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)
500
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Audio Specifications
