Reverse engineering a DQ860MA Part 1

2015-03-06 · 999 words · 5 minute read

As announced in one of my last posts i will try to reverse engineer the DQ860MA. Unfortunately i realized that the PCB is a 4 layer PCB, which makes it way harder to get a schematic.

So as a start i will get a list of all components.

part name type footprint value
U1 HCPL2531 Dual High Speed Octocoupler DIL-8
U2 not populated SO-14
U3 3843B PWM controller SO-8
U4 HC14AG Hex-Schmitt Trigger SO-14
U5 PC817 Optocoupler DIL-4
U6 LM317 Voltage Regulator SO-8
U7 AMS1117 LDO Voltage Regulator SOT-223
U8 IR2106S High and Low Side Driver SO-8
U9 IR2106S High and Low Side Driver SO-8
U10 IR2106S High and Low Side Driver SO-8
U11 IR2106S High and Low Side Driver SO-8
U12 LM339DG Quad Comperator SO-14
U13 LM339DG Quad Comperator SO-14
U14 MV358I Operational Amplifier SO-8
U15 ?? Controller TQFP-40
Q1 ?? Transistor SOT-23
Q2 IRFU220N Transistor I-Pak
Q3 IRF540N Transistor TO-220
Q4 IRF540N Transistor TO-220
Q5 IRF540N Transistor TO-220
Q6 IRF540N Transistor TO-220
Q7 IRF540N Transistor TO-220
Q8 IRF540N Transistor TO-220
Q9 IRF540N Transistor TO-220
Q10 IRF540N Transistor TO-220
D1 ?? Diode MiniMelf
D2 ?? Diode MiniMelf
D3 ?? Diode MiniMelf
D4 ?? Diode MiniMelf
D5 ES1J Fast Diode SMA
D6 ES1J Fast Diode SMA
D7 ES1J Fast Diode SMA
D8 ?? Diode MiniMelf
D9 ?? Diode MiniMelf
D10 ?? Diode MiniMelf
D11 ?? Diode MiniMelf
D12 ?? Diode MiniMelf
D13 ?? Diode MiniMelf
D14 ?? Diode MiniMelf
D15 ?? Diode MiniMelf
D16 ?? Diode MiniMelf
D17 ?? Diode MiniMelf
D18 ?? Diode MiniMelf
D19 ?? Diode MiniMelf
D20 UF2G Fast Diode SMB
D21 UF2G Fast Diode SMB
D22 UF2G Fast Diode SMB
D23 UF2G Fast Diode SMB
D24 ?? Dual LED 3mm
D25 ?? Fast Diode SMB
V1 ?? ?? SMA
C1 ?? Capacitor 0805
C2 ?? Capacitor 0805
C3 ?? Capacitor 0805
C4 ?? Capacitor 0805
C5 ?? Capacitor 0805
C6 ?? Capacitor 0805
C7 ?? Capacitor 0805
C8 ?? Capacitor 0805
C9 ?? Capacitor 0805
C10 ?? Capacitor 0805
C11 ?? Capacitor 0805
C12 ?? Capacitor 0805
C13 ?? Capacitor 0805
C14 ?? Capacitor 0805
C15 ?? Capacitor 0805
C16 ?? Capacitor 0805
C17 ?? Capacitor 0805
C18 ?? Capacitor 0805
C19 ?? Capacitor 0805
C20 ?? Capacitor 0805
C21 ?? Capacitor 0805
C22 ?? Capacitor 0805
C23 ?? Capacitor 0805
C24 ?? Capacitor 0805
C25 ?? Electrolythic Capacitor 6mm 25V, 100uF
C26 ?? Electrolythic Capacitor 6mm 25V, 100uF
C27 ?? Electrolythic Capacitor 6mm 25V, 100uF
C28 ?? Electrolythic Capacitor 6mm 25V, 100uF
C29 ?? Electrolythic Capacitor 6mm 25V, 100uF
C30 ?? Capacitor 0805
C31 ?? Capacitor 0805
C32 ?? Capacitor 0805
C33 ?? Capacitor 0805
C34 – – –
C35 ?? Electrolythic Capacitor 20mm 100V, 470uF
C36 ?? Capacitor 1812
C37 ?? Capacitor 0805
C38 ?? Capacitor 0805
C39 ?? Capacitor 0805
C40 ?? Capacitor 1206
C41 ?? Capacitor 1206
C42 ?? Capacitor 1206
C43 ?? Capacitor 0805
C44 ?? Capacitor 1206
