AUDIO SYSTEMS 9F – 3
DAEWOO V–121 BL4
DIAGNOSIS
STEREO CASSETTE AM/FM RADIO
Cassette AM/FM Radio Inoperative
Step Action Value(s) Yes No
1 Check fuses EF1, F9, and F10.
Are fuses EF1, F9, and F10 blown?
Go to Step 2 Go to Step 3
2
1. Check for a short circuit and repair if neces-
sary.
2. Replace the blown fuses.
Is the repair complete?
System OK
3
1. Use a voltmeter to test for battery voltage at
fuses EF1 and F10.
2. Turn the ignition ON and test for battery volt-
age at fuse F9.
Does the battery voltage match the specified value
at fuses EF1, F9, and F10?
11–14 v Go to Step 5 Go to Step 4
4 Repair the power supply circuit to the fuses.
Is the repair complete?
System OK
5
1. Disconnect the radio electrical connector.
2. Turn the ignition ON.
3. Use a voltmeter to test for battery voltage at
the radio connector terminals 4 and 5.
Does the battery voltage match the specified value
at both terminals?
11–14 v Go to Step 7 Go to Step 6
6 Repair the open circuit between the radio connector
and the fuse.
Is the repair complete?
System OK
7 Use an ohmmeter to test the ground circuit at the ra-
dio connector terminal 14.
Does the resistance match the specified value?
0–0.5 W Go to Step 9 Go to Step 8
8 Repair the open ground circuit between the radio
connector and ground G105.
Is the repair complete?
System OK
9 Replace the radio.
Is the repair complete?
System OK
Cassette Player Inoperative, AM/FM Functions OK
Step Action Value(s) Yes No
1 Verify the customer complaint.
Does the cassette player destroy tapes?
Go to Step 5 Go to Step 2
2 Using a good–quality tape, determine whether the
cassette player performs poorly or is inoperative.
Does the cassette player perform poorly?
Go to Step 5 Go to Step 3
3 Check the cassette player for obstructions behind
the tape door.
Is an obstruction found?
Go to Step 4 Go to Step 8
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