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Author Topic: IC-251 Help needed  (Read 2330 times)
WA7KGX
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Posts: 104




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« on: June 14, 2013, 06:18:44 PM »

I have an ICOM IC-251a I am working on.

It is missing one or two of the tiny screws that attach the PLL assembly
to the chassis.  Anyone know the dimensions of the screw?  It has a
rather fine thread.

Also I would like to get a copy of the alignment instructions for the 251a.
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AC5UP
Member

Posts: 3836




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« Reply #1 on: June 14, 2013, 07:04:06 PM »


If you have a junk VCR / DVD player / CD ROM drive / computer, etc...... Chances are you can cannibalize it for the screws.
Asian fabricators rely on two screw sizes almost exclusively and you should find the smaller flavor in many other products. Like a thrift store bargain.

Click this:  http://www.radiomanual.info/ICOM_VHF.html
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W9GB
Member

Posts: 2616




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« Reply #2 on: June 14, 2013, 07:20:40 PM »

Likely a metric threaded screw (M2 or M3).  Computers use M3 x 5mm metric screws for attaching DVD/CD drives within computer cases.
The M3 size in 6 mm length can be found at and Ace or other hardware stores
 that has the Hillman small parts drawers.
http://www.hillmangroup.com/locations.html

Good hobby shops have these smaller metric screws.  eBay and Amazon are filled with suppliers.

MTS -
http://www.angelfire.com/biz2/mts/

Icom IC-251
The IC-251 is basically a more advanced version of the IC-211.
The Main unit is almost the same. The PLL and Logic are very different.
The biggest issue with the 251 is the CMOS logic. It "glitches" and is very static sensitive.
The CPU and Expander are no longer available new.
This Icom radio model is generally it is very reliable, and needs very little maintenance.
http://www.angelfire.com/biz2/mts/Oldies.html
« Last Edit: June 14, 2013, 07:28:41 PM by W9GB » Logged
G3RZP
Member

Posts: 4476




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« Reply #3 on: June 15, 2013, 02:04:46 AM »

Mine has had the 1750Hz repeater tone access fail. I must get around to fixing it - probably an electrolytic gone bad.
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KE3WD
Member

Posts: 5694




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« Reply #4 on: June 15, 2013, 07:28:27 AM »

EIAJ Service Manuals do a very good job of identifying screws, types and sizes in metric for he most part. 

Start with the pictorial and get the screw Part Number identifier for the missing screw(s). 

Then check the Parts List, typically at the end of the manual, for the actual identification of the screw type and metric size. 


73
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WA7KGX
Member

Posts: 104




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« Reply #5 on: November 05, 2013, 09:32:31 AM »

I would like to find a parts list for the 251 -- and the service manual that contains that parts list.
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W9GB
Member

Posts: 2616




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« Reply #6 on: November 05, 2013, 11:42:21 AM »

Charles -

Icom IC-251A/E Instruction Manual (Icom Japan)
http://www.icom.co.jp/world/support/download/manual/pdf/IC-251A_E.pdf

Icom America Parts and Malcom Technical Services (MTS) are the GO TO for Icom parts.
I have used BOTH sources for my older IC-211 repairs in 2007.  
Surprised them, they actually had some parts and manuals -- still in stock.

Parts and Manuals
Replacement parts, service manuals, and instruction manuals may be ordered
from your local authorized Icom America dealer or from Icom America's Parts Department.

Icom America Parts Department
2380 116th Ave NE
Bellevue, WA 98004
+1 (800) 346-0495
Monday - Friday, 8:00 AM-5:00 PM Pacific Time
e-Mail: http://www.icomamerica.com/en/contactusform.aspx?ContactType=PA

Malcom Technical Support (MTS)
Scott Malcom, KA7MEF
5130 Jackson Hwy
Toledo, WA 98591-8680
Answering Service: +1 (360) 864-8438
e-Mail: mts(at)toledotel(dot)com

IC-251A/E Board Layouts
http://www.radiomanual.info/schemi/IC251_pcb.pdf

IC-251A/E Schematic Diagrams
http://www.radiomanual.info/schemi/IC251_sch.pdf
« Last Edit: November 05, 2013, 11:59:27 AM by W9GB » Logged
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