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[Measuring instrument]
1. Oscilloscope
2. Digital tester
3. DC power supply
G Board Adjustments
2-1. Lowest Frequency Adjustment
(RV103)
Apply 18 V between 4 pin (VIN) and !; pin (GND) of
IC103, and check the Q105 gate input waveform with an
oscilloscope.
Then, adjust the frequency of gate waveform to 100 kHz
± 2 kHz with the RV103. (Set oscilloscope to 5 V range)
100 kHz ±2 kHz
*Don't turn on Power supply AC.
2-2. Power Factor Improvement (PFC)
Voltage Adjustment (RV101)
Power supply AC100 to 240 V, and adjust RV101 so that
the voltage at both ends of C111 becomes 380 ±5 V. The
load mode is the MIN.
2-3. Output Voltage Adjustment (RV201)
Power supply AC100 to 240 V, and adjust RV201 so that
the output voltage of 5.8 V line (CN201 a8 to ![ pins)
becomes 5.80 ±0.05 V.
Then, confirm that each line voltage is within the follow-
ing range.
5.8 V line (CN201 a8 to ![ pins) 5.75 to 5.80 V
4.1 V line (CN201 a3 to 7 pins) 3.95 to 4.35 V
5.0 V line (CN201 a!], !\ pins)
12 V line (CN201 a1, 2 pins)
The load mode is the MIN.
LDU-1530/1540/1515
Section 2
Electrical Adjustments
G Board (APS-102)
C111
Q board adjustment
2-4. PLL Adjustment (RV2001)
Power supply AC100 to 240 V, connect the oscilloscope
with TP2001 and adjust RV2001 so that the center of
waveform becomes 1.7 ± 0.05.
Q Board
4.80 to 5.20 V
9.8 to 12.4 V
CN2003
RV103
Lowest Frequency
Adjustment
1
16
8
9
IC103
RV101
Power Factor
Improvement Voltege
Q105
Adjustment
±
1.7
0.05V
GND
IC2001
TP2001
RV201
Output Voltage
Adjustment
a
b
1
CN201
15
RV2001
PLL
Adjustment
TP2002
(GND)
2-1 (E)
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