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The Harman Kardon
Model FL 8370
COMPACT DISC CHANGER
Technical Manual
FL 8370 1 2 3 Skip Play Pause
4 5 Disc Skip Search Stop Random
Open/Close
Power Phones Phones Level Time Repeat Intro Clear Program
CONTENTS
1. LASER BEAM SAFETY PRECAUTIONS ............. 2 9. BLOCK DIAGRAM ............................................. 70
2. CONTROL AND FUNCTIONS ............................. 4 10. SCHEMATIC DIAGRAMS .................................. 71
3. SPECIFICATIONS AND FEATURES ..................... 7 11. PCB LAYOUT ..................................................... 74
4. AUDIO CHARACTERISTICS TEST PROCEDURE 12. DISASSEMBLY INSTRUCTIONS ........................ 89
.............................................................................9 13. GENERAL UNIT PARTS LIST .............................. 94
5. CIRCUIT DESCRIPTION ....................................11
6. CRITICAL I.C. SPECIFICATION ........................ 18
7. PART LIST ......................................................... 49
8. TROUBLE SHOOTING GUIDE .......................... 64
* Harman/ kardon continually strives to improve its products. The Fl8370 Compact Disc Changer design and
specifications are subject to change and may differ from the published specifications and descriptions, but will
always equal or exceed the original specifications unless otherwise stated.
DANGER: Invisible laser radiation when open and interlock failed or defeated.
AVOID DIRECT EXPOSURE TO BEAM.
Parts and Service Office
250 Crossways Park Dr., Woodbury, N.Y. 11797
1112-FL8350 P9603 1200 Printed in Hong Kong
LASER BEAM SAFETY PRECAUTIONS
CLASS 1 LASER PRODUCT
CAUTION
Invisible laser radiation when the unit is open.
Do not stare into beam.
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.
2
SAFETY PRECAUTIONS
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 consti-
tute 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, recep-
tacle 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 au-
tre sortie de courant, sauf si les lames prevent
etre inserees a fond-sans en laisser aucune
WARNING partie a decouvert.
To prevent fire or shock hazard, do not
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.
3
FL8370
Front Panel Controls
22 21 19 17 15 13
20 18 16 14 12
FL 8370 1 2 3 Skip Play Pause
4 5 Disc Skip Search Stop Random
Open/Close
Power Phones Phones Level Time Repeat Intro Clear Program
1 2 3 4 5 6 7 8 9 10 11
1 Power Switch: Press this switch in play. 16 Skip Button: Press one side of
to apply power to the Fl8370. When this button to move to the next track
the FL 8370 is first turned on by 7 Repeat Button: Press this button or the other side of the button to
pressing this switch, the Status-Mode once to constantly repeat the track move back to the previous track
Indicator 2 will turn green, and the currently being played. Press it a on the disc being played.
Information Display 20 will illuminate. second time to repeat the entire disc.
Press the switch again to turn the unit 17 Search Button: Press one side of
off; the Status-Mode Indicator will 8 Intro Button: Press this button to this button to search forward or
turn amber, indicating that the unit is put the Fl8370 in the Intro Scan mode. the other side of the button to search
in a Standby mode. When the FL When you press the button, the unit backwards through a disc to
8370 is connected to a switched AC will play the first 10 seconds of each locate a particular portion of the disc
outlet, such as those found on the track on the disc, and then move to being played.
back of many audio products, it will the next track. Press the button again
return to the Standby mode when to defeat the function and continue 18 Disc Skip Button: Press this
power is applied to the switched full play of the current track. button to change to the next disc. If a
outlet without any further press of the disc position is empty, the FL8370 will
switch. 9 Clear Button: Press this button to automatically search for the next
remove tracks from a programmed position that contains a disc.
2 Status Mode Indicator: When the sequence. Each press of the button
Fl8370 is in the ON mode, this will remove one track, starting with 19 Disc Select Buttons: Press one
indicator will glow green. When the the last track programmed to play. of these buttons to select the disc in a
unit is off, the indicator will glow specific position in the CD drawer.
10 Program Button: This button is
amber, indicating that the unit is still
used to program the playback of a 20 Information Display: This display
connected to the AC mains supply.
disc in a particular order. provides details about the operation
3 Headphones Jack: Connect a set of the FL 8370.
11 Open/ Close Button: Press this
of standard headphones to this jack
button to open or close the disc 21 HDCD Indicator: This LED will
for private listening.
drawer. DO NOT push the drawer to light automatically when a CD with
4 Headphones Level Control: Turn close it or damage to the transport HDCD encoding is playing. No
this knob to increase or decrease the mechanism may result. further action is needed to enjoy the
volume level for headphones benefits of HDCD.
connected to the FL8370's
12 Random Button: Press this
button to put a disc into play, and to 22 Remote Sensor: The sensor
Headphones Jack 3 . Note that
have all of the tracks played in a behind this window receives
changing this level will not change the
random order. commands from the remote control.
sound level for the unit's main output,
as that remains constant. Keep this area clear if you wish to use
13 Pause Button: Press this button the FL 8370 with a remote control.
once to momentarily pause a disc.
