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| KR-V126R
CIRCUIT DESCRIPTION
Description of components
TUNER UNIT (X05-3330- 10)
Component
Use/Function
Operation/Condition/Compatibility
FM IF detector
PLL (phase-locked loop)
AM detector
FM MPX
For power amplification
Power amplifier.
For ALC amplification
Amplifier.
For amplification
Surround matrix.
Clock oscillation
Clock oscillator for BBD IC.
Delay device
BBD IC.
For amplification
Amplifier.
Dolby IC
DOLBY.
For amplification
Amplifier.
Qi
{F amplifier
PLL, Low-pass filter
Q4
5V constant voltage, for PLL
Q5
FM + B select
Turns ON in FM mode.
Q6
AM + B select
Turns ON in AM mode.
Q7
FM + B select
Turns ON in FM mode.
O08
TUNED
indicator, for SD
Turns OFF when tuned.
Q9
Q10
Forced mono select
TUNED indicator, for SD
Turns OFF in forced mono mode.
Turns ON when tuned.
Q11
Forced mono select
Turns ON in forced mono mode.
Q12, 13
Q14, 15
Q16
Buffer for L5
Q17
CATV relay drive
Seek level select
+ B ripple filter
Microcomputer (u-COM) power supply,
for fast OF F
Q23
DOLBY, ALC, for detection
MAIN AMPLIFIER UNIT (X07-2350- 10)
Component
DOLBY, for ALC
Use/Function
Turns ON in CATV mode.
Q15 is ON and O14 is OFF when low.
Lowers the input according to the output level.
ALC output level detection.
Operation/Condition/Compatibility
IC1
Protection
Relay drive.
Qi~4
Primary stage voltage amplification
Q5~8
Primary stage cascode amplifier
Q9~12
Secondary stage voltage amplification
Q13~16
Third stage voltage amplification
Q17,18
Third stage cascode amplifier
Q19, 20
Third stage current mirror
Q21~24
Power amplifier driver
Q25, 26
Protection, current detection
Positive (+) side.
Q27, 28
Protection, current detection
Negative (—) side.
Q29
Protection
Transmits the current detected signal to IC1.
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