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Author Topic: Kenwood TM-731E power problem  (Read 1245 times)
HG5AZR
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Posts: 0




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« on: January 16, 2013, 03:24:36 PM »

Hi!

1.I have now TM-731E.
I realised that on 144Mhz band the power output is only 35W and 7.5A (13.2V on modul on pin3 at TX) in hi position.VR2 pot(hi power set) is in max position.
Normally power output is 50W.
Is it S-AV17 module failure?

2.  Q2 driver transistor is 2SC2538-09A-A in my radio.On schematic and on service manual is 2SC2538-22A.Why?What is difference?

3.Who can see this transistor in transceiver on 144Mhz final unit?

Thanks
                Zoli


« Last Edit: January 16, 2013, 03:29:48 PM by HG5AZR » Logged
W9GB
Member

Posts: 2622




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« Reply #1 on: January 16, 2013, 07:52:12 PM »

Quote
Q2 driver transistor is 2SC2538-09A-A in my radio.
On schematic and on service manual is 2SC2538-22A. Why? What is difference?
Likely part update/revision from Mitsubishi.

This Mitsubishi part, 2SC2538 is only $3 USD, available from RF Parts.
http://www.rfparts.com/transistors_2SC.html

Quote
Who sells this transistor and power module in 144Mhz final unit?
Kenwood Parts (discontinued)
S-AV17 POWER MODULE 144 TM-231A TM-241A TM-731A TM-732A TM-733A TM-631A S-AV17(KENW-2) $68.00

Toshiba S-AV17 Datasheet
http://www.rfparts.com/pdf_docs/SAV/SAV17.pdf

Repair of the Toshiba S‑AV17 (and similar) RF power modules
By Kevin Custer W3KKC
Edited by Mike Morris WA6ILQ
http://www.repeater-builder.com/kenw...17-repair.html

RF Parts (California) sells these Power Modules
The Icom SC-1091 is a cross-referenced part
http://www.rfparts.com/module.html

RF Parts - Export (Foreign) order info.
http://www.rfparts.com/exportorder.html
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