alpine mrp-m1000

[mike49504]

Working on this amp the blue light comes on but amp isnt powering up

Heres the voltages on the 494

1:0
2:4.76
3:4.70
4:0
5:0
6:0
7:0
8:0
9:0
10:0
11:0
12:0
13:0
14:0
15:0
16:0

Any ideas?

 

[Perry Babin]

What's the DC voltage on the three terminals of Q9101?

 

[mike49504]

LEG1:0
LEG2:0.24
LEG3:0

 

[Perry Babin]

Blown fuses?

 

[mike49504]

Ok replaced battery in my meter

ON Q9101

1:13.93
2:0.52
3:13.83

 

[Perry Babin]

DC voltage on collector of Q9102?

 

[mike49504]

not sure which leg is what but the top leg is 13.86, bottom 2 legs 0 volts

 

[Perry Babin]

Email me. You need to compare the voltages on the microcontroller to see which are significantly different than they should be.

 

[Perry Babin]

What is the DC voltage on each end of R9106 (black probe on ground)?

 

[mike49504]

0 volts on both ends

 

[Perry Babin]

If you have 5v on pin 33 of IC5002 and 0v on that resistor, you have an open circuit between them that you'll have to track down.

 

[mike49504]

OK got the amp to power up and its producing rail/regulated voltages.

Amp has no output.


ANy ideas on where to check?

 

[Perry Babin]

Do you have rail-rail oscillation on the output transistors?

 

[mike49504]

I probed the the input of the output inductor and trace stayed centerd didnt move.

I probed the outputs and got it to deflect but have no square wave

 

[Perry Babin]

What is the DC voltage on pin 13 of IC9802?

 

[mike49504]

-47.0 volts

 

[Perry Babin]

DC voltage on base of Q4501?

 

[mike49504]

top leg -4.94

Other 2 legs 4.95

 

[Perry Babin]

DC voltage on pin 2 and pin 6 of IC5005?

 

[mike49504]

PIN2:5.08

PIN6:5.08