Table of Contents
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Product
CEM2101
G
Model
failure
NO.
phenomena
a. To check whether it is connect well of the ISO connector (4PIN power input ). Whether it is loose of the 15A
fuse of the ISO connector, or insert non in place.
b. To check whether the reset button Sw201 is long term functional then caused short circuit and no power.
c. To check whether there is any contamination and bad contact on the 22 Pin male/female connector on the
panel and main board.
d. To check the power supply of main board B+ ACC should be +12V; The voltage of stabilivolt of ACC power
1
NO Power
supply wire ZD210 (6V8) should be 6V8.
e. To check the voltage of the 19 pin (AVDD) of MCU (T5CL8) should be +3V3; The output voltage of IC307
(LM2950) should be +3V3.
f. To check the oscillation frequence of crystal X201 , shuold be 8MHz, and for the crystal X202 should be
32.768KHZ.
g. To check Panel LED +5V voltage , should be normal.
a. To check whether the volume knob is turn to the minimum position.
b. To check whether the unit is at MUTE mode, press SOURCE button and check whether it is effective of the
input sound source.
c. To check whether the connection of 8PIN audio output wire of ISO connector is correct; wrong connection or
short circuit to the ground will caused the protection of the power amplifier( no voltage output).
2
NO audio
d . To check the circuit of power amplifier IC501 (TDA7388) and VOL IC403 (7313IC).
output
e. To check the normal voltage of 22 PIN(MUTE) of power amplifier IC501(TDA7388) , normally should be 4V.
f. To check the voltage of control PIN SDA SCL the 27 28pin of audio processor IC403
should be +3V3.
a. To check the antenna of the tuner.
b. To check whether the strength of then input signal of the tuner is too weak.
c. To check the voltage of the 7 pin(VDD) of the tuner , should be +3V3.
d. To check the voltage of the 10 pin(RES) of the tuner, should be +3V6; the 11 pin(CLK) should be +3V1; the 12
3
pin(date) should be +2V8.
e. To check the oscillation frequence of crystal XT001 of the tuner, should be 32.768KHZ.
f. To check the L output voltage of the 5 pin of tuner should be 1V5, the 6 pin R output voltage , should be 1V5.
Area
failure cause
19
Date
2012-6-20
remark
7313 IC
,
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