Hi,
Ironically, the schematic for the rare-as-hen's-teeth HMA-9500 MK2 is easily found on many sites, but I can't seem to find a full schematic for the commonly-found HMA-9500 MK1 anywhere... Does anyone have a copy here?
I suspect it is based on the 2nd diagram in the Hitachi Lateral MOSFET apps data (1st diagram is the HMA-7500 / Maplin amp, with BJT-based VAS - 2nd is a FET-orientated design), but in an ideal world I'd have a schematic to check.
TIA.
NB - looking at photos, the MK2 has a few components that the MK1 lacks, so I am not sure that interpreting a MK2 schematic will be entirely advisable.
Ironically, the schematic for the rare-as-hen's-teeth HMA-9500 MK2 is easily found on many sites, but I can't seem to find a full schematic for the commonly-found HMA-9500 MK1 anywhere... Does anyone have a copy here?
I suspect it is based on the 2nd diagram in the Hitachi Lateral MOSFET apps data (1st diagram is the HMA-7500 / Maplin amp, with BJT-based VAS - 2nd is a FET-orientated design), but in an ideal world I'd have a schematic to check.
TIA.
NB - looking at photos, the MK2 has a few components that the MK1 lacks, so I am not sure that interpreting a MK2 schematic will be entirely advisable.
Not sure if this is the one you're looking for:
https://hubdynamolight.c.blog.ss-blog.jp/_images/blog/_db3/hubdynamolight/kairo-3cfd5.jpg
https://hubdynamolight.c.blog.ss-blog.jp/_images/blog/_db3/hubdynamolight/HMA9500F.jpg?c=a0
https://hubdynamolight.c.blog.ss-blog.jp/_images/blog/_db3/hubdynamolight/kairo-3cfd5.jpg
https://hubdynamolight.c.blog.ss-blog.jp/_images/blog/_db3/hubdynamolight/HMA9500F.jpg?c=a0
Thank you very much. I went through the registration process only to find 'no manual available at the moment'... I would be weary of actually buying anything off this site!
Thank you, Chris! Much appreciated!
Latala - did you download the one Chris linked to, or is there a full manual somewhere? (I hope that doesn't sound ungrateful! I am now in a much better place than I was before I posted here thanks to Chris, and I can find another doorstop instead of the Hitachi)
Latala - did you download the one Chris linked to, or is there a full manual somewhere? (I hope that doesn't sound ungrateful! I am now in a much better place than I was before I posted here thanks to Chris, and I can find another doorstop instead of the Hitachi)
You have to look carefully on this page ther is a print PDGF option that worked for me at no cost
Trev
Trev
Thanks, but the manual you are linking to is for the MK2, not the MK1. Please see post no. 1.
NB - MK2 is very different to MK1.
NB - MK2 is very different to MK1.
Sorry re my error here I have a HitachHMS 7500 Mk 1 that I have used this last 30 years or so and I do agree they are very different re Mk1 and MK11 best of luck with your efforts
Trev
Trev
I found the schematics at https://hubdynamolight.blog.ss-blog.jp/upload/images/201905-2.html, it is originally published in a Japanese science magazine 電波科学 Aug 1977 issue.
Also found Japanese service manual available at auctions.yahoo.co.jp
Also found Japanese service manual available at auctions.yahoo.co.jp
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