Fuse (Poly Switch) Check - Pioneer MVH-X580BS Service Manual

1

5.4 FUSE (POLY SWITCH) CHECK

-
No sounds and display output of external unit (the condition when the fuse is blown (poly switch is working))
A
This product may receive excessive current if the power line connection of the external product is incorrect, such as Ground
connection failure.
The poly switch P1243 on TUNER AMP UNIT is used to protect this product from this excessive current.
Even though poly switch is working to cut the circuit, the sounds of Pre-out output and AUX input are output properly and also
other functions work correctly.
However, you cannot turn on the external product connected to this product as the power is not supplied if the poly switch is
working to cut the circuit.
(The symptom in this case is the sounds of external product are not output on this product when the external product is
connected on a vehicle.)
If you find the symptoms above, check whether or not the poly switch is working to cut the circuit.
If there is any problem (you cannot turn on the power of external unit), check the power connection (Ground) of external unit.
B
C
D
E
F
14
1
2
*R1241
*R1242
*R1243
*R1244
*R1245
*R1246
MVH-X580BS/XNUC
2
3
L1292
VTL1126-A
L1293
GND A
VTL1126-A
R1256
L1294
3P/O
NM
R1253
VTL1126-A
0 R1254
NM
2P/O
L1295
VTL1126-A
L1296
VTL1126-A
L1297
VTL1126-A
3
4
JA1241
CKB1113
3P/O
1 RR
R1255
2 RL
0 3 SWR
4 SWL
3P/O
5 FR
6 FL
7 GND
8 GND
GND
GND
4