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Old 28th April 2011, 12:10 AM   #1
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Default orion XTR 900/2

i cant understand where my power is going i cant find it anywhere.

i have 12v on the center leg of the power supply and 12v on the torridial transformer. i also have 12v on the first leg of Q44. and the 3rd leg of Q45.

other than this i cant find < .5v anywhere else and i cant see anything else burnt any ideas?

i have 2 big caps that are 3300uF 35v and when i put my ESR meter on them they start super high around 4 and over ~1 min it drops to .07. is this normal? what does this mean?

also i replaced the transistors in the blue boxes
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Last edited by scampo77; 28th April 2011 at 12:13 AM.
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Old 28th April 2011, 12:31 AM   #2
kjf is offline kjf  United States
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any output from the 494?
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Old 28th April 2011, 01:41 AM   #3
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Post the DC voltage on the 494.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
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Old 28th April 2011, 03:15 AM   #4
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all legs are 0v
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Old 28th April 2011, 03:35 AM   #5
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What is the DC voltage on the thermal switch on the bottom of the board?
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Old 28th April 2011, 03:42 AM   #6
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its battery voltage on both sides ~13v
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Old 28th April 2011, 03:52 AM   #7
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There is an MPSA56 with its collector connected to pin 12. Post the DC voltage on all 3 legs.
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Old 28th April 2011, 04:00 AM   #8
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its Q44

E - 13V
B - 13V
C - 0V

and i just changed this one a hour ago
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Old 28th April 2011, 04:07 AM   #9
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There's an MPSA06 connected to the base of the A56. Post the voltage on it.
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Old 28th April 2011, 03:30 PM   #10
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the A56 at location Q44 is attached to a black strip thing with 8 pins on it that i have never seen before and i dont know what it is. the base (the middle leg) is attached to this thing. i tried to draw lines showing where everything goes to

MPSA06 location Q45

E - 0
B - 0
C - 13v

i just want to make sure that according to my picture that the emitter is on the left the base in the middle and the collector is on the right
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