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Author Topic: Hitachi GMK-25FS2 service literature ?  (Read 1184 times)

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qrz

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Hitachi GMK-25FS2 service literature ?
« on: May 13, 2015, 07:21:39 pm »
an Arcade Route op brought this in today- DOA

looking for a schematic as there are a pair of resistors in the SMPS burnt beyond recognition.

startup caps are bad as well. but, of course,  can identify those .

no joy with any search engine .   

anyone ??

TIA

MonMotha

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Re: Hitachi GMK-25FS2 service literature ?
« Reply #1 on: May 15, 2015, 09:26:31 pm »
These are found on Neo 29 cabinets.  Might get you some more info.

I have an operator's manual which includes some troubleshooting flowcharts and other info, but no schematic.  It's also in Japanese.

Would you like me to scan it in?

I can also get you pictures or measurements off known working units if necessary or if you have stuff burnt beyond recognition.

qrz

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Re: Hitachi GMK-25FS2 service literature ?
« Reply #2 on: May 15, 2015, 09:58:59 pm »
tnx
 but, doubt that the chart will be of any use .   even in Engrish
the startup caps were each several hundred ohms of ESR
the resistors in question are also in the primary side and part of a timing network.

should have posted ref#'s.

will try to so do in a couple of days

MonMotha

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Re: Hitachi GMK-25FS2 service literature ?
« Reply #3 on: May 16, 2015, 01:28:21 am »
Crap, I just noticed you said 25FS2, not 29FS2.

I only have the 29".  I have a friend with the 25" version, though, so I can probably get info, but it may take a while as he's super remote and generally uncomfortable with working on monitors.

Of course, if it's similar to the 29", what I have may be useful enough.  Probably not the case for the timing section, though :\

qrz

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Re: Hitachi GMK-25FS2 service literature ?
« Reply #4 on: May 18, 2015, 05:00:49 pm »
the reference numbers to ID are
R905 and
R906

edit:

customer brought in a working unit.
of course, same resistors burnt.  :badmood:
measured as
R905   4.7 ohm .5W
R906   15 ohm .5W

replaced both with a 1 Watt of same resistances, along with 
C902  4.7uF/160 V  replaced w/10uF/250V   105 degree
C906  2.2uF/160 V  replaced w/2.2uF/200V  105 degree

works fine now   ;D










« Last Edit: May 20, 2015, 02:42:33 pm by qrz »