C45 ?? Capacitor 0805
C46 ?? Capacitor 0805
C47 not populated Capacitor 0805
C48 not populated Capacitor 0805
C49 ?? Capacitor 0805
C50 ?? Capacitor 0805
C51 ?? Capacitor 0805
C52 not populated Capacitor 1812
R1 3001 Resistor 0805 3k
R2 3001 Resistor 0805 3k
R3 2200 Resistor 0805 220R
R4 2200 Resistor 0805 220R
R5 2200 Resistor 0805 220R
R6 2001 Resistor 0805 2k
R7 2001 Resistor 0805 2k
R8 2001 Resistor 0805 2k
R9 2001 Resistor 0805 2k
R10 103 Resistor 1206 10k
R11 1002 Resistor 0805 10k
R12 1002 Resistor 0805 10k
R13 103 Resistor 1206 10k
R14 1002 Resistor 0805 10k
R15 1002 Resistor 0805 10k
R16 1502 Resistor 0805 15k
R17 1502 Resistor 0805 15k
R18 1003 Resistor 0805 100k
R19 1003 Resistor 0805 100k
R20 1003 Resistor 0805 100k
R21 47R0 Resistor 0805 47R
R22 3901 Resistor 0805 3k9
R23 3901 Resistor 0805 3k9
R24 1001 Resistor 0805 1k
R25 1001 Resistor 0805 1k
R26 1001 Resistor 0805 1k
R27 – – –
R28 5101 Resistor 0805 5k1
R29 5101 Resistor 0805 5k1
R30 5101 Resistor 0805 5k1
R31 5101 Resistor 0805 5k1
R32 5101 Resistor 0805 5k1
R33 5101 Resistor 0805 5k1
R34 1003 Resistor 0805 100k
R35 5101 Resistor 0805 5k1
R36 5101 Resistor 0805 5k1
R37 5101 Resistor 0805 5k1
R38 5101 Resistor 0805 5k1
R39 3600 Resistor 0805 360R
R40 88R7 Resistor 0805 88.7R
R41 R510 Resistor 2010 0.51R
R42 1000 Resistor 0805 100R
R43 1000 Resistor 0805 100R
R44 1000 Resistor 0805 100R
R45 1000 Resistor 0805 100R
R46 1000 Resistor 0805 100R
R47 1000 Resistor 0805 100R
R48 1000 Resistor 0805 100R
R49 1000 Resistor 0805 100R
R50 2002 Resistor 0805 20k
R51 2002 Resistor 0805 20k
R52 2002 Resistor 0805 20k
R53 2002 Resistor 0805 20k
R54 2002 Resistor 0805 20k
R55 2002 Resistor 0805 20k
R56 2002 Resistor 0805 20k
R57 2002 Resistor 0805 20k
R58 Resistor Axial 0.22R, 1%
R59 Resistor Axial 0.22R, 1%
R60 Resistor Axial 0.22R, 1%
R61 Resistor Axial 0.22R, 1%
R62 100 Resistor 0805 10R
R63 100 Resistor 0805 10R
R64 22R0 Resistor 0805 22R
R65 44R2 Resistor 0805 44.2R
R66 91R0 Resistor 0805 91R
R67 5101 Resistor 0805 5.1k
R68 5101 Resistor 0805 5.1k
R69 not populated Resistor Axial
R70 6201 Resistor 0805 6.2k
R71 4702 Resistor 0805 47k
R72 3902 Resistor 0805 39k
R73 3901 Resistor 0805 3k9
R74 1001 Resistor 0805 1k
FU1 10A Fuse Axial F10A
TN1 Transformer ??

A long list for such a small device, can’t even imagine to do that for lets say a pc motherboard :) Unfortunately there are a few parts that i wasn’t able to find a datasheet or they are not labled (like the controller).

Maybe things getting clearer when i start to reverse the wires in the circuit. To do that i will desolder all the parts and then remove the solder mask. There is a great talk by Joe Grand on Youtube that he held on Defcon 22 about exact this topic!

Hopefully i will get to that point soon!

stepper driver DQ860MA reverse engeneering