Sennheiser Ew100/G2 Wireless Mic Receiver

[falcontech]

hello everyone I have a problem with the receiver of this microphone which is a sennheiser ew100 / G2, attached the photo of the main board and the service manual of the receiver, and I'll put the youtube link for the video of the problem I don't know if it is a power problem, for the moment I realized that the power supply should bring out 13VDC but almost 19 come out, it is not a display problem, because when it starts doing this problem (after a few seconds) the transmitter stops working. I await your advice thank you

[falcontech]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

https://www.youtube.com/watch?v=b8fOD7irM-I

[budm]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

hello everyone I have a problem with the receiver of this microphone which is a sennheiser ew100 / G2, attached the photo of the main board and the service manual of the receiver, and I'll put the youtube link for the video of the problem I don't know if it is a power problem, for the moment I realized that the power supply should bring out 13VDC but almost 19 come out, it is not a display problem, because when it starts doing this problem (after a few seconds) the transmitter stops working. I await your advice thank you

So your AC adapter is putting out 19VDC instead of 13V?
The service manual page 5 shows DC input jack rating of 10.5 ~ 16V 200mA, nominal is 12V.
Show us the pictures of the AC adapter you are using.

[falcontech]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

in a while I attach the photo, however it is the original of the sennheiser NT2, I tried with another power supply but the problem remains, surely some component is gone and I thought about the voltage regulator 78m08

[falcontech]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

here are the pictures

[stj]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

can you open that, or is it glued shut?

[petehall347]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

might need a load on it

[falcontech]

Re: Ricevitore microfono wireless Sennheiser Ew100/G2

can you open that, or is it glued shut?

it can be opened but at the moment the power supply is not the problem, because it will be replaced, but the receiver that gives that problem, look at the video that I put on youtube

[falcontech]

Re: Ricevitore microfono wireless Sennheiser Ew100/G2

might need a load on it

I understand what you mean, tomorrow I will test with the receiver on

[budm]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

It is not regulated power supply so the output will be higher than 13V without load, it will be 13V with 250mA load.
What Voltage do you get at the dc jack when the unit is turned on?
There are many power supplies on that receiver unit, look at page 14, 15, 19, 20 of the service manual, it shows you the Voltage test points that you need to check. Did you check them?

[falcontech]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

I test what you asked for and I will let you know

[falcontech]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

I disassembled the 78m08 voltage regulator, and I am waiting for the new one to be replaced to replace it, I keep you updated

[budm]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

I disassembled the 78m08 voltage regulator, and I am waiting for the new one to be replaced to replace it, I keep you updated

What are the input and output Voltages you are getting on this +8V regulator?

[falcontech]

Re: Ricevitore microfono wireless Sennheiser Ew100/G2

What are the input and output Voltages you are getting on this +8V regulator?

I'm waiting for you to come to assemble it and then I'll tell you, with what I took apart I only remember the output voltage which was about 6 volts

[budm]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

You should be able to test the input and output Voltage easily, you should also check the resistance of the output to see if it shows very low Ohms or not, nothing special or hard about doing simple test.

[falcontech]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

I tested the voltages, I realized that at the input of this resettable fuse I have 16 volts at the input and then at the output I have 8.5 volts do you think this could be the problem?

[budm]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

I tested the voltages, I realized that at the input of this resettable fuse I have 16 volts at the input and then at the output I have 8.5 volts do you think this could be the problem?

What is the P/N printed on it, I see XD75????, 24V
Unplug the DC jack and let the fuse cool down then check the resistance of the fuse.
Also check the resistance of that black cylinder device connected to that fuse also.

[falcontech]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

on the fuse the acronym is x075f 24v, that cylindrical part I did not understand what component it is if you can give me a hand through service manual I would be grateful

[R_J]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

The cylindrical part is likely D210 SM4007, polarity protection diode

[budm]

Re: Sennheiser Ew100/G2 Wireless Mic Receiver

[QUOTE=falcontech;979358]on the fuse the acronym is x075f 24v, that cylindrical part I did not understand what component it is if you can give me a hand through service manual I would be grateful[/QUOTE]
1) That black component is a protection diode D210 (SM4007) in case the unit is connected to the wrong polarity of the AC/DC adapter. So check the RESISTANCE as I requested.

2) Fuse F210 (X075F 24V) is rated at 0.75A per schematic. Did you check the resistance (no power applied to the unit for at least 10 minutes) as I requested?

3) You must follow my instructions when I request you to do the measurement otherwise we are just wasting times here.