Read Harman Kardon AVR 630 Technical Bulletin online
harman/kardon, Incorporated
250 Crossways Park Dr. Woodbury, New York 11797
3
7) Replace the DSP and Processor boards
8) Recheck all bias voltages, following the instructions below:
MAIN AMP IDLE CURRENT ADJUSTMENT PROCEDURE
(Set variable resistors for MAIN/SURROUND Board)
Specialized equipment/parts needed:
Variable AC transformer (“Variac” type) to adjust and monitor AC line voltage.
Two pin harness plug to connect DMM to idle current test points, hk part# 55212910NR or equivalent
Conditions:
No Signal; No Load
AC Line Voltage adjust to: 120V/60Hz (120v model) or 230V/50Hz (230v model)
After turning the unit ON for 25 minutes or more to keep the Power/Driver TR at normal temperature,
adjust the DC voltage at the two pin connector to the specified value by rotating the variable resistors.
VR71-74 are located on the Bias PCB’s.
P801-804 are located on the main PCB just below the Bias PCB’s. To guide/seat the two pin harness plug
into the sockets, you may have to attach the harness wire to a long blade screwdriver as P801-803 are in
a deep recess.
8) Recheck all bias voltages, following the instructions below:
MAIN AMP IDLE CURRENT ADJUSTMENT PROCEDURE
(Set variable resistors for MAIN/SURROUND Board)
Specialized equipment/parts needed:
Variable AC transformer (“Variac” type) to adjust and monitor AC line voltage.
Two pin harness plug to connect DMM to idle current test points, hk part# 55212910NR or equivalent
Conditions:
No Signal; No Load
AC Line Voltage adjust to: 120V/60Hz (120v model) or 230V/50Hz (230v model)
After turning the unit ON for 25 minutes or more to keep the Power/Driver TR at normal temperature,
adjust the DC voltage at the two pin connector to the specified value by rotating the variable resistors.
VR71-74 are located on the Bias PCB’s.
P801-804 are located on the main PCB just below the Bias PCB’s. To guide/seat the two pin harness plug
into the sockets, you may have to attach the harness wire to a long blade screwdriver as P801-803 are in
a deep recess.
CHANNEL
ADJUSTMENT
MEASUREMENT POINT
VOLTAGE
FRONT L CHAN
VR71
P801
23mV ±2mV
FRONT R CHAN
VR74
P804
23mV ±2mV
SURROUND L CHAN
VR73
P803
23mV ±2mV
SURROUND R CHAN
VR72
P802
23mV ±2mV
SURROUND BACK AMP IDLE CURRENT ADJUSTMENT PROCEDURE
Same conditions as above.
After turning the unit ON for 25 minutes or more to keep the Power/Driver TR at normal temperature,
adjust the voltage value at the two pin connector to the specified value by rotating the variable resistors.
VR31,32,51 and P301,308,309 are located at the top edge of the Surround PCB
adjust the voltage value at the two pin connector to the specified value by rotating the variable resistors.
VR31,32,51 and P301,308,309 are located at the top edge of the Surround PCB
CHANNEL
ADJUSTMENT
MEASUREMENT POINT
VOLTAGE
CENTER
VR32
P308
23mV ±2mV
SURROND BACK L
VR31
P301
23mV ±2mV
SURROND BACK R
VR51
P309
23mV ±2mV
9) After 5 minutes, check all voltages again at measurement points and re-adjust if necessary.
10) After more 5 minutes, check all voltages again at measurement points and re-adjust if necessary.
11) Replace the top cover and test the unit.
MODEL
SERIAL NUMBER (120V)
SERIAL NUMBER (230V)
STATUS
ACTION
AVR430
TF0001-01000
to
TF0001-08116
TF0006-01000
to
TF0006-06663
Unit may shut down or fan
may run continuously
Hard wire bias cables
to PCB’s
AVR430
TF0007-08117 and above
TF0007-06664 and above
Modified by Factory
None Required
AVR630
TF0002-01000
to
TF0002-11138
TF0007-01000
to
TF0007-05650
Unit may shut down or fan
may run continuously
Hard wire bias cables
to PCB’s
AVR630
TF0002-11139 and above
TF0007-05651 and above
Modified by Factory
None Required
