Lexus SC300 / Lexus SC400. Manual — part 159
18
Tape player
SOUND QUALITY POOR
A. without CD player type
Is radio operating normally?
Is speaker properly installed?
Temporarily install another speaker.
Functions OK?
Radio receiver assembly faulty.
Operates normally after cleaning the heads?
Head dirty.
Radio receiver
assembly faulty.
Speaker installation faulty.
Speaker faulty.
B. with CD player type
Is speaker properly installed?
Temporarily install another speaker.
Functions OK?
Radio receiver assembly faulty.
Speaker installation faulty.
Speaker faulty.
Power amplifier faulty.
Head dirty.
Radio receiver as-
sembly faulty.
Temporarily install another power amplifier.
Functions OK?
Is radio operating normally?
Operates normally after cleaning the heads?
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–247
19
Tape player
VOLUME REMAINS AT MAXIMUM LEVEL
A. without CD player type
Is radio operating normally?
Radio receiver assembly faulty.
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
Radio receiver assembly B1 – Power switch 14
Radio receiver assembly B3 – Power switch 11
Power switch faulty.
Radio receiver assembly faulty.
When the volume switch is turned from minu-
mum to maximum, does resistance between
terminal 11–14 of power switch change from 0
to 50 k
?
B. with CD player type
Is radio operating normally?
Radio receiver assembly faulty.
Wire harness faulty.
Is there continuity between the following terminals
with connector disconnected?
Radio receiver assembly B1 – Power switch 14
Radio receiver assembly B3 – Power switch 11
Power switch faulty.
Radio receiver assembly faulty.
When the volume switch is turned from minumum
to maximum, does resistance between terminal
11–14 of power switch change from 0 to 50 k
?
BE–248
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
20
CD player
MAGAZINE CANNOT BE INSERTED INTO AUTO
CHANGER
Is radio operating normally?
Is there battery voltage between the following termi-
nals with connector connected?
Radio receiver assembly C5 – ground
Is there continuity between the following terminals
with connector disconnected?
CD auto changer A4 – Radio receiver assembly C5
Is there continuity between the following terminals
with connector disconnected?
CD auto changer A9 – ground
CD auto changer faulty.
Wire harness faulty.
Radio receiver assembly faulty.
Go to No. 1.
Is there continuity between the following terminals
with connector disconnected?
CD autochanger A9 – Radio receiver assembly C4
Wire harness faulty.
Radio receiver as-
sembly faulty.
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
BE–249
21
CD player
MAGAZINE IS INSERTED, BUT DISPLAY DOES
NOT INDICATE ”CD”
Is radio operating normally?
Is there battery voltage between the following
terminals with connector connected?
Radio receiver assembly C12 – ground
Wire harness faulty.
Radio receiver assembly faulty.
Go to No. 1.
Is there battery voltage between the following
terminals with connector connected?
Radio receiver assembly C12 – CD auto
changer A3
Is there battery voltage between the following
terminals with connector connected?
Radio receiver assembly C3 – CD auto changer
B1
Radio receiver assembly C8 – CD auto changer
B3
Radio receiver assembly C9 – CD auto changer
B2
Radio receiver assembly C10 – CD auto changer
B10
Is there battery voltage between the following
terminals with connector disconnected?
Radio receiver assembly C3 – ground
Radio receiver assembly C8 – ground
Radio receiver assembly C9 – ground
Radio receiver assembly C10 – ground
Temporarily install another CD auto changer.
Functions OK?
CD auto changer faulty.
Wire harness faulty.
Wire harness faulty.
Radio receiver assembly faulty
BE–250
–
BODY ELECTRICAL SYSTEM
AUDIO SYSTEM
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