Topward 3603D Power Supply - Page 1
Forum section: electronics / testgear

author: janbo
author_rank: Newbie
timestamp: November 28, 2016, 05:02:57 pm
content: Looking for a schematic. Main board has parts that are gone.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: November 29, 2016, 03:37:11 pm
content: Topward seems to keep their SMs and schematics Top-secret.I have a schematic for the 6603A if that's worth anything to you. It is a 2MB pdf file... I'll try to attach it.I have a 6306D and most of the power and control circuits (but not the display) are identical to what is in that schematic.(Nope... even as a zipfile it is too large to upload.)

author: janbo
author_rank: Newbie
timestamp: November 29, 2016, 08:39:37 pm
content: Do you think if one would email to my email it would work?

author: Vgkid
author_rank: Super Contributor
timestamp: November 29, 2016, 09:21:07 pm
content: Quote from: alsetalokin4017 on November 29, 2016, 03:37:11 pmUpload it to k04bb, or split it into pieces.

author: janbo
author_rank: Newbie
timestamp: November 29, 2016, 10:50:55 pm
content: Can you try to send to.mail@lcheapo.netThanksRon

author: janbo
author_rank: Newbie
timestamp: December 02, 2016, 04:49:12 pm
content: Not much luck in getting a schematic for this so was thinking if I list the part numbers that are on the board I would be able to repair. I have 4-5 resistors and 4 transistors and one cap that are burned up. If someone could supply the value for these parts would be able to repair.Best RegardsRon

author: alsetalokin4017
author_rank: Super Contributor
timestamp: December 02, 2016, 05:09:30 pm
content: Quote from: janbo on November 29, 2016, 10:50:55 pmOK sent, check your mail

author: rbm
author_rank: Regular Contributor
timestamp: December 02, 2016, 09:55:37 pm
content: PM Sent.

author: janbo
author_rank: Newbie
timestamp: December 17, 2016, 04:59:50 pm
content: Thanks to all that sent schematics for my power supply but unfortunately none of them are close enough to repair the power supply.Any ideas?Best RegardsRon

author: AlfBaz
author_rank: Super Contributor
timestamp: December 17, 2016, 06:02:37 pm
content: Here's just the schematic page for my TPS4000. The complete file is to large to attach here so let me know if its any good to you

author: seronday
author_rank: Regular Contributor
timestamp: December 18, 2016, 12:39:25 pm
content: Circuit for Topward 3303D attatched.

author: janbo
author_rank: Newbie
timestamp: January 14, 2017, 07:13:07 pm
content: I have come to the conclusion this is the most keep secret Topward has. I have called sent emails to no avail so I have taken a picture of the board and mark the bad parts. Hoping someone has a board and can tell me the value and part numbers of the transistors and resistors.Best RegardsRon

author: shaunmorgan
author_rank: Newbie
timestamp: January 04, 2019, 03:01:02 am
content: 6303dhttps://drive.google.com/open?id=1Np-0bLnHynZsoiowED6gV_z_HTHF273h

author: coromonadalix
author_rank: Super Contributor
timestamp: January 04, 2019, 11:26:41 am
content: I see a rifa cap ?? wow the psu busted severly but it is repairable ..thks for the schematics, my friend has one, ill tell him to change the cap right away.

author: Smoke Bandit
author_rank: Newbie
timestamp: October 15, 2024, 08:27:17 pm
content: Hi, I have one of these Topward PSU's with the master circuit amp control clamped down not allowing the current limit to work. The op amp has been changed so now think it is in the control circuit for the amp. As above, following the circuitry is proving to be a mission. Any chance you could share your redrawn circuit again please? I cannot access page two where it is posted. Thanks and regards

author: floobydust
author_rank: Super Contributor
timestamp: October 15, 2024, 08:42:28 pm
content: I have this for Topward 6303D schematics

author: Smoke Bandit
author_rank: Newbie
timestamp: October 17, 2024, 04:45:39 am
content: Great thank you.