Assistance required to identify replace in Luxman T-240 tuner

hew128 · 9th February 2010, 11:22 AM

Hi,

Need assistance to identify a Sumida part (L101) on the motherboard of a Luxman T-240 tuner. And if anyone knows of a substitue for it.

The item is black rectangle with two hex key nuts for adjustment on the top. Think it needs to be replace on my friends tuner as it did not sound good until I discovered one of the hex nuts seem to be loose (in some manner). When I touched the hex nut with my finger, sound on the tuner either goes silent or sound terrible. Touching it again, sound can be great! Hence as a temporary fix, I managed to glue it into position. Sounds acceptable at the moment but would be preferrable if the Sumida part can be replaced.

Any assistance will be greatly appreciated.

Thanks!

oshifis · 9th February 2010, 12:58 PM

If there are two of them (one for R, one for L channels), that must be a FM multiplex filter. TOKO used to produce such filters (and AFAIK Sumida is TOKO). If there is only one, it could be the FM discriminator. If the ferrite core is not broken, you don't need to replace the whole part. Adjust the loose core for clean sound and maximum audio output. Do not touch the other core. Better alignment can be achived with instruments.

hew128 · 9th February 2010, 01:27 PM

Hi oshhifis,

Afraid is the ferrite core on the FM multiplexer filter as when I put a screwdriver near it - it stucked!

Any ideas on the replacement?

Thanks!

oshifis · 10th February 2010, 05:41 AM

It is the FM detector indeed. No need to replace IMHO. Use a plastic screwdriver, not a metallic one. The SM can be downloaded from here:

Luxman T240 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics

I hope I could help.

hew128 · 10th February 2010, 08:03 AM

Thanks!

Will try to download it later today!

9th February 2010, 11:22 AM	#1
hew128 diyAudio Member Join Date: Jan 2006 Location: Singapore	Assistance required to identify replace in Luxman T-240 tuner Hi, Need assistance to identify a Sumida part (L101) on the motherboard of a Luxman T-240 tuner. And if anyone knows of a substitue for it. The item is black rectangle with two hex key nuts for adjustment on the top. Think it needs to be replace on my friends tuner as it did not sound good until I discovered one of the hex nuts seem to be loose (in some manner). When I touched the hex nut with my finger, sound on the tuner either goes silent or sound terrible. Touching it again, sound can be great! Hence as a temporary fix, I managed to glue it into position. Sounds acceptable at the moment but would be preferrable if the Sumida part can be replaced. Any assistance will be greatly appreciated. Thanks!

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9th February 2010, 12:58 PM	#2
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	If there are two of them (one for R, one for L channels), that must be a FM multiplex filter. TOKO used to produce such filters (and AFAIK Sumida is TOKO). If there is only one, it could be the FM discriminator. If the ferrite core is not broken, you don't need to replace the whole part. Adjust the loose core for clean sound and maximum audio output. Do not touch the other core. Better alignment can be achived with instruments.

9th February 2010, 01:27 PM	#3
hew128 diyAudio Member Join Date: Jan 2006 Location: Singapore	Hi oshhifis, Afraid is the ferrite core on the FM multiplexer filter as when I put a screwdriver near it - it stucked! Any ideas on the replacement? Thanks!

10th February 2010, 05:41 AM	#4
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	It is the FM detector indeed. No need to replace IMHO. Use a plastic screwdriver, not a metallic one. The SM can be downloaded from here: Luxman T240 Service Manual free download,schematics,datasheets,eeprom bins,pcb,repair info for test equipment and electronics I hope I could help.

10th February 2010, 08:03 AM	#5
hew128 diyAudio Member Join Date: Jan 2006 Location: Singapore	Thanks! Will try to download it later today!