5 CD Drawer: This drawer holds the
When the button is pressed again, the
discs that will be played. Press the
disc will resume play at the point it
Open/ Close button 11 to open the
was paused.
drawer so that discs may be inserted.
6 Time Button: Press this button to 14 Play Button: Press this button to
start the playback of a CD. If the CD
select the time display. In normal
drawer is open, pressing this button
operation, this display will show the
will automatically close the drawer.
running time of the track being played.
Press the button once to check the
15 Stop Button: Press this button to
time remaining for the track in play.
stop the disc currently being played.
Press this button again to view the
total play time remaining for the disc
4
FL8370
Rear Panel Connections
1 2 3 4 5
LEFT CAUTION MODEL NO: FL8370
HARMAN KARDON
OUT IN RISK OF ELECTRIC SHOCK
DO NOT OPEN NORTHRIDGE
CLASS 1 LASER PRODUCT
RIGHT CALIFORNIA, U.S.A.
SHOCK HAZARD : DO NOT OPEN.
SHOCKHAZARD : DO NOT OPEN.
AVIS:RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
AVIS:RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
DIGITAL AUDIO MADE IN CHINA
OUTPUT REMOTE OUTPUT
SERIAL NO.
This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference,
AC INPUT
and (2) this device must accept any interference
AC 117V / 60Hz received, including interference that may cause
20W PRODUCT COMPLIES WITH DHHS
undesired operation.
RULES 21CFR SUBCHAPTER J,
WARNING: "TO REDUCE THE RISK OF FIRE OR C US
ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE
APPLICABLE AT DATE MANUFACTURED:
TO RAIN OR MOISTURE." LR46800 (YCL).
HDCD and High Definition Compatible Digital CAN/CSA-C22.2 No.1-96
are registered trademarks of Pacific Microsonics, Inc. UL 1270
1 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.
2 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 FL8370. DO NOT connect this jack to the standard audio
inputs of any device.
3 Remote Control Input
Connect this jack to the input of anther compatible Haman Kardon remote controlled device to have the remote
sensor on the Fl8370 provide signals to other products.
4 Remote Control Output
Connect this 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 21 is
blocked. It will also allow use of the Fl8370 with optional, external control systems.
5 Fixed Audio Outputs
Connect these jacks to the analog CD audio inputs of your receiver, surround processor or preamplifier.
5
FL8370
Remote Control Functions
.1 Disc Select Buttons: Press one of these buttons to
select the disc in a specific position in the CD drawer.
8
2 Numeric Buttons: Press these buttons to select a
specific track on a disc. The FL8370 will immediately go
to the track and begin to play it. These buttons are also
used to enter track numbers into the memory for
DISC NO. preprogrammed-play lists.
1 2
3 Clear Button: Press this button to remove tracks from a
programmed sequence. Each press of the button will
1 3 4 5 remove one track, starting with the last track
programmed to play.
TRACK NO. DISC
1 2 3 SKIP 14 4
4 Search Buttons: Press these buttons to search forward
or backwards through a disc to locate a particular
4 5 6 REPEAT
portion of the selection being played.
10
13
2 5 Skip Buttons: Press one of these buttons to move to the
7 8 9 INTRO next track , or to move back to the previous track
12 on the disc being played.
0 CLEAR PROGRAM TIME 6 Stop Button: Press this button to stop the disc currently
11 being played.
3 10
SEARCH RANDOM
7 Play Button: Press this button to start the playback of a
9 CD. If the CD drawer is open, pressing this button will
4 8 automatically close the drawer.
SKIP
7
8 Random Button: Press this button to play all of the
5 6 tracks on a disc in a random order.
9 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
FL 8370 paused.
10 Program Button: This button is used to program the
playback of a disc in a particular order.
11 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.
12 Intro Button: Press this button to put the FL8370 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.
13 Repeat Button: Press this button once to continuously repeat the track currently being played. Press it a second
time to repeat the entire disc.
14 Disc Skip Button: Press this button to change to the next disc. If a disc position is empty, the FL8370 will
automatically search for the next position that contains a disc.
