JVC MX-G50 Service Manual

MX-G50/MX-G56
1-27
Troubleshooting
1. Amplifier
Power malfunction
No output
Front PCB -com
VDD(5V) normal?
UIC1 pin no.18, 46,90
Main PCB RIC(L4959)
pin no.2, 10 input
voltage normal?
Front PCB PWR-SENS
voltage normal?
(pin no.94;5V)
-Check the main PCB
RIC1(L4959)
-Check the front PCB
UD13(L4959)
-Check the main PCB;
RBD1(PBL403) RD8(IN5392)
-Check the power PCB;
Fuse P/T, RFS2, RFS5, RFS6
-Check the main PCB;
RR7, RC7, RZD4, RR6
RR5, RR4, RC8, RD3
Check the B+, B- power source
RBD1, RBD2, RW2
Check the power PCB
Fuse, P/T, RFS2, RFS5,
RFS6, RFS7, RFS8
Front PCB
Does UX1(6MHz)
oscillate?
Check the main PCB
RIC1(L4959)
Check the AMP PCB
AIC1, AIC2
Check headphone jack
soldering condition
Check the front PCB
UIC( -com), UIC2(M66010gp)
Check the AMP PCB
AQ2L, 2R, AQ1,2,3,4
Remove it with remocon
Is mute selected?
Headphone jack short?
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Replace -com
Replace UIC2(M66010)
Front PCB
When the power is
ON 'H' display at pin
no.15(UIC2)
AQ 2L, 2R, AQ 1,2,3,4
Emitter B+?
AMP PCB AIC1, AIC2
pin no. 4,8,9,12
B+,B- normal?
UIC1( -com)pin79
check the "H"?

JVC MX-G50 Specifications

General

Brand	JVC
Model	MX-G50
Category	Speaker System
Language	English