Harman Kardon AVR 300 User manual

harman/kardon
AVR300
A/V DOLBY DIGITAL RECEIVER
SERVICE MANUAL
CONTENTS
SPECIFICATIONS…………………..…….…..2
ESD WARNING…………………..….……… .4
LEAKAGE TESTING………………...….…....5
CONTROLS AND FUNCTIONS….…….…. .6
SERVICE PROCEDURE……………..….…..9
ALIGNMENT PROCEDURE…………….… .9
IDLE CURRENT/DC OFFSET..…………….10
ALIGNMENT/TEST POINTS………..….…. 11
CIRCUIT DESCRIPTION……………….…. 13
BLOCK DIAGRAM……………………… …16
BULLETIN HK2000-05…………..…...…. …17
BULLETIN HK2000-02 Rev1…..………..….18
DISASSEMBLY PROCEDURE…..……...…21
UNIT EXPLODED VIEW………………..…..22
MECHANICAL PARTS LIST…………..……23
PCB DRAWINGS……………………………25
ELECTRICAL PARTS LIST……………..….30
INTEGRATED CIRCUIT DRAWINGS…..…52
SCHEMATICS………………….…..……..…80
SEMICONDUCTOR PINOUTS………….…89
WIRING DIAGRAM…………………….…...90
PACKAGE………………………………..…..91
harman/kardon, Inc.
250 Crossways Park Dr.
Woodbury, New York 11797 Rev0 – 6/2002

Each precaution in this manual should be followed during servicing.
Components identified with the IEC symbol in the parts list are special significance to safety. When replacing a component identified with
, use only the replacement parts designated, or parts with the same ratings or resistance, wattage, or voltage that are designated in the
parts list in this manual. Leakage-current or resistance measurements must be made to determine that exposed parts are acceptably
insulated from the supply circuit before retuming the product to the customer.
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and
semiconductor "chip" components.
The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on
your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to
prevent electrostatic charge build-up or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges
sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical change sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement
ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material.)
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the
chassis or circuit assembly into which the device will be installed.
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together
or your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES devices.
CAUTION :
-4-
300

1. lnspect all lead dress to make certain that
leads are not pinched or that hardware is not
lodged between the chassis and other metal
parts in the unit.
2. Be sure that any protective devices such as
nonmetallic control knobs, insulating fish-
papers, cabinet backs, adjustment and
compartment covers or shields, isolation
resistor-capacity networks, mechanical
insulators, etc. Which were removed for the
servicing are properly re-installed.
Before returning the unit to the user, perform the following safety checks :
3. Be sure that no shock hazard exists ; check for leakage
current using Simpson Model 229 Leakage Tester, standard
equipment item No. 21641, RCA Model WT540A or use
alternate method as follows : Plug the power cord directly
Into a 120 volt AC receptacle (do not use an Isolation
Transformer for this test). Using two clip leads, connect a
1500 ohms, 10watt Resistor paralleled by a 0.15uF capacitor, in series with all exposed metal cabinet parts and a known earth ground, such
as a water pipe or conduit. Use a VTVM or VOM with 1000 ohms per volt, or higher sensitivity to measure the AC voltage drop across the
resistor. (See diagram) Move the resistor connection to each exposed metal part having a return path to the chassis (antenna, metal, be
performed with the 0.35 volt RMS or more is excessive and indicates a potential shock hazard which must be corrected before returning the
unit to the owner.
-5-
300

