HAMEG HM 303-6 Service Manual - Page 1
Forum section: electronics / testgear

author: Jesper
author_rank: Newbie
timestamp: March 25, 2013, 09:26:08 pm
content: Hi,Does anyone have a pdf of the service manual for HAMEG HM 303-6 ?I accidently knocked off two components, as I was remounting the shield after I re-soldered the CH2 BNC. Doh..I think its two 220 Ohms pots, but I'm not sure as the marking is 22nplease see attached image. I need to replaced them, and adjust the circuit.Thanks in advanceJesper

author: Fraser
author_rank: Super Contributor
timestamp: March 25, 2013, 11:13:00 pm
content: You can measure the trimpots across the carbon track to find out the value. The type is a common cermet and nothing special at all. Setting up the circuit will be in the service manual so you do need it.You are fortunate. You own an oscilloscope from a manufacturer who is actually willing to provide service manuals free of charge by email. I used to sell Hameg equipment...a high class firm to deal with.Hameg used to provide the schematic at the rear of their user manuals but that stopped for reasons not known to me, but could be due to the R&S take over. Whenever I buy a piece of Hameg equipment I always contact Hameg Customer Support and ask for the service manual (I did this with my HM305 which is similar to your unit) Hameg have always sent me the full service manual by return email. As the HM3xx series is quite old there isn't really an issue with providing the service data. I would not expect the service manual for the latest models to be available to the public. Sadly the HM3xx series CRO's do not have the greatest reputation for long term reliability but most faults are simple to repair. The earlier HM2xx series are built like outside toilets and seem to last forever.Send customer support a nice email and all should be well.http://www.hameg.com/service_main.0.html?&L=0Kind RegardsFraser

author: Jesper
author_rank: Newbie
timestamp: March 28, 2013, 11:01:11 pm
content: Thanks for your reply..I wrote a nice email to Hameg support as you suggested. Don't know why I didn't think of that in the first place.I got a reply saying that the person responsible first will be back in office sometime next week, and that I will get a reply when he/she is back. So now I'm waiting patiently :-)Kind regardsJesper

author: PushUp
author_rank: Regular Contributor
timestamp: August 10, 2016, 09:27:59 am
content: old Thread => old ScopeHi Jesper,did you get any helpful information by Hameg?As far as I am concerned, they gave me a link to a repair-shop, which wasn't helpful at all.Nevertheless, my scope is fine, but just in case I have to tune it a little bit, it would be nice to have a service manual newer than the 303-5, which you can get here for free:http://www.opweb.de/en/manufacturer.php?manufacturer=HamegAny hint or link is appreciated.Best wishes!

author: sangokaz
author_rank: Newbie
timestamp: November 16, 2017, 12:57:45 pm
content: Hi All,Please help me with HAMEG HM303-6 service manualI have some problem with Old Hameg HM303-6 and looking for service manual. even try to get help from Hameg/R&S customer support but unfortunately...I find only the Hameg 303-5 service manual on the internet space but this model have quite a different schematics.The problem with my Hameg is CRT, No beam/image. everything else seems like works.And without the schematic I don't want to risk with measurement in HV part.I tried to change Optocoupler CNY17-2 which is on the power supply board, but nothing changes, Checked all transistors in the power supply and CRT board. seems like they all is OK.No burned components, "cold soldering" problems, or any other obvious defects. Anyway I need service manual or schematic for Hameg HM303-6 model. Guys if you have idea where can I get service manual for HM303-6 please share I will appreciate that.

author: oldway
author_rank: Super Contributor
timestamp: November 16, 2017, 01:41:30 pm
content: I have only documents about the base time board, I don't know if it could help....

author: arw
author_rank: Newbie
timestamp: March 19, 2019, 11:32:03 am
content: An old topic. I too searched in vain for the HM303-6 service manual.However looking at the HM305-2 service manual available online , search orhttp://www.mikrocontroller.net/attachment/133545/Servicemanual_Hameg_HM_305-2.pdfThe analogue sections seem to have been based on circuits from the HM303-6. ( or maybe vice versa)The CRT board is the same, the vertical input board uses the same basic circuits but laid out a bit differently. same resistor and component values etc. The timebase board looks the same too.

author: paulbt
author_rank: Regular Contributor
timestamp: May 26, 2020, 01:59:41 pm
content: Hello, guys!Here you have all the schematics from the service manual for Hameg HM303-6. The password is "elforum".http://mikroelectronica.ro/elforum_upload/HAMEG%20303-6/HAMEG%20303-6.zip

author: graybeard
author_rank: Frequent Contributor
timestamp: May 26, 2020, 10:31:45 pm
content: This is great. R&S sent me a service manual pdf when I asked, but it did not include the schematics.Thank youChris

author: Fraser
author_rank: Super Contributor
timestamp: May 27, 2020, 10:55:01 am
content: Chris,Any chance of uploading the service manual pdf please ?Fraser

author: graybeard
author_rank: Frequent Contributor
timestamp: May 27, 2020, 04:29:14 pm
content: Hameg HM303-6 Service manual sans schematics

author: Fraser
author_rank: Super Contributor
timestamp: May 27, 2020, 05:54:18 pm
content: Thank youFraser

author: paulbt
author_rank: Regular Contributor
timestamp: May 28, 2020, 10:08:20 am
content: Super !Things start to gather up. Now we are missing only the layouts.

author: jvhb
author_rank: Newbie
timestamp: February 23, 2024, 08:47:50 pm
content: Hi, for anyone else that need it, here is the service manual PDF

author: jvhb
author_rank: Newbie
timestamp: February 23, 2024, 08:49:14 pm
content: And here the schematics in a 7zip file