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Old 26th July 2006, 05:51 PM   #1
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Default Help me identify this?

I'm about to put in an order for some parts to repair an older hitachi
amp. On the preamp section is a little diode that is physically broken.
I'm having a hard time cross referencing it. The board is marked CR-12
(control rectifier 12?).

It is a barrel shaped axial-lead pellet (2.5mm x 3.5mm) of white ceramic with a brown stripe on one end. It is marked N 1 6 followed by the hitachi symbol. I'm not well versed in electronics, but I've seen hundreds of these thing on boards, yet I cannot find a similar image online. None of the parts suppliers can cross ref it. Hitachi cannot help me. A local "electronics guy" doesn't know what to make of N 1 6.

Anyone know what common diode I can safely replace this with?
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Old 26th July 2006, 06:44 PM   #2
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I would try replacing it with a diode of similar physical size.
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Old 26th July 2006, 08:35 PM   #3
kubeek is offline kubeek  Czech Republic
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It also could be some zener diode, so better look carefully at the circuit and try to find out what was it there for.
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Old 26th July 2006, 09:03 PM   #4
Netlist is offline Netlist  Belgium
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To be real sure you need the service manual and part list.
However, this might be of any help:
N16 = SM-1XN16 =SM-1XN02: 1600V
SM-1XN02: Gl, Uni, 200V, 1A
Can be replaced by:
DM513, EM516, GP10Y, RGP15-16

/Hugo
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Old 26th July 2006, 09:53 PM   #5
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Is there other diodes on the board with the same markings? You could pull it off and run some tests on it to see what it is for sure.
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Old 27th July 2006, 12:05 AM   #6
Enzo is offline Enzo  United States
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Diodes are usually called out as CR or D numbers on schematics.

D is obvious - diode

CR is an old term that hangs on by tradition - it means Crystal Rectifier.

In your case, what does the diode do in the circuit. In the preamp it is unlikely to be a tunnel diode or something, so it is either a rectifier or blocking device, or it is a zener.
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Old 27th July 2006, 02:34 PM   #7
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This may be the only image available of the little culprit on the web.
Click the image to open in full size.
But this is exactly what it looks like. Component without leads is 2.5mm x 3.5mm. Mine is off-white with a brown band at the cathode end.

There are half a dozen more of them on the board, all hitachi, with varying numbers (values?) on them.

This is really starting to worry me.
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Old 27th July 2006, 05:00 PM   #8
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I measured .60v drop across the diode.
Someone suggested this is in the range
of a common silicon switching diode.

But they also suggested that in matching
it I pay attention to the peak inverse voltage,
peak fwd current, and Trr (reverse recovery time)
/ switching time.

Good lord. This is troublesome little
devil.
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Old 3rd August 2006, 02:30 PM   #9
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"There are half a dozen more of them on the board, all hitachi, with varying numbers (values?) on them. "

These could be zener diodes, with differing voltages. Remember, most zener diodes have a forward voltage drop of 0.7 V, it is the reverse voltage that is the diode's 'Voltage'

Richard
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Old 3rd August 2006, 03:54 PM   #10
Netlist is offline Netlist  Belgium
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What is the type# of the amp?
I might have some data.

/Hugo
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