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HP9114B Battery problem



#4

I have a battery for the 9114B disc drive that is somewhat of a problem. Although the battery was replaced and charges with the AC adapter, I cannot get any voltage to the plug that connects to the drive. I remember someone describing a fuse that was soldered onto the pcb as the problem. What I have done to correct the problem is hardwire the battery output directly to the plug that connects to the drive. This appears to bypass the voltage regulator circuitry and may be a problem when using the battery with the charger. Does anyone have any ideas?
Thank you,
Dale


#5

As we speak I'll open up my battery and see what the story is.

But while I do here's a few points to ponder.

1) there's a fuse in there for a reason. Jusa as I don't suggest replacing house fuses with 3 inch nails, I also don't suggest bypassing this fuse.

2) I would generally consider it a bad idea to modify a circuit until you know what it does.

OK, now I've opened up the 88014B power pack, I note the following.

1) There's no obvious fuse in mine!

2) There is a component on the board that *could* be a fuse, but it's in the wrong lead. It's the beige component with a single black stripe next to a diode, next to a power transistor. This is in the charging circuit.

(Yum, just went and had breakfast)

3) The +ve lead goes through the regulator board. It appears that the +ve straight from the battery goes to the ground plane of the PCB. So it's not easy determining where the +ve from the battery mets up with the +ve to the connector.

4) there's only a limited number of high current tracks on the PCB, so there's only a few components...

Aha! Check the green component just to the left of the connector (board viewed so you can read the part number). This has stripes red (thick), red, black, green (hard to see). This appears to be connected to the ground plane at one end and to have a very low resistance (0.1 ohm?).

By the way, my board is marked 09114-66512 REVA

So, there's 2 things that *could* be fuses, both on high current pathways, and both with very low resistances. If you unit charges, then I'd suspect the one to the left of the connector.

#6

I looked at my 9114B battery (model 88014B, circuit board is labelled 09114-66512 REV A) and I see one component just to the right side of the 5 connector pins which is marked 5A. I think it's a fair bet that this is a 5 Amp fuse.

I agree that short circuiting the battery pack directly to the DC output may be a problem during charging. I don't know for sure; I haven't traced the circuit (this teenie board seems to be a multilayer PCB!) but there are way too many transistors there for merely charging a lead-acid battery :-)


Viktor


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