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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