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POWER AMPLIFIER (IC201: LA4620)
The power amplifier is a two-channel amplifier with standby switch.
LED DRIVING
IC301
BA612
LED Driver
LG
RESET CIRCUIT
When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU
then initializes its internal circuit and clears the working storage RAM.
When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU provides APO
signal to the power supply circuit and raises RESET signal to +5 V to reset the DSP, the key controller and
the KO signal generator.
Battery set
VDD
RESET
Reset IC
IC13
RH5VL36AA
POWER
From power switch
To power supply circuit
+
IN11+
3
Input
Amp.
IN11–
5
–
–
4
IN12–
Input
Amp.
+
Terminal
Protection
6
PriGND
Circuit
+
9
IN21+
Input
Amp.
7
IN21–
–
–
8
IN22–
Input
Amp.
+
16
2
NC
DC
LVDD
La ~ Lg, Lp
Q15 ~ Q18
LED Driver
UPD65611GB-019-3BA
KO0 ~ KO3, KO5
KO Signal Generator
VDD
CPU
LSI14
HD6433294A19F
-NMI
APO
P42
Pre-drive
Power
Amp.
Amp.
RL Short
Protector
Pre-drive
Power
Amp.
Amp.
Pop Noise
Ripple
Prevention
Filter
Circuit
Pre-drive
Power
Amp.
Amp.
RL Short
Protector
Pre-drive
Power
Amp.
Amp.
10
11
13
MUTE
VCC2
ADJ
LD0 ~ LD7
IC17
P40
P41
DVDD
KO Signal Generator
LSI17
UPD65611GB-019-3BA
-RESET
VDD
Working Storage RAM
LSI15
TC55257DFL-70L
— 12 —
19
Boot11
20
OUT11
21
PoGND1
22
OUT12
23
Boot12
1
VCC1
18
Boot21
17
OUT21
15
PoGND2
14
OUT22
12
Boot22
CPU
LSI14
HD6433294A19F
DVDD
DSP
LSI11
HG51B155FD-1
DVDD
Key Controller
LSI16
HG52E35P
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