Braun AM-FM Receiver Model R4 - Questions arround MCU - diyAudio
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Old 27th December 2012, 12:23 PM   #1
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Default Braun AM-FM Receiver Model R4 - Questions arround MCU

This model with Class-H output power stage was released in two versions.

1) The old R4-version (rev.1) uses follow MCU device:
Sampo (made by Hitachi) VSI86009 - "HD-614080S-A89" (HD614080SA89).
This must actually be a custom made part, because there are not to find a datasheet.

2) The second version (R4/2 resp. R4 rev.2, also last version at the same time - so I think) uses follow MCU part from Hitachi:
Hitachi HD4074008S, Sanyo-Fisher Item-No 4091266802
This must actually be not custom made and a good available part, because there are genuine Hitachi datasheets - go to
HD4074008S pdf, HD4074008S description, HD4074008S datasheets, HD4074008S view ::: ALLDATASHEET :::
HD4074008S HITACHI, HD4074008S Datasheet
Additional this type No is mentioned in the book
"The CB PLL Data Book" - for cover image go to
The CB PLL Data Book - Franklin, Lou
and to page 36 and 57 about
The CB Pll Data Book - Lou Franklin - Google Books
If URL don't goes open, try by google the keywords "The CB PLL Data Book" and "HD4074008".
This means, this IC must be in use in several devices like car radios, CB transmitter/receiver and various HiFi systems from the low cost range.

Who can find out, in which models this MCU is in use?

Images of both MCU types you will find in the last two attached pics - found about
Schematic you will find there:

Thank you for advices.

P.S. Who can upload a Service Manual?
Attached Images
File Type: jpg Braun R4 red front.jpg (73.6 KB, 30 views)
File Type: jpg Braun R4 Power Amp Speaker Relais Section.jpg (189.5 KB, 30 views)
File Type: jpg Braun R4 Operating Keyboard disa'ssy.jpg (152.3 KB, 28 views)
File Type: jpg Braun R4 open top view.jpg (163.8 KB, 28 views)
File Type: jpg Braun R4 Nummerierung Front-Rear.jpg (501.0 KB, 26 views)
File Type: jpg Braun R4 RF-PCB center adjust.jpg (116.9 KB, 12 views)
File Type: jpg Braun R4 VAS Stage Area.jpg (630.2 KB, 12 views)
File Type: jpg Braun R4 Voltage Regulators MCU-Device.jpg (82.3 KB, 12 views)
File Type: jpg Braun R4 Sampo VSI86009 - HD-614080S-A89.jpg (117.2 KB, 14 views)
File Type: jpg Braun R4 rev.2 HD4074008S.jpg (85.1 KB, 17 views)

Last edited by tiefbassuebertr; 27th December 2012 at 12:51 PM.
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