pg octane 900.5 repair

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 30, 2009 at 5:33 AM / IP Logged

We need to cut the legs off of the top left transistor and both of the TIP 36 transistors. Cut the legs off as close as you can to the case of the transistor. After cutting each leg, move it a bit towards the center of the board to make sure it is not making contact with the transistor. REPLACE ALL of the clamps that you removed, Place a 10 amp fuse in the slot that has been blowing. And if you have (2) 5 amp fuses, place them in the other 2 slots. Place the amp back in the vehicle and connect power ground and remote. It may or may not blow the 10 amp fuse, if it does not blow the fuse,

Set your meter to the DC Volts selection. I need to know the DC voltage from the outside legs of the 4 power supply transistors. 2 on top of pic and 2 on bottom of pic. These are the only 4 parts that we are concerned about at this time.

ianarian

Copper - Posts: 516

Joined: April 24, 2009

Location: California, United States

Posted: June 30, 2009 at 7:00 PM / IP Logged

For now I got the amp on my bench its covered and clean and well lit. The 10a sub fuse blew as soon as I switched on remote.

This is what I do for FUN!

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 30, 2009 at 7:11 PM / IP Logged

How many transistors did you cut out of the circuit?

ianarian

Copper - Posts: 516

Joined: April 24, 2009

Location: California, United States

Posted: June 30, 2009 at 7:32 PM / IP Logged

3 total

This is what I do for FUN!

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 30, 2009 at 8:22 PM / IP Logged

Check the transistors directly across from the TIP36Cs. They should be TIP35Cs. Also check these from the left leg to the right leg. Also recheck the one remaining transistor at the top left of the pic, and the 2 at the bottom left of the picture.

Also there is a resistor connected to the left leg of each of the power supply transistors. The transistors in the top row of the pic are positioned correctly. The bottom row are positioned opposite. The resistor will be connected to the left leg of the top row and the right leg of the bottom row. Using the meter now set to the Ohms selection, what is the reading of the 4 transistors we are checking now? Is the resistor that was connected to the top left discolored or burnt?

ianarian

Copper - Posts: 516

Joined: April 24, 2009

Location: California, United States

Posted: July 01, 2009 at 12:32 AM / IP Logged

Yes they are tip35's, lookin at the face/label the 3 legs commming down, are they B,C,E in that order? Lets say that the (Center to Left) legs-.551 on both tip35's. (Center to Right) leg is .OL on both tip35's

the one remaining transistor at the top left of the pic-1.13(C-L) .460(C-R)

and the 2 at the bottom left of the picture.(C-L)1.130 (C-R).458 same for both

I didnt get a ohm reading on the four transistors, testing them in the same fashion as the diode tests.C-L,C-R

All the resistors look ok/same too.

This is what I do for FUN!

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 01, 2009 at 5:21 AM / IP Logged

Cut out the other transistor top left of your diagram. Try the fuse again. We may have a problem with the driver transistor that drives the 2 top transistors. I need to know the value of the resistors, and also follow the trace from the other end of the resistor. It will go to a small transistor. It may go to 2 transistors. I need the number on both of those transistors.

ianarian

Copper - Posts: 516

Joined: April 24, 2009

Location: California, United States

Posted: July 01, 2009 at 4:38 PM / IP Logged

Ok, she blew a 10a when remote switched on..

our two little transistors are both labeled K/620/A1266/Y

the resistors are yellow, purple, black, gold they metered to 46.2ohm

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 01, 2009 at 6:44 PM / IP Logged

The A1266s I am assuming that one is connected to the resistors in top of pic and the other is connected to resistors in the bottom of the pic. With your meter I need ot make sure both of these give the same readings as the other one. Check all possible combinations of leg and lead positions.

Also check the 35s from left leg to right leg.

ianarian

Copper - Posts: 516

Joined: April 24, 2009

Location: California, United States

Posted: July 01, 2009 at 10:58 PM / IP Logged

There is no continuity across the L and R legs of the 35's. I located 4 total mini transistors all appearing to be branched of the resistor as we discussed which all have the same reading. center-Leg1 .904 / center-leg2 .653. Reading displays promptly and stable.

pg octane 900.5 repair - Page 2 -- posted image.

This is what I do for FUN!

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