300
7. AM auto stop Adjustment
9. Main Amp DC OFFSET VOLTAGE Adjustment
Input Signal SourceSignalSource Signal Output Level andReceptionAdjustmentAdjustment
step
ConnectionFrequencyModulationFrequencyPointValue(1) SET CONDITION
1) SEMI VOLUME POSITION at MAIN/SURROUND AMP Board; CENTER
999kHz"TUNED"
MAIN: VR403, VR404, VR502
1Signal Generator999kHz(230,230RDS)VR802indicate on
1000uV/m(60dBu)1000kHz(120)VFDSURROUND : VR603, VR604
output to transmission(230,230RDS)
loop antenna400Hz1000kHz2) NO signal / NO LOAD
MOD.30%"TUNED"
(standard required loop)(120)Only
2AUTO SCANindicate onConfirm3) AC LINE VOLTAGE : 120V/60Hz, 230V/50Hz
VFD
(2) After turning on the unit, keep it over than 5MIN. (Keep the Power/Drive TR as normal temperature)
8. Main Amp ldling current Adjustment(3) Adjust the voltage value of primary & secondary of wafer to be 10mV by rotating the semi-volume
of each channel to the right
(1) SET CONDITION
CHANNELADJUSTMENTMEASUREMENTVOLAGEOTHERS
1) SEMI VOLUME POSITION at MAIN/SURROUND AMP Board; CENTER
MAIN: VR401, VR402, VR501FRONT-L chVR403JK4010mV
FRONT-R chVR404JK402
SURROUND : VR601, VR6020mV
2) NO signal / NO LOADCENTER chVR502JK5010mV
3) AC LINE VOLTAGE : 120V/60Hz, 230V/50HzSURROUND-L chVR603JK6010mV
SURROUND-R chVr604JK6010mV
(2) After turning on the unit, keep it over than 5MIN. (Keep the Power/Drive TR as normal temperature)
(4) CAUTION
1) In case that POWER TR or DREVE TR is needed to be replaced for repairing, the corresponding channel
(3) Adjust the voltage value of primary & secondary of wafer to be 10mV by rotating the semi-volume
should be adjusted again
of each channel to the right
* FRONT AMP: Q401~Q440, Q411~Q414
* CENTER AMP: Q501, Q502, Q506, Q507
CHANNELADJUSTMENTMEASUREMENTVOLAGEOTHERS* SURROUND AMP : Q601~Q604, Q611~Q614
FRONT-L chVR401WA40110 3mVR401:22.7mA
FRONT-R chVR402WA40210 3mVR472:22.7mA
10. Cautions for main Amp adjustment
CENTER chVR501WA50110 3mVR501:22.7mA
SURROUND-L chVR601WA60110 3mVR601:22.7mA
(1) At MAIN/SURROUND BOARD, use the below condensors after discharging for sufficent time
SURROUND-R chVR602WA60210 3mVR602:22.7mA
for preventing possible damage from electrical spark.
MAIN BOARDC481, C482 (10000/63V, 8200uF/63V)
(4) CAUTION
SURROUND BOARDC691, C692 (6800/63V, 6800uF/50V)
1) In case that POWER TR or DREVE TR is needed to be replaced for repairing, the corresponding channel
should be adjusted again
* FRONT AMP: Q433~Q440
* CENTER AMP: Q517~Q520(2) The checker for MAIN/SURROUND BOARD should have the discharging circuit.
Discharge over 30sec. through (407ohm 10w) resistor after turning off
* SURROUND AMP : Q633~Q640
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ACEC
