Modifications for the Kenwood TH-27



19-07-1998 Keyboard Mods to access AM detector and change band

A full review of the Kenwood TH27a ran in the March Issue 1991 of CQ

This is a very sophisticated HT and now a great bargin
73-AB4VJ



21-04-2000 TH-27A/E Low TX power
Author: Kenwood Communication, inc.


Service Bulletin no. 991 (11 May 1992)

We have noticed some variation in the output power provided by Toshiba S-AV22A power modules with a production code of "11". Modules with this production code might exhibit low or no transmitter output power. This procedure will correct this problem.

Parts required:
0.01 µF axial lead capacitor, (C91-0769-05)

Procedure:

  1. Remove chip capacitor C17 and C18 from the TX-RX unit (X57-3640-11).

  2. Install the new axial lead capacitor as shown in the accompanying diagram.

Note: Deleting C17 and C18 alone will not correct this symptom. The new C18 will be used to stabilize circuit performance. Deleting C17 alone will not cure the symptom.

Time required for this modification is 30 minutes or less.