Harman Kardon FL-8385 Service manual
harman/kardon
Model FL8385
5 Disc Compact Disc Changer
SERVICE MANUAL
CONTENTS
LASER BEAM SAFETY PRECAUTIONS………2
OTHER PRECAUTIONS …...................…....… 3
SPECIFICATIONS .........................….….......... 4
FRONT PANEL CONTROLS……….. ... .…...... 5
REAR PANEL CONNECTIONS...........……...... 8
REMOTE CONTROL FUNCTIONS……….…….9
BASIC TROUBLESHOOTING GUIDE………...10
GENERAL UNIT EXPLODED VIEW ….. .….. ..11
5 CD MECHANISM EXPLODED VIEW ……….12
BLOCK DIAGRAM …………………….………...13
harman/kardon, Inc.
250 Crossways Park Dr.
Woodbur y, New York 11797 Rev1 3/ 2004
TEST PROCEDURE…................…..……....… 14
CIRCUIT DESCRIPTION……….. ... ……........ 16
DETAILED TROUBLESHOOTING …………… 20
SEMICONDUCTOR IDENTIFICATION..……... 26
MECHANICAL PARTS LIST .......…..……….... 49
ELECTRICAL PARTS LIST .......…………….... 51
PRINTED ClRCUlT BOARDS .....……… …..... 60
SCHEMATIC DIAGRAMS..................….…...... 64
PACKAGE …………………………………..……70
FL8385
2
LASER BEAM SAFETY PRECAUTIONS
CLASS 1 LASER PRODUCT
CAUTION
Invisible laser radiation when the unit is open.
Do not stare into beam.
harman/kardon
CAUTION: USE OF ANY CONTROLS, ADJUSTMENT, OR
PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN
MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
Do not look directly at the laser beam
coming from the pickup or allow it to
strike against your skin.
This compact disc player uses a pickup that emits a laser beam. The laser beam is emitted from the
location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 1 foot away
from the pickup lens when the diode is turned on. Do not look directly at the laser beam.
CAUTION:
Using controls and adjustment, or doing procedures other than those specified herein, may result in
hazardous radiation exposure.
FL8385
3
SAFETY PRECAUTIONS
WARNING
To prevent fire or shock hazard, do not
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FL8380
This symbol is intended to alert the user to
the presence of uninsulated "dangerous
voltage" within the product's enclosure that
may be of sufficient magnitude to constitute a risk of electric shock to persons.
This symbol is intended to alert the user to
the presence of important operating and
maintenance (servicing) instructions in the
literature accompanying the appliance.
Caution: To prevent electric shock do not use this
(polarized) plug with an extension cord, receptacle or other outlet unless the blades can be
fully inserted to prevent blade exposure.
Attention: Pour prevenir les chocs electriques ne pas
utiliser cetre fiche polarisee avec un
prolongateur, une prise de courant ou une autre sortie de courant, sauf si les lames prevent
etre inserees a fond-sans en laisser aucune
partie a decouvert.
expose the unit to rain or moisture.
HANDLING LASER PICKUP
The laser diode in the optical system of this player can be damaged by electrostatic discharge from
your clothes or your body. Proper electrostatic grounding for service personal is required during servicing.
BEFORE REPAIRING THE COMPACT DISC PLAYER
Preparation
Human Body Grounding:
Many of the components used in this compact disc player, including the laser pickup, are sensitive to
electrostatic discharge. Service personal should be grounded with an electrostatic armband (1 Mohm).
Caution:
Static charge on clothing does not escape through a body grounding wrist band.
Be careful not to contact the pickup or electrical components with your clothing.
Workbench and Tool Grounding:
A properly-grounded electroconductive plate (1Mohm) or metal sheet should be fitted to the workbench
surface. Tools and instruments (such as soldering irons and scopes) should be grounded to prevent AC
leakage.
