo dagelassen und natürlich nen Daumen hoch ! 73 de DL1LAJ
Besten Dank dr OM!
I have 2 of these, both were operational about 12 years ago, but now they have issues when dug out of storage - one shows a small area on the screen, BRT and Focus work, X,Y don't. Other has no CRT light up, but the front panel LED comes on (sigh). The ones I have are early models, with the CRT at 1Kv nominal. I'm watching your post to see if something comes up to help me troubleshoot. I do have the original manual that came with them - superior to those shown online for download, with full size boards, and fold out schematics.
Update: Found C350 (1uF 50V Tant) was shorted, pulling down the +24V - removed, now operational, but intensity adjust does not swing to off. So more to go.
Hi Paul, seems, you´re on the right way.
These scopes are simple and easy to service, look also at the transistors in the intensity control - i had a faulty transistor there as shown in my video.
Very nice video ...professional way to check the voltage with scope .cuz dmm not show the ripple
Nice work.... Thanks
Really interesting. Can you actually be touching the crt with the power on like that? Also, your hand is really close to the ground clip of the probe on the chassis when taking the high voltage measurement ... is the high voltage probe protecting you overall if you were to touch the ground clip? Thanks.
Ground is ground and the scope and CRT outside shielding is grounded! So no problem
@@dl7majstefan753 Thanks for that; and there is no isolation transformer involved here on either scope?
The Philips-scope has no grounding, it´s inputs are isolated against the power line ground (two prong connector only). It is connected to the ground of the Hameg scope.
first time here and i like it...
You´re welcome - stay tuned!
I love this old HM307! Its component tester is extremely handy for checking transistors in circuit! For troubleshooting audio equipment for example, it is a great tool.
I lost the blue cap (with arrow) of the trigger level. It seems to be a Ritel 3010135, but if I want to buy one from Ritel, it's going to cost me 70€ with order and shipping fees!
Does anyone know where I can find one?
Don´t have, but i would buy TWO new knobs with blue pointer inlay for Level and Variable. So you have optical continuity and one original knob spare, you can sell for 70€ now...:-)))
Very interesting and informative. vielen Dank.
Hi just brought one of these hamegs, just wondering if u could help when i put the probe on the calibration point i do not see any square wave. I do get a trace when not on calibration
Look at the settings of the timebase, the Y-Amp and the trigger point.
@@dl7majstefan753 thanks i managed to get it to produce the calibration trace. Scope seems a bit noisy so think i need to clean switch contacts
@@MrAppleimac01 Bad contacts are always a topic!
Prima Job!!!
Ich lag falsch - ich hätte gedacht, daß einer der Kondensatoren ab einer gewissen Spannung durchschlägt.
Zu den Dioden: Ich würde da ja weiterhin 2 Dioden in Serie reinbauen, auch wenn du das aus Gründen der Spannungsfestigkeit nicht brauchst. Aber falls mal eine Diode durchlegiert, gibt dir das zusätzliche Sicherheit, die Platine wird auch für 2 Dioden in Serie ausgeslegt sein, und Dioden kosten ja nix.
Übrigens: Den kleinen Hochspannungsgenerator finde ich extrem spannend! Genau das Richtige, um Kondensatoren im Verdachtsfall auf Isofehler bei hohen Spannungen zu prüfen! Gibt es da einen Schaltplan?
Ich habe übrigens auch noch zwei so kleine Hameg 1-Kanal Oszis, und habe schon länger geplant, einen davon mal umzubauen zum Carlsons Curve Tracer... Mal schauen, wann ich das mal mache!
Danke; Schaltplan des HV-Generators: Mein Video zeigt den Aufbau:
ua-cam.com/video/hLx2Qwq1lGQ/v-deo.htmlsi=vat_Gn2o4yn_5CZk
Wow, great job
Very interesting.
Thanks!
Hi sir you explained very good thanks .just i cant find diode dor my crotech3132 osciloscope ,its RY16LC diode .the caps are 1200,what kinds of diode should i use instead of them for example any diode 1000v can i use?
The datasheet: www.oemsemi.com/ic/RY16LC/385647.html states a reverse voltage of 12kV!! 1kV is not sufficient. I think any 12kV diode should be sufficient, but i don´t have a type for you - sorry
Ok thankyou very much .in my country has no diode 12kv but if i found 2kv 1 amper diodes i put the in series 6 of them and will get 12kv 1 amper .insulation is need of course .thankyou
@@stepback4527 Should work but look for identical diodes.
good video , tnx
Die Dioden waren schon immer in der Hochspannung eine Fehlerquelle. Die Helltastung in der Hochspannung war dann auch oft kaputt.
Ansonsten gute Arbeit 👍🏻
@@marcuszanetti340 Danke!
sind sie aus Bayern?
Bana hamek hm 103 şema atabilirmisin
hi can you send me hameg hm 103 diagram
Please look here:
elektrotanya.com/hameg_hm103_oscilloscope_um.pdf/download.html
or:
cdn.rohde-schwarz.com/hameg-archive/HM103_deutsch.pdf
Look for the version of the scope.
TÜRKÇESİ