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KRC-851D
CIRCUIT DESCRIPTION
SYNTHESIZER UNIT (X14-285)
Use and
Function
Operation
and Condition
TAPE
EQ amplifier
| DOLBY B/C type
1/2Vec buffer
|
Power
amplifier
BTL Output
PLL
~
For Synthesizer
Tuning
|
CO-CH
interface
Data
Buffer
8,9
|
Voltage
detection
SV for
I1C12
10
T.ADV
a
' Between-tunes
Detection
11
Mecha.
sub
moter
driver
12
4
Microprocessor
| Key
input,PLL,LCD
control
14
i AVR
_
| Veo for audio,tuner
15
ACC detection
' For muting
Q1,2
| E€Q mute
Q3-6
|
Audio mute _
Q7,8
'
LOUDNESS
SW
Q9,10 | VOL.boost SW
Q11,12
Buffer
ets
Power
amplifier
input
Lo/Dx SW
For AM
Q14
LPF
ee
For PLL
Q15,16
TUNER +B SW
7
| Q1S:FM
Q16:AM
Q17
/ AM BS driver
Q18
| AM AGC cut SW
For AM
Q19
|
SK tamp inhibit SW
Q20
| ST IND. driver
Q2)
FM MUTE
inverter
i SEEK STOP signal
Q22,23
; SD signal
inverter
| SEEK STOP signal
VCC SW for PLL LPF
Q25-28
|
P-CONT.
Q31
[ DIMMER inverter
DK/RST
out
inverter
RST
in inverter
Q34
|
CD-CH
DATA
inhibit
|
Q34,36 driver
CLK
inhibit
Q37
CD-CH CONT buffer
Q38
|
CD-CH
REQ buffer
Q39
RESET
Q40
;
POWER ON SV SW
Q41
POWER ON SW
| Active
LOW
Q42,43
j; 9.6V AVR
Q44-46
| T-ADV SENS.
SW
ie.
Q47,48
j_AVR for SUB MOTOR
_ | 10V(Kick:14v)
Q49
i
KICK
SW
i
Q50,51
|
MANUAL
RESET
4
Q52,53
SK/VALET,DK
SW
' Key matrix
control
Q54,55 | DINMER SW
Se
T
|
+—
|
:
+
|
|
|
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