Re: No power up


Max
 

Is this a know problem or did you find these defective components through your own trouble shooting? Either way, good job on the repair.

Max KG4PID


On Tuesday, January 4, 2022, 10:00:19 AM CST, W1JCW <w1jcw@...> wrote:

Here is what I found with about 3 hours of TS.

 

Disassembled Display unit and replaced defective surface mount C501 and C502.

 

Removed Main unit and replaced defective surface mount R2011.

 

Very surprised these failed due to age as this was the last release when they were discontinued.

 

73-

W1JCW

John

 

Join my new SteppIR Antennas IO group by sending an email to:

 

SteppIREngineeringandRepair+subscribe@groups.io

 

 

From: ic7000@groups.io <ic7000@groups.io> On Behalf Of J.D. Barron
Sent: Thursday, November 25, 2021 10:26 AM
To: ic7000@groups.io
Subject: Re: [ic7000] No power up

 

Sounds like the dreaded Click - Click failure where a cap shorts in the control head and drops the CPU that has to communicate with the digital unit in the main unit. 
Sometimes this is an easy fix and sometimes not. 
First try cleaning the panel connectors (you may be lucky).
There are two regulators in the head that provide the +5 and 3.3 volts for the head processor.
What happens is you get the power up signal to pull in the relay and then the CPU in the main unit has a few seconds to get a serial signal from the head to turn the rest of the radio on. Without this signal from the head the relay drops out.
This is repairable and is sometimes easy and sometimes not.
Often it is a cap in the regulator circuit that has shorted and this does require some troubleshooting and can (as I have learned) relatively easy or (in my one case) impossible).
If you Google IC-7000 click - click you should get a number of hits that will guide you in your endeavors.

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