1.  AM and FM station can’t manual select

AM and FM station can’t manual select

                            

	  	

Check EN101

Check 3P wire CW102  and CN102 tightly                 connect

NG

No

OK

Firmly connect CW102 and CN102 wire

Yes

Exchange Tuning PWB ass’y(4-0DC012-U-PATUN)

Exchange control PWB ass’y(4-0DC012-U-PALCD)

Properly connect CW101 2P wire

Yes

No

Exchange   new button battery

(C) check button battery capacity

(B) check button battery contact
battery spring

(A) check button battery installed       properly 

OK

NG

Yes

No

Yes

No

Yes

Check clock display on AC/DC power

Check CW101 2P wire tightly connect

See unit can’t display and no sound troubleshooting guide(item 6)

Display is OK on AC/DC
power , and clock run correctly.

Clock no run on button battery

No

Yes

      2. Clock no run on button battery(CR2032)

Properly installed button battery in order to completely contact battery spring or exchange back battery PWB ass’y

Properly installed button. battery

Exchange back battery PWB ass’y (4-0DC012-U-PABATT / 5140072-03 or 5140113-35 depending on D/C)

Unit can’t receive FM station

Check unit can receive AM  station

Yes

3. Unit can’t receive FM station

No

FM antenna broke

FM ant wire broken and open circuit

No

Yes

Yes

No

Exchange FM ant ass’y (4-0DC012-U-PAANT)

Exchange MAIN PCB ass’y (4-0DC012-U-PAMAIN)

Exchange FM ant plate ass’y (4-0DC012-U-ANTPLAT)

4. Unit can’t receive AM station

AM magnetic bar broken

No

Yes

No

Check Unit can receive FM station

Unit can’t receive AM station

Yes

AM coil and magnetic bar loose

Add wax to mount AM coil

Exchange MAIN PCB ass’y (4-0DC012-U-PAMAIN)

NG

Exchange AUX INPUT PCB ass’y (4-0DC012-U-PAAUX)

Tightly insert aux   connection wire and mounted JACK301

See unit can’t display and no sound troubleshooting guide (item 6)

Aux connection wire tightly insert and JACK301 is completely mounted

Yes

No

AUX function no sound

OK

OK

NG

Yes

NO

Check sound source unit normally work

NG

OK

Confirm AM/FM function speaker sound

5 AUX function no sound

Change to new sound source or mend sound source

Check AUX PWB wire CW302 to CN301 connect

Properly connect CW302 to CN301

Exchange Main PCB ass’y (4-0DC012-U-PAMAIN)

6. AC Input, Unit can’t display and no sound

Confirm unit no display and no sound  on AC power, but DC MODE is OK

AC Input Unit can’t display and no sound

                         

NG

OK

See “Battery pack input, unit can’t display and no sound”

Check transformer and CN604 properly connect

NG

OK

Exchange the transformer ass’y (4-0DC012-U-TRANSFM)

Exchange the power PWB ass’y (4-0DC012-U-PAPW)

7. Battery pack input, unit can’t display and no sound 

Exchange the volume PWB ass’y (4-0DC012-U-PAVOL)

Battery pack input unit can’t  display and no sound

Confirm unit no display and no sound on battery pack, but AC mode is OK

Yes

No

Check BATT wire CW609 to CN609 properly connect, the CN609 batt voltage value is more than 10V. 

Check speaker wire properly connect.

Check all connector (CN508,CN505,CN503,CN201)  properly connect

Yes

No

Yes

No

Yes

No

Properly connect all wire

Properly connect speaker wire.

Exchange the power PWB ass’y (4-0DC012-U-PAPW)

Exchange the charge PWB ass’y (4-0DC012-U-PACHAR)

Check VR301

OK

NG

Check IC501 pin1 power supply voltage >9V

NO

Yes

Exchange control PWB ass’y (4-0DC012-U-PALCD)

Exchange main PWB ass’y (4-0DC012-U-PAMAIN) if CN508 pin2 output voltage value > 9.8V

Exchange power PWB ass’y (4-0DC012-U-PAPW) if CN508 pin2 output voltage value < 9.8V

8. Unit can’t charge and charging indicator fast blink

Unit can’t charge and charging indicator fast blink

Confirm FM/AM/AUX function OK, only charging function is NG

NG

Yes

     

Fast blink(charge Li battery)

Fast blink(charge Ni-Cd battery)

Charge LED off

Exchange charge PWB ass’y (4-0DC012-U-PACHAR)

Exchange new charger

Exchange power PWB ass’y (4-0DC012-U-PAPW)

Confirm relay REL601,REL602 and REL603

Screw up the hall sense pwb.

Yes

No

 Hall sense pwb loose

Yes

Confirm battery pack is too heat to charge

Exchange LED PWB ass’y (4-0DC012-U-PALED)

Yes

No

Check LED wire CW603 	to CN603 properly connect.

No

Confirm battery contact is OK and contact is good when inserted battery pack

NG

Charge after battery
Pack temperature is low

OK

OK

NG

OK

No

Adjust voltage to approach standard value

Yes

NO

Confirm AC voltage is too
High or too low

NG

OK

Confirm AM/FM/AUX function 

9.  AC SOCKET output no function.

AC SOCKET output no function

AC PLUG tightly insert AC SOCKET and all wire properly connect.

See AC input, unit can’t display and no sound troubleshooting guide (item 6)

Yes

No

Exchange AC CORD ass’y (4-0DC012-U-ACCORD) 
or exchange AC OUTLET ass’y (4-0DC012-U-PAOUT)

Tightly insert and all connector properly contact.

NG

Exchange AUX INPUT PCB ass’y (4-0DC012-U-PAAUX)

Tightly insert aux   connection wire and mounted JACK301

Yes

No

OK

OK

NG

Yes

NO