So one of my most detested repair scenarios, does anyone else dislike working on their own equipment. So I use this scope mostly for testing capacitors, relays and occasional testing of hot side switching PSU's and have had it for years it failed the other day which is an annoyance mostly since I like the scope's compactness and that it can be run from battery. Well the likely culprits included a leaking electrolytic and a bunch of really bad solder inc some split 100 nf caps see below although I have already started reworking the boards. It is now more or less functional besides the supply board putting out a lower voltage than expected. I am trying to source 6 tagged D cell rechargeable batteries for this, they all seem ridiculously over priced and I don't have a spot welder to attach my own tags
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Telequipment D34 oscilloscope
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Re: Telequipment D34 oscilloscope
The setup inside the scope is quite tightly packed, the D cells are arranged in two packs of three stacked side by side being clamped in place with insulated metal brackets. With each pack occupying a tight spot on each side of the tube. Anyways I have an appropriate set on order now which leaves the question of a DC short spot welder which I have developed an interest in building.
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Re: Telequipment D34 oscilloscope
Looking at the data sheets for these batteries the discharge curves etc and assuming they are not some cheap copy, they are high temperature and suitable for a discharge rate of up-to 4amps. So should be more than suitable, I can always check charging and discharge characteristics before final installation.
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Re: Telequipment D34 oscilloscope
Well it lives, packs have been installed and seem to be charging nicely, in operation as far as I can tell the discharge rate is around 1.4amps maybe a little less. This anomaly is to the way the packs are configured one bank of 5 cells at 6 volts and a single cell at 1.2 volts while this does not appear to be the case when referring back to the circuit with the battery pack shown as configured for one pack of 7.2 volts. I am not intending to investigate the discrepancy further.
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Re: Telequipment D34 oscilloscope
Yeah I measured around 200-300 ma charging current which is around that specified for the cells, I was concerned about the charging pcb since one of the failure modes encountered on this repair job was significant corrosion on the charging board and some corroded solder joints. This was likely related to the leaking electrolytic filter capacitor nearby. I had reworked most damage before getting around to take photos but if you look closely at the images you will see some of it.
I left the scope on charge over night to top off the new battery pack looking at bench meter I have 7.2 volts charging which seems reasonable. Due to the schematic showing always on its not my intention to leave the unit plugged in all the time.
Anyways I do like the JINHAO P6100 scope probes, they were obtained cheaply from Ebay, they seem to be of reasonable quality and hopefully not some knock off lol.
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