281 

 

No. 205 USB interface of CD –player malfunction (U-disk) (MK)   

Malfunction Cause 

Solution 

N

①

o music stores in U-disk 

Copy MP3 music to U

①

-disk 

No MP3 music stores in U

②

-disk 

Check music format on PC, whether it stores MP3 files.

②

Improper operation

③

 

Static or pulse voltage, appears when insert U

③

-disk 

repeatedly, results CPU error. (Don't pull out U-disk 
when playing music. It must turn to other MODE first.) 
Press RST button by sticker to reset CD-player and 
remove malfunction. 

U

④

-disk broken 

Check U

④

-disk by applying another normal U-disk. 

U 

⑤

–disk improper inserted 

Insert U

⑤

-disk until the indicator lightened. (The flat 

surface of U-disk shall be upwards, and the groove 
surface shall be downwards.) 

⑥

Dirt on U-disk interface conducting 

point 

Clean with special clean solution (Note: may clean 

⑥
with soft cloth, never use solvent such as benzene or 
alcohol.) 

CD 

⑦

–player interface contacting point 

deformed 

Replace CD

⑦

-player assembly 

Data loss

⑧

 

U

⑧

-disk malfunction results data loss and affects music 

play, inspect with another normal U-disk on same 
CD-player. Replace U-disk when necessary. 

USB interface of CD 

–player malfunction 

(U-disk) 

CD

⑨

-player inner program 

malfunction, which affects USB loading

Replace CD

⑨

-player assembly, including USB 

 

 
 

 

 

282 

 

Copy MP3 music to U-disk 

Copy MP3 music to U-disk 

Press RST button by sticker to reset CD-player and remove 

failure. 

No music stores in U-disk 

USB interface of CD –player 

failure (U-disk) 

No MP3 music stores in U-disk 

Improper operation 

U-disk broken 

U –disk improper inserted 

CD –player interface conducting 

point deformed 

Dirts on U-disk interface 

conducting point 

Replace with U-disk of same specification 

Insert U-disk until the indicator lightened. 

Clean interface contacting point 

Replace CD-player assembly 

Data loss 

CD-player inner program failure, 
which affects USB loading 

Replace CD-player assembly, 

including USB 

Replace U-disk with same specification 

Normal 

Abnormal 

Normal 

Normal 

Normal 

Normal 

Normal 

Normal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Abnormal 

Normal 

Abnormal 

 
 

 

 

283 

 

No. 206 CD-player burns out when connecting power source   

Malfunction Cause 

Solution 

CD-player power source or 
circuit malfunction 

Check CD-player power source, whether the voltage is between 12V and 
14V. If the voltage is over normal standard, then check generator and 
external power source, whether they operating normally. 

Check the resistance value between the positive pole of CD-player power
supply circuit and CD-player housing, with multimeter, whether the value is
between 5kOhm and 10kOhm. If the circuit is conducting and the resistance
value is 0, then it indicates there is short circuit between positive pole of
power source and CD-player housing. 

CD-player short circuit 
between housing and earth 

Check CD-player inner stabilized voltage supply and all components of 
protective circuit, whether there is short circuit. The principle inspecting 
points are as follows: the inductive choke of stabilized voltage supply end, 
the dynatron of controlling switch power supply and protective diode. 
Check the components above, whether they were burnt out, and replace 
them or the CD-player when necessary. 

CD-player burns 

out when 

connecting 

power source 

CD –player over load 

Connect multimeter to positive pole of CD-player, and set to current 
measure mode. Turn on CD-player and operate in common condition, test 
current whether it is over normal value. Check power source circuit and 
corresponding loads one by one, whether they are over load or consist 
leakage. 

 

Check CD-player power supply voltage 

Inspect and maintain 

generator 

CD-player burns out when connecting power 

source

Check the resistance value between the 

positive pole of CD-player inner power 

source and CD-player housing. 

Inspect and maintain stabilitized 
power source circuit 

CD-player over load 

Replace CD-player assembly 

Inspect and maintain power 

amplifying circuit 

Normal 

Over load 

Abnormal 

Abnormal 

Normal 

Normal 

 
 

 

 

284 

 

No. 207 CD-player consists back drop   

Malfunction Cause 

Solution 

 Check disk surface, whether it consists scuffing or 

①
wearing seriously, which results fuzziness sound when 
playing. 

CD –player disk malfunction 

 Check whether there is problem of disk quality.

②

 

Engine high voltage wire or other electric 
appliances 

Check 

③

engine high voltage wire, whether it is 

damaged. As well as the resistance value, whether it is 
normal. Replace when necessary. 

 Check shield wire between CD

④

-player housing and 

earth lead, whether it consists disconnection or loose. 

CD-player shield wire malfunction 

⑤

Check the connection condition between radio 

antenna pin and CD-player housing. 

The alternation switch of CD-player and 
radio not in place. 

 Check the transfer switch between CD

⑦

-player and 

radio, whether it consists virtual link, or in place. 
Inspect the mechanical part of corresponding 
connection or replace CD-player assembly when 
necessary. 

Check the filter in CD

⑧

-player stabilized circuit. For 

the filters with inductive choke, shall inspect leakage. 
Replace CD-player when necessary. 

CD-player stabilized power source 

components and loudspeaker circuit 

components 

 Check the capacitor in circuit, whether it is damaged. 

⑨
Replace CD-player when necessary. 

CD-player consists 

back drop when 

operating 

CD –player inner malfunction 

 Check power source, if it is low power, which results 

⑾
CD-player inner components operate abnormally. 
Replace CD-player assembly when abnormal.