- Joined
- Apr 3, 2011
- Posts
- 5,850
SMS II RGB - 171-5922A to 171-5926A aka 837-7275
CXA1145 circuit populate list
Source schematic:
Source board: a IC BD M4Jr VA1 171-5926-A (837-7275) board I have in person
Notes: made this conversion list because I wanted my PAL SMS II French RGB system to have composite video. The 171-5922A and 171-5926-A circuits for the CXA1145 look to be nearly identical in parts and layout, just the labels are all different. Seems like the 5926-A does leave out the odd cap and inductor though. Not tested yet but this list should be accurate.
Legend:
Left part = 171-5922A board
Right part = 171-5926-A (837-7275) board
Pin = CXA1145 pins
Pin 2
C27 = 0.1uF = C56
R13 = 820 ohm = R51
R12 = 8.2k ohm = R52
Pin 3
C28 = 0.1uF = C57
R15 = 820ohm = R53
R14 = 8.2k ohm = R54
Pin 4
C29 = 0.1uF = C58
R17 = 820 ohm = R55
R16 = 8.2k ohm = R56
Pin 5
Not used
Pin 6
C26 = 0.1uF = C60
R10 = 3.3k ohm = R57
R11 = 1k ohm = R58
C25 = 82pF = C59
Pin 7
Tied direct to VCC for NTSC
Pin 8
C31 = 1uF = C62
R19 = 1.5k = R59
(C30 and R20 don't seem to be present)
Pin 9
R28 = 8.2k ohm = R67
C40 = 0.1uF = C70
FB6 = FB54
R27 = 10k ohm = R68
Pin 10
R18 = 2.2k = R61
Pin 11
Not used
Pin 13
R18 = 27k ohm = R66
C39 = 0.1uF = C69
Pin 14
R22 = 1k ohm = R63
C32 = 10uF = C73
C33 = 12pF = C68
C37 = 180pF = C67
L2 = 100uH = L1
Pin 15
R25 = 1k ohm = R65
C36 = 100pF = C66
(L1 doesn't seem to be present)
Pin 16
R30 = 1.5k = R62
Pin 17
C34 = 0.1uF = C64
C35 = 12pF = C65
L3 = 100uH = L2
R24 = 1k ohm = R64
Pin 18
(Shares parts with pin 14)
Pin 20
R21 = 2K ohm = R69 (PAL = 75 ohm)
C38 = 100uF = C71
R29 = 2.2k ohm = R70 (PAL = 33 ohm)
FB5 = FB53
Pin 21, 22, 23
Not used
Extras for 837-7275:
C63 = 0.1uF (?)
/end of file
CXA1145 circuit populate list
Source schematic:
Source board: a IC BD M4Jr VA1 171-5926-A (837-7275) board I have in person
Notes: made this conversion list because I wanted my PAL SMS II French RGB system to have composite video. The 171-5922A and 171-5926-A circuits for the CXA1145 look to be nearly identical in parts and layout, just the labels are all different. Seems like the 5926-A does leave out the odd cap and inductor though. Not tested yet but this list should be accurate.
Legend:
Left part = 171-5922A board
Right part = 171-5926-A (837-7275) board
Pin = CXA1145 pins
Pin 2
C27 = 0.1uF = C56
R13 = 820 ohm = R51
R12 = 8.2k ohm = R52
Pin 3
C28 = 0.1uF = C57
R15 = 820ohm = R53
R14 = 8.2k ohm = R54
Pin 4
C29 = 0.1uF = C58
R17 = 820 ohm = R55
R16 = 8.2k ohm = R56
Pin 5
Not used
Pin 6
C26 = 0.1uF = C60
R10 = 3.3k ohm = R57
R11 = 1k ohm = R58
C25 = 82pF = C59
Pin 7
Tied direct to VCC for NTSC
Pin 8
C31 = 1uF = C62
R19 = 1.5k = R59
(C30 and R20 don't seem to be present)
Pin 9
R28 = 8.2k ohm = R67
C40 = 0.1uF = C70
FB6 = FB54
R27 = 10k ohm = R68
Pin 10
R18 = 2.2k = R61
Pin 11
Not used
Pin 13
R18 = 27k ohm = R66
C39 = 0.1uF = C69
Pin 14
R22 = 1k ohm = R63
C32 = 10uF = C73
C33 = 12pF = C68
C37 = 180pF = C67
L2 = 100uH = L1
Pin 15
R25 = 1k ohm = R65
C36 = 100pF = C66
(L1 doesn't seem to be present)
Pin 16
R30 = 1.5k = R62
Pin 17
C34 = 0.1uF = C64
C35 = 12pF = C65
L3 = 100uH = L2
R24 = 1k ohm = R64
Pin 18
(Shares parts with pin 14)
Pin 20
R21 = 2K ohm = R69 (PAL = 75 ohm)
C38 = 100uF = C71
R29 = 2.2k ohm = R70 (PAL = 33 ohm)
FB5 = FB53
Pin 21, 22, 23
Not used
Extras for 837-7275:
C63 = 0.1uF (?)
/end of file
Last edited: