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V-Tech Music Major

Here is a drawing I did of my V-Tech Music Major PCB with components.

V-Tech Music Major PCB

BU is a blob.
D 1-13 go to the LED display.
Ceramic cap values are in 3 digit notation. The 3rd number is how many zeros to put after the first 2 numbers (i.e. 202 = 2000pf and 471 = 470pf).

Block Diagram of U2
Block Diagram

U Pinout and pin descriptions.
U Pinout

Rough pinout of BU
1::GND
2::?
3::GND
4::U33 (U reset)
5::XOUT
6::XIN
7::Vcc
8::U37 (U data I/O)
9::GND
10::GND
11::U16
12::U23+D8
13::U22+D7
14::U20+D6
15::U19+D5
16::U18+D4
17::U17+D2


The voices, instruments, and functions keypad (notation: [wire combo "K" of traces that join traces (A&B) on pcb]::A&B combos).
Keyboard Play [6,7]::B7,A3
Auto Play [5,7]::B2,A3
Record [4,7]::B4,A3
Demo [3,7]::B6,A3
Off [2,7]::B8,A3
On [8,9]::A2,A1
Rhythm [6,10]::B7,A4
Follow Me [5,10]::B2,A4
Match Rhythm [4,10]::B4,A4
Learn a Note [3,10]::B6,A4
Learn a Song [2,10]::B8,A4
Free Tempo [1,10]::B9,A4
Voice [6,11]::B7,A5
Trumpet [5,11]::B2,A5
Flute [4,11]::B4,A5
Violin [3,11]::B6,A5
Organ [2,11]::B8,A5
Piano [1,11]::B9,A5
Tempo UP [14,11]::B5,A5
Cow [5,12]::B2,A6
Cat [4,12]::B4,A6
Dog [3,12]::B6,A6
Goat [2,12]::B8,A6
Horse [1,12]::B9,A6
Tempo DOWN [14,10]::B5,A4
Bird [[5,13]::B2,A8
Kick [4,13]::B4,A8
Snare [3,13]::B6,A8
Cymbal [2,13]::B8,A8
Bongo [1,13]::B9,A8

Keys I numbered 1-23 (L to R). Black keys are: 2, 4, 7, 9, 12, 14, 16, 19, and 21 (notation: key number::A&B combos).
1::B4,A7
2::B7,A7
3::B6,A7
4::B5,A7
5::B9,A7
6::B8,A7
7::B3,A7
8::B4,B1
9::B7,B1
10::B2,B1
11::B6,B1
12::B5,B1
13::B8,B1
14::B3,B1
15::B4,A9
16::B7,A9
17::B9,B1
18::B6,A9
19::B5,A9
20::B8,A9
21::B3,A9
22::B2,A9
23::B9,A9

And lastly a reverse breakdown of the A&B wires to keys and buttons.
A1::K9
A2::K8
A3::K7
A4::K10
A5::K11
A6::K12
A7::1,2,3,4,5,6,7
A8::K13
A9::15,16,18,19,20,21,22,23
B1::8,9,10,11,12,13,14,17
B2::10,22,K5
B3::7,14,21
B4::1,8,15,K4
B5::4,12,19,K14
B6::3,11,18,K3
B7::2,9,16,K6
B8::6,13,20,K2
B9::5,17,23,K1

LED Display (D wires are in bold).
Power On/Off LED::11,13-(A2,A1),(B8,A3)
Sharp LED::1,12-(B7,A7),(B5,A7),(B3,A7),(B7,B1),(B5,B1),(B3,B1),(B7,A9),(B5,A9),(B3,A9)
G.::2,3-(B4,A7)
A.::4,3-(B6,A7)
B.::5,3-(B9,A7)
C::6,3-(B8,A7)
D::7,3-(B4,B1)
E::8,3-(B2,B1)
F::9,3-(B6,B1)
G::9,10-(B8,B1)
A::8,10-(B4,A9)
B::7,10-(B9,B1)
.C::6,10-(B6,A9)
.D::5,10-(B8,A9)
.E::4,10-(B2,A9)
.F::2,10-(B9,A9)



cappy@sailormouth.org