I just got one Solartron 7075 When starting up, the output line 1400 will flash - Page 1
Forum section: electronics / repair

author: MuShan
author_rank: Contributor
timestamp: December 08, 2023, 05:19:41 am
content: Received a Solarton 7075. After repairing its power supply, it will output a line of 1400 when turned on. I switched the integration time, which can increase its number of digits. It shows that the self-test did not show a 7.0V reference voltageI don't have a good idea for checking anymore. I have some doubts about which reed pipes have problemsWhen pressing AC measurement, only the background light of V lights up, and the light of AC signal does not light up

author: MuShan
author_rank: Contributor
timestamp: December 08, 2023, 05:25:41 am
content: I hope everyone can give me some ideas for inspection

author: coromonadalix
author_rank: Super Contributor
timestamp: December 08, 2023, 11:32:46 am
content: find their schematicsyou have user manualhttp://www.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Solartron/Solartron_7075

author: MuShan
author_rank: Contributor
timestamp: December 08, 2023, 11:56:15 am
content: 我已经找到了它的原理图并且看过 干簧管好像是正常的今天我敲击PCB时出现了正常的显示I have found its schematic and have looked at the clarinet, which seems to be normalToday, when I was tapping the PCB, there was a normal display

author: tggzzz
author_rank: Super Contributor
timestamp: December 08, 2023, 01:29:56 pm
content: Quote from: MuShan on December 08, 2023, 11:56:15 amClean all the inter-board connectors, and reseat them carefully. They aren't the most reliable.

author: factory
author_rank: Super Contributor
timestamp: December 08, 2023, 02:41:54 pm
content: Mine had that problem too, it was working fine before I received it, but when it arrived it would only display even numbers and no one been inside since its last cal by Schlumberger, the board interconnection was causing it.David

author: MuShan
author_rank: Contributor
timestamp: December 08, 2023, 02:45:31 pm
content: When I just had a conversation with a friend, he told me that some very old multimeter PCBs and components may have water absorption, which may cause abnormalities It's interesting that I used a hot air gun to blow the positions of the two large relays on the board, which can now measure the DC voltage. I tested 100mV 1V 10V and 30V

author: MuShan
author_rank: Contributor
timestamp: December 08, 2023, 02:46:40 pm
content: I have dismantled it for observation, and the coating is very perfect. I have found a rough direction so far

author: MuShan
author_rank: Contributor
timestamp: December 08, 2023, 02:49:11 pm
content: It's very interesting. I used a hot air gun for heating, and now I can see that there is a reading of 10V

author: tggzzz
author_rank: Super Contributor
timestamp: December 08, 2023, 02:57:02 pm
content: Quote from: MuShan on December 08, 2023, 02:45:31 pmThe Solartron 7081 manual recommends that - after a long period in storage - it is wrapped in a thermal insulation and left powered for 24 hours. I used a blanket, and the stability did improve.

author: MuShan
author_rank: Contributor
timestamp: December 08, 2023, 02:58:14 pm
content: Now the area I am in is already at night. Tomorrow, I will dismantle it for heating and take a look

author: MuShan
author_rank: Contributor
timestamp: December 09, 2023, 03:11:20 am
content: Today I took it down and heated it up, but found that the effect was not good and it returned to its earliest state