C1 AUDIO FIX - FLOPPY NOISE ISSUES

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C1 AUDIO FIX - FLOPPY NOISE ISSUES

Post 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
1.PNG (121.88 KiB) Viewed 465 times


SOLDER THE REMOVED CAP FROM THE STEP ABOVE ONTOP OF THIS RESISTOR

2.PNG
2.PNG (122.69 KiB) Viewed 465 times

CUT TRACK - YELLOW LINE

3.PNG
3.PNG (123.92 KiB) Viewed 465 times


SOLDER A 100K 1/8 WATT RESISTOR ACROSS THE POINTS IN YELLOW

4.PNG
4.PNG (125.61 KiB) Viewed 465 times

Done!
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Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES

Post by exxos »

TRACK CUT ILLUSTRATION

The resistor next to it is only removed for illustration ( do not remove it)

IMG_0606.JPG
IMG_0606.JPG (327.45 KiB) Viewed 464 times
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Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES

Post by exxos »

RESISTOR MOD ILLUSTRATION

IMG_0608.JPG
IMG_0608.JPG (308.75 KiB) Viewed 464 times
IMG_0610.JPG
IMG_0610.JPG (263.69 KiB) Viewed 464 times

NOTE - The 100K on the right is part of the YM AUDIO FIX MOD
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Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES

Post by exxos »

MIDI AUDIO NOISE FIX

You will need to order 2 capacitors. 0805 10uF 10V


CUT THE YELLOW MARKED TRACK

1.PNG
1.PNG (125.86 KiB) Viewed 454 times


SOLDER a 10uF ACROSS THIS RESISTOR

2.PNG
2.PNG (125.06 KiB) Viewed 454 times


SOLDER A 100K 1/8 WATT (OR 0805) ACROSS THE POINTS IN YELLOW

3.PNG
3.PNG (126.75 KiB) Viewed 454 times


RE-SOLDER A 10uF CAP (ASSUMING YOU REMOVED IT IN THE FIRST STEPS)

4.PNG
4.PNG (121.51 KiB) Viewed 454 times
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Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES

Post by exxos »

Illustration to the MIDI fix.

Cut track.

IMG_0679.JPG
IMG_0679.JPG (319.62 KiB) Viewed 341 times

Solder 0805 10uF ontop of the resistor.

IMG_0681.JPG
IMG_0681.JPG (304.44 KiB) Viewed 341 times

Add 100K 1/8w across the pads as shown.

IMG_0683.JPG
IMG_0683.JPG (386.81 KiB) Viewed 336 times
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Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES

Post 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
JP3.PNG (28.52 KiB) Viewed 290 times

NEW FIX - Solder 100K 0805 resistors as outlined below.

IMG_0694.JPG
IMG_0694.JPG (307.93 KiB) Viewed 290 times

When soldering the resistors angle them outwards slightly and scratch a bit of the GND fill away and solder.

IMG_0696.JPG
IMG_0696.JPG (315.99 KiB) Viewed 290 times
IMG_0697.JPG
IMG_0697.JPG (277.92 KiB) Viewed 290 times
IMG_0699.JPG
IMG_0699.JPG (249.84 KiB) Viewed 290 times
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Re: C1 AUDIO FIX - FLOPPY NOISE ISSUES

Post by exxos »

Noise example.


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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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