SERVICE PROCEDURE
ALIGNMENT PROCEDURES
1.MAIN AMP idling Adjustment
SET CONDITION
1) SEMI VOLUME POSITION at MAIN/SURROUND AMP Board
MAIN:VR101,VR102,VR103,VR104
SURROUND:VR501,VR601,VR701
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 ADJUSTMENT MEASUREMENT VOLTAGE
FRONT-L CH VR104 P114 23+/-2mV
FRONT-R CH VR101 P111 23+/-2mV
SURROUND-L CH VR103 P113 23+/-2mV
SURROUND-R CH VR102 P112 23+/-2mV
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:Q437.Q333.Q335.Q439.Q438.Q334.Q336.Q440
SURROUND AMP:Q618.Q619.Q518.Q519.Q718.Q719
2.SURROUND BACK AMP idling Adjustment
SET CONDITION
1) SEMI VOLUME POSITION at CENTER/SURROUND BACK AMP Board
CENTER:VR501
SURROUND BACK:VR601.VR701
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 ADJUSTMENT MEASUREMENT VOLTAGE
CENTER VR501 P501 23+/-2mV
SURR BACK-L CH VR601 P601 23+/-2mV
SURR BACK-R CH VR701 P701 23+/-2mV
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:Q519,Q517.Q516,Q518
SUR BACK AMP:Q618.Q617.Q618.Q619.Q716.Q717.Q718.Q719
3.Cautions for main adjustment
1) At MAIN/SUPPLY BOARD.use the below capacitor after discharging for sufficent time for preventing
possible damage from electrical spark
MAIN BOARD C151.C152 AVR7550HD 15000/63V
SUPPLY BOARD C3101,C3102 AVR7550HD 10000/63V
2)The checking for MAIN/SUPPLY BOARD should have the discharging circuit discharge
over 30sec.through(4R7Ohm 10W)resistor after push power sw off
AVR 7550HD harman/kardon
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