Power supply in Spy Hunter

SuperBee4406

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Trying to get my power supply pcb in my Spy Hunter going. I tested for +5 across the cap closest to the 15 pin connectors and only get 3.8vdc. I replaced the two bottle cap transistors, the TIP31, Q102, Q105, the IC at location U3, Q201. Whats left I need to do to get +5.
 
this thing is sounding like the pile I've spent $40 and 40 hours on. lol
 
Is the fuse on the power supply blowing? Are you getting a good 12VDC?

I'd ohm out Q103 and Q104. Q103 is the "bottlecap" in the middle of the heat sink. These power supplies usually have the transistors' base/emitter/collector labeled (B, E, and C) on the bottom side of the board. With your meter set on low ohms (if not auto-ranging).....your meter should damn near zero out, or at the very least, show very low ohms. This applies to all of these measurments.

Check the "C" of Q103 to a leg of L101. Now check it to connector J3---pins 4 and 8.

Check "B" of Q103 to "E" of Q104 (Q104 is the TIP31). Now check it to R111, R112, and the positive leg of C108.

Check the "E" of Q103 to a side of ferrite bead FE2

Now let's ohm out Q104 (TIP31).....Check "C" to "E" of Q105. Now check it to R104.

Check "B" of Q104 to "C" of Q105. Now check it to R112.

It's not necessary to check the emitter of Q104. Electronically speaking, it was already check when you ohmed out the base of Q103.

This is all the main regulating componets in the 5V line except for U2 (LM305).

Edward
 
Hopefully this is that messed up power board I gave you and it's working with a good one? It was running real solid with a switcher. If it helps at all, it did blow a fuse when that board went.
 
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