| Electronics > Repair |
| Tektronix TDS3BAT rebuild |
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| cunningfellow:
NiMh will die an early death if left constant trickle charging. They should be turned off at delta-peak. I will not be leaving this NiMh battery in the scope all the time. |
| Dave Wise:
How is the TDS3BAT charger wired? Is it a chip that can be jumpered to support NiMH? |
| cunningfellow:
Personally have no idea. I just did a battery swap and am happy to not have it on charge all the time. I rarely need it as a portable so just leave it out. I think from memory someone here has had a closer look at the battery and the protocol. |
| Dave Wise:
That might have been me. If by protocol you mean the comm between pack and scope, I once got knowledgeable enough on the TI BQ2050 gas gauge to decode it on my own scope, but it's beside the point, which is the charger. In the TDS3BATB that's a MAX1737 (high power) and a BQ2057 (low power). They could not have used that in the TDS3BAT because the BQ2057 is for Lithium only. |
| cunningfellow:
Sorry, Just popped it open to take some photos for you. Front of board has Battery Fuel Guage, Quad OpAmp, Linear Reg and a few FETs BQ2014 LP324 LM2936 4435 (Q2 SO8) 50WQ04 Back of board has µC, comparators and a large FET PIC16C54A LM339 LM339 M50P03 I am going to guess the charging is done by the PIC and I think because it has a C rather than an F in its name it is write once isn't it. Doesn't look like an easy mod to change the charging logic |
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