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Firepower driver board blowing tip102
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Question
madal
Having a problem with Firepower, started with bottom right pop-bumper now it's moved up and blown Q8,Q4,Q6 all 4A SB
as I be working on the board anyway, I will be replacing old parts for new
40pin look good,
Have just replaced the all 12, 9 pins on the board.
Replaced R196 thru R203 and R204 thru R211 with Zero ohm.
I will be replacing the 8 tip 42 with IRF9Z34NPBF that are on order as well as replacing the 5w with the Zero ohm
The readings I was getting from around the Q6 - Q4- Q8 . were out of spec and some parts where burnt.
so far have replaced
Q6 - Q4- Q8 for tip122
Q5-Q3-Q7. for 2N4401TA
R14-R11-R17. FOR 0.5W Metal Film 68R 1%,
R13-R10-R16. FOR 0.5W MTL 560R 1%,
R15-R12-R16. FOR 0.5W MTL 2K7 1%,
IC 6-7 7408 with SN74HC08N
IC 8-9 7402 with SN74ls02
new reading DIMM set to Diode check
2.7k ohm r9 834, r21 846, r24 838, r15 831, r12 728, r18 847.
560 ohm r7 540, r19 557, r22 549, r13 549, r10 551, r16 551.
68 ohm r8 70, r20 70, r23 70, r14 70, r11 70, r17 70.
2N4401 C Q1 615, Q9 625, Q11 617, Q5 618, Q3 620, Q7 620, useung red on C and black b.
2N4401 E Q1 1858, Q9 1872, Q11 1866, Q5 1853, Q3 1765, Q7 1871, red on E and black b.
tip 122 E Q2 495, Q10 495, Q12 494, Q6 495, Q4 539, Q8 432, red on E and black C.
tip 122 E Q2 626, Q10 626, Q12 627, Q6 626, Q4 675, Q8 627, red on B and black C.
reading from Q4 (E), Q3, R12,and Q8 (E) are still out !. dont know where to go from here ?
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