TSRM/MK4 Supra/Repair Manual
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BE/Body Electrical Systems — Sound Quality Poor (Volume Faint), page 100

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p.101
Sound Quality Poor (Volume Faint) — MK4 Supra Body Electrical Systems, page 100
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Page text (OCR transcript)
BE–100
BODY ELECTRICAL SYSTEM – AUDIO SYSTEM

14  Tape Player  SOUND QUALITY POOR (VOLUME FAINT)

W  : w/ Power Amplifier
WO : w/o Power Amplifier

Function OK if different cassette
tape installed?
Yes → Cassette tape faulty?
No
↓
Operates normally after cleaning the heads?
(See MAINTENANCE OF TAPE PLAYER)
Yes → Head dirty.
No
↓
Is radio operating normally?
Yes → Radio assembly faulty.
No
↓
Is speaker properly installed?
No → Install properly.
Yes
↓
Temporarily install another speaker.
Functions OK?
Yes → Speaker faulty.
No
↓
WO  Radio assembly faulty.
W   Radio assembly or power amplifier faulty.

15  Tape Player  TAPE JAMMED, MALFUNCTION WITH TAPE SPEED
OR AUTO REVERSE

W  : w/ Power Amplifier
WO : w/o Power Amplifier

I Functions OK is different tape (less
t than 120 mins.) is installed?
Yes → Cassette tape faulty.
No
↓
is there a foreign object inside tape player?
Yes → Remove foreign object.
No
↓
Operates normally after cleaning the heads?
(See MAINTENANCE OF TAPE PLAYER)
Yes → Head faulty.
No
↓
Radio assembly faulty.