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C1 AUDIO FIX - FLOPPY NOISE ISSUES
Posted: Fri Jun 03, 2022 11:37 am
by exxos
This fix solves the audio noise issues when accessing the floppy drive.
CURRENTLY THE MIDI AUDIO IS DISABLED (to fix later)
REMOVE THIS CAP
- 1.PNG (121.88 KiB) Viewed 2292 times
SOLDER THE REMOVED CAP FROM THE STEP ABOVE ONTOP OF THIS RESISTOR
- 2.PNG (122.69 KiB) Viewed 2292 times
CUT TRACK - YELLOW LINE
- 3.PNG (123.92 KiB) Viewed 2292 times
SOLDER A 100K 1/8 WATT RESISTOR ACROSS THE POINTS IN YELLOW
- 4.PNG (125.61 KiB) Viewed 2292 times
Done!
Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES
Posted: Fri Jun 03, 2022 11:41 am
by exxos
TRACK CUT ILLUSTRATION
The resistor next to it is only removed for illustration ( do not remove it)
- IMG_0606.JPG (327.45 KiB) Viewed 2291 times
Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES
Posted: Fri Jun 03, 2022 11:42 am
by exxos
RESISTOR MOD ILLUSTRATION
- IMG_0608.JPG (308.75 KiB) Viewed 2291 times
- IMG_0610.JPG (263.69 KiB) Viewed 2291 times
NOTE - The 100K on the right is part of the
YM AUDIO FIX MOD
Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES
Posted: Fri Jun 03, 2022 12:47 pm
by exxos
Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES
Posted: Thu Jun 30, 2022 6:45 pm
by exxos
Illustration to the MIDI fix.
Cut track.
- IMG_0679.JPG (319.62 KiB) Viewed 2168 times
Solder 0805 10uF ontop of the resistor.
- IMG_0681.JPG (304.44 KiB) Viewed 2168 times
Add 100K 1/8w across the pads as shown.
- IMG_0683.JPG (386.81 KiB) Viewed 2163 times
Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES
Posted: Mon Jul 04, 2022 3:05 pm
by exxos
MIDI SYNTH FIX.
(un-verified)
The X2 MIDI audio fix previously was to wire pin 1,2,4, on JP3 prevent audio noise issues when not using the
midi synth board.
The fix is advised for the C3 board involves fitting 100K resistors as outlined in the post below.
OLD METHOD - hardwire wire pins 1,2,4, on JP3
- JP3.PNG (28.52 KiB) Viewed 2117 times
NEW FIX - Solder 100K 0805 resistors as outlined below.
- IMG_0694.JPG (307.93 KiB) Viewed 2117 times
When soldering the resistors angle them outwards slightly and scratch a bit of the GND fill away and solder.
- IMG_0696.JPG (315.99 KiB) Viewed 2117 times
- IMG_0697.JPG (277.92 KiB) Viewed 2117 times
- IMG_0699.JPG (249.84 KiB) Viewed 2117 times
Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES
Posted: Thu Jul 21, 2022 3:02 pm
by exxos
Noise example.