Bad transformer? Sony CFS-W338 boombox

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Hi Bart,
You will find there is a specification plate on the rear of the unit.
It should have a rating on it showing the wattage of the unit. This is usually the amount needed to operate all the functions of the boombox.
The wattage is your input voltage multiplied by the current draw in amps. So the amperage is the rated wattage of the unit divided by the input voltage.
Usually all power goes through the transformer, so I would use this input amperage as a guide, and assuming there is no power loss, use the same calculation for the output - you know it is 9 volts, so the wattage going to the unit is the same as the input wattage, so you can calculate the amperage from this.
Transformers usually work on AC input/output, so there will also be a rectifier to convert the AC to DC for your boombox.
I would add 10 - 20% above your calculation to make sure you have sufficient power. Also I suggest that you install a fuse between your transformer and the boombox for safety.

there may be 2 possibles

1, the pinch roller is not going down and staying in the fixed when during playback, easy way to check power down the unit, press play and see if it looks firm, it will push back, if working right

if its loose, it may well have come off a little sping, and may well be an easy ish fix, by someone who know about cassette decks,

2, the speed adjustment has failed, there will be an internal speed control, which keeps the playback at a correct speed, if this has failed it may be fixable, but only by someone who can take it to bits and remove and solder a new one in, and they are very small and Sony items i have had have failed on speed control! too for me its a junker box

good luck

There is a fuse on the power supply rectifier board. Check it.

Tv repairs shops carry a selection of power supply cords, also check out Radio Shack Stores.

The adapter is an AC-905. The important bit is the 500 mAmp. The actual part number is 169301611

u can find voltage converter connectors......try using that....u can ask for travel adapters....hope u find them

For transformers, the voltage to turns raio is calculated by formula:

V1 / N1 = V2 / N2 where,
V1 >> Voltage at primary
N1 >> number of turns at primary winding

V2 >> Output voltage at secondary
N2 >> No. of turns at secondary winding

So in your case:

V1 = 230 and V2 = 10. If you know the no of turns of winding at one side, you can calculate the turns on the other side.

Your tape requires 9 volt transformer as shown in below schematic..



Part number is 1-450-016-11

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