Roomba 550

[rifziyad]

Hi
my roomba 550 start flashing red circle when insert battery (full charged battery on another roomba)
cleaned battery contacts
no beep no function any button
no water damage
replaced 8mhz crystal

[TechGuy]

Your Roomba may have a defective D58.
http://www.robotreviews.com/chat/viewto ... &hilit=D58

[rifziyad]

thanks for your reply
its not charging problem because i have 3 good full charged battery and working roomba
the problem is when i insert battery its start red blinking whitout power button press and not stop red blink until remove battery
sorry for bad English

[a1robotrepair]

Your Roomba may have a defective D58

A shorted D58 could very well cause the clean light to pulse red or amber. It is the most likely device failure to cause this.

[TechGuy]

thanks for your reply
its not charging problem because i have 3 good full charged battery and working roomba
the problem is when i insert battery its start red blinking whitout power button press and not stop red blink until remove battery
sorry for bad English

Normally, Roomba blinks the Clean light in red or orange to indicate that it is in the high current charging mode.
The false charging state that Gordon was referring to in that thread is the "blinking red/orange clean light without plugging in your charger" This is exactly what your Roomba is doing.

Yesterday, I repaired a 530 with the same blinking red/orange clean light by replacing the D58.

[rifziyad]

just removed D58
still same. i did check diode with multimeter reading ok
i going to remove my working roomba and replace D58

[TechGuy]

...
i did check diode with multimeter reading ok
...

The D58, which I took out from the blinking orange clean light, was checked with a multimeter and it seems fine. But its leaky current will keep the Roomba blinking orange clean light.

[a1robotrepair]

just removed D58
still same.

Removing D58 would stop the CLEAN button from pulsing if it were the problem. There may be another short.

i going to remove my working roomba and replace D58

Why?!

Another reason the Roomba would think a charger is connected is Inverter U15 pin 10 is sourcing Sys_Rtn to the MCU.
This Drawing: http://www.robotreviews.com/chat/downlo ... &mode=view

[rifziyad]

thanku for replay and schematic
just disconnected pin 10 of u15
sadly still same
q18 short?

[a1robotrepair]

I can't tell you what the MCU will read on a floating input.
One would have wanted to measure the voltage on pin 10 U15, 0V charger connected, 5V no charger connected.

[a1robotrepair]

What was the bot doing before replacing the crystal osc.

[rifziyad]

on pin 10 U15 5.018 volt without charger connected

[rifziyad]

What was the bot doing before replacing the crystal osc.

Same problem
i thought its crystal problem i was wrong

[rifziyad]

removed q36
same problem
you have full schematic?

[a1robotrepair]

The next step would be to verify 5V on pin 32 of U28 without charger. After that, I would check all the regulated power, 5V and 8V.

[rifziyad]

there is 5 volt on pin 32 without charger

[rifziyad]

can you please guide me to check regulated 5 volt and 8 volt?

[rifziyad]

is there any full schematic for roomba 550?

[a1robotrepair]

The 5V should be checked with an O-scope @ L1 where it connects to C287, LC filter. It should show very little ripple.
8V @ U27, 78L08 TO92 pin 1 http://www.st.com/content/ccc/resource/ ... 000446.pdf

[rifziyad]

i have Rigol D1102E scope but i am not an expert on O-scope reading (still learning)
i will try to check and let you know in 30 minutes