Note: Laser diodes are so susceptible to damage from static electricity that, even if a static discharge does
not ruin a diode, it can shorten its life or cause it to work improperly.
FL8385
4
TECHNICAL SPECIFICATIONS 15
FL8385 TECHNICAL SPECIFICATIONS
Signal Format
Sampling Frequency 44.1kHz
HDCD Processing Burr-Brown™ PCM1732
D/A Conversion Dual 18-Bit
Oversampling 8 Times
Discrete An al o g Outp ut Section
Error Correction CIRC System
Frequency Response 20Hz – 20kHz +0, –1dB
THD (1KHz) <0.02% @1kHz (30KHz Filter)
THD) (1KHz) <0.02% @1kHz (No Filter)
THD 20Hz~2 0KH z 0dB <0.02% @1kHz (3 0KH z Filter)
Dynamic Range >97dB
S-Noise Ratio 0dB A-weighted (A Filter) >97dB
Channel Separation 1KHz 0dB (30KHz Filter) 80dB
Channel Balance ±0.5dB
De-emphas i s ( 5KH z,16KHz) ±0.5dB
Line-Level Output (no HDCD) 1.0 Vrms ±1dB
Line-Level Output (HDCD Output) 2.0 Vrms ±2dB
Digital Output Coax
Headpho ne output specificati o n un der 32 ohm lo a d
Maximu m Headphone Output Level 1KHz 0dB 1.5Vp-p
Frequency Response (20~20KHz) ±1dB
THD 20~20KHz 0dB (30KHz Filter) 0.1%
Test Disc Specification
Typical Limit
Black Dot TCD 725B 1000um 600um
Interruption MCD-131 900um 600um
Finger print 75um 65um
Vertical Deviation MCD-151 0.92mm 0.92mm
Eccentricity TCD 712 40um 140um
8cm test disc TCD 783 Last Track Last Track
Access Time 1st to last track YEDS18 4 se c 10 sec
General
Power Requirement 120V/60Hz
Power Consumption ≈20 Watts
Dimensions Height 5.1" (129mm)
Width 17.3" (440mm)
Depth 15.2" (386mm)
Weight 14.5 lb (6.6kg)
harman/kardon
Depth measurement inc ludes knobs and buttons. Height m easurement includes feet and chassis.
All features and specifications are subject to change without notice.
FRONT-PANEL CONTROLS
1 Power Switch: Press this switch to apply power
to the FL 8385. When the FL 8385 is first turned on
by pressing this switch, the
Status Mode Indicator
2 will turn blue, and the Information Display #
will light. Press the switch again to turn the unit off; the
Status Mode Indicator 2 will turn amber, indicating
that the unit is in a Standby mode.When the FL 8385
is connected to a switched AC outlet, such as those
found on the back of many audio products, it will
return to the Standby mode when power is applied to
the switched outlet without any further press of the
switch.
2 Status Mode Indicator: When the FL 8385 is
in the On mode, this indicator will glow blue.When
the unit is off, the indicator will glow amber, indicating
that the unit is still connected to the AC main supply.
3 Headphones Jack: Connect a set of standard
headphones to this jack for private listening.
4 Headphones Level Control: Tu rn this knob to
increase or decrease the volume level for headphones
connected to the FL 8385’s
Headphones Jack 3.
Note that changing this level will not change the sound
level for the unit’s main output, as that remains constant.
NOTES:
• Always adjust the headphones level to the minimum
possible to avoid the possibility of damage to the listener’s hearing from unwanted white noise or other
transient noises.
• When inserting a disc, wait until the FL 8385 has
recognized the disc before using headphones in
order to avoid the possibility of hearing potentially
damaging white noise.
5 CD Drawer: This drawer holds the discs that will
be played. Press the
Open/Close Button 6 to open
the drawer so that discs may be inserted.
6 Open/Close Button: Press this button to open
or close the disc drawer. DO NOT push the drawer
to close it or damage to the transport mechanism
may result.
