service manual request

[Chip]

Manufacturer: samsung

Type of Appliance: dryer

Model Number: DV48J7700EW/A2

Have you validated the model number at an online parts site like Repair Clinic? (yes or no): YES

Have you watched the video on how to search for manuals and have you searched the Downloads section prior to posting this request? (yes or no): YES

I have a samsung dryer DV48J7700EW/A2 that is not heating. 

ive checked the thermistor, thermostat, high limit thermostat, thermal fuse, heating element and centrifical switch on motor. all check good

board is sending 120vac from both lines to the element yet it is still not heating.

it doesnt matter if dryer is on sensor or manual mode

all connections look good

anyone have any ideas what could be going on?

thanks

[johntech]

The fast track is in the download section just type in dv48j* and you should find it. 

There are 2 centrifugal switchs in the motor. One sends 120 to element and the other tells the board the motor is turning so it will send the other 120v to the motor. The diagram is in the fast track.

[Chip]

Thank you @johntech

 

[Chip]

I went back and tested the centrifugal switch again before I started replacing boards. 

 Lower one (on schematic) tests good. the top one (going through the door switch) was unusual.

Unplugged- no continuity (from black wire on pin 7 to neutral at terminal) as soon as I plugged unit in, I was getting continuity. Continued to have continuity through power up and while dryer was running. 

I just thought of it now but I didn’t unplug pin 7 and check for continuity to isolate the motor

 

Could it it be a board issue or more likely the motor? 

[Samurai Appliance Repair Man]

Start a new topic in the Tech Repair forum and we'll take it up there.