Help for repair Harman Kardon power amplifier HK770

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jsb8350

Member
Joined 2020
#1
Hello,

I have an Harman Kardon power amplifier HK 770 but he have little problem.
This HK770 is buying by my father around 80's but around 97's have problem with it. The power don"t work correctly and out voltage at right chanel and burn the speaker . . . .
I take this for try to repair.

I have one diode burned and cut in two parts. Is the diode D420 (Ref HK : 5632-ERB12-02) Diode, ERB12-02.
When i look on internet is look like Silicon Rectifier Diode from Fuji Electric.
But actually this diode is discontinued.

HK Service manual on my dropbox : [wiki=https://www.dropbox.com/s/52j8lodmxysk9mu/hk-770_SM.pdf?dl=0]%[/wiki]
Datasheet find about the ERB12-02 : [wiki=https://www.dropbox.com/s/6oe1lt8ioyxanqk/erb1202.pdf?dl=0]%[/wiki]

Can you help me for find an equivalent for replace this parts !?
(I don't know what information is important on the datasheet for find replacement parts. Have many type of diode on the market : Diode Zener, TVS, Rectifier, Schottky etc.. and have only HK ref : ERB12-02).
I put picture of the diode on my dropbox :
Pic 1 : [wiki=https://www.dropbox.com/s/vygv24ue32bpgig/Diode_1.jpg?dl=0]%[/wiki]
Pic 2 : [wiki=https://www.dropbox.com/s/5fpj3424l1j5sj9/Diode_2.jpg?dl=0]%[/wiki]

Thanks for the help

Best regards
 
#3
Thanks duncan2 for the help,

I have question about your purpose, on the datasheet ERB12 the Non-Repetitive Peak Forward Surge Current IFSM is 60 A and on the diode 1N4003 the FSM is only 30A.
This is not a problem ?

Best regards
 
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