DOWNLOAD Harman Kardon FL 8370 (serv.man3) Service Manual ↓ Size: 3.28 MB | Pages: 101 in PDF or view online for FREE

Model
FL 8370 (serv.man3)
Pages
101
Size
3.28 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
fl-8370-sm3.pdf
Date

Harman Kardon FL 8370 (serv.man3) Service Manual ▷ View online

 
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FL8370
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.
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).
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
65
66
-
+
-
+
74
-
+
73
PD1
PD2
RFO
RF-
58K
10K
VA
I-V amp(1)
VC
58K
10K
VB
I-V amp(2)
VC
VC
RF summing amp
63
-
+
59
-
+
-
+
sev-stopb
FEBIAS
sev-stop
32K
32K
<5 Bit Counter>
3K
X1
X2
X4
X8
X16
164K
FE1
160K
4K
fcmpo
vc
FEBIAS
fe-stopb
SW1
VB >
VA >
fe-stopb
11
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