7 Search Button: Press one side of this button to
search forward
—
or the other side of the button
to search backwards
‚
through a disc to locate a
particular portion of the disc being played.
8 Skip Button: Press one side of this button to
move to the next track
—Íor the other side of the
button to move back to the previous track
Í
fifi
on
the disc being played.
9
Stop Button: Press this button to stop the disc cur-
rently being played.
) Play/Pause Button: Press this button to start the
playback of a CD. If the CD drawer is open, pressing
this button will automatically close the drawer. Press this
button once during play to momentarily pause a disc.
When the button is pressed again, the disc will resume
play at the point it was paused.
! Disc Skip Button: Press this button to change to
the next disc. If a disc position is empty, the FL 8385
will automatically search for the next position that contains a disc.
@ Disc Select Buttons: Press one of these buttons
to select the disc in a specific position in the CD drawer.
# Information Display: This display provides details
about the operation of the FL 8385.
$ Remote Sensor: The sensor behind this window
receives commands from the remote control. Keep
this area clear if you wish to use the FL 8385 with a
remote control.
2
3
4
5
7
8
9
)!
#
$@
6
1
FL 8385
Power Phones Phones Level
PLAY/PAUSE
123
45
DISK SKIP
STOP
SEARCH SKIP
››ÍÍ‹‹››‹‹
FRONT-PANEL CONTROLS
FRONT-PANEL CONTROLS 55
NOTE: To make it easier to follow the instructions that refer to this illustration, a larger copy may be downloaded from the Product Support section for this product at
www.harmankardon.com.
1 Power Switch
2 Status Mode Indicator
3 Headphones Jack
4 Headphones Level Control
5 CD Drawer
6 Open/Close Button
7 Search Button
8 Skip Button
9 Stop Button
) Play/Pause Button
! Disc Skip Button
@ Disc Select Buttons
# Information Display
$ Remote Sensor
FL8385
5
harman/kardon
FRONT-PANEL INFORMATION DISPLAY
6 FRONT-PANEL INFORMATION DISPLAY
A Random Indicator
B Sequential Indicator
C Disc Number Display
D Track Number Display
E Time Display
F Remaining Tracks Display
G Total Time Indicator
H Program Indicator
I Remaining Time Indicator
J Intro Scan Indicator
K Loaded Disc Indicators
L HDCD Indicator
M Repeat Indicator
N Disc Mode Indicator
O Single Mode Indicator
P Pause Indicator
Q All Mode Indicator
R Play Indicator
NOTE: To make it easier to follow the instructions that refer to this illustration, a larger copy may be downloaded from the Product Support section for this product at
www.harmankardon.com.
A Random Indicator: This indicator will light when
any of the three Random modes described on page
12 have been selected.
B Sequential Indicator: This indicator will light
when the Random, All, Sequential playback mode has
been selected. The FL 8385 will play all tracks on the
current disc in random order, then advance to the next
available disc and play all of its tracks in random order,
and so on until all discs have been played once.
C Disc Number Display: The current disc number
will be displayed here.
D Track Number Display: The current track
number will be displayed here.
E Time Display: This indicator will display either the
total running time of the disc currently playing, the total
running time of the track currently playing or the time
remaining on the currently playing disc. See page 12
for more information on the
Time Display E.
F Remaining Tracks Display: When a disc is first
selected, the numbers for each of the tracks on that
disc will light, up to 16 tracks. During playback the
current track number will flash, and all remaining
track numbers will remain lit. The numbers of the
preceding tracks will go dark. When playback is
stopped, all of the track numbers available on the
current disc will light, even if they were previously
played. If a disc contains more than 16 tracks, the
higher-numbered tracks may be played and their numbers will appear in the
Track Number Display D
when selected, but those numbers will not appear in
the
Remaining Tracks Display F.
G Total Time Indicator: This indicator will light
when the total time on the current disc has been
selected for display. See page 12 for more information
on the time display function.
