There is a large, round twist button on the LEFT side of the display screen. Twist this to adjust the volume, usually Clockwise for louder and Counter clockwise for quieter.
Try this web link for the user manual.
https://www.sony.com/electronics/support/res/manuals/4542/45423032M.pdf
Testimonial: "Hi Simon, I Appreciate the Trouble you've gone to, but the manual you've sent me is not for the same radio. I happen to have the file downloaded for the SONY CDX-3100 (E,S,C)3-856-896-21(1) The Manual you sent was for a different SONY 45423032M.pdf. Thank You, Lionel"
No problem. There are many versions of those radios. Could you attach a photo of the radio front? If there is no Round control it is most likely a square or rectangular ‘rocker’ button. It will probably be a larger button on the lower left side of the face plate. Look for a button with a ‘+’ and a ‘-‘ marked on it. Some versions might have ‘Vol’ marked on it. Something like the attached image. It may not be your radio but the round twister and the rocker switches are the most common volume controls.
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SOURCE: sony cdx r3300 Won't play...simply scrolls a message
_half fixed, use the remote -@least can get more life outa the unit!
SOURCE: Sony cdx-M8800 car stereo buttons wont work
There is a ribbon cable that runs all the flip panels electrics, these are prone to breakage.
I have seen some of the cables on e-bay for a few quid, and also if you google "sony x-pod ribbon cable" you will get a big choice of places to order, and get instructions on fitting.
SOURCE: need the wiring diagram for a sony car radio
GRAY PAIR:SPEAKER
GREEN PAIR:SPEAKER
WHITE PAIR:SPEAKER
VIOLET PAIR:SPEAKER
BLACK:GROUND
RED:IGNITION CONTROL
YELLOW:12 VOLTS MAIN
LIGHT BLUE AND STRIPED BLUE:REMOTE OUT MAX .5 AMPS
SOURCE: my sony cdx 4000r is not picking up radio signals
sony cdx4000r not working correctly plays cd s inconsistently radio not playing ariel in place
SOURCE: wiring diagram, sony cdx 3100
Pin Number Wire Color Description
1 White Left front +
2 Green Left rear +
3 Purple Right rear +
4 Gray Right front +
5 Blue/white AMP Remote
6 Blue ANT Remote
7 Red Accessory
8 Black Ground
9 White/black Left front -
10 Green/black Left rear -
11 Purple/black Right rear -
12 Bray/black Right front -
13 Sky blue ATT
14
15 Orange/white Illumination
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