Pinpoint Tests
PINPOINT TEST A: THE AUDIO UNIT IS INOPERATIVE/DOES NOT
OPERATE CORRECTLY.
A1: CHECK THE OPERATION OF THE AUDIO UNIT............................ 415-00-3B
A2: CHECK FOR SOUND FROM THE SPEAKERS................................ 415-00-3B
A3: CHECK BATTERY SUPPLY FUSE................................................... 415-00-3B
A4: CHECK THE ACCESSORY SUPPLY FUSE..................................... 415-00-4
A5: CHECK CIRCUIT 29-MD15/74-MD15 AUDIO UNIT SUPPLY ........... 415-00-4
A6: CHECK CIRCUIT 91-MD15 AUDIO CONTROL UNIT GROUND....... 415-00-4
A7: CHECK CIRCUIT 29 MD15/74-MD15 FOR CONTINUITY ................ 415-00-5
A8: CHECK CIRCUIT 29-MD15/74-MD15 FOR SHORT.......................... 415-00-5
A9: CHECK THE RADIO RECEIVER, CASSETTE PLAYER FOR
CORRECT OPERATION ........................................................................ 415-00-5/6
PINPOINT TEST B: POOR RECEPTION
B1: CHECK THE ANTENNA RECEPTION.............................................. 415-00-6
B2: CHECK THE ANTENNA GROUND................................................... 415-00-6/7
B3: CHECK THE ANTENNA CORE RESISTANCE................................. 415-00-7
B4: CHECK THE ANTENNA BASE CONNECTOR RESISTANCE.......... 415-00-7
B5: CHECK THE ANTENNA CORE FOR SHORT .................................. 415-00-8
B6: CHECK THE ANTENNA CABLE FOR SHORT ................................ 415-00-8
PINPOINT TEST C: DISTORTED SOUND FROM ONE OR
MORE SPEAKERS
C1: CHECK THE AUDIO CONTROL OF THE SPEAKER (S) ................ 415-00-8/9
C2: CHECK THE SPEAKER CIRCUIT RESISTANCE............................. 415-00-9
C3: CHECK THE RESISTANCE OF THE SPEAKER.............................. 415-00-9/10
C4: CHECK THE SPEAKER CIRCUIT CONTINUITY.............................. 415-00-10
PINPOINT TEST D: NO SOUND FROM ALL OF THE SPEAKERS
D1: CHECK THE ELECTRICAL CONNECTORS TO THE AUDIO UNIT . 415-00-11
D2: CHECK THE SPEAK OSITIVE CIRCUIT FOR
SHORT TO GROUND............................................................................. 415-00-11
D3: CHECK THE SPEAKER NEGATIVE CIRCUIT FOR
SHORT TO GROUND............................................................................. 415-00-12
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