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the diode is the VCC auxiliary power supply circuit diode. This diode is the diode on the
circuit of the VCC auxiliary power supply.
⚫ In the past, the switching power supply at the majority of problems, UC3844, MOS
tubes, voltage regulators, diode
4. Easy to damage the device
UC3844, voltage regulator, MOS tube
5. Device bit number and specifications
IC
U1=UC3844
MOS Tube
Q1=STFW3N150
5V Circuit
Resistor: R89=10Ω/1210
Capacitor: E16=100uf, E2=470uf
C3=100NF/0805, C57=1UF/0805
C21=1NF/0805
Diode: D2/D3=US1J
24V Circuit
Resistor: R132/R133=10Ω/2010,
R26=3K/1206
Capacitor: E7=330UF, C20=470PF/1206,
C15=100NF/0805
Diode: D9/D11=USIM
VCC circuit (circuit with UC2844
compensation terminal inside)
Resistor: R1=100K/0805, R23=20Ω/1206
Capacitor: C13=100NF/0805, C16=10UF,
E5=100UF
Voltage regulator: Z1=ZM4746A
Compensation terminal circuit
Resistor: R27=R29=10K/0805, R28=100Ω,
R22=300OΩ
Capacitor: C18 = 1NF/0805, C19 =
AC310 Universal AC Drive Service Manual
Transformer
T1=VEICHI-PQ322Q
15V Circuit
Resistor: R15=2K/0805
Capacitor: E3=220UF, C8=100NF/0805
Diode: D6=USIM
-15V Circuit
Resistor: R21=2K/0805
Capacitance: E4=220UF, C12=100NF/0805
Diode: D7=USIM
VDR Circuit
Resistor: R24/R25=1.5K/1210
Capacitor: E14=100UF, E6=220UF
Diode: D10=USIM
Transformer primary side
Resistor: R145/ R146/ R147/ R148/ R149/
R150/
=360K/2010
R9/R121/R122/R123/R124/R120=51K/0805
R19/R20=6.2Ω/1210, R17=10K/0805
R14=1K/0805, R13=100Ω/1206
R16=4.02K/0805, R12=510Ω/0805
Capacitor: C2=10NF, C7/C11=470PF,
C10=4.7NF/08058, C9=100NF
25
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