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KR-V77R
16
CIRCUIT DESCRIPTION
Description of Companents
TUNER
UNIT (X05-353X-XX)
0-10: K,P
0-81: U, UE
Use/Function
Operation/Condition/Compatibility
FM IF amp.
LPF (Low Pass Filter)
Emphasis select
75us when ON, 50us when OFF.
Q7 : FM +B {ON in FM mode), O8 : AM +B (ON in AM mode).
+B power supply select
IC1 (LA1265)
FM 1F/AM detection
§C2 (LM7001)
PLL (Phase Locked Loop)
1C3 (AN7470)
MPX (Multiplexer)
POWER AMPLIFIER UNIT (X07-2360- 12)
Use/Function
Operation/Condition/Compatibility
Forma ____| Primary ste voltage amp
ee
ae
ee
Q18, 19
Protection current detection
AUDIO UNIT (X09-265X-XX)
0-11: K,U, UE
1-02: P
Operation /Condition/ Compatibility
ou!
For MUTE.
Q3,4
:
Turns ON when Q21 is ON or Q23 is ON, to turn O25 OFF
Compatible with 2SC1740S. °
Q26
Transistor switch
Drives O26 to turn the output relay and the surround output
relay ON and OFF.
Driver transistor for the output relay and the surround output
relay.
Transistor switch
Relay drive transistor
For the —12V power supply.
For the —30V power supply.
Turns ON immediately after power ON, and when power is OFF,
to turn the — 30V OFF.
Turns Q1 and Q2 ON/OFF. Compatible with 2SA9338.
Turns 03, 04 and Q11 ON/OFF. Compatible with 2SA933S.
027 ~ 29
Constant voltage circuit
Constant voltage circuit
—30V ON/OFF switch
Muting driver
Muting driver
Video buffer for REC OUT
Video buffer for MONITOR
OUT
Turns ON when surround mode is engaged to turn Q11 OFF.
Compatible with 2SC1740S.
Turns ON when surround mode is engaged.
Turns ON when VIDEO 1 is selected to select IC4.
Turns ON when VIDEO 2 is selected to select 1C4.
Turns ON when MUTE 1 is at a high level, or when forced
MONDO is selected. Compatible with 28C1740S.
Cuts the CLK line except when the CLK for the tuner is at a high
level.
Cuts the DATA
line except when the CLK for the tuner is at a
high level.
| For Tuner unit (X05-}.
;
Surround ON/OFF switch
Surround lamp driver
Switch for VIDEO 1
Switch for VIDEO 2
MONO/ST select switch
Muting for the CLK
Muting for DATA
Ripple filter
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