Marantz m cr611. Switches off. No stby.

[Fritter]

Hi
Bit of a weird one. Unit will only stay on for a few minutes and functions correctly while it's on. Output to speakers normal. Then switches off. No power, no standby, unit is dead. 10 minutes later, it can be turned back on and functions normally again. It's not generating any heat. Has anyone seen anything similar ?

[R_J]

Re: Marantz m cr611. Switches off. No stby.

Could be that the standby is failing, download the service manual and check the voltages. C874 or C873 could be bad.

[Fritter]

Re: Marantz m cr611. Switches off. No stby.

When it power on after shutting down, its on standby and will switch on. Will check them tomorrow. Thanks

[R_J]

Re: Marantz m cr611. Switches off. No stby.

The standby circuit produces P_VCC_IN for the other circuits in the power supply, so if the standby circuit shuts down, the rest of the unit will as well. and since the standby circuit is operating 24/7 I would suspect it first.

[petehall347]

Re: Marantz m cr611. Switches off. No stby.

first check wiring in the mains plug .. had similar a few years back with loose wire .

[Fritter]

Re: Marantz m cr611. Switches off. No stby.

Pulled it apart. First inspection looks like caps open and ice3br1765j is fried. Scorch marks on bottom of board.

[R_J]

Re: Marantz m cr611. Switches off. No stby.

If the unit is still turning on, the ic should still be ok, just replace the caps and re-solder the ic pins. The IC is running all the time and does get hot, so over time it discolors the board
It is possible there are poor connections on the ic that were causing the ic to shut down. Inspect all the connections on the power supply board such as the transformer and the other ic's etc.

[Fritter]

Re: Marantz m cr611. Switches off. No stby.

Thanks for the help. Both drain connections look rough. I’ll re flow most of the hot side and see where we are ��

[Lordt]

Re: Marantz m cr611. Switches off. No stby.

Hi
Bit of a weird one. Unit will only stay on for a few minutes and functions correctly while it's on. Output to speakers normal. Then switches off. No power, no standby, unit is dead. 10 minutes later, it can be turned back on and functions normally again. It's not generating any heat. Has anyone seen anything similar ?

I'm just experiencing exactly the same for the first time. I'll try the same fixes. any tips gratefully received, as I've not opened the set up yet?

[Fritter]

Re: Marantz m cr611. Switches off. No stby.

I'm just experiencing exactly the same for the first time. I'll try the same fixes. any tips gratefully received, as I've not opened the set up yet?

It's not too bad to pull apart. Power supply is the bottom board. I'll pass on anything I find.

[Lordt]

Re: Marantz m cr611. Switches off. No stby.

Found exactly same scorch mark so reflowed just those dry looking pins. The large cap looked fine and tested OK, so left it. It still shuts off from standby. Very disappointing

[Lordt]

SUCCESS!! replaced the ICE chip and it works perfectly. thanks Fritter for great suggestions. Had to buy 10 chips - can I send one to you? if so send address to tom@tomwilkinson.com