Kenwood TS-850S Bedienungs- und Sicherheitshinweise

Andere Handbücher für TS-850S

10

Inhaltsverzeichnis

Andere Kenwood Radio Handbücher

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PRESIDENT

PRESIDENT TEDDY R. Bedienungsanleitung

TS-850S REPLACEMENT OF D31 AND D4-D5-D6

copyright 2005 B&B Technical Services. All rights reserved. May be reproduced for personal use only. We are not responsible for loss

or 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 showing

more 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 more

bands.

Fix: Replace affected components on opposite side of RF unit board. These are all type RLS-135

diode. No substitutes are recommended.

Remove power cable and covers of rig. Invert rig. Remove the shiny cover near the rear of the

RF unit (left hand board as rig faces you). Remove the flex connectors on the side of the board

leading to the IF unit. Remove other coax connectors as needed; MARK THEM to ensure that

they go back in the right places. You should be able to fold the board toward you and then to the

right 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 OF

RF UNIT

RF unit is on the left side

of the bottom of the rig

as it faces you.

FIG. 2 LOCATION

OF D31 ON RF

UNIT

Next, using Fig. 2, located D31.

Using a GROUNDED temperature-

controlled soldering iron and some

de-soldering wick, remove the solder

from both ends of the diode. With the

soldering iron still in contact with one end of the diode, the adhesive holding the diode to the

board should loosen and the diode should be able to be gently pried up with the solder iron tip.

Note the orientation of the diode; replace it with the new diode and re-assemble the radio.

If this does not cure the problems, there may be other diodes leaky or shorted on the RF unit;

these will most likely be D4, D5 and/or D6, located near D31. They are also of type RLS135.

Again, no substitutes are recommended. Use Fig. 3 to located D4, D5 and D6. Others up the line

may also be bad but this is rare.

Fig. 3 D6, D4, D5

LOCATION ON

RF UNIT

Note that D31, D4, D5, D6 and the rest of the filter switching diodes can be checked IN

CIRCUIT with a DVM using the “diode” range. Forward voltage should read from 0.6 to 0.7

volts; reverse should read nothing or open. Other bad diodes may be located this way if needed.

The other diodes on the board that are not associated with the RF switching may not read

correctly in-circuit; however, these have not been known to fail.