AVR300

SERVICE PROCEDURE
TEST EQUIPMENT REQUIRED
1) AM/FM Signal generator
2) Digital Multimeter
3) Distortion lever meter
2. VFD segment illumination & text
This set do not have VFD segment check function because lack of u-com memory size
So For your checking VFD states according to each function
Please refer to owners manual process.
1. All Clear
This service program can clear all memorized operations and functions.
When the POWER ON, press the "AM/FM" button while pressing the "PRO LOGIC"button.
After this, Preset memory will be set to these frequencies.
FM
AM
VERSION
120
230RDS
VERSION
120
230RDS
P1
87.5
87.50
P9
520
522
P2
88.0
88.00
P10
600
594
P3
90.0
90.00
P11
610
999
P4
95.0
95.00
P12
1000
1395
P5
98.0
98.00
P13
1400
1611
P6
99.0
99.00
P14
1500
P7
106.0
106.00
P15
1710
P8
108.0
108.00
ALIGNMENT PROCEDURES
1. FM MONO. Distortion adjustment
step
1
2
Input Signal Source
Connection
Signal generator
output to FM
antenna
terminal.(750hm)
Signal
Frequency
98MHz
Source Signal Output Level and
Modulation
1000uV/m (60dBu)
MONO 1kHz/
Dev. 75kHz
Reception
Frequency
98MHz
(P5)
Adjustment
Point
T804
T805
Adjustment
Value
0mV 0.5mV
(R831)
Distortion
level
at
TAPE-OUT
Minimum
4. FM STEREO Separation Adjustment
step
1
2
Input Signal Source
Connection
Signal generator
output to FM
antenna
terminal.(750hm)
Signal
Frequency
98MHz
Source Signal Output Level and
Modulation
same specification as
distortion adjustment.
Input only L channel
FM STEREO
same specification as
distortion adjustment.
Input only R channel
FM STEREO
Reception
Frequency
98MHz
(P5)
98MHz
(P5)
Adjustment
Point
VR803
VR803
Adjustment
Value
Output level
at TAPE-OUT
channel R
Minimum
Output level
at TAPE-OUT
channel R
Minimum
2. FM MUTING LEVEL ADJUSTMENT
Turn variable resistor VR801 and stop at position "TUNED" is not shown (not indicated), then again turn the variable resistor VR801 to the
opposite revolution and stop at a position "TUNED" is shown.
step
1
2
Input Signal Source
Connection
Signal generator
output to FM
antenna
terminal.(750hm)
Signal
Frequency
98MHz
Source Signal Output Level and
Modulation
10uV/m (20dBu)
MONO 1kHz/
Dev. 75kHz
Reception
Frequency
98MHz
(P5)
AUTO
SCAN
Adjustment
Point
VR801
Only confirm
Adjustment
Value
"TUNED"
indicate on VFD
"TUNED"
indicate on VFD
-9-
2
step Input Signal Source
Connection
Signal
Frequency
Source Signal Output Level and
Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
1395kHz
(230,230RDS)
1400kHz(120)
CT801
5. AM-Tracking Adjustment (MW)
Signal Generator
output to transmission
loop antenna
(standard required loop)
5mV/m(74dBu)
400Hz
MOD.30%
594kHz
(230,230RDS)
600kHz(120)
594kHz
(230,230RDS)
600kHz(120)
T801
Output level(L or R)
at
TAPE-OUT
Minimum
Output level(L or R)
at
TAPE-OUT
Minimum
6. AM IF Adjustment
step Input Signal Source
Connection
Signal
Frequency
Source Signal Output Level and
Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
T803
Output level(L or R)
at
TAPE-OUT
Maximum
Signal Generator
output to transmission
loop antenna
(standard required loop)
5mV/m(74dBu)
400Hz
MOD.30%
999kHz
(230,230RDS)
1000kHz
(120)
999kHz
(230,230RDS)
1000kHz(120) Output level(L or R)
at
TAPE-OUT
Maximum
1
step Input Signal Source
Connection
Signal
Frequency
Source Signal Output Level and
Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
522kHz
(230,230RDS)
520kHz(120)
5mV/m(74dBu)
400Hz
MOD.30%
Signal Generator
output to transmission
loop antenna
(standard required loop)
522kHz
(230,230RDS)
520kHz
(120)
(P9)
T802 1.1V 1.2V
4. AM OSC Adujstment
300

