Philips CED1900/55 Service Manual page 23

b To check whether the strength of then input signal of the tuner is too weak.
4 Radio
abnormal c To check the voltage of the 13 pin of the U8 of the tuner IC, should be +3V3.
d.To check the oscillation frequence of crystal X3 of the tuner IC,shuold be 32.768MHz.
a. To check whether the signal format of the disc is correspond to the request of the unit, whether there is any contamination or damage
or light leakage on the surface of the disc.
b. To check whether there is any abnormal of the rotation of the deck mechanism, or whether the disc is enter in position.
c.To check whether it is normal when reading USB?
d.To check whether the CN2 24P FFC of laser pick up is inserted in place, whether the socket of it is loose.
CD/DVD
5
defective e.To check whether there is any contamination or foreign body on the surface of the laser pick up.
f.To check the servo board connector of CN5 and the main board connector of CN1, whether the socket of it is loose.
g.To check the voltage of the 27 pin ~ 30 pin of the CN1 , should be +5V0.
h.To check the switch SW1 on the servo board.
I.To check the rotation mechanism of CD/DVD deck.
a To check whether the USB/SD signal format is correspond to the request of the unit.
b To check the voltage of the the uppermost pin of the USB connector, should be +5V.
USB
6
defective
c To check whether there is any wearing and scratch of the shrapnel and pin of the panel USB.
e To check the servo board connector of CN5 and the main board connector of CN1, whether the socket of it is loose.
a Enter MENU, Check has selected the front AUX-1 or rear AUX-2.
AUX
7
defective
b To check the AUX IN input signal.
a To check the micro SD memorizer of the map of the GPS.
GPS
8 b To check the GPS antenna of the tail of the unit .
defective
c To check the connector of the CON7 whether the socket of it is loose.
23