Does anyone know where I can obtain a datasheet for a R/W hybrid C 251853-01 / 251853-02
or H36A2U57
These are used in 1571 and 1541 (pcb 250448).
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Does anyone know where I can obtain a datasheet for a R/W hybrid C 251853-01 / 251853-02
or H36A2U57
These are used in 1571 and 1541 (pcb 250448).
I doubt you'll find one. ![]()
These were custom ICs only used in these drives manufactured especially for C=, unlike the R/W-Amps in the 1541-II and 1571CR.
But you'll get an idea of the schematics looking at the schematics of the old drives (longboard).
I think the best you can get is the 1571 service manual, which describes it partially (pp. 4-8).
Cf, for example, Bitte melde dich an, um diesen Link zu sehen. or Bitte melde dich an, um diesen Link zu sehen..
If I understand it correctly the 20 pin Gate Array is a different IC and has nothing to do with the R/W-Hybrid.
It's the 40/42 pin IC, isn't it? That one is described there, too (but not very complete).
No, the 1541B/1571 has got three of them, IIRC:
All of them have different MOS part numbers.
Can't edit anymore
... have to post again.
No, the 1541B/1571 has got three of them, IIRC:
All of them have different MOS part numbers.
Additional information:
See the schematics of the 1541B at Bitte melde dich an, um diesen Link zu sehen.
Detail showing the three ICs:
Bitte melde dich an, um diesen Anhang zu sehen.
The schematic of the 1541A is found here: Bitte melde dich an, um diesen Link zu sehen.
It shows the discretely built up analogue part:
Bitte melde dich an, um diesen Anhang zu sehen.
So this is what roughly should be inside the Hybrid IC. ![]()
Thanks
The h36a2u57 would be an equivalent of 251853-01
I noticed this shop has h36a2u57 has it listed for as a vcr hybrid ic.
Bitte melde dich an, um diesen Link zu sehen.
At least it looks alike. Hmmm ... very interesting ... this would imply the Hybrid IC is a standard component. I have always thought it's custom made for Commodore.
Maybe the data of this shop is incorrect! The part is listed as AKAI but it is built by Matsushita/Panasonic!
Maybe the data of this shop is incorrect! The part is listed as AKAI but it is built by Matsushita/Panasonic!
As long as it's the one shown in the picture... ![]()
The h36a2u57 would be an equivalent of 251853-01
The H36A2U57 is the equivalent of the 251853-02
the H36A2U57D is the equivalent of the 251853-01
@Bitte melde dich an, um diesen Link zu sehen.: Why do you need the datasheet? What exactly do you want to know?
@Bitte melde dich an, um diesen Link zu sehen.
I would like to know how it actually functions / works.
I have already asked Panasonic but, they do not have the datasheet, as it maybe obsolete, going by their reply.
I would like to know how it actually functions / works.
The schematics above ...
Bitte melde dich an, um diesen Link zu sehen.
... will show you how it works.
FWIW ...
The h36a2u57 would be an equivalent of 251853-01
I've got a 1571-Board on my workbench with a H36A2U57 on board. Since the 1571 uses a 251853-01 they seem to be equivalent, yes.
The H36A2U57 is the equivalent of the 251853-02
the H36A2U57D is the equivalent of the 251853-01
Where did you find this information?
Any info on interchanging -01 and -02?
Any info on interchanging -01 and -02?
OK, found it in the "Tech Topics" here Bitte melde dich an, um diesen Link zu sehen.
Interchangeable, -02 need two resistors and four diodes more.
I've got a 1571-Board on my workbench with a H36A2U57 on board.
This one is pretty sure a -01, looks different from a spare -02 I've got here.
Can you take pictures, pls? I am interested in how it looks like, thx.
Btw, when you change -02 with -01 you don't need to remove the parts that are needed for -02. The unit works fine when you let the parts inside.
I'll take some pics tonight.
The spare -02 is single sided and labelled "251853-02".
The two soldered H36A2U57 are labelled "H36A2U57" (sic!) without "D" and have no resistors at pins 9/10, so I strongly guess they are -01s. But the look different from each other, too... however they are double sided.
Bitte melde dich an, um diesen Anhang zu sehen. Bitte melde dich an, um diesen Anhang zu sehen.
Funny: middle and bottom item show virtually no difference, both single-sided, components on rear side seem exactly the same.