[Elecraft] KIO2 no oscillator

Sun Aug 10 16:11:00 2003

Hi

This is almost always a problem with the toroid leads although a bad 310 =
FET will show up sometimes double check the toroid leads to make sure =
they are stripped and soldered correctly

Don Brown
KD5NDB
  ----- Original Message -----=20
  From: Bob Hawkins=20
  To: [email protected]=20
  Sent: Sunday, August 10, 2003 2:34 PM
  Subject: [Elecraft] KIO2 no oscillator

  Hi,

  I completed KIO2 this morning and started the testing. The radio (K2 =
#606
  with most options) is fine. The mod to the control board (Rev A) is =
OK.
  Side tone is OK.

  The KIO2 is DOA. Voltage on U2 pin 1 is supply voltage. Voltage on Pin =
9 is
  4.97 V. Voltage on pin 8 is 0 (actually tests as 0.12 V positive =
decaying
  to 0 on the voltmeter). There is no trace of the 16 MHz oscillator =
signal
  on the K2 and on an external radio tuned to 16.29 MHz. The oscillator =
is
  not running.

  Checking the two boards, I found only one broken wire (ground wire on =
cable
  end on KIO board). Repair changed nothing on the KIO2. The manual =
trouble
  shooting says if oscillator DOA continue with voltage tests...what =
tests?
  All that appears is the software testing part.

  The interface is drawing no current. Front panel current when =
interface in
  is 0.30 A. When interface is out current is 0.30 A.=20

  The voltage table on page 23 provides voltages but no clue. D1, D2 and =
D3
  are O V on both pins. D4 is normal. The pins of U2 are nominal. The
  voltages on Q1 are 6.87 V (supply is 14.6 V) on the pin nearest the =
back
  edge of the board (S by the diagram on the back page). The other two =
are
  nominal and 0 V. The voltage on both sides of R2 are the same =
(nominal)
  indicating no current flow on that line.

  Help is needed.

  73

  Bob Hawkins ve3agc

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