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SECTION 1 SERVICING NOTES
PROTECTOR This set has protection circuit and indicators. When trouble occurs, LED indicates status. Each LED lights up in green during normal operation. The color will change green to flashing red when trouble occurred. LED OFFSET (D851) Problem � DC voltages are applied to the SPEAKER OUT terminal (CN812, CN813) � DC voltages out to the SPEAKER OUT terminal cause the internal circuit troubled OVER CURRENT *1 (D852) THERMAL (D855) � The SPEAKER OUT terminal is shorted � The internal output element is troubled � The temperature rises to unsafe level The set heats up abnormally � Stereo operation: 1 to 8 � � Bridging operation: 2 to 8 � Make sure to place the set in a ventilated location (The color will return to green when the temperature returns to normal)
*1: Does not work in no-signal condition.
Solution Turn off the power switch. Make sure the speaker cord and ground lead are securely connect
Turn off the power switch. Make sure the SPEAKER OUT terminal are not short-circuited
TEST TONE To check the system�s status, activate the built in transmitter then press the [TEST TONE] button (S801). If the tone is heard, the set is functioning normally. CANCELLING THE PROTECTOR AT THE SERVICE
Note: When check the protector, do not cancel it.
� PROTECT Board � (Component Side)
+ +
In case of a failure in this set, the protection circuit functions to prevent a speaker damage and turn off the power to stop the set working. To make the set work at the service, disconnect the JW81 of the PROTECT board and turn on the power. Be sure to reconnect the JW81, after the completion of service.
C867
C871
JW81 PROTECT OFF (disconnect) T851
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