Saturday April 13, 2024

Stern Pinball SB-100 Sound Board

Boards With CHIME Circuits  (Original SB-100)
The first version of the SB-100 we'll look at is the fully populated board with the U5 chip and CHIMES circuitry.

Original SB-100
Picture: Stern SB-100 with CHIMES circuitry.  Board is fully populated (and a little dusty)

Schematic
Original SB-100 schematic from Hot Hand manual


Component List
Here is a component list that I gathered from the SB-100 schematics in a Stern Hot Hand manual.  Again please note that these components are for the SB-100 that has a U5 IC and whose board is fully populated.  If your board is missing U5 and instead looks like the Rev C-1 board (see below), then its component list is slightly different.

Resistors
Capacitors
12 100k ohm r3, r4, r5, r7, r8, r9, r10, r11, r14, r17, r81, r86
1 0.003uf c38
9 10k ohm r24, r27, r30, r33, r36, r67, r71, r83, r84
1 0.022uf (50v) c45
5 10m ohm r40, r41, r52, r53, r90
1 0.033uf c39
1 15k ohm r21
32 0.1uf c2, c3, c4, c5, c6, c7, c8, c10, c12, c13, c14, c16, c17, c23, c24, c25, c26, c27, c28, c29, c30, c31, c32, c33, c34, c35, c37, c40, c43, c46, c49, c54
5 1k ohm r19, r20, r65, r70, r88
1 1000uf (25v) elec. c51
5 1m ohm r22, r25, r28, r31, r34
1 1000uf (35v) elec. c53
2 2.2 ohm r64, r66
1 100pf c44
11 2.2k ohm r1, r12, r15, r16, r23, r26, r29, r32, r35, r68, r89
2 10uf c42, c52
5 2.2m ohm r69, r77, r78, r79, r80
1 220uf (25v) bi-polar elec.
c47 (could also use 100uf in parallel at c47, c48)
2 220 ohm r91, r92
1 22uf (10v) tant. c9
1 22k ohm r63
1 3.3uf c18
4 390k ohm r73, r74, r75, r76
6 4.7uf (10v) tant. c1, c19, c20, c21, c22, c50
1 39k ohm r62
1 47uf (35v) elec. c55
8 47k ohm r39, r42, r51, r54, r61, r82, r85, r87
2 56pf c36, c41
1 56k ohm r72
2 680pf c11, c15
3 5k ohm (pot) r2, r6, r13



1 680k ohm r18
ICs
16 820k ohm r37, r38, r43, r44, r45, r46, r47, r48, r49, r50, r55, r56, r57, r58, r59, r60
1 7402 u1




1 7411 u2
Transistors / Semiconductors
3 7475 u3, u4, u5
5 2n4403 q1, q2, q3, q4, q5
1 74107 u6
2 2n3904 q6, q7
1 7408 u7
1 1n763a cr1
2 4013 u8, u9
1 1n758a cr2
5 mc3340p u10, u11, u12, u13, u14




4 lm324n u15, u16, u17, u18




1 556 u19




2 lm380 u20, u21




1 78L05 u22



Boards Without CHIME Circuits (Revision C-1)
The next board version we'll look at is a Rev C-1.  This board does not have the U5 IC or CHIMES circuitry, nor does it have the silkscreen drawings/labels for the missing components.  There is another [assumed earlier] revision of this board that has the silkscreen labels on the omitted components.

Stern SB-100 Rev C-1
Picture: Stern SB-100 Rev C-1.  No CHIME circuitry.

Schematic
The schematic below is the original SB-100 with the components that are not on the Rev C-1 board grayed out.


Component List
For boards with a U5 IC and chimes circuits, the component list should be something like below.  **This may be incorrect as I've eliminated components from the fully populated board schematics and have not verified every single component values for the Rev C-1 board, but should be pretty close.  The on-board potentiometer values are definitely different on my Rev C-1 boards.

Resistors
Capacitors
12 100k ohm r3, r4, r5, r7, r8, r9, r10, r11, r14, r17, r81, r86
1 0.003uf c38
5 10k ohm r24, r67, r71, r83, r84
1 0.022uf (50v) c45
1 10m ohm r90
1 0.033uf c39
1 15k ohm r21
20 0.1uf c2, c3, c4, c5, c6, c7, c8, c10, c17, c23, c24, c28, c31, c35, c37, c40, c43, c46, c49, c54
5 1k ohm r19, r20, r65, r70, r88
1 1000uf (25v) elec. c51
1 1m ohm r22
1 1000uf (35v) elec. c53
2 2.2 ohm r64, r66
1 100pf c44
7 2.2k ohm r1, r12, r15, r16, r23, r68, r89
1 10uf c42
5 2.2m ohm r69, r77, r78, r79, r80
1 220uf (25v) bi-polar elec. c47 (could also use 100uf in parallel at c47, c48)
1 220 ohm r92
1 22uf (10v) tant. c9
8 47k ohm r39, r42, r51, r54, r61, r82, r85, r87
1 3.3uf c18
1 56k ohm r72
2 4.7uf (10v) tant. c1, c50
3 5k ohm (pot) r2, r6, r13
1 47uf (35v) elec. c55
1 680k ohm r18
2 56pf c36, c41




1 680pf c11
Transistors / Semiconductors



1 2n4403 q1
ICs
2 2n3904 q6, q7
1 7402 u1
1 1n758a cr2
1 7411 u2




2 7475 u3, u4




1 74107 u6




1 7408 u7




2 4013 u8, u9




1 mc3340p u14




2 lm324n u17, u18




1 556 u19




2 lm380 u20, u21




1 78L05 u22


Continue to How The Boards Work..

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Comments:
Stern Nugent Sound Board needed
Posted 05/03/12 1:53PM by nowears
Please let me know when / if you have a stern sb-100 sound board available. My Nugent does not have one.
Thanks,
Re: Anonymous Techdoser
Posted 12/31/11 2:41PM by AceBHound
Hi Bob, contact me via email on the "Contact Us" page on the left-hand navigation menu on this website. We can discuss details further.
Anonymous Techdoser
Posted 12/26/11 4:04PM by Anonymous Techdoser
Hi, Do you have an SB-100 for sale and how much? Would you give a discount for my non-working board? If not, how much to repair mine? Thanks, Bob
Re: Great Info
Posted 12/05/11 6:38PM by AceBHound
I may have an extra SB-100 available soon -- I'll email you. Also for anyone else interested, I will likely have more for sale down the road & entertain repairing some boards for people as time permits if they aren't severely hacked. Repair costs would depend on how "dead" your board is. Email is on my Contact page on this website.
Great Info
Posted 11/03/11 4:43PM by bobcav
This is great info. I'm currently looking for an SB 100 sound board as my Nugent machine has never had a board since I've owned it. Any thoughts on how to acquire one, either in working order or not?
Stern SB 100 sound board
Posted 03/10/11 8:24AM by Anonymous Techdoser
what a great help!
The test point voltages certainly gave me the confidence to make a repair to a Stern "Magic".
I had replaced the chips in their entirety, capacitors, transistors, zenner diode and a couple of blown resistors. Until I found your voltage listing I could not have any confidence in the work I had done. I soon traced the problem to a cracked lead on the circuit board, in the voltage splitter prior to the amp chips.
Thanks!!!!