H Program Indicator: This indicator will light when
the FL 8385 has been placed in programmed-play
mode. It will remain lit while a play list is being programmed and during playback of a play list.
I Remaining Time Indicator: This indicator will
light when the remaining time on the current disc or in
the current track has been selected for display. See
page 12 for more information on the time display
function.
J Intro Scan Indicator: This indicator will light
when the Intro Search mode has been selected as
described on page 13. This mode enables you to
search for a particular track by previewing the first 10
seconds of each track of each loaded disc, and then
selecting the desired track.
K Loaded Disc Indicators: When the unit is turned
on, the indicators for all disc positions will light, with
the current disc indicated by a flashing red ring. As the
FL 8385 circulates through all disc positions, the indicators for positions found to be empty will go out. This
display will refresh any time the
CD Drawer 5 is
opened.
FL8385
6
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A
R
Q
M
O
P
BD
N
L
C
K
J
I
E
G
H
F
FRONT-PANEL INFORMATION DISPLAY 7
FRONT-PANEL INFORMATION DISPLAY
L HDCD Indicator: This indicator will light when a
disc encoded in the HDCD format is played. In order
to benefit from the FL 8385’s HDCD decoding, the
Analog Audio Outputs ∞ must be connected to
corresponding inputs on your receiver or processor,
and those inputs must be selected. If you have only
connected the
Coaxial Digital Audio Output ™ to
your receiver or processor, you will not hear HDCD
playback unless your receiver/processor includes an
HDCD decoder. Playback of non-HDCD-encoded
discs using the
Analog Audio Outputs ∞ will be
enhanced due to the improved filters incorporated in
the FL 8385’s microprocessor.
M Repeat Indicator: This indicator will light when
any of the four repeat modes described on pages 13
and 14 has been selected.
N Disc Mode Indicator: This indicator will light
when either the Random, All Tracks/Discs or Repeat
Disc modes has been selected.
O Single Mode Indicator: This indicator will light
when either the Random 1 disc or Repeat 1 track or
disc modes has been selected.
P Pause Indicator: This indicator will light when
playback has been paused.
Q All Mode Indicator: This indicator will light
when any of the Random All Sequential, Random
All Tracks/Discs or Repeat All Discs modes has
been selected.
R Play Indicator: This indicator will light during
playback.
FL8385
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harman/kardon
8 REAR-PANEL CONNECTIONS
REAR-PANEL CONNECTIONSREAR-PANEL CONNECTIONS
8 REAR-PANEL CONNECTIONS
™
¢
∞
£
¡
¡ AC Power Cord
™ Coaxial Digital Output
£ Remote Control Output
¢ Remote Control Input
∞ Analog Audio Outputs
¡ AC Power Cord: Connect this plug to an AC outlet.
If the outlet is switch-controlled, make certain that the
switch is in the ON position.
™ Coaxial Digital Output: Connect this jack to the
coaxial-digital input of a digital audio/video receiver or an
external digital-to-analog converter for direct access to
the digital signals of the FL 8385. DO NOT connect this
jack to the standard audio inputs of any device.
£ Remote Control Output: Connect this jack to the
input of another compatible Harman Kardon remote
controlled device to have the remote sensor on the
FL 8385 provide signals to other products.
¢ Remote Control Input: Connect the output of a
remote infrared sensor or the remote control output of
another compatible Harman Kardon product. This will
enable the remote control system to operate even
when the front panel
Remote Sensor $ is blocked.
It will also allow use of the FL 8385 with optional,
external control systems.
∞ Analog Audio Outputs: Connect these jacks to
the analog CD audio inputs of your receiver, surround
processor or preamplifier.
NOTE: To make it easier to follow the instructions that refer to this illustration, a larger copy may be downloaded from the Product Support section for this product at
www.harmankardon.com.
