Harman Kardon FL 8380 (serv.man10) Service Manual ▷ View online
FL8380
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
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FL8380
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
FUNCTION DESCRIPTION
Tracking System
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
TBAL
from Pin 31. V
TBAL
varies with reference to the center voltage V
REF2
(=1.65 V)
within
±
0.5 V.
The tracking gain will change according to the type of disc. For normal disc or CDR disc,
V
GCTRL
is set to V
REF2
; for CDRW disc V
GCTRL
is set to V
REF2
- 0.75 V. At the same time, the
focus gain is changed too.
A
B
C
D
F
PDIC
E
32
31
28
21
30
23
25
24
GCTRL
To Focus System
TBAL
Subtraction
R10
TEN
C8
TEOUT
V
GCTRL
C2
C15
C5
R5
V
REF1
V
REF2
R15
R14
V
TBAL
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FL8380
Focus System
The focus error output of A, B, C and D are given to Pin 27. C4 is required for oscillation-
proof. 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
FBAL
from Pin 30. V
FBAL
varies with reference to the center voltage V
REF2
(=1.65 V) within
±
0.5 V.
The focus gain will change according to the type of disc. For normal disc or CDR disc,
V
GCTRL
is set to V
REF2
; for CDRW disc V
GCTRL
is set to V
REF2
- 0.75 V. At the same time, the
tracking gain is changed too.
A
B
C
D
F
PDIC
E
36
34
28
29
27
26
GCTRL
FBAL
Subtraction
R7
FEN
C4
FEOUT
V
GCTRL
C2
C3
R6
V
FBAL
35
33
3
5
C35
C47
R27
R21
R20
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FL8380
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