Bose Life CD5 Series I Service Manual page 31

CD ALIGNMENT PROCEDURES
(Without Fixture)
Note: Refer to Figure 12 throughout this
procedure.
Test Equipment Needed
Voltmeter (input impedance > 10MΩ)
Frequency Counter
Sony Disc YEDS-18
Audio Oscillator
1. PLL Free Run Frequency (VCO)
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 four seconds, then
CD must be selected again).
2. Tracking Offset
Note: Remove any previously loaded test
discs. This test will not work with a disc
loaded.
2.1 Connect a DC voltmeter between P504
pins 2 (TDO) and 1 (Vref3). The meter
should read approximately 90mVdc.
2.2 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).
2.3 After the focusing operation is com-
pleted, press ERASE (S403). The meter
should change from its previous reading in
step 2.1 (it will drop). If not, remove power
and repeat the test.
2.4 Adjust R511 until the meter reads
between -7 to +17mVdc.
CD TEST PROCEDURES
30
3. E/F Balance
Note: The test disc is required for this test.
Construct the filter indicated in Figure 12
and connect it to P504 pin 4 (TEAO).
3.1 Connect a DC voltmeter between the
filter output and P504 pin 1 (Vref3).
3.2 Load the test disc, select CD (S413),
and play track 2. Skip forward using S408.
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
Note: Shut the unit off. Construct the filter
indicated in Figure 12 and connect it (FLT
IN) to P504 pin 6 (TPA+).
4.1 Connect an AC voltmeter between the
filter output (FLT OUT) and P504 pin 1
(Vref3).
4.2 Connect a 100kΩ resistor to P504 pin 7
(TPA-). Connect an oscillator to the
resistor's other end and apply a .5Vrms,
1.7kHz signal to it.
4.3 Insert the test disc and select CD
(S413) and play track 2.
4.4 Adjust R510 until the meter reads
between 26.3 ± 1.5mVrms.
5. Focus Gain
Note: Construct the filter indicated in
Figure 12 and connect it (FLT IN) to P504
pin 5 (FEAO).
5.1 Connect an AC voltmeter between the
filter output (FLT OUT) and P504 pin 1
(Vref3).
5.2 Connect a 300kΩ resistor to P504 pin 8
(FSW). Connect an oscillator to the
resistor's other end and apply a .5Vrms,
1.7kHz signal to it.