Dilshan R Jayakody’s Web Log

Panasonic RX-5090T is quiet old combo box from Matsushita Electric and its most notable feature is powerful three band SW tuner. Recently I got some RX-5090T unit and its problem is distorted audio output. PCB and mechanical component distribution of Panasonic RX-5090T combo box After careful examination we identify C128 (100 µ F / 10V) and C224 (3.3 µ F 25V) as defective components. In this unit, VR103/203 (20K Ω ) potentiometer is also defective and because of that we got some random distortions when we try to change the volume of the receiver. To fix this issue we disassemble the potentiometer and clean it using isopropyl-alcohol (this potentiometer is not available in local market and only option is to clean it and use it again). After these two fixes receiver starts to work again. Mainboard of Panasonic RX-5090T combo box Schematic diagram of Panasonic RX-5090T is quiet difficult to find in the web and we share copy of it in here .

I have Panasonic DMR-E55 DVD Video Recorder and suddenly it start to get reboot when the system performs “Self Checking”. Because of this reboot problem I may not be able to record DVDs and need to put some extra effort to eject the disks. Most of the times this reboot occurs in cyclic pattern and to break this cycle I need to be eject the DVD disk manually from the system. While examine the system my primary attention moves on to the “Digital RAM card” of the system (Because it actively involves in to the DVD burning process). But after the 2 weeks of continues inspection I found that the problem is in the SMPS primary chip - STR G6535. After replacing the STR G6535, system starts to work in an order. Replacement of this chip is not a complex process but while doing that it is necessary to put some attention about the SMD components located nearby.