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AM-FM Stereo Tuner KT-900 (TRIO-Kenwood)

[Outline] [Front view] [Inside view] [Trouble-shoots]

Fig.1 Overview

• FM 4-gang AM 2-gang front end
• Pulse Count Detector
• THD = 0.04% @1kHz Stereo
• Double convert circuit on FM band
  ( 1st. IF=10.7MHz , 2nd IF=1.96MHz )
• 52,290yen in 1981

Trouble	Cause	Repair
No audio signal output on FM and AM band.	AVR output voltage was lower than required because of soldering clack at the power transistor pin.	Re soldering the pins of the power transistor.
No audio signal output on FM band.	No oscillation signal at 2nd local oscillator for 10.7MHz to 1.96MHz down converter.	Replace a capacitor at the LC tunk circuit of 2nd local oscillator.