Service Procedure - Harman Kardon AVR430 Service Manual

AVR430/AVR630

SERVICE PROCEDURE

ALIGNMENT PROCEDURES
1.MAIN AMP idling Adjustment
SET CONDITION
1) SEMI VOLUME POSITION at MAIN/SURROUND AMP Board
MAIN:VR71.VR74
SURROUND:VR72.VR73
NO Signal/No Load
AC Line Voltage:120V/60Hz.230V/50Hz
2) After turning on the unit keep it over than 25min (keep the power/Driver TR as normal temperature)
3) Adjust the voltage value of primary&secondary of wafer to be 25mV by rotating the semi volume of each channel
to the right
CHANNEL
FRONT-L CH
FRONT-R CH
SURROUNT-L CH
SURROUNT-R CH
4) CAUTION
In case that power TR or DRIVER TR is needed to be replace for repairing the corresponding channel should be
adjusted again
FRONT AMP:Q433.Q435.Q437.Q439.Q330.Q332.Q334.Q336
SURROUND AMP:Q434.Q436.Q438.Q440.Q329.Q331.Q333.Q335
2.SURROUND BACK AMP idling Adjustment
SET CONDITION
1) SEMI VOLUME POSITION at CENTER/SURROUND BACK AMP Board
CENTER:VR32
SURROUND BACK:VR31.VR51
NO Signal/No Load
AC Line Voltage:120V/60Hz.230V/50Hz
2) After turning on the unit keep it over than 25min (keep the power/Driver TR as normal temperature)
3) Adjust the voltage value of primary&secondary of wafer to be 25mV by rotating the semi volume of each channel
to the right
CHANNEL
CENTER
SUR BACK-L CH
SUR BACK-R CH
4) CAUTION
In case that power TR or DVIER TR is needed to be replace for repairing the corresponding channel should be adjusted
again
CENTER AMP:Q416Q417.Q418.Q419
SUR BACK AMP:Q316.Q317.Q318.Q319.Q516.Q517.Q518.Q519
3.Cautions for main adjustment
1) At MAIN/SURROUND BACK BOARD.use the below capacitor after discharging for sufficent time for preventing possible
damage from electrical spark
MAIN
BOARD
SUR BACK
CENTER BOARD
2)The checking for MAIN/SURR-BACK BOARD should have the discharging circuit discharge
over 30sec.through(4R7Ohm 10W)resistor after push power sw off
ADJUSTMENT MEASUREMENT
VR-71 P801
VR-74 P804
VR-73 P803
VR-72 P802
ADJUSTMENT MEASUREMENT
VR-32 P308
VR-31 P301
VR-51 P309
C504.C505 AVR630 15000/63V
C571.C572 AVR430 12000/63V
C201.C202 AVR630 10000/63V
C201.C202 AVR430 8200/63V
VOLTAGE
23+/-2mV
23+/-2mV
23+/-2mV
23+/-2mV
.
VOLTAGE
23+/-2mV
23+/-2mV
23+/-2mV
.
17
harman/kardon