KTS-MP400MR Marine stereo

[sundancer]

The wired remotes quit working two new ones don't work ether, must be the stereo,
I cracked open one of the old remotes and put 12volt & Gnd to it and it fired up. When the remote is plugged in the BU line on pin 6 of the connector drops from 12v to about 1.2v any of you sharp shooters want to look at the schematic and give me some direction I would appreciate it.

Thanks
Brad

[stj]

Re: KTS-MP400MR Marine stereo

check R424 10ohm resistor.

[stj]

Re: KTS-MP400MR Marine stereo

btw, does everything work other than the remotes?

[sundancer]

Re: KTS-MP400MR Marine stereo

Yes, If I run 12volts and gnd to the chassis the remote if functions perfect. all stereo functions too.

[budm]

Re: KTS-MP400MR Marine stereo

"When the remote is plugged in the BU line on pin 6 of the connector drops from 12V to about 1.2V" You need to check the resistance between remote jack pin 6 and the F1 10A fuse, it should be about 10 Ohms (R424, 10 Ohms). For the Voltage to drop down that low it must have high resistance along that path some where otherwise that resistor would have burnt up badly since 12V -1.2v = 10.8V drops on that 10 Ohms resistor which will equal to about 1.08 A of current and the power dissipation of about 11Watts! So I say you have high resistance some where along that BU line back to fuse F1 (Power source).
The 10 Ohms resistor is a protection in case you shorted out the BU pin to ground.

[sundancer]

Re: KTS-MP400MR Marine stereo

Yep that resistor when high 5k, I have two wire wound 5 ohm resistors in series in place of the 10 ohm smd remotes power up, but no data on display unless the remote is grounded to the chassis and there is full continuity between the remote gnd and pin 2 on CN5.
I can’t put it back together until I get the 10 ohm smd resistor.

Thanks

[sundancer]

Re: KTS-MP400MR Marine stereo

Robbed a 10 ohm smd resistor from and old computer cd-rom board, assembled the stereo and the remotes are all working. :-)

Thanks for the Help.

[budm]

Re: KTS-MP400MR Marine stereo

Thanks for the follow-up, the resistor was probably damaged due to accidentally shorted to GND on the BU output at the remote jack .