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KRC-949D.
CIRCUIT DESCRIPTION
Component
Application/function
Operation/condition/compatibility
Q60
Microprocessor FM output invert
Q61
Q62
Microprocessor FW output invert
Q63
Microprocessor mute output invert
Q64
Q65,66
Tuner display AVR
67
ACC detection
Q68
Microprocessor LW output invert
TAPE/TUNER line prohibition
when band interrupting on TAPE play mode
Q70
Si driver
Q71
Sh driver
Q72
P.Scan inhibition when TAPE mode
Q73
Pre-scaler + B switch
Turns ON when FM mode.
Q74
MTX SC releasing when TAPE mode
Q75
MUTE prohibition when DK mode receiving
Q76
P, Scan switch
Q77
Q78,79
FM/AM + B
9.4V.
Q80
TUNER
microprocessor muting hibition when TAPE mode
Q81
ACC switch (Q28) driver
Q82
AM + B switch driver
Q83
AM + B switch
Q84
AM inhibition
Q85
FM + B switch
Q87
Q88
Q89,90
LW LPF DC amp.
agi
AGC cut
Turns ON when AM seek mode.
Q92
MW/LW select signal
Q93
FM SD invert
LO-PASS input control for LW band
CE control
LO-PASS input control for LW band
Microprocessor SD pin driver
AM SD invert
FM/MW LPF DC amp.
Forced mono invert
ST LED driver
Forced mono detection
AUTO (forced mono)
ST LED driver switch
Forced mono : OFF.
FM detect (display '','')
SK,SD INV.
SK OUT INV.
Q69
LO-PASS input control for FM, MW bands
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