Section 5 Troubleshooting; Power Sequence - JVC KD-R491 Schematic Diagrams

5.1

Power sequence

: IC701 Micon control
Dotted Line: Standby Circuit
+B
14V
10A
14V
14V
14V VCC2
BU_
DET
R900~R903
ACC
ACC_DET
14V VCC1
350mA
300mA
1300mA
250mA
IC901
SYSREG
450mA
350mA
Freq_Sel
3A
5.2V
14V IC861
DCDC
SECTION 5
TROUBLESHOOTING
IC301
Power Amp
Sxi
Marine Remote
Flag (ON=3.3V, OFF=0V)
uCON (Pin99)
SDA/SCL
uCON (Pin95,Pin96)
SDA/SCL
DC CORD
EXT 350mA
(Auto Ant & REMOTE)
SDA/SCL
(Panel attach)
LED
ILM10.5V 184mA
LCD Driver
SDA/SCL
(CD Insert)
950mA
CD7V
CD Mecha
SDA/SCL
AUD (8.5V) 35mA
IC161 Evol
Muting circuit Q270 & Q27
Tel-mute pull up
SDA/SCL
IC411
408mA
TU3.3V
IC601 Tuner
uCON SW3.3V
61mA
VDD 141mA
uCON VDD
Panel3.3V
Always ON
Mute Circuit Q272 & Q27
IC482 Marine circuit
IC822
VDD
IC831
1.25V 80mA
uCON 1.25V
IC851
PON_USB
2388mA
IC891 5.2V 1800mA
Front USB
HSS
PON_CD
CD LSI
180mA
IC941
CD Pickup
LDO
408mA IC901 Pin13 (Supply for TU3.3V)
(No.MA665<Rev.001>)28/33
max typ
Main 300mA 150mA *No Signal
External 500mA 90mA *typ Measured value
SWITCH PWB
Main 350mA
Type E
Panel 184mA 10.5V
0.33
CD Mecha 950mA
Main 35mA
Main
Main
Main 7.5mA
Main 200mA
Main 200mA
Main 3.3V
1mA
Panel 2mA
Main
Main
Main 50mA
Main 8mA
80mA
1800mA
CD Mecha 70mA
CD Mecha 110mA
408mA
LED
IC3
Shunt
regulator
ON =6.2V
IC1
OFF=3.2V LCD Driver
IC90 Remote 0.6mA