Kenwood TS-850S Replacement Manual

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Kenwood TS-850S Replacement Manual Manual pdf 1 page image

TS-850S REPLACEMENT OF D31 AND D4-D5-D6copyright  2005 B&B Technical Services. All rights reserved. May be reproduced for personal use only. We are not responsible for lossor damage due to the use or misuse of this information.Symptoms:D31 FAILED: No or low receive and/or transmit. High pitched tone in speaker. RXB showingmore than 0 volts in transmit or TXB showing more than 0 volts in receive.D4, D5 AND/OR D6 FAILED: “Suck out” of RX signal and or TX output on one or morebands.Fix: Replace affected components on opposite side of RF unit board. These are all type RLS-135diode. No substitutes are recommended.Remove power cable and covers of rig. Invert rig. Remove the shiny cover near the rear of theRF unit (left hand board as rig faces you). Remove the flex connectors on the side of the boardleading to the IF unit. Remove other coax connectors as needed; MARK THEM to ensure thatthey go back in the right places. You should be able to fold the board toward you and then to theright side of the rig to work on the back side of the board.Refer to Fig. 1 for location and orientation of the board.Fig. 1 LOCATION OFRF UNITRF unit is on the left sideof the bottom of the rigas it faces you.FIG. 2 LOCATIONOF D31 ON RFUNITNext, using Fig. 2, located D31.Using a GROUNDED temperature-controlled soldering iron and somede-soldering wick, remove the solderfrom both ends of the diode. With the

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