1994 MAZDA MX-5 Workshop Manual

T AUDIO Step 5 1. Check for proper tightness of the antenna mounting nut. 2. If the nut is loose, tighten it. 3. If the nut is tight, go to Step 6. u Step 6 1. Remove the audio unit. (Refer to page T-145.) 2. Check for proper connection of the antenna connector. 3. If necessary, repair or reconnect it. 4. If the connection if OK, replace the audio unit.. Gartner Banana

AUDIO T 1 Symptom: Poor sound quality (Cassette tape player) I u Possible cause Damaged cassette tape Damaged speaker Damaged audio unit Dirty heads and pinchroller 45UOTX-250 Step 1 1. Play a known good tape, and check the sound quality. 2. If sound quality is normal, the previous tape is defective. The system is OK. 3. If sound quality is still poor, go to Step 2. Step 2 1. Check for oxide or dirt on the head, capstan, and pinch- roller. 2. If oxide or dirt is found, clean the parts by using a head cleaner (commercially available). 3. If there is no oxide or dirt, go to Step 3. Step 3 1. Check for damage to the speakers. 2. Check for proper connection of the speaker connectors. 3. Disconnect all speaker connectors, and measure resis- tance of each speaker. Resistance: 4Q 4. If a speaker has incorrect resistance or is damaged, re- place it. 5. If the speakers are OK, go to Step 4. Step 4 1. Compare sound quality with that of another vehicle that has the same type of audio system. 2. If the sound quality is inferior to the other unit, replace the audio unit. Gartner Banana

T AUDIO Symptom: Cassette tape will not load Possible cause Damaged cassette tape Damaged audio unit Step 1 1. Check if a known good cassette tape will load. 2. If the tape loads, the previous tape is defective. The sys- tem is OK. 3. If the tape will not load, go to Step 2. I I 9MUOTX-384 s=Jh Step 2 1. Check if radio operation is OK. 2. If radio operation is OK, replace the audio unit. 3. If the radio do not operate, there is a defect in the power supply circuit. Gartner Banana

AUDIO Symptom: Cassette tape will not play i/ Possible cause Damaged cassette tape Damaged audio unit 45UOTX-252 Step 1 1. Check if cassette tape will load. 2. If cassette tape will not load, see "Cassette tape will load." (Refer to page T-134.) 3. If cassette tape loads, go to Step 2. not Step 2 1. Play a known good tape, and check the sound quality. 2. If the sound quality is normal, the previous tape is defec- tive. The system is OK. 3. If the sound quality is still poor, go to Step 3. Step 3 1. Check for oxide or dirt on the head, capstan, and pinch- roller. 2. If oxide or dirt is found, clean the parts by using a head cleaner (commercially available). 3. If after cleaning the parts, the tape still does not play, re- fer to "Speaker(s) do not operate" (Refer to page T-125, 127) or "No sound can be heard." (Refer to page T-137.) Gartner Banana

T AUDIO Symptom: Compact disc will not load Possible cause Damaged compact disc Ll' Damaged CD player Note The CD player automatically ejects dirty or damaged discs. Step 1 1. Check if a known good compact disc will load. 2. If the compact disc will load, the system is OK. 3. If the compact disc will not load, go to Step 2. Step 2 1. Check if the radio operates normally. 2. If the radio operates normally, replace the audio unit. 3. If the radio does not operate there is defective in the power supply circuit. I I 35UOTX-074 Symptom: Compact disc skips Possible cause Damaged compact disc Damaged CD player Remedy 1. Check with the driver if skipping occurs often. 2. If it occurs often, check that the audio unit is properly installed. (1) If the audio unit is not installed properly, remedy it. (2) If the audio unit is installed properly, replace the audio unit. Gartner Banana

AUDIO I Symptom: No sound can be heard I Possible cause Burnt CIGAR fuse Burnt ROOM fuse Damaged audio unit ROOM 1 OA 35UOTX-077 Open circuit in wiring harness Poor connection of connector Damaged DIN cord Step 1 Check the CIGAR 15A fuse and ROOM 1 OA fuse in the fuse block. I Fuse 1 Action I Step 2 1. Remove the audio unit. (Refer to page T-145.) 2. Check the connectors and the DIN cord of the audio unit. 3. If a connection is poor or loose, repair or replace it. 4. If the connectors are OK, go to Step 3. Burnt OK Step 3 1. Turn the ignition switch to ACC position. 2. Measure voltage at terminals A (UB) and C (UR) of the AM-FM radio unit connector (1 2-pin). Replace fuse after checking and repairing wiring harness Go to Step 2 B+: Battery positive voltage Terminal 1 Voltfe Action Measure terminal C (VR) voltage Repair wiring harness (CIGAR fuse - AMeFM radio unit) Go to Step 4 Repair wiring harness (ROOM fuse - AM-FM radio unit) 1 Step 4 1. Check for continuity between body of the AM-FM radio unit and ground. I No Repair wiring harness (AM-FM radio unit - GND) 1 Continuity Yes Action Replace audio unit Gartner Banana

T AUDIO Symptom: Some speakers do not operate 1 Possible cause Damaged speaker Damaged audio unit Damaged DIN cord Open or short circuit in wiring harness Poor connection of connector Open or short circuit in DIN cord 45UOTX-260 Step 1 1. Turn the ignition switch to ACC. 2. Turn the audio system power to ON. Play a recorded tape and set the volume at an appropriate level. 3. Verify speaker operation with the balance, treble, bass, and fader knobs in the positions indicated in Table 1. 4. If not as specified in Table 1, refer to Table 2 and continue troubleshooting at the step corresponding to the faulty speaker. 35UOTX-082 Table 1 1 Speaker Balance I Treble I Left door (woofer) I Right I ( Right door (woofer) I I Left door (tweeter) I Right I Right door (tweeter) Right Driver-side left headrest Right . I Passenger-side left headrest I Right I Driver-side right headrest Left Bass Passenger-side right headrest Right Left Fader I Speaker operates I Yes Right 1-1 I No Yes I Left Yes Table 2 Gartner Banana

AUDIO T Step 2 1. Remove the door speaker (woofer). (Refer to page T-146.) 2. Make sure the speaker is properly connected. 3, If the connections are OK, go to Step 3. 4. If a connection is poor, repair it. Step 3 1. Disconnect the connector from the suspected faulty door speaker. 2. Measure the resistance between the terminals of the door speaker (woofer). Step 4 1. Remove the audio unit. (Refer to page T-145.) 2. Make sure the audio unit connectors are properly con- Resistance 4Q Other nected. 3. If the connections are OK. ao to Step 5. Action Go to Step 4 Replace speaker 4. If a connection is poor, rep& it. 1. 6heck for continuity between the AM-FM radio unit con- nector (1 2-pin) and the door speaker (woofer) connec- tor (2-pin). Radio r 'Laker I connector I connector Right door 2. If correct, replace the AM-FM radio unit. 3. If not as specified, repair the wiring. Left door ~ ~ I M ((VV 12-pin tr B (WG) 2-pin N (L) 12-pin +t A (RMI) 2-pin Yes Yes K (RIG) 12-pin tr B (RIG) 2-pin L (WW) 12-pin o A (RNV) 2-pin Yes Yes Gartner Banana