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Rf design We are not able to get 70W from RD70HHF1 IC. Only 16W is coming and IC is getiing heated too much

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About my icom ic 2100 no transmital but linear ic & drive is good. is their any other parts that may cause this trouble? tnx & regards...


First thing to try is to read the DC voltage with the PTT pressed on Pin 2 of the RF amplifier "brick". It should be somewhere around 6 volts. If it's way high or zero, it's likely that yours is one of the victims of a design flaw wherein Q19 on the underside of the main board (and right next to Pin 2 of the RFPA module) fails. It usually fails due to heat. It's a well-enough problem that, were you to send it in to Icom for repair, it would likely be repaired and have an undocumented heat sink panel affixed to its back. For awhile, an internal memo at Icom service instructed techs to make the repair and blame the failure on high antenna system SWR, and then charge the customer big $$ for it. Incidentally, when the radios come back, they now have that little heat sink installed on the replacement transistor.
I've had 6 of these radios come across my service bench for that very problem. It's a pretty easy fix once you know to look for it.
BTW, it's also possible that one of the PIN diodes in the T/R switch has failed open, but not nearly as likely as Q19.
I've also found the stock chassis heatsink fin area to be insufficient to dissipating the heat from even medium power operation, so for my own radios (I've got 4 of these in service) I have put quiet 12 vdc muffin fans on the heat sinks to help keep the radios running cool. Many users believe the relatively massive heatsink area of the outer chassis is enough to dissipate the heat produced by the final PA block, but any time I can't stand to rest my hand against a heat sink because of its temperature, I have to wonder just how badly the components producing that heat are suffering, so I opt for the fan.
HTH es 73,
Barney KL7HNY

Dec 25, 2016 | Radio Communications

1 Answer

Hello I have a Beko DRCT 70w.When i turn it on to


you have a bad air flow problem...try takeing your vent hose of and run a load to see if it dryies faster

Oct 03, 2013 | Dryers

1 Answer

Icom ic 7600 rf issue


it is just because your cable is loose, try it after tightning it up

Jun 05, 2012 | Icom IC-7600 HF/6 Transceiver

1 Answer

My mobile are swithed off when i attend the call.and after these problem one one more problem r create.my n95 was fully white screen..plz help me


your first problem is phone off when attending a call
solution for this problem 1. change battery to original one 2. if not solved it has get hi current on RF IC so you have to change the RF IC second problem come from your first problem it is software problem because your phone not shutdown (so auto off) flash your phone to solve it

Dec 08, 2010 | Nokia N95 Cellular Phone

2 Answers

My tv has a line threw the middle of it...the picture will come on but only if you move the tv.


Sounds like you may have a bad solder connection on the vertical ic, it is a small ic connected to a heat sink near the flyback. Usually a 5 pin ic, look on the solder side of the board for a solder connection with what looks like a ring around the pin.

Sep 02, 2009 | Sharp Televison & Video

1 Answer

Nokia e51 network problem


i am you sing the nokia e51 but that problem in network you sing vodafone sim

Jun 13, 2009 | Nokia N70 Cellular Phone

1 Answer

Magic focus 4 error


Error 4 is listed as an overflow in the convergence section.
To fix:
1. Check the placement of the sensor
2. perform an Adjustment check of th H/V size & centering
3. Conv. amp. gain check, check these resistors:
R041, part # 0790024R, RES.CHIP 1/16W 100 OHM
R046, part # AQ00164R, RES.CHIP 1/16W 75 OHM TAPE
R050, part # 0790059R, RES.CHIP 1/16W 47K OHM
R058, part # 0790054R, RES.CHIP 1/16W 18K OHM
R062, part # 0790047R, RES.CHIP 1/16W 5.6K OHM

May 16, 2009 | Hitachi 53UWX10B 53" Rear Projection...

3 Answers

My cellphone nokia 3350 no signal


try to clean the antenna terminal and reheat the RF ic.

Feb 27, 2009 | Nokia 3350 Cellular Phone

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