Page 248 - Foton Workshop Manual - Auman EST-M

DI - 194 Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts

Failure phenomenon list

Use the list below to help you find the reasons of failures. The number represents the order of failure reason
possibility. Check each part according to the order and replace it when necessary.
Failure phenomenon Possible reason Failure elimination

1. Radio machine fuse (fused) Replace the same spec fuse
2. Radio power supply, ground circuit
Press down the power switch but the Repair or replace relevant harness
(open circuit or short circuit)
radio cassette player does not work
Repair or replace the radio cassette
3. Radio cassette player (broken)
player
1. The radio is muted Reset
2. Speaker circuit (open or shorted) Repair or replace harness
Can not hear any sound from the speaker
Repair or replace the radio cassette
(the sound is muted) 3. Radio cassette player (broken)
player
4. Speaker (broken) Repair or replace the speaker
1. Speaker harness or connector (open or
Repair or replace harness
short)
One of the speakers has no sound Repair or replace the radio cassette
2. Radio cassette player (broken)
player
3. Speaker (broken) Repair or replace the speaker
1. Multi-function combination switch to
the radio harness (open circuit or short Repair or replace harness
The multi-functional combination switch circuit)
cannot regulate the volume of radio 2. Steering wheel volume switch Repair or replace the steering wheel
cassette player (damaged) volume switch
Repair or replace the radio cassette
3. Radio cassette player (broken)
player
1. Disturbed by external high
electromagnetic waves or transmit signal Move to a place with good signal
distortion
Abnormal noise appears
2. Telescopic antenna (deformed or
Repair or replace the telescopic antenna
damaged)
3. Speaker (aging or failure) Repair or replace the speaker

1. Disturbed by the external

same-frequency electromagnetic wave
Not receiving AM/FM broadcast signal 2. Telescopic antenna (deformed or
Repair or replace the telescopic antenna
or poor reception damaged)
Repair or replace the radio cassette
3. Radio cassette player (broken)
player
1. Backlight lighting circuit Repair or replace harness
No lighting for the radio cassette player
Repair or replace the radio cassette
at night 2. Radio cassette player (broken)
player

DI-194