2
step Input Signal Source
Connection
Signal
Frequency
Source Signal Output Level and
Modulation
Reception
Frequency
Adjustment
Point
Adjustment
Value
1
7. AM auto stop Adjustment
Signal Generator
output to transmission
loop antenna
(standard required loop)
1000uV/m(60dBu)
400Hz
MOD.30%
AUTO SCAN
"TUNED"
indicate on
VFD
999kHz
(230,230RDS)
1000kHz
(120)
999kHz
(230,230RDS)
1000kHz(120)
Only
Confirm
VR802
"TUNED"
indicate on
VFD
8. Main Amp ldling current Adjustment
(4) CAUTION
should be adjusted again
* FRONT AMP : Q433~Q440
* CENTER AMP : Q517~Q520
* SURROUND AMP : Q633~Q640
1) In case that POWER TR or DREVE TR is needed to be replaced for repairing, the corresponding channel
(1) SET CONDITION
1) SEMI VOLUME POSITION at MAIN/SURROUND AMP Board; CENTER
MAIN : VR401, VR402, VR501
SURROUND : VR601, VR602
2) NO signal / NO LOAD
3) AC LINE VOLTAGE : 120V/60Hz, 230V/50Hz
(2) After turning on the unit, keep it over than 5MIN. (Keep the Power/Drive TR as normal temperature)
(3) Adjust the voltage value of primary & secondary of wafer to be 10mV by rotating the semi-volume
of each channel to the right
R401:22.7mA
R472:22.7mA
R501:22.7mA
R601:22.7mA
R602:22.7mA
FRONT-L ch
FRONT-R ch
CENTER ch
SURROUND-L ch
SURROUND-R ch
VR401
VR402
VR501
VR601
VR602
WA401
WA402
WA501
WA601
WA602
CHANNEL ADJUSTMENT MEASUREMENT OTHERS
-10-
10 3mV
10 3mV
10 3mV
10 3mV
10 3mV
VOLAGE
9. Main Amp DC OFFSET VOLTAGE Adjustment
(4) CAUTION
should be adjusted again
* FRONT AMP : Q401~Q440, Q411~Q414
* CENTER AMP : Q501, Q502, Q506, Q507
* SURROUND AMP : Q601~Q604, Q611~Q614
1) In case that POWER TR or DREVE TR is needed to be replaced for repairing, the corresponding channel
(1) SET CONDITION
1) SEMI VOLUME POSITION at MAIN/SURROUND AMP Board; CENTER
MAIN : VR403, VR404, VR502
SURROUND : VR603, VR604
2) NO signal / NO LOAD
3) AC LINE VOLTAGE : 120V/60Hz, 230V/50Hz
(2) After turning on the unit, keep it over than 5MIN. (Keep the Power/Drive TR as normal temperature)
(3) Adjust the voltage value of primary & secondary of wafer to be 10mV by rotating the semi-volume
of each channel to the right
FRONT-L ch
FRONT-R ch
CENTER ch
SURROUND-L ch
SURROUND-R ch
VR403
VR404
VR502
VR603
Vr604
JK401
JK402
JK501
JK601
JK601
CHANNEL ADJUSTMENT MEASUREMENT OTHERS
0mV
0mV
0mV
0mV
0mV
VOLAGE
10. Cautions for main Amp adjustment
(1) At MAIN/SURROUND BOARD, use the below condensors after discharging for sufficent time
for preventing possible damage from electrical spark.
(2) The checker for MAIN/SURROUND BOARD should have the discharging circuit.
Discharge over 30sec. through (407ohm 10w) resistor after turning off
MAIN BOARD C481, C482 (10000/63V, 8200uF/63V)
SURROUND BOARD C691, C692 (6800/63V, 6800uF/50V)
300

harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 [phone]
harman/kardon Service Bulletin
Service bulletin # H/K2000-05 May 2000 Warranty labor rate: MAJOR repair
To: All harman/kardon Service Centers
Models: AVR300, AVR500
Subject: Volume Level Changes
On early versions of the AVR300 or AVR500 the volume level may change by itself, or when the volume knob
is tapped. This may happen on an occasional random basis and depends on where the volume control knob is
positioned after a volume adjustment. During a running production change, new volume encoders were
installed.
In the event you receive an AVR300 or AVR500 with the complaint “The volume on my receiver
changes by itself”, perform the following procedure:
REPLACE VR901 VOLUME ENCODER
1) Remove the top cover, (14) Black Phillips screws.
2) Remove the (11) Black Phillips screws holding the plastic front panel to the chassis.
3) Remove the single Phillips screw on both right & left side of the chassis with a dual black ground wire.
4) Remove the volume, bass, treble and balance knobs by pulling them straight off.
5) Remove the single nut holding the volume encoder to the front panel.
6) Pull the loaded front panel off the chassis; cut any plastic cable ties necessary to fully disengage it
7) Lift and set the receiver on its right side for the remainder of the procedure.
8) Remove molex connector CN983 at the power switch; see Figure 1.
9) Pull the front panel as far away as the remaining connecting wires will allow.
10) Unsolder the connections at the rear of the front PCB to the volume encoder.
11) Using a “stubby” Phillips screwdriver, remove the (19) Black Phillips screws holding the front PCB to the
front panel; two plated screws at the rear of the headphone jack also must be removed.
12) Pull the front PCB away from the front panel.
13) Remove and replace the volume encoder with h/k part# J32612050102; resolder the new encoder in place.
14) Replace the front PCB and reassemble the receiver in reverse order, following the instructions above.
Replace all cable ties that were cut, and reattach any connectors that were unplugged. Make sure the two
ground wires on both sides of the receiver are reattached.
15) Power up receiver, and test volume control to assure it no longer changes settings by itself, or when the
volume knob is tapped.

harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 [phone]
harman/kardon Service Bulletin
Service bulletin # H/K2000-02 Rev1 January 2001 Warranty labor rate: MAJOR repair
To: All harman/kardon Service Centers
Models: AVR300, AVR500
Subject: Random Noise, Erratic Output in DTS Mode
In the event you receive an AVR300 or AVR500 receiver with the complaint “there is distortion, random
noise or gaps in the program material when in the DTS mode”, perform the following procedure:
REMOVAL AND MODIFICATION OF THE DSP BOARD
1) Remove the top cover, (14) Black Phillips screws.
2) Locate the DSP PC Board; Figure 1. Remove the two metal braces at the top of the unit. If necessary, cut
the cable ties attached to the braces to move any wires away from the area.
3) Pull the white 22 conductor ribbon cable at the rear of the DSP PC Board straight out of its receptacle.
4) Unplug the white 5 conductor molex cable at the top of the DSP PC Board.
5) Remove the (33) plated Phillips screws on the left side of the rear backplate; see Figure 2. Do not remove
any additional screws on the right side. If using a power tool, use care and minimum effort to avoid damaging
the various plastic receptacles.
6) Remove all three black plastic plugs that cover the optical inputs at the rear of the DSP PC Board.
7) Pull on the left side of the rear backplate, away from the receiver chassis; you should be able to pull it away
enough to allow the DSP PC Board to be pulled straight up and out of the receiver.
8) Proceed with the modifications on page 2.
Model Serial Number
120V
Serial Number
230V RDS STATUS ACTION
AVR300
AVR500
TH0001-01000
To
TH0001-13886
TH0002-01000
To
TH0002-10460
TH0005-01000
To
TH0005-03317
TH0006-01000
To
TH0006-02795
Random Noise, Erratic
Output or Gaps in Program
Material when in DTS Mode
Modifications to DSP Board:
Add ground wire;
Change R756 & R755
from 600Wresistor or Capacitor
to 33Wresistor
AVR300
AVR500
TH0001-13887
Or higher
TH0002-10461
Or higher
TH0005-03318
Or higher
TH0006-02796
Or higher
Modified by factory NONE REQUIRED

harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 [phone]
Models: AVR300, AVR500 Subject: Random Noise, Erratic Output in DTS Mode
9) Ground Reinforcement:
Using an insulated 16AWG wire, Connect Negative sides of the following capacitors on the bottom side of the
PCB as shown below. Negative side of each cap will have a white mark on the component side of the PCB.
A. Negative polarity of C746 Elec Cap (1uF/50V) in the proximity of ROM IC709
B. Negative polarity of C749 Elec Cap (1uF/50V) in the proximity of IC708 DSP IC
C. Negative polarity of C744 Elec Cap (1uF/50V) in the proximity of IC710 74VHC574
C B A
10) Replace:
R756 & R755. Original parts may be 600Wresistors, or Capacitors. Change both to 33W1/10W
SMD resistors (h/k part# 292-33.2). See location below.
11) Replace DSP PC Board back into its (3) receptacle plugs atop the MAIN PCB.
12) Replace all screws, braces, and any cable ties that were cut during disassembly. Before tightening the
screws, make sure all PCB’s and their RCA jacks are firmly seated in their respective holes in the rear
backplate. If using a power tool, use care and minimum effort to avoid damaging the various plastic
receptacles.
13) Plug both the 22 conductor ribbon cable and the 5 conductor molex cable back into their receptacles.
14) Replace the top cover and optical plugs.
15) Test unit by powering up the receiver and playing a source with DTS encoded material; confirm the complaint
of Random Noise or Erratic Output is no longer occurring.

harman/kardon Incorporated 250 Crossways Park Drive, Woodbury New York 11797 [phone]
Models: AVR300, AVR500 Subject: Volume Level Changes
Model Serial Number
120V
Serial Number
230V RDS STATUS ACTION
AVR300
AVR500
TH0001-01000
To
TH0001-08402
TH0002-01000
To
TH0002-05565
TH0005-01000
To
TH0005-01001
TH0006-01000
To
TH0006-01001
Volume level changes by
itself or when volume
knob is tapped
Change VR901
Rotary encoder
AVR300
AVR500
TH0001-08403
Or higher
TH0002-05566
Or higher
TH0005-01002
Or higher
TH0006-01002
Or higher
Modified by factory NONE REQUIRED