Cd Test Procedures - Bose Life CD5 Series I Service Manual

CD ALIGNMENT PROCEDURES
(WITH FIXTURE)
Note: Some of these procedures require
the use of a CD alignment fixture (P/N
176318). Alternate procedures that do not
require a fixture begin on page 30. Refer to
Figure 11, CD Alignment Fixture Test
Setup. The fixture is required unless other-
wise specified. Refer to Figure 13 for
adjustment locations.
Test Equipment Needed
Digital Voltmeter
Frequency Counter
Sony Disc YEDS-18
Bose ® CD Alignment Fixture (176318)
1. PLL Free Run Frequency (VCO)
Note: This test does not require a test disk
or the alignment fixture.
1.1 Connect the frequency counter to PCK
and ground.
1.2 Simulate a closed CD door by placing
an object between S501's two black posts
(the CD door latch can be used). Select CD
(S413).
1.3 Adjust R558 until the frequency counter
reads 4.320MHz ± 20kHz. (If the adjust-
ment is not done within 4 seconds, then CD
must be selected again).
2. Tracking Offset (TO)
Note: Remove any previously loaded test
disc. This test will not work with a disc
loaded.
2.1 Connect the cable from the test fixture
to connector P504 on the unit.
2.2 Connect a DC voltmeter to the positive
(+) and negative (-) terminals on the test
fixture.
2.3 Select TO on the fixture (press the ADV

CD TEST PROCEDURES

27
button until TO lights up). The meter should
read approximately 90mVdc.
2.4 Simulate a closed CD door by placing
an object between S501's two black posts
(the CD door latch can be used). Select CD
(S413).
2.5 After the focusing operation is com-
pleted, press ERASE (S403). The meter
should change from its previous reading in
step 2.3 (it will drop). If not, remove power
and repeat the test.
2.6 Adjust R511 until the meter reads
between -7 to 17mVdc.
3. E/F Balance (E/F)
3.1 Advance the alignment fixture (ADV
button) to the E/F setting and set the
voltmeter to read DC voltage.
3.2 Simulate a closed CD door by placing
an object between S501's two black posts
(the CD door latch can be used). Load the
YEDS-18 test disc, select CD (S413), and
play track 2.
3.3 Press STORE (S411). This puts the unit
in the E/F balance mode. The time display
will stop.
3.4 Adjust R506 until the meter reads
between - 10 to + 50mVdc.
4. Tracking Gain (TG)
4.1 Shut the unit off.
4.2 Advance the fixture to the TG setting
and set the voltmeter to read AC voltage.
4.3 Simulate a closed CD door by placing
an object between S501's two black posts
(the CD door latch can be used). Load the
YEDS-18 test disc, select CD (S413), and
play track 2.
4.4 Adjust R510 until the meter reads
between 440 to 500mVrms.