R7000

                R7000 Display/Sensitivity Problem

PROBLEM:   ICOM R7000 radios that are used 24 hours a day for a long time 
           (2 years ) when shut off the display will become flaky and it
           is also possible for a lost in overall gain (3 to 40db).

SOLUTIONS: Officially there is ICOM ECO SB# 9288-004, attached below.

           Unofficially from Tech who repairs R7000
           The ECO does help the display problem, but most likely
           it is not the problem. *

* note repairing your own radio my void you warranty and only
  allow a qualified technician to do the job, otherwise damage
  could happen to your R7000.   If the VCO does not track then a
  major alignment would have to be done after. Check the 
  ICOM IC-R7000 Service Manual for more details before starting
  this repair, and to make sure I have not made any typeing errors
  you should get a copy of the ECO from ICOM !

1st SOLUTION:
        Replace  on the DC to DC Board  the following capacitor.
        Check the noise with an oscilloscope on both sides of
        R3, if the noise is not way down on one side then
        replace C2 a 33uf 16V capacitor.   Noise feedback
        can decress the overall sensitivity of the R7000.

        Replace on the Display Board
        C19 and C20 a 10 uf 16VDC capacitor

     I found that on my R7000 C19 & C20 were the cause of my
     display problems.  They are 10 uf eletrolytics capacitors
     that are lemmon yellow pc mounted units, when they go bad
     the base of the yellow caps change to a brown color.

     I put in the following ECO first but it did not help.  If
     you look at the service manual you will see that the ECO
     values are on the schematic but my unit had the old values.
     I suggest that you check the above first, it is a lot easier
     to do, C19/C20 can be done in 10-15 min while the ECO will
     take about a hour.
CONT IN R7000.1