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KRO-7701RY/787/807/887RIX957/PS987R
COMPONENT DESCRIPTION
Synthesizer unit (X14-592x-xx, 6042-7x)
Component
Purpose, Function
Operation, Condition, Compatibility
IC1
uCOM system control
IC2
E-Vol, NC, MPX
;
IC3
Variable 3-pin regulated voltage supply
IC4
Power IC
IC5
IC for System E's
IC6
DC/DC converter
IC7
4 V pre-out audio amp
IC8
4 V pre-out audio amp
IC9
4 V pre-out audio amp
IC10
Muting logic circuit
1C11
RDS demodulator
IC12
Noise amp
IC13
C and mask mechanism motor driver
IC14
E2PROM
IC15
Reset IC
IC16
Spectrum analyzer audio amp
IC17
Spectrum analyzer BFP
1C18
Spectrum analyzer data SW
Q1,2,3,4
Pre-out muting
Muting is ON when base is "H".
Q5,6
Non-fader pre-out muting
Muting is ON when base is "H'.
CH2 control SW
Q26,27
Back-up detection
Acc detection
Antenna control
CH2 is ON when base is "L" (when CHCON2 is "L").
A8V SW
Switched ON when base of Q18 is "H".
A8V AVR
8 V is output when the A 8 V switch turns ON.
Qat ,22
B-U 5 V AVR
5 V output.
Q23
SW5V SW
5 V is output when base is "L".
Absence of back-up voltage is detected when base is "L".
Absence of Acc is detected when base is "L".
ON when base of Q27 is "H".
Q28,30,31
P-CON SW
Switched ON when base of Q31 is "H".
Q29
P-CON protection circuit
Activated when P-CON output is grounded.
Q32
Dimmer SW
Dimmer is ON when base is "H'.
Q33
Ilum AVR
Illumination power output.
Q35,36
14V SW
Outputs 3W, 14 V when base of Q35 is "H".
Q37,38
Motor driver AVR
Motor driver power output.
Q39
EX amp SW
EXT AMP CONT goes "H" level when base is "L".
Q40,44
Illum AVR SW
Switched ON when base of Q40 is "H".
Q41,42
C mechanism main motor power SW
Switched ON when base of Q41 is "H".
Q43
Sub-motor voltage SW
Cassette mechanism is selected when base of
Q43 is "H" and Mask mechanism is selected when it is "L".
Q51
SVR discharge circuit
ON (discharge) when base goes "H" due
to momentary power down.
Q55,56
DC-DC converter AVR
DC-DC converter power output.
Q57~62
+/- differential stabilizer circuit
Q71
Pre-out muting SW
Muting is ON when base is "L".
Q72
IC2 muting SW
Muting is ON when base is "H".
Q82
Forced Wide SW
Forced Wide is set when base is "H".
Q87,89
FM +B SW
Switched ON when base of Q87 is "H'.
Q86,88
AM +B SW
Switched ON when base of Q86 is "H".
Q91
Noise detection buffer
Q92,93
Noise detection output time constant SW | Time constant provided when u-COM AFC pin is "H"
and not provided when it is "L".
Qg4
Spectrum analyzer AGC
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