TPR-990H Left channel dead

[Tubejunkie]

Much thanks, I can use all the luck I can get

 

[Radio raheem]

your welcome dude

 

[fyj2972]

@Tubejunkie

Before you quit, Are you sure you got that SW18 switch setting correct?
See Fig20 & Fig 21 on page 5 of 990 service manual.
Dont give up so easily.

 

[Tubejunkie]

Thanks for the info fyj2972. I checked out the manual on the figs you referred me to. I haven't taken the MD-1 assembly apart yet as I've never done it before on any other radio, so as a 1st timer I'm a little reluctant due to my inexperience. I made sure the microswitch (SW18?) functions as should but when I traced the wire from the MD-1 motor to the back of the main board I measured for voltage and got about 200millivolts. I just need to know what switch I have to engage so I can get voltage to the MD-1 motor. I will get to the bottom of this issue for sure.

 

[Tubejunkie]

Ok guys, took the MD-1 mechanism out to see the position of the mini switch and wanted to get your opinion on it. Thanks to all who've helped me out so far.

 

[Tubejunkie]

Guys, by any chance do you know how I can get the motor to turn on? What switch(es) do I have to actuate to get the MD-1 motor to turn? Thank you.

 

[Josh9994]

S-16 provides power to the motor, S-17 Is for auto stop. So if S-17 is engaged no power will go to the motor. Page 12 of the service manual shows the location of the switch.

 

[Tubejunkie]

I see S-16 on pg 12 but for the life of me I can't find s17 *shrug*

 

[fyj2972]

Lets read the schematic again. There are two motors in this machine (M1, main motor and M2 loading motor)
SW18 is 12V power supply control to M2.

 

[fyj2972]

If you dont have any voltage readings at SW18 (200MV ?) I will check that R302 fusible resistor is open or not. Most likly you have a burnt protect resistor in this case.

 

[fyj2972]

BTW. the service manual has a misprint error near SW18.

1= C
2=NO normal Open
3=NC normal close

 

[fyj2972]

R302 location on main PCB. If you dont have this type resistor Let me know.


Mouser

 

[Tubejunkie]

fyj2972, you are the man . M2 is where my issue lies. I will check out that resistor as soon as I get home and let you know what the verdict is!

 

[Radio raheem]

Frank is the man

 

[Taopaipai]

Hi, I'm new here, and I have exactly the same problem with my Aiwa TPR-990: the M2 motor does not receive power to run the soft touch system (the motor is in good condition). Could you solve it?
Tubejunkie could you solve it?