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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 16 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 a8-13 pins)
becomes 5.80 ± 0.05 V.
Then, confirm that each line voltage is within the
following range.
5.8 V line (CN201 a8-13 pins)
4.1 V line (CN201 a3-7 pins)
5.0 V line (CN201 a14, 15 pins)
12 V line (CN201 a1, 2 pins)
The load mode is the MIN.
LDU-1530/1540
SECTION 2
CIRCUIT ADJUSTMENTS
G Board (APS-102)
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
5.75 ~ 5.80 V
3.95 ~ 4.35 V
4.80 ~ 5.20 V
9.8 ~ 12.4 V
RV103
Lowest Frequency
Adjustment
1
16
8
9
IC103
C111
RV101
Power Factor
Improvement Voltege
Q105
Adjustment
17 ±0.05V
GND
IC2001
CN2003
RV201
Output Voltage
Adjustment
a
b
1
CN201
15
RV2001
PLL
Adjustment
TP2001
TP2002
(GND)
2-1(E)
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