Bose Lifestyle 5 Owners Manual

10
CD TERMS
Major Components of the System
ASP: Analog Signal Processor. The component in the CD circuitry that contains the RF ampli-
fier, VCO, and the tracking, focus, and sled servos.
DSP: Digital Signal Processor. The component in the CD circuitry that performs slicing, EFM
demodulation, CIRC decoding, error correction and concealment, track access, CLV regula-
tion, and drives the D/A.
Digital to Analog Converter (D/A, DAC): A device that converts digital information (usually a
serial data stream)...

11
CD TERMS
Signal Names
(continued)
TAP: Test Access Port. A 3 pin test interface used by automated test to control and observe
the board under test.
TDO: Tracking Drive Output.
TEAO: Tracking Error Amplifier Output.
TGL: Tracking Gain Low.
THLD: Tracking Hold.
TOFF: Tracking Off
TPA+: Tracking Pre-Amplifier (+ input).
TPA-: Tracking Pre-Amplifier (- input).
TPAO: Tracking Pre-Amplifier Output.
VCOO: VCO Output
Vref1: The reference voltage used by the RF amplifier in the ASP.
Vref2: The unbuffered...

12
THEORY OF OPERATION
Overview
The Lifestyle¨ Model 5 music center is a self-contained CD player, AM/FM tuner, preamplifier,
and control center for use with Bose¨ powered speaker systems. In addition to the two internal
sources (CD and tuner), it also allows for up to three external devices to be connected (i.e.
AUX, VIDEO, and TAPE). It uses a Radio Frequency (RF) remote control that allows the unit to
be operated from different rooms within a house without the need for a line-of-sight path back
to the...

13
THEORY OF OPERATION
There is one main serial data bus that controls source selection IC U101, volume control IC
U103, PLL frequency synthesizer U302, and EEPROM U401. The clock and data information
for all of these devices is sent out on U402, pins 5 and 7. However, U401, U302, U101 and
U103 each have their own chip select line. Data is sent to U302 whenever the tuner frequency
is changed. During the serial data transmission, U302, pin 3 is driven high. Data is sent to
U101 or U103 whenever a new...

14
THEORY OF OPERATION
U103Õs output signal is buffered by U105, and is fed to the A and B outputs. These outputs are
independently mutable through transistors Q103-106 and Q203-206. Each pair of transistors
provides approximately 80dB of attenuation when muted. These mute transistors are con-
trolled by the signals on J9-7 and J9-8. U103Õs output signal is also routed to headphone
amplifier U104. This provides gain and buffers the signal in order to drive a low impedance
load. When the headphones are...

15
THEORY OF OPERATION
The E and F signals are amplified and subtracted. This produces the tracking error signal
TEAO (U501, pin 7 ). The F channelÕs gain is adjusted by E-F balance potentiometer R506.
The TEAO signal is used by the anti-shock circuit, the track jump detection circuit, and the
tracking servo. The track jump detection output is sent to U502 on the TES line (U501, pin 47).
R510, which is connected to TPA+ (U501, pin 13 ), adjusts the tracking gain. This signal is
amplified and filtered. It...

16
THEORY OF OPERATION
U505Õs oscillator is obtained from a 4MHz ceramic resonator (X502). U505 is reset by a rising
edge on pin 1 that is caused by R573 and C574. This occurs automatically on power-up, but
may be forced manually by depressing S502 (if installed). U505 communicates with U502 on a
serial bus (U502, pins 50  through 54). U505 sends servo commands for focusing and track
access to U502. U502 sends subcode Q data to U505 which extracts track, time and table of
contents information from it....

17
THEORY OF OPERATION
oscillator tuned circuit. The tuned output appears on pin 12 and is fed to AM buffer FET Q300.
The buffered output is sent to U301, pin 27. U301 contains the AM RF amplifier, mixer, IF
amplifier, AM detector and AM stop level detection. Potentiometer R339, which is connected to
pin 16, sets the AM stop level to 70dB uV/M (nominal). The IF output signal appears on pin 26
and is filtered by IF filter T307. The signal is then fed back into U301, pin 24 for AM detection.
The AM...

18
See Figure
6 for a side
view of this
assembly.
Figure 3. Labelled Exploded View 

19front of the base assembly (19). Lower the
cover into position.
4.3 There are two black tabs on the bottom
of the right cover. Push them in slightly and
snap the cover into place.
4.4 Replace the two screws (18B) that
secure the right cover to the base.
4.5 Replace the left cover assembly (Pro-
cedure 2).
5. CD Mechanism Removal
Note: Refer to Figures 3, 4 and 7 for
Procedures 5 and 6.
5.1 Remove the left cover assembly (Pro-
cedure 1) and the door/right cover assem-
bly (Procedure 3).
5.2 Lift the CD...