Sony TCM-450 Microphone Input and Audio Output Replacement

Introduction

If the microphone or audio jacks are not working on your Sony TCM-450 or TCM-450DV, then this guide will tell you how to replace them. The microphone input and audio output are some of the two most important parts of the TCM-450, as the microphone allows you to record yourself or other objects on the tape recorder and the audio output port allows for the use of headphones.

When desoldering the audio output and microphone input you should use some kind of clamp to hold the PCB.

You must be careful when desoldering as there are components that are very close to audio output and microphone input, and you can end up desoldering the components. If this happens you will have to solder the components back on, which can be very difficult even for the most experienced professional. You must be careful when removing the parts as you don't want to rip anything out in the process. The order does not matter, and you do not need to remove one before the other.

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Étape 1 Back Cabinet

Sony TCM-450 Microphone Input and Audio Output Replacement, Back Cabinet: étape 1, image 1 de 3

Sony TCM-450 Microphone Input and Audio Output Replacement, Back Cabinet: étape 1, image 2 de 3

Sony TCM-450 Microphone Input and Audio Output Replacement, Back Cabinet: étape 1, image 3 de 3

Remove the two 3.5 mm Phillips #00 screws from the bottom of the device.
Caution: Ensure the device is off and unplugged if using the power adapter, as it is unsafe to remove the cabinet while on and will cause damage and potential harm to the user.

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Étape 2

Sony TCM-450 Microphone Input and Audio Output Replacement: étape 2, image 3 de 3

Open the lid, and carefully remove the two 9.7 mm Phillips #0 screws from the inside of the front cabinet.
Exercise caution while removing these screws, as damage to essential parts may occur and other minor damages may occur if the screwdriver slips.

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Étape 3

Sony TCM-450 Microphone Input and Audio Output Replacement: étape 3, image 3 de 3

Open the battery cover, and gently remove the back cabinet with the iFixit Opening tool.
The device will make a popping sound when removing the back cabinet. The back cabinet may feel as if it is not loose. However, as long as the back cabinet looks disconnected from the lid, it is safe to remove.

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Étape 4 PCB/Motherboard/Circuit Board

Sony TCM-450 Microphone Input and Audio Output Replacement, PCB/Motherboard/Circuit Board: étape 4, image 1 de 2

Sony TCM-450 Microphone Input and Audio Output Replacement, PCB/Motherboard/Circuit Board: étape 4, image 2 de 2

Carefully desolder each connection and gently remove each connected wire.
If you are unfamiliar with desoldering and soldering, please consult the iFixit Soldering Guide.
Make sure the soldering iron is 50 watts as 30-40 watt soldering irons will not melt the solder on the PCB.

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Étape 5

Carefully desolder the next set of connections and gently remove the connected wires.

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Étape 6

Carefully desolder the last two groups of connections and gently remove the wires.
Caution: Desolder all three marked connections at once before attempting to remove the wires, as they will not fully disconnect and cause damage to the device.

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Étape 7

Sony TCM-450 Microphone Input and Audio Output Replacement: étape 7, image 3 de 3

Carefully remove the three inner screws as shown from the circuit board to loosen it.
Remove the following screws in this order:
A 3.4 mm Phillips #00
A 4.6 mm Phillips #00
A 9.7 mm Phillips #0. To remove this screw you must lift the PCB at the same time.

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Étape 8

Lift the PCB from the device.
Make sure not to pull out any wires while lifting the board, as it could cause damage to the device.

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Étape 9 Microphone Input and Audio Output

Sony TCM-450 Microphone Input and Audio Output Replacement, Microphone Input and Audio Output: étape 9, image 1 de 2

Sony TCM-450 Microphone Input and Audio Output Replacement, Microphone Input and Audio Output: étape 9, image 2 de 2

For both the microphone input and audio output, use a desoldering pump for all three solder points. Use the technique here for all of the soldering points.
To use the desoldering pump create a suction over the solder point and after the solder has melted press the button on the pump like shown in pictures.
If you are unfamiliar with desoldering pumps, please consult the iFixit Desoldering Pump Guide.

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Étape 10

Desolder the first and second point connecting the audio output port.
There will be 2 Solders with white lines under the solders and a label of SP these are speaker solders you do not need to solder/desolder them for this guide.
There are resistors near this piece be careful not touch them with the soldering iron or you will have to put them back in place using the soldering iron.

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Étape 11

Desolder the third and fourth point connecting the audio output port.
After removing all of the solder, gently remove the audio output.
There are resistors near this piece do not touch them with soldering iron or you will have to put them back in place using the soldering iron.
There will be 2 Solders with white lines under the solders and a label of SP these are speaker solders you do not need to solder/desolder them for this guide.
If the device does not feel like it can be removed there may still be solder on the audio output. You will need to go back to the previous step.

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Étape 12

Sony TCM-450 Microphone Input and Audio Output Replacement: étape 12, image 3 de 3

Desolder the first solder point connecting the microphone input port.
After removing all the solder then gently remove the microphone.
There will be 2 Solders with white lines under the solders and a label of SP these are speaker solders you do not need mess with them for this guide.
There are resistors near this piece, do not touch them with soldering iron or you will have to put them back in place using the soldering iron.
If the device does not feel like it can be removed there may still be solder on the microphone input. You will need to go back to the previous step.

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Conclusion

To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.