FL8385
8
harman/kardon
a Disc-Select Buttons: Press one of these
buttons to select the disc in a specific position in the
CD drawer.
b Numeric Buttons: Press these buttons to select
a specific track on a disc.The FL 8385 will immediately go to the track and begin to play it. These buttons are also used to enter track numbers into the
memory for preprogrammed-play lists. (See page 13
for complete information on programming the
FL 8385.)
c Clear Button: Press this button to remove tracks
from a programmed sequence. Each press of the button will remove one track, starting with the last track
programmed to play. (See page 13 for complete information on programming the FL 8385.)
d Search Buttons: Press these buttons to search
forward
—
or backwards
‚
through a disc to
locate a particular portion of the selection being
played.
e Skip Buttons: Press one of these buttons to
move to the next track
—Íor to move back to the
previous track
Í
‚
on the disc being played.
f Stop Button: Press this button to stop the disc
currently being played.
g Play Button: Press this button to start the play-
back of a CD. If the CD drawer is open, pressing this
button will automatically close the drawer.
h Random Button: Press this button to play all of
the tracks on a disc in a random order. (See page 12
for more information.)
i Pause Button: Press this button once to
momentarily pause a disc.When the button is pressed
again, the disc will resume play from the point at which
it was paused.
j Program Button: This button is used to pro-
gram the playback of a disc in a particular order. (See
page 13 for complete instructions on programming
the FL 8385.)
k Time Button: In normal operation, the display
will show the running time of the track being played.
Press the button once to check the time remaining for
the track in play. Press the button again to view the
total play time remaining for the disc in play. (See
page 12 for more information.)
l Intro Button: Press this button to put the FL 8385
into the Intro Scan mode.When you press this button, the
unit will play the first 10 seconds of each track on the
disc, and then move to the next track. Press the button
again to defeat the function and continue full play of the
current track. (See page 13 for more information.)
m Repeat Button: Press this button once to continu-
ously repeat the track currently being played. Press it a
second time to repeat the entire disc. (See pages 13 and
14 for more information.)
n Disc Skip Buttons: Press these buttons to
change to the next disc. If a disc position is empty, the
FL 8385 will automatically search for the next position
that contains a disc.
o Power On Button: When the FL 8385 is plugged
into an active AC outlet, press this button to turn the unit
on. The
Status Mode Indicator 2 will turn blue. If the
unit is plugged into a switched outlet, power must be
applied to the switched outlet in order for the
Power On
Button
o to be effective.
p Power Off Button: Press this button to turn the
unit off; the
Status Mode Indicator 2 will turn amber,
indicating that the unit is in a Standby mode.
REMOTE CONTROL FUNCTIONS 9
REMOTE CONTROL FUNCTIONS
FL 8385 RC
SKIP
SEARCH
RANDOM
PROGRAM
TIME
INTRO
REPEAT
+
–
DISC NO.
0
456
321
345
21
789
CLEAR
TRACK NO.
b
c
a
d
e
f
g
h
i
j
k
l
m
n
n
n
n
nnn
o
n
n
n
n
n
n
DISC
SKIP
POWER
OFFON
p
a Disc-Select Buttons
b Numeric Buttons
c Clear Button
d Search Buttons
e Skip Buttons
f Stop Button
g Play Button
h Random Button
i Pause Button
j Program Button
k Time Button
l Intro Button
m Repeat Button
n Disc Skip Buttons
o Power On Button
p Power Off Button
NOTE: To make it easier to follow the instructions that
refer to this illustration, a larger copy may be downloaded from the Product Support section for this product at www.harmankardon.com.
