Can Not Receive Radiobroadcast (Poor Reception); Touching Panel Switch Does Not Work - Lifan 620 Maintenance Manual

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(4) Check the installation of CD player assembly
If it is normal, fault of CD disk exists; if not, proceed to the next step.
(5) Check CD player assembly
① Check the voltage between audio system assembly connector terminal A7 and vehicle body,
the voltage shall be 10~14V.
Check the resistance between audio system assembly connector terminal A8 and vehicle body,
②
the resistance shall be less than 1Ω.
Turn ignition switch to ACC, check the vo ltage between audio system assembly connector
③
terminal A4 and vehicle body, the voltage shall be 10~14V.
If it is normal, repair or replace CD player assembly; if not, repair or replace wiring or connector.
6. Poor tonal quality only when playing CD (volume is too low)
Check the installation of CD player assembly. If it is normal, fault of CD disk exists; if not, check
and repair CD player assembly.

7. Can not receive radiobroadcast (poor reception)

Check according to the circuit diagram Fig. 4-108, detailed steps as follows:
(1) Check whether radio automatic search works normally.
If it works normally, repair or replace CD player assembly; if not, proceed to the next step.
(2) Check whether any jamming equipment is working (e.g. wiper, air conditioner blower, glass
frame riser).
If any jamming equipment is working, the influence is from the jamming equipment; if not, proceed
to the next step.
(3) Make noise check for printed antenna.
Turn ignition switch to ACC, start radio and select AM mode, check whether the speaker noise is
caused by putting screwdriver on the antenna. If it is normal, repair or replace CD player assembly;
if not, proceed to the next step.
(4) Check audio system antenna assembly.
Disassemble the aerial plug of audio system assembly, after connect radio connector, turn ignition
switch to ACC, start radio and select AM mode. Check whether speaker noise is caused by putting
metal matters like fine flat blade screwdriver or tenuous wire on the antenna base of radio
assembly. If it is normal, proceed to the next step; if not, repair or replace CD player assembly.

8. Touching panel switch does not work

Check according to the circuit diagram Fig. 4-108, detailed steps as follows:
(1) Check touching panel for stains; if stains exist, clean the surface stains; if not, proceed to the
next step.
(2) Check whether touch switch works well. If it works well, proceed to the next step; if not repair or
replace CD player assembly.
(3) Check multimedia player assembly.
① Test the voltage between audio system assembly connector terminal A7 and vehicle body, the
voltage shall be 10~14V.
② Test the voltage between audio system assembly connector terminal A8 and vehicle body, the
voltage shall be less than 1Ω.
③ Turn ignition switch to ACC, test the voltage between audio system assembly connector
terminal A4 and vehicle body, the voltage shall be 10~14V. If it is normal, proceed to the next step;
if not, repair or replace wiring and connector.
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