6
FL8370
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FL8370
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8
FL8370
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'
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
9
FL8370
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
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
10
FL8370
FUNCTION DESCRIPTION
1.RF Amp Block
1.1 RF Amplifier
The optical currents inputted through pins PD1(A+C) and PD2(B+D) are converted into voltages through
I-V amp, and they are added to RF summing amp. The voltage, converted from the photo diode
(A+B+C+D) signal, is outputted through RFO(pin74) and the eye pattern can be checked at this pin.
58K
PD1
65 - VA 10K
- RFO
+ I-V amp(1) 74
+
VC RF summing amp
VC
58K
PD2
RF-
66 - VB 10K
73
+
I-V amp(2)
VC
Figure 4. RF amp circuit
1.2 Focus Error Amp
The output of the focus error amp is the difference between I-V amp(1) output VA and
RF I-V amp(2) output VB. The focus error bias voltage applied to the (+) of focus error amp can be
changed by output voltage of D/A converter as shown in diagram, so that the offset of focus error amp
can be adjusted automatically by controlling 5 bits counter switches. Focus error bias can be adjusted
from the range of +100mV ~ -100mV by connecting the resistor on pin 63 (FEBIAS).
164K
32K
VB > - FE1
32K 59
VA > +
sev-stopb
160K
FEBIAS SW1
63
sev-stop
<5 Bit Counter> 4K
3K - fcmpo
X1 X2 X4 X8 X16
+
-
+ FEBIAS vc fe-stopb
Figure 5. Focus error amp circuit
note1> VA and VB refer to output signal of PD1 and PD2 I/V amp.
note2> sev-stopb,sev-stop,fe-stopb and fcmpo are internal signals
11
FL8370
1.3 Tracking Error Amp
The optical currents detected from the side photo diode (E and F) pf pick-up are inputted to the E and F
pin and converted into voltage signals by E I-V and F I-V amp. The output of tracking error amp
generates the difference between E I-V AMP and F I-V AMP voltage output.
The E-F balance can be adjusted by modifying the gain of E I-V AMP, and the tracking gain
can be adjusted automatically by controlling the peak voltage at pin TE2 by micom program.
TE1 TE2 LPFT
54 53 55
F 67 I-V AMP - Balance To ISTAT
-
Window Comp
68 I-V AMP +
E
Gain
EI Window Comp
3.3K
79 13K
16K
7.5K
1.5K
To ISTAT
110K
220K
27K
56K
13K
To TRCNT
75K
BAL < 4 : 0 >
GAIN_UP/DOWN
GAIN < 3 : 0 >
Figure 6. Tracking error amp circuit
1.4 Focus OK Circuit
The FOK is the output. The focus OK circuit generates a timing window to enable focus servo operation
from focus search status. When the difference of the RFO (pin74)signal and DC coupled signal
IRF(pin75) are above the predefined voltage the Focus OK circuit output (pin40) becomes active(High
output). The predefined voltage is -0.39V
40K
40K
RFO 74 - 57K FOK
-
IRF 75 + 40
40K +
90K
VC+0.625V
Figure 7. Focus OK circuit
12
FL8370
1.5 Mirror Circuit
IRF signal is amplified by the mirror amp, and the peak and bottom component of amplified signal are
detected by peak and bottom hold circuit. The peak hold circuit covers traverse signal of up to 100KHz
component and bottom hold circuit capable of covering the envelope frequency of disc rotation. The time
constant for the mirror hold must be sufficiently larger than that of the traverse signal.
- 1.5K
38K 1 MCP
2.5K +
17K
IRF 75 - Peak and
17K
Bottom
-
+ Hold
+
19K
96K
+
39 MIRROR
-
Figure 8. Mirror Circuit
1.6 EFM Comparator
The EFM comparator converts a RF signal into a binary signal.
Beacuse the asymmetry generated due to variations in disc manufacturing can not be eliminated by the
AC coupling alone, this circuit uses to control reference voltage of EFM comparator for eliminating
asymmetry.
40K
RFI 77 +
1 EFM
-
100K
+ 39 ASY
19K +
20K
-
-
100K
85K
Figure 9. EFM Comparator & asymmetry circuit
13
FL8370
1.7 Defect Circuit
The RFO signal bottom, after being inverted, is held with two time constants of long and short.
The short time-constant bottom hold is done for a disc mirror defect more than 0.1msec, the long time-
constant bottom hold is done with the mirror level prior to the defect. By differentiating this with a
capacitor coupling and shifting the level, both signals are compared to generate the mirror defect
detection signal.