FL8385
9
harman/kardon
14 TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
SYMPTOM POSSIBLE CAUSE SOLUTION
No lights on front panel • No AC power • Make certain that the AC power cord is plugged into a live outlet
Remote does not appear to operate • Main Power Switch turned off • Turn on Main Power Switch
• Weak batteries • Install fresh batteries, observing polarity indications
• Blocked sensor • Remove obstructions from the front panel sensor, or connect
a remote sensor to the
Remote Control Input ¢ jack
0on the rear panel
Front panel lights but CD does not play • Disc upside down • Turn CD over so that label side faces up
• Moisture inside unit • Leave the unit turned ON for 30 minutes to allow
moisture to evaporate
Play indicator lights but no sound is heard • Receiver or preamp and amp • Turn on all necessary equipment
not turned on
• Poor connections • Make certain connections are secure and made to
• Wrong source selected the correct (e.g.,
CD) input
• Select CD source on receiver or preamp
Sound skips or stutters during play • Disc may be damaged • Try another disc
• Surface vibrations • Isolate the unit from vibration by placing it on a firm surface
or move it further away from speakers
Sound is continually distorted • Incorrect input • Make certain that the FL 8385 is connected to a line-level
audio input, NOT a digital audio or phono input
FL8385
10
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FL8385
11
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FL8385
FL8385
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5-CD MECHANISM 9600-505007-001
FL8385 BLOCK DIAGRAM
13
FL8385
AN4801
harman/kardon
FL8385
14
harman/kardon
Audio Characteristics Test Procedure
Test Equipment
1. 3346 CD Player Evaluating Filter x 2 (NF Electronic Instrument)
2. VP7722 Panasonic Audio Analyzer
3. Sony YEDS18 Test CD disc
Procedure
Equipment Setup
1. The audio output of the CD player under test is connected to the CD filter L
& R inputs.
2. The outputs from the filter are connected to the Audio Analyzer.
Check the output Voltage
1. Set the mode of the filter to ‘ THRU’
FL8380
2. Set the mode of Audio Analyzer to ‘ LEVEL’ mode
3. Select track 2 of the test disc and play the CD disc
4. The output voltage and gain of the R & L channels are taken by pressing
the respective buttons on the control board of Audio Analyzer.
Frequency Response
1. Set the mode of the filter to reference level mode.
2. Select the track 3, 4, 5, and 6 of the test disc and run it under ‘ Play’ mode.
3. Check the output of the R & L Channels
Total Harmonic Distortion
1. Set the mode of the filter to ‘ DIST/CH-SP’ mode
2. Set the audio analyzer to ‘ DIST’ mode.
3. Set the unit of the audio analyzer to ‘ %’ mode
4. Select the track 2, 4, and 5 on the test disc and run them under ‘ PLAY’
mode
5. Check the % of each R & L channels
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Signal to Noise Ratio
1. Set the mode of the filter to ‘ S/N’ mode
2. Play track 2 of the test disc
3. The unit of the audio analyzer is set to dB mode
4. Press the S/N key on the control panel of the audio analyzer
5. Play track 7
6. Measure the data of S/N ratio
Dynamic Range
1. Set the mode of the filter to ‘ D-Range’ mode
2. Set the audio analyzer to ‘ DIST’ Mode
3. Set the unit of the audio analyzer to ‘ dB’ mode
4. Play track 17of the test disc
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FL8380
5. The dynamic range should be |A| + 60dB
Channel Separation
1. Set the mode of the filter to ‘ DIST/CH-SP’ mode
2. Set the audio analyzer to ‘ LEVEL’ mode
3. Play the tracks 8, 9, 10 & 11
4. The measured results is the difference between L & R channel
De-emphasis
1. Press the ‘ THRU’ button of the CD filter
2. Play the track 2 of the test disc
3. Press the ‘ Relative Level’ and make it ‘ ON’
4. Select the track 12 and 13 and measure the L & R channels value
32
31
2821302325
24
GCTRL
To Focus System
TBAL
Subtraction
R10
TENC8TEOUT
V
GCTRL
C2
C15C5R5
V
REF1VREF2
R15
R14
V
TBAL
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FUNCTION DESCRIPTION
Tracking System
E
A B
C D
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FL8380
F
PDIC
The tracking error output of E and F is given to Pin 25 (TEOUT). C8 is required for
oscillation-proof. R10 is chosen such that TEOUT of Pin 25 become 1.4Vp-p.
