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Re: Baofeng CH1801 charger for DM-1801 DMR radio


 

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I have the same prob.? Annoying, but the charger still charges.

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From: [email protected] [mailto:[email protected]] On Behalf Of Ken K
Sent: Wednesday, July 28, 2021 9:22 AM
To: [email protected]
Subject: [Baofeng] Baofeng CH1801 charger for DM-1801 DMR radio

?

I have a charger from day one while charging has never switched from the charge mode (RED LED)
to the COMPLETED CHARGE (GREEN LED)?? It appears to charge the battery.? After a few hours
I have a battery charged to around 8.3 volts.

The charger uses a HXN-WS chip.? The other number on the chip looks like e4969 or e4959.?? i still could be wrong.

So far all the electrical connections seem to be good based on using an ohm meter
going point to point.???

Anyone else come across this problem???? I have a friend who purchased a DM-1801 with CH1801
charger and his works perfectly.?? His circuit board and mine look identical except his chip looks like
it could be a HXN-WS e4975.??? Searching everywhere I could not find this IC but did find plenty
of HXN-WS with different eXXXX numbers.?? Schematic looks identical to what 's called a SC6038 except
on mine pins 7 (CS), pin 1 (VIN) and pin 6 (EN) are all tied together.?? The SC6038 circuit shows a R6 10K resistor
in series with pin 6.?? Pin 6 (EN) needs a high to turn on the chip so I don't think its an issue with a direct
short to VIN.?? It appears to charge so it must be turned on.

With no battery but charger powered up it's my understanding it's suppose to flash
RED/GREEN with the LED.? Mine only flashes RED.

At this point I am thinking a defective IC since it appears to never switch from CHARGE to
COMPLETE.

Interested in hearing any comments.??? I was thinking of just scrapping the circuit board and go with
a TP5100 board.?

Ken

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