Harman Kardon AVR 85 (serv.man3) Service Manual ▷ View online
IV. TECHNICAL DESCRIPTION
This product is a “Dolby Digital (AC-3)” decoder. By connecting this product with a Dolby digital compatible component such
as a DVD player or DBS tuner, it will be capable of 5.1 CH (Front L/R, Rear L/R, Center and Sub-woofer) play.
This product is composed of approximately of 5 blocks including the AC-3 decoder & DAC block (P604), crossover block
(PC04), power supply block (P704), volume control block (PE04) and front key input block (PU04).
V. SIGNAL AND CIRCUIT DESCRIPTION
OPT/COAX (AC-3/PCM input)
This signal is based on an additional format for transmitting the AC-3 data through the conventional digital audio interface
(SPDIF). This SPDIF contains the compressed data for AC-3, instead of PCM Audio data. Similarly to the case of ROM data,
whether the data is audio or non-audio is identified according to the status in the signal. This signal can be output from a DVD
player, etc.
DAI (Digital Audio Interface) Receiver
This circuit extracts various clock and data signals from the signal input in the SPDIF format.
AC-3 Decoder DSP
This circuit generates the 6-channel data (Front L/R, Rear L/R, Center and LFE) based on the data output from the DAI, and
outputs the 6-channel data to the DAC as 3 sets of 2-channel data.
Crossover
This circuit consists of 100Hz HPF for each channel, 100Hz LPF for sub-woofer channel, and mixing for sub-woofer output.
Depending on the speaker mode setting, frequencies of this circuit will be changed.
2 1
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
2 2
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
AVR75/85 BLOCK DIAGRAM
PU54
CONNECT
PN54
H
G
F
F
G
H
E
D
C
B
A
A
B
C
D
E
L
M
K
J
I
L
M
I
J
K
AVR75/85
BLOCK DIAGRAM
AVR75/85 PAGE 22 - 3 of 4
AVR75/85 PAGE 22 - 1 of 4
AVR75/85 PAGE 22 - 4 of 4
AVR75/85 PAGE 22 - 2 of 4
AVR75/85
SPECIFICATIONS
Power Suppies
USA/Canada . . . . . . . . AC 120V, 60Hz
Europe . . . . . . . . . . . . AC 230V, 50Hz
Dimensions (W x H x D)
Inches: . . . . . . . . . . . . 17 ! x 6 * x 18"
mm . . . . . . . . . . . . . . 444 x 162 x 457mm
Weight (lbs/kgs) . . . . . . . . 34/15.4
These specifications are service target specs. Specifications and components are subject to
change without notice. Overall performance will be maintained or improved.
General Test Conditions
1
Test Methods
Test methods for Tuners and Amplifier.
CP-2101, C6102, C6104
2
Power Source
The amplifier shall be tested at the (Primary power supply) conditions shown
in table below.
Destination
Power Source
U
120 Volts RMS
±
1% 60 Hz
±
2%
N
230 Volts RMS
±
1% 50 Hz
±
2%
3
Tuner Measurements
The FM signal shall be 500uV (65dBf) with
±
75kHz
Deviation at 1000Hz and 50mV/m Loop injected with 30%
modulation at 400Hz for AM, unless otherwise specified.
TAPE OUT terminated with 47kohms load unless otherwise
specified.
4
Audio Measurements
All audio measurement shall be made with test signals injected into CD.
Inputs and output measured at SPEAKER outputs with 8ohms
±
1%
non-inductive resistor load, or at TAPE OUT with 10kohms
±
5%//1nF
±
5%
loads, unless otherwise specified.
5
Control Settings
Tone control
: Mechanical center position
Balance control
: Mechanical center position
Volume control
: According to CP-2101
SPK SETT
: ALL Large
ATT
: off
unless otherwise specified
AC-3 Section Setting
AC-3 Section Setting
Night Mode
: off
SPK SETT NO. 1 Front: Small, Center: Small, Surround: Small, Subw: ON
SPK SETT NO. 2 Front: Large, Center: Large, Surround: Large, Subw: ON
SPK SETT NO. 3 Front: Large, Center: Large, Surround: Small, Subw: OFF
6
Used Test Disc
Dolby AC-3 Demonstration & Test Laser Disc Ver. 1.0 (for AC-3 RF)
2 3
Harman Kardon
Dolby Digital Audio/Video Receiver
Audio Section Performance Specifications
Seq #
Test
Reference
Unit
Nominal
Limits
1
Continuous Power Output THD 0.09%
(L/C/R)
Front L/R both, Center Ch.
! FTC
! CP-2101 5 CD Input
5 Volume Max.
8
W
20Hz
W
80
]65
8
W
1kHz
80
]65
8
W
20kHz
80
]65
Continuous Power Output
Surround Ch. THD 0.7%
Both Channels Driven
! CP-2101 ! FTC
Surr.
Ch.
8
W
ü
ü
8
W
1kHz
75
]65
8
W
ü
ü
DIN 1% Power Output
Front Ch. 5 CD In
8
W
1kHz
85
]75
Dynamic Power Output
Front Ch.
! CP-2101
! CD IN
8
W
1kHz
ü
ü
4/2
W
1kHz
ü
ü
2
Power Bandwidth
THD 0.09% Front Ch.
! CP-2101 5 Volume: Max.
5 CD IN
8
W
32.5W
Hz
5~70k
10~60k
W
W
3
Total Harmonics Distortion
at 65W Output Front Ch.
5 THD
! FTC
! CP-2101
! Volume: Max.
Front L/R both, Center Ch.
5 CD IN MODE: STEREO
Surround L/R Ch.
Mode: PCM STEREO Service
SPK SETT NO. 2
FRONT Ch.
L/R/C
20Hz
%
0.03
*0.09
1kHz
0.01
20kHz
0.05
Surr. Ch.
40Hz
0.5
*0.7
1kHz
0.5
20kHz
0.5
Total Harmonics Distortion
at 0.25W Output Front Ch.
5 THD
! FTC
! CP-2101
! Volume: Max.
5 CD IN MODE: STEREO
20Hz
0.05
*0.09
1kHz
0.05
20kHz
0.05
4
Intermodulation Distortion
at 65W Output
Front channel at STEREO Mode
5 CP-2101 (SMPTE Method)
5 Volume: Max.
W
*0.09
8
W
0.03
W
Input Sensitivity for 1.0V Pre-Output
at CD IN Measured at 1kHz
Vol: Max, Mode: STEREO
Front L/R
mV
240
200~280
5
Difference of Input Sensitivity
at each source ch., at CD IN 1KHz
Front L/R
dB
ü
*1
6
Frequency Response at Output -3 dB
Mode: Stereo ref: 1KHz
Front L/R
Hz
10~70k
15~50k
7
Treble Action
(L, C, R)
10KHz
Boost
dB
10
7.5~12.5
Cut
10
Bass Action
(L, C, R, SW)
100Hz
(SW
40Hz)
Boost
10
7.5~12.5
Cut
10
8
Crosstalk (between Stereo Channels)
terminated by 1k V
5 without Hum & Noise
5 CP-2101
Input: CD
STEREO
100Hz
59
]50
1kHz
59
]50
10kHz
59
]50
2 4
Harman Kardon
Dolby Digital Audio/Video Receiver
AVR75/85
Click on the first or last page to see other AVR 85 (serv.man3) service manuals if exist.