Hi!
I got a vintage SAD1024 version of DMM for repair. Friend of mine wasn't happy how it was calibrated and tweaked the internal trimmers. It worked for some time, then it stopped, no effect.
I did some research and found this page helpfull providing some info and schematics with calibration process (however, I don't have an oscilloscope ).
https://sites.google.com/a/davidmorrin. ... memory-man
https://sites.google.com/a/davidmorrin. ... n/eh-1307b
I measured the transformer voltage, measuring about 19V. I measured the voltage of ICs and I was hoping if someone have the same pedal and can help me and post the measurments of the working DMM ICs. Thanks!
These are mine measurements:
IC1 4558
1 6.89
2 6.90
3 6.88
4 0.00
5 6.85
6 6.92
7 6.93
8 13.88
IC2 NE570
1 0.98
2 1.77
3 1.77
4 0.00
5 1.77
6 1.77
7 5.00
8 1.77
9 1.77
10 7.55
11 7.55
12 1.77
13 13.91
14 1.77
15 1.77
16 0.80
IC3 4558
1 5.00
2 5.00
3 4.98
4 0.00
5 4.99
6 5.01
7 6.95
8 13.98
IC4 SAD1024
1 0.00
2 3.98
3 6.95
4 0.00
5 0.00
6 0.00
7 0.00
8 6.94
9 0.00
10 6.94
11 0.00
12 0.00
13 0.00
14 6.95
15 3.99
16 0.00
IC5 SAD1024
1 0.00
2 3.98
3 6.95
4 0.00
5 0.00
6 0.00
7 0.00
8 6.94
9 0.00
10 6.94
11 0.00
12 0.00
13 0.00
14 6.95
15 3.99
16 0.00
IC6 4558
1 4.17
2 4.17
3 4.13
4 0.00
5 0.00
6 9.52
7 13.21
8 13.90
IC7 SAD1024
1 0.00
2 4.10
3 6.94
4 0.00
5 0.00
6 0.00
7 0.00
8 6.93
9 0.00
10 6.94
11 0.00
12 0.00
13 0.00
14 6.94
15 4.17
16 0.00
IC8 SAD1024
1 0.00
2 4.47
3 6.94
4 0.00
5 0.00
6 0.00
7 0.00
8 6.94
9 0.00
10 6.94
11 0.00
12 0.00
13 0.00
14 6.94
15 4.43
16 0.00
IC9 4558
1 13.02
2 12.99
3 13.17
4 0.00
5 7.50
6 7.57
7 7.57
8 13.90
IC10 CD4047AE
1 7.01
2 6.84
3 6.86
4 13.88
5 13.89
6 13.89
7 0.00
8 0.00
9 0.00
10 6.94
11 6.94
12 0.00
13 7.02
14 13.89
Deluxe Memory Man help
- Brainbender
- Breadboard Brother