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Author Topic: Icom IC-735 Panel Lamps  (Read 2524 times)
N6CIC
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Posts: 32




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« on: September 01, 2009, 10:49:12 PM »

A couple of the panel lamps on my IC-735 have gone out. Does anyone know if there is a suitable replacement I can pick up at Radio Shack?
Thanks, 73s, Scott, N6CIC
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KZ1X
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Posts: 3227




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« Reply #1 on: September 02, 2009, 06:45:07 AM »

According to the service manual for that radio, the lamps are someone's part # HRS4200A.  Of course, since these date from the early 80s, there's no web reference for them.  I might hazard a guess that Hirose used to make bulbs in those days (I vaguely recall that anyway) but they probably sold that division ages ago.

Looking at the schematic, the bulbs seem to be driven off the collector of Q3 on the display board; the emitter of the 2SB562 comes off the internal 13.8V rail.  So at most you're a diode drop below the input voltage, and this circuit looks like it's a dimmer driver so it could be less than that.

Oh, you wanted to know if you could get the bulbs at RadioShack.  ;-)

I doubt it; the physical dimensions and wiring of the lamps are quite specific to this assembly ... you could try RS part # 272-1141 if you want to ... but that's the least of your problems.  Wait until you see what you have to do to get to those bulbs!
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WB4JZY
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Posts: 61




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« Reply #2 on: September 02, 2009, 06:53:46 AM »

I put a dropping resistor and an white led in place of all the bulbs.  Looks wonderfull.
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K0BG
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« Reply #3 on: September 02, 2009, 07:09:35 AM »

At less than a $1 each at Icom parts, why would you bother?

Alan, KØBG
www.k0bg.com
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K2DFC
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Posts: 40




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« Reply #4 on: September 02, 2009, 07:25:42 AM »

There is a post on the QRZ forum about this. WA2UAH found them at a company in New Jersey called Bulbworks. Bulbworks.com, part number, bw.8640.

K2DFC
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N6CIC
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Posts: 32




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« Reply #5 on: September 02, 2009, 09:42:35 PM »

Thanks to all for your suggestions.  I decided to go the white LED with dropping resistor route.
73s, Scott, N6CIC
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WB4JZY
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Posts: 61




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« Reply #6 on: September 03, 2009, 06:37:20 AM »

"At less than a $1 each at Icom parts, why would you bother?"

Because it looks better than the green bulbs and with the Led's I won't have to "bother" again.
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KG4KGW
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Posts: 2




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« Reply #7 on: January 24, 2013, 09:33:06 AM »

I know this is a very old thread (2009) but it seems relevant to update since I just ordered these lamps today from Icom America.

Not everyone is working on their own personal equipment. In my case a neighbor who truly loves the radio asked me to change the lamps for him. 3 of the four were out. Yes it is a major pain to get to these to change them.

While your changing them you might as well change out the CR-2032 battery in the radio as well. Odds are it is going to need it.

These lamps are now about $4 each, plus tax in some states (FL is a taxable state for Icom).

This is not an ordinary lamp as it is leaded and has a frosted glass envelope. Replacing with a white lamp will work just fine, but purists want the radio to be just like the day they bought it.

HRS-4200A replacement part for IC-735 DS3, DS4, DS5, and DS6. Item part number is located on page 9-2 of the service manual.

Icom America parts department was able to quickly look up the part and I placed the order over the phone.

Icom America Parts Department -1-800-346-0495

The rep was very nice and knew exactly what was needed. I highly recommend their service department when replacing these lamps.

Again, sorry for the super old thread post. If anyone else has one of these radio's this information may be helpful.

http://www.elevatedwire.org/forums/files/file/45-ic-735-service-manual/ Here is a copy of the service manual. No I didn't write the out of band modification on the book.
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N4NYY
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Posts: 4742




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« Reply #8 on: January 24, 2013, 11:11:50 PM »

LEDs: http://gloucestercountyarc.weebly.com/the-elmers-shack.html
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KG6BRG
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Posts: 116




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« Reply #9 on: January 25, 2013, 07:35:34 AM »

A couple of the panel lamps on my IC-735 have gone out. Does anyone know if there is a suitable replacement I can pick up at Radio Shack?
Thanks, 73s, Scott, N6CIC
Scott, if you are still Auga Dulce drive to All Electronics in Van Nuys, at the corner of Oxnard and Kester, just off the 405 freeway.  They have an assortment of lamps and LED's.  If you were not aware of All Electronics that is.   cheers.
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AD6KA
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Posts: 2232




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« Reply #10 on: January 25, 2013, 09:19:25 AM »

Quote
KZ1X:
you could try RS part # 272-1141 if you want to ...

I used this exact part to replace the meter lamps in my TS-940S.
Yes, I could have gone with the factory part for $6 a pop
plus shipping but I passed. I considered using an LED
or "Extra Bright" LED but passed. Many of these LED's
tend not to be omnidirectional in where they throw the light,
though admittedly I did not try them.
Quote
but that's the least of your problems.  Wait until you see
what you have to do to get to those bulbs!

Indeed.
Never been behind the front panel of an IC-735,
but if it's anything like tilting back the front panel
of a TS-940, easiest is nice.  Cheesy This RS part has nice
insulated leads for an easy install.


Good luck with your project.
I still wonder what the meter lamps on my 940S
would look like with a colored LED lighting them,
and which color....maybe blue would be cool?
73, Ken  AD6KA
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K8AXW
Member

Posts: 3638




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« Reply #11 on: January 25, 2013, 09:22:27 AM »

BRG:  Close, but....  I've discovered a product sold by Allelectronics.com that is almost what would be perfect for replacing panel/meter bulbs.

12 VDC LED LIGHT STRIP, COOL-WHITE
 Bright, flexible, easy-to-use LED light strip. Ultra-bright, white surface-mount leds on a flexible, 8mm wide, adhesive backed ribbon. Ideal for accent lighting in auto or home. Also great for unde...
Read more
CAT# LS-12-CW
$2.35 3-led segment

These very small, square LEDs come 3 on a strip segment and you can order any length segment you wish.

The LEDs are ultra-bright at full brilliance you can barely look at them.

The segment(s) has its own dropping resistor so  the segment(s) can be run right off 13.8VDC.  If your panel lamp runs on AC, rectify it and go. If you control the voltage the intensity can be varied to your taste.

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AD6KA
Member

Posts: 2232




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« Reply #12 on: January 25, 2013, 01:51:54 PM »

If you live in the So Cal area, All Electronics in Van Nuys,
as said, is a terrific place to shop for parts and accessories.
Great selection of resistors, diodes, caps, PC board
stand offs, hardware, etc. All loose in bins, so if you only
need one or two, you only have to buy one or two.
Lots and lots of LED's, as stated above.
Great selection of wire and cable too, in spools
or by the foot.

Prices are ALL very good to excellent.
6 foot RG-59 BNC cable at Radio Shack: $10.49
6 foot RG-59 BNC cable at All Electronics: $3.25
(And better quality)

If you've never been there, allow yourself at LEAST an hour. Cheesy
Be sure to get on their print catalog mailing list,
but remember: They have tons of stuff in store that
never makes it into the catalog.

73, Ken  AD6KA
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