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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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15th May 2018, 6:01 am | #1 |
Retired Dormant Member
Join Date: Mar 2018
Location: Bendigo, Victoria, Australia.
Posts: 5
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LA 16 Diode
Hi
I have to replace two diodes in a Hitachi music centre SDT-7660, I cannot find a schematic to download and the marking on the diodes is LA 16. I have searched the net for information on this diode without success and I am hoping someone could point me in the right direction. I have gone through and changed the belts to the turntable and cassette player and cleaned the unit through. When I went to power up the cassette player it had no power, when I connected the 12-volt bench power to it everything worked fine and with a bit of searching, I found the burnt out diodes and I presume these are the cause for loss of power to the cassette player on the unit. Thanks Paul |
15th May 2018, 11:30 am | #2 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,549
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Re: LA 16 Diode
They will most likely be ordinary rectifier diodes such as 1N4002 (small) or 1N5402 (large).
Higher voltages will work if you have got them in your stash. |
15th May 2018, 7:27 pm | #3 |
Heptode
Join Date: Mar 2011
Location: Dorset, UK.
Posts: 519
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Re: LA 16 Diode
Suspect they are the standard, difficult to get, 16V zener diodes commonly employed in late 1970's Hitachi audio. Some fail due to overheating and if short circuit I would also check associated series feed resistor going low value. Physically, from memory, they were possibly of glass/ceramic bead construction.
Cheers Rich
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To an optimist a glass is half full; a pessimist half empty; an engineer twice as big as need be! |
15th May 2018, 7:57 pm | #4 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: LA 16 Diode
The SDT 7680 might use 16 volt Zeners, not sure what, if anything the circuit has in common with the SDT 7660, SDT 7680 manual's available on Elektrotanya.
(I think) Lawrence. Last edited by ms660; 15th May 2018 at 8:07 pm. Reason: correction |
16th May 2018, 1:13 am | #5 |
Retired Dormant Member
Join Date: Mar 2018
Location: Bendigo, Victoria, Australia.
Posts: 5
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Re: LA 16 Diode
Hi.
I downloaded the 7680 service manual and it is not close to the 7660. Cheers. |
16th May 2018, 10:34 am | #6 |
Rest in Peace
Join Date: May 2003
Location: Harlaxton, Lincolnshire, UK.
Posts: 3,944
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Re: LA 16 Diode
I suspect your diode is a Hitachi AU01-16 and the markings are possible a short form type number. The AU01-16 is a 16 volt zener rated at 2.5 watts (see attached data sheet).
Can you post a picture of the board with the diodes on? |
16th May 2018, 10:42 am | #7 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: LA 16 Diode
The SDT 7680 I referred to earlier uses them.
Lawrence. |