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KR-A4010
CIRCUIT DESCRIPTION
1. Description of Components
CONTROL UNIT (X11-265X-XX) 0-10: K,P 0-21:M 2-71:X,T,E
Part No.
Use/Function
Operation/Condition/Compatibility
IC1
pPD7538AC-041
Micro computer
IC2
PST529C
Reset
Q2
2SA733 (A) (Q,P)
Cannel space selection
ON : 9kHz, 50kHz
OFF : 10kHz, 100kHz
2SA933S (Q,R)
Q3
2SA733 (A) (Q,P)
Indication driver
TUNED display
I 2SA933 (Q,R)
Q4
2SA733 (A) (Q,P)
Indication driver
STEREO display
2SA933 (Q,R)
Q5
2SC945 (A) (Q,P)
LED driver
For PHONO
2SC1740S (Q,R)
RECEIVER UNIT (X14-254X-XX)
0-10: K,P 0-21:M
0-71:X
2-71:T,E
Part No.
Use/Function
Operation/Condition/Compatibility
| 1C1
LA1265
FM/AM system IC
FM IF amplifier detection and control : AM mixing, IF amplifier and derection.
IC2
CX-79258
PLL IC for frequency synthesizer
PLL for electronic tuning.
IC3
AN7470
MPX IC
MPX demodulator.
IC4
NJM4558D-A
Equalizer amplifier
Equalizer amplifier for PHONO (MM).
M5218P-A
IC5
LC7820
Input selector SW
Analog switch for input selector switches.
C7
STK4172/2
Main amplifier
Main amplifier (2ch). (K,P,M,X type)
1C7
STK4171/5
Main amplifier
Main amplifier (2ch). (T,E type)
IC8
PC7812HF
Constant voltage power supply
3-pin regulator for the +12V constant voltage supply.
Qi
2SK241
RF amplifier
High-frequency amplifier. (K,P,M,X type)
Qi
2SK73
RF amplifier
High-frequency amplifier. (T,E type)
Q2
2SC1923 (O)
Mixing
Frequency converter.
Q3
2SC1923 (R,O)
OSC
Local oscillator.
Q4
2SC1923 (R,O}
OSC buffer
OSC OUT (oscillator output) for synthesizer.
Q5
2SK161 (Y,GR)
OSC buffer
For local oscillator input to mixer. (T,E type)
Q6
2SC1923 (R,O)
FM IF amplifier
10.7MHz amplifier.
Q7
2SC1845 (F,E)
LPF
Low pass filter for PLL.
Q8
2SC1740S (Q,R)
LPF
Low pass filter for PLL.
2SC945 (A} (Q,P}
ag
25C1740S (Q,R)
Buffer
Buffer for L6 (T,E type)
2SC945 (A) (Q,P}
Q10,11
25C1740S (Q,R)
Emphasis switch
ON for 75s, OFF for 501s. ( M type)
2SC945 (A) (O,P)
Q12
DTC124ES
FM + B control
Q13
DTA114ES
FM + B control
Q14
| DTC124ES
AM + B control
Q15
DTA114ES
AM + B control
Q17,18
25C2878 (B)
Muting
TAPE REC OUT pop noise prevention during switching selector switch.
Q19
2SA933S (Q,R)
Muting control
Main amplifier pop noise prevention during switching selector switch.
2SA733 (A} (Q,R)
Q20,21
2S$C2878 (B)
Muting
Main amplifier pop noise prevention during switching selector switch.
Q22
2SA933S (Q,R)
Muting control
2SA733 {A} (Q,P)
Q25
2SA933S (Q,R)
Muting
Main amplifier pop noise prevention during switching power switch.
2SA733 {A} (Q,P)
Q26,27
2SC1845 (F,E)
Protection
Q28
2SA945 (L,K)
Regulator power supply
Output transistor for 24V control voltage supply.
Q29
2SA933S (Q,R}
Error amplifier
-12V error amplifier.
2SA733 (A) (Q,P)
Q30
2SA945 (L,K)
Constant voltage circuit
-12V
Q32
2SC2003(L,K)
Regulator power supply
Output transistor tor 5V constant voltage supply.
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