Bose CD-20 Service Manual page 27

15. CD Tracking Ability
15.1 The test discs listed in the chart below
should be played with no audible defects.
15.2 If the unit fails any of these tests,
replace the CD mechanism assembly or
proceed to the Alignment procedures.
Disc
ABEX test disc TCD-725A
ABEX test disc TCD-725A
ABEX test disc TCD-725A
ABEX test disc TCD-732R
ABEX test disc TCD-713R
TEST PROCEDURES
Test
Defect tracking (void), 1.0 mm
Defect tracking (black dot), .8 mm
Defect tracking (finger print), 65 µm
Defect tracking (warped disc), -1.0 mm
Defect tracking (eccentric disc), 210 µm
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Test Conditions
Track 6, 6 sec.
Track 9, 8 sec.
Track 13, 10 sec.
First and last track, 6 sec.
First and last track, 6 sec.