DCC1 DCC2
5 4
75K
37.5K
RFO 75 - BOTTOM
28K
+ HOLD
75K
BOTTOM - DFCT
VC+0.6254V 43K 41 SSTOP/DFCT
HOLD
+
2
DCB
Figure 10. Defect Circuit
1.8 APC (Auto Power Control) Circuit
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 photo diode, must be a
controlled current for getting regular output power, thus the APC (Auto Power Control) circuit is
composed.
PN (From micom command)
150K
PD 69 + + 0.75K
43.5K 70 LD
- 150K
-
300K
150K
5.5K
1.25V
LDON (From micom command)
Figure 11. APC Circuit
14
FL8370
2.Servo Block
2.1 Focus Servo Block
When defect is "H"(the defect signal is detected), the focus servo loop is muting in case of focus phase
compensation. At this time, the focus error signal is outputted through the low pass filter formed by
connecting a capacitor(0.1uF) and a built-in 470K resistor to the FDFCT pin(pin 60). Accordingly, the
focus error output is held at the error value just before defect error during defect occurring. The peak
frequency of focus loop phase compensation is at about 1.2KHz when the resistor connected to FSET
pin(pin 6) is 510K, and it is inversely proportional to the resistor connected to the FSET pin. While the
focus search is operating, the FS4 switch is on and then the focus error signal is isolated, accordingly the
focus search signal is outputted by FEO pin(pin 48). When the FS2 switch is on(focus on), the focus
servo loop is on and the focus error signal from FE2 pin(pin 58) is outputted through the focus servo loop.
3.6K VC
- FSCMPO
+
60K
- FZCI
+
- 48
FEO
+
FE2 20K 92K X4 X3 X2
58 48K Focus Phase X1
470K Compensation
60
-
FDFCT
40K
+
FS4B
130K FS2B
FE-
47
DFCTI 10K
470K
FGD 40K 50K
28
3.6K PS
- 4 3
27 FS1
FS3 46K X1 0 0
+
580K
FS3 X2 0 1
X3 1 0
X4 1 1
26 6 3
FLB FSET FRCH
Figure 15. Focus servo block
15
FL8370
2.2 Tracking Servo Block
During detection of defect, the tracking error signal is outputted through the tracking servo loop after
passing the low pass filter formed by connecting a capacitor(0.1uF) and a built-in 470K resistor to the
TDFCT pin(pin57) in case of tracking phase compensation. The value of tracking gain up/down can be
controlled by TGU and TG2 pin. The peak frequency of tracking loop phase compensation, the dynamic
range and offset of opamp can be adjusted by changing the value of resistor connected to FSET pin
same as focus loop. In case of unstable status of actuator after jumping, the ON/OFF of tracking loop is
controlled by TM7 switch of break circuit.
After 10-track jumping, servo circuit gets out of the liner range and actuator's tracking becomes
occasionally unstable. Hence unnecessary jumping with many tracking error should be prevented.
TE2 TM4
53
470K TE-
49
680K 680K
57 TM3
TDFCT
TG1 TG1
DFCTI 10K
66PF
TM1
TGU 110K TRACKING 10K 90K
20K PHASE - TEO
61 COMPENSATION 50
TG2 +
82K TM7
62
TG2
470K
6
FSET
Figure 16. Tracking servo block
16
FL8370
2.3 Sled Servo Block
The moving of pick-up is controlled by tracking servo output through a low pass filter.
The sled kick voltage is outputted for track jump operation.
SLO
43
TM6
TM7
SL-
- 44
PS SL+
+ 42
4 3
X1 0 0 TM2
X2 0 1
X3 1 0
X4 1 1
Figure 17. Sled servo block
2.4 Spindle Servo Block
The 20K resistor and 0.33uF capacitor form the 200Hz low pass filter, and the carrier component of
spindle servo error signals is eliminated. In CLV-S mode, SMEF becomes "L" and pin 25 low pass filter fc
lowers, strengthening the filter further. The characteristics of high frequency phase compensation in
focus tracking servo and the characteristics of cut off frequency in CLV low pass filter are tested by FSET
pin.
22K 22K
SMON 24
220K
15K
220K 100K +
- 46 SPDLO
20K -
SMDP 23 + 50K
220K
15K 220K Double
speed
45 SPDL-
25 6
SMEF FSET
Figure 18. Spindle servo block
17
FL8370
KB9223
RF AMP & SERVO SIGNAL PROCESSOR
OVERVIEW
80-QFP-1420C
The KB9223 is a 1-chip BICMOS integrated circuit to per-
form the function of RF amp and servo signal processor for
compact disc player applications.It consist of blocks for RF
signal processing ,focus, tracking, sled and spindle
servo.Also this IC has adjustment free function and embed-
ded opamp for audio post filter.
FEATURES