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Care and Feeding an Icom PW1

W6DE

Page 6

Copyright 2017, All rights reserved.

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Содержание PW1

Страница 1: ...ing the ALC level is not the Icom recommended method While I believe this is a safer method to adjust the PW1 ALC you follow this advice at your own risk Here is how I adjust the ALC 1 rule Never use...

Страница 2: ...and your exciter power lever is around 35 to 40 watts out ok maybe 50 watts on six meters If you can t get 1000 Watts out of your PW1 with 35 to 40 Watts drive something is misadjusted or broken Ther...

Страница 3: ...ime until you have a PW1 failure Icom specifically states in their documentation NOT TO DO THIS Please note this is when will the failure occur not an IF the problem can occur Yes this means if you ha...

Страница 4: ...s don t operate fast enough and the High SWR reflected voltage will arc across the isolation relay contacts and blow out a clamp diode and the driver chip Note DXLab suite logging and control software...

Страница 5: ...s power input protection circuitry The Power button on the PW1 is a misnomer The PW1 is on whenever the mains power is connected The Power button more or less acts like a standby operate button Becaus...

Страница 6: ...Care and Feeding an Icom PW1 W6DE Page 6 Copyright 2017 All rights reserved...

Страница 7: ...air will take about a week or two as you figure out what to do what to fix order parts and repair Be sure to work in a static free area Don t do the repair in a house where you are standing on a carpe...

Страница 8: ...recommended with the blinking tuning light you will see the SWR meter vary up and down and eventually peg at full scale as the tuner hunts for and fails to find a match The PW1 tuner is really only in...

Страница 9: ...y the power source swamping resistors R11 R12 If they are cooked you ll probably have to replace the MRF 150 devices on that board Be careful replacing R11 R12 it is very easy to lift the PCB trace on...

Страница 10: ...the back panel You also have to remove the back left corner foot to slide the PA assembly forward required in order to slide the PA forward because the foot s screw protrudes through the cabinet floo...

Страница 11: ...sink Remove the MRF 150 device and inspect both the device and heatsink If you see peaks in the thermal paste you have used too much Wipe off the MRF 150 device leave the paste on the heat sink Then r...

Страница 12: ...very very touchy only about 2 or 3 of the entire range of the pot is used to actually adjust the bias And the pots have high friction so it s difficult to set I tried using a plastic tuning wand scre...

Страница 13: ...It is a general purpose diode being used as a clamp diode I used a fast recovery diode P N 1N5602 Mouser Electronics P N 610 1N5062 It is not always the 50MHz filter relay clamp diode that fails other...

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