Yamaha Tuner T-2

[boisjoli]

Hi ,

I have a Yamaha T-2 tuner. The digital display always shows 100.2. What maybe the problem or which electronic part is faulty.......Analog display works great.

 

[avionic]

Welcome aboard boisjoli ...

 

[avionic]

.Analog display works great.

Does it tune in other frequencies or stay tuned to 100.2.. Maybe it has COVID..

 

[Punker X]

After doing the alignment you have to measure the exact IF frequency then set it with a jumper board on the digital board. Drifts over time and causes this issue. Time for an alignment.

 

[boisjoli]

He tunes to other frequencies.....
He doesn't have the Covid, he was vaccinated.
Seiously,
I have no skills in electronics....Since the digital display is working, I thought the electronic part that sends the information to the display is defective.
. An electronics technician told me that it was complicated to repair and possibly that there is probably no more part to repair it. (Yamaha T-2 year Mfg 1978) Since it runs anyway, keep it as it is.

 

[Punker X]

That electronics technician is wrong. Your tuner needs an alignment. For someone inexperienced, an alignment is complicated.

 

[boisjoli]

For more precision I add this: The tuner works fine. I almost always listen to 95.3 FM. I have had it for 1 year. Since I own it, I have noted different readings on the digital display when I turn it on. Examples: 100.1, 12.0, 23.0, 11.4, 11.9, 13.7, 12.31, 10.7, 100.7, 15.8, 11.2 ... etc

 

[Punker X]

Ok thought you were talking about it tuning to even numbers verses odd. Would could just be bad solder joints or reseating ribbon cables. Possibly a power supply issue.

 

[boisjoli]

What you say makes sense, maybe bad solder joints. I do not believe that there are ribbon cables according to the manual, in any case I do not see any. Note that I am not a technician. At the very least, I'll open it up and check the connectors or solder. Here is the link of the service manual T-2: http://sportsbil.com/yamaha/t-2-sm.pdf

 

[Punker X]

There are three cables going to the digital board and a coax. Multi wire connectors, not true ribbons.

 

[clinic-audio]

boisjoli is French , no ?

 

[boisjoli]

I understand. I see where the three pin connectors are connected. I disconnected one of the connectors and the digital display went out. I disconnected all the pin connectors and lubricated with dielectric grease with no result. For the rest, my knowledge does not allow me to go further. I will probably need to contact a technician. Thank you to you and the others for the information.

.................boisjoli is french ( live in Lévis , Québec )

 

[PabloTincho]

I took my apart Yamaha T-2 and I see 5 filters, some T-2 have 4 ceramic filters ? Which version is the newer one ?

 

[boisjoli]

I have a T-2, I can't tell if it has 4 or 5 filters, but You can see this site .... https: //www.fmtunerinfo.com/yamaha.html

 

[PabloTincho]

here are some pic of the tuner with the serial number

that is the 5th filter on the very right of the tuner, 3 wide filter and 2 the narrow

here is the serial number

 

[Punker X]

Pictures not showing up for me.

 

[audiotemp]

I thought the electronic part that sends the information to the display is defective.
. An electronics technician told me that it was complicated to repair and possibly that there is probably no more part to repair it.

Your (analog) tuner has a built-in digital frequency counter that is constructed from74LSxx TTL chips (common 1970's digital technology) with the addition of a few obscure Hitachi higher-speed parts. It may be repairable but a typical tuner repairman won't have the necessary digital troubleshooting skills. It sounds like the digital counter is not functioning, rather than being just a problem with connections to the display. As a low-level check, you want to ensure that you have clean 5 volt power making it to the digital board.

 

[boisjoli]

Thank you for your information , i keep your comments , which I will show to a technician.

 

[jobrewer1983]

Does it tune in other frequencies or stay tuned to 100.2.. Maybe it has COVID..

Hahaha!!