During alignment procedure, the DSP IC (MN662790) will adjust the tracking balance
voltage V
from Pin 31. V
TBAL
varies with reference to the center voltage V
TBAL
(=1.65 V)
REF2
within ±0.5 V.
The tracking gain will change according to the type of disc. For normal disc or CDR disc,
V
is set to V
GCTRL
; for CDRW disc V
REF2
focus gain is changed too.
GCTRL
is set to V
- 0.75 V. At the same time, the
REF2
36
34
282927
26
GCTRL
FBAL
Subtraction
R7
FENC4FEOUT
V
GCTRL
C2C3R6
V
FBAL
35333
5
C35
C47
R27
R21
R20
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Focus System
E
A B
C D
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FL8380
F
PDIC
The focus error output of A, B, C and D are given to Pin 27. C4 is required for oscillationproof. R7 is set such that FEOUT of Pin 27 becomes 1.46 Vp-p.
During alignment procedure, the DSP IC (MN662790) will adjust the focus balance voltage
V
from Pin 30. V
FBAL
varies with reference to the center voltage V
FBAL
(=1.65 V) within
REF2
±0.5 V.
The focus gain will change according to the type of disc. For normal disc or CDR disc,
V
is set to V
GCTRL
; for CDRW disc V
REF2
tracking gain is changed too.
GCTRL
is set to V
- 0.75 V. At the same time, the
REF2
36
34
GCTRL
V
GCTRL
C2
35333
5
C35
C47
R27
R21
R206EQ
AGC
8910
17
RF
ENV
11
12
V
CC1
ARF
V
CC1
NRFDET
ENV
28
C29
C39
C28
C38
RFOUT
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RF, EQ, AGC
DETECTION
DETECTION
harman/kardon
FL8380
The signals A, B, C and D input from PDIC are composed into the RF signal by the RF
Addition Amp, then output from RFOUT of Pin 5. This Amp is designed so that RFOUT is
about 0.5 Vp-p for normal CD disc (about 0.4 Vp-p for CDR and 0.12 Vp-p for CDRW).
RF signal from Pin 5 is then input to the AGC block through the EQ block (the EQ
characteristic is fixed for single speed operation in this design). It is then gain-controlled
and output to Pin 10 ARF. The AGC block maintains the output level of ARF to about
1.0Vp-p for all types of disc. C38 connected to Pin 9 is for the AGC loop filter.
The RF Detection block detects the amplitude of the RF signal inputted from the EQ block.
Inputted RF signal is detected after passing through a high-pass filter. Detection level is
changed in accrodance with the voltage of GCTRL Pin 28.
The ENV detection block detects the fluctuation of the 3T-composition in the RF signal
which is needed for focus balance adjustment. C39 connected to Pin 11 forms a filter for
detecting the signal fluctuation. The ENV output signal from Pin 12 is filtered by C29.
19LD2
1
V
CC1
PD
170mV
LASER UNIT
C33
R18Q1LDON
20
R
V
CC1
R
R/2
V
REF1
22
R
V
CC2
R
R/2
V
REF2
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APC
The laser diode has large negative temperature characteristic in its optical output when
driven with a constant current on laser diode. Therefore, the output on processing monitor
FL8380
photo diode, must be a controlled current for getting regular output power, thus the APC
(Auto Power Control) circuit is composed.
Reference Power Supply
A reference power supply for servo is built-in. The current capacity of the reference supply
is about 3 mA.
V
= 1/2 V
REF1
= 2.5 V
CC1
V
= 1/2 V
REF2
where V
= 1.65 V
CC2
= 5 V and V
CC1
= 3.3 V
CC2
FL8385
20
harman/kardon
FL8380
FL8385
21
harman/kardon
FL8380
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