Re: Color Cells CC784 Repair & Restoration Log
So yes, it uses a transformer to pull the mains down to 9.5VAC at 4.2A, then there is a rectifying bridge on the main board after....
Sheeshbajeesh
New Member
Last Activity: 12-10-2021, 02:49 AM
Joined: 11-04-2021
Location: Choctaw
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Re: Color Cells CC784 Repair & Restoration Log
Modifications finished, here is the end result:
The voltage across the battery leads live is 0.50V. And it seems to be keeping memory so far..
Although it has an issue where the set time does not progress. This issue was present before the battery modification, not sure how or if this can be repaired.
But the unit seems fine other than that. Thank you all for the help!
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Re: Color Cells CC784 Repair & Restoration Log
Excellent thank you for the help. I'll report back in my success!Leave a comment:
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Re: Color Cells CC784 Repair & Restoration Log
Awesome, assuming the cathode of the schottky facing towards D3 and anode towards the positive terminal on the new battery holder.
Assuming a common 1N4148 diode work well enough?Leave a comment:
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Re: Color Cells CC784 Repair & Restoration Log
I understand it was quite awhile ago. 2015 I think was when the OP was made lol. I am not quite sure which IC is the RAM.
I attached some full shots of the board, as well as images cropped in on the battery circuit with a few annotations:
I hope this will help jog your memory.
The Volt reading before R4 across D3 is 5.1VDC, and after R4 steps it down is around 4.4VDC. This is the resulting potential at the battery terminals.
So what you...Last edited by Sheeshbajeesh; 11-05-2021, 03:42 PM.Leave a comment:
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Re: Color Cells CC784 Repair & Restoration Log
Did this fix work? I noticed that R4 does not seem to be in parallel with D3... Which means that the path of R4 is the only continuation from the positive terminal of the battery. One would need to jumper in place of R4 to complete the circuit.... Doesn't seem right....Leave a comment:
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Re: Color Cells CC784 Repair & Restoration Log
I'm working on removing the NICAD from mine as well and doing this battery mod. The resister to be removed is R4 on the main board, correct?Leave a comment:
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