Harman Kardon AVR430 Service Manual page 22

AVR430/630
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.
CHANNEL
FRONT L CHAN
FRONT R CHAN
SURROUND L CHAN
SURROUND R CHAN
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
CHANNEL
CENTER
SURROND BACK L
SURROND BACK R
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.
SERIAL NUMBER (120V)
MODEL
TF0001-01000
AVR430
TF0001-08116
TF0007-08117 and above
AVR430
TF0002-01000
AVR630
TF0002-11138
TF0002-11139 and above
AVR630
ADJUSTMENT
VR71
VR74
VR73
VR72
ADJUSTMENT
VR32
VR31
VR51
SERIAL NUMBER (230V)
TF0006-01000
to
TF0006-06663
TF0007-06664 and above
TF0007-01000
to
TF0007-05650
TF0007-05651 and above
MEASUREMENT POINT
P801
P804
P803
P802
MEASUREMENT POINT
P308
P301
P309
STATUS
Unit may shut down or fan
to
may run continuously
Modified by Factory
Unit may shut down or fan
to
may run continuously
Modified by Factory
22
harman/kardon
VOLTAGE
23mV ±2mV
23mV ±2mV
23mV ±2mV
23mV ±2mV
VOLTAGE
23mV ±2mV
23mV ±2mV
23mV ±2mV
ACTION
Hard wire bias cables
to PCB's
None Required
Hard wire bias cables
to PCB's
None Required