Antminer APW8 Operating manual
APW8 Power Supply Maintenance Guide
1
Instructions for Power Supply Maintenance
Version date: 2010.7.23
File Category: Maintenance Guide
Content of this Volume: It mainly describes the troubleshooting of various faults of the power
supply APW8, and how to use the test tool for accurate positioning.
※The copyright of this article belongs to Bitmain. The article shall solely be reprinted, extracted or used in
any other ways with the permission of the copyright owner. Please contact Bitmain official customer service if
there is any need of reprinting or quoting.
I. Requirements on the Maintenance Platform
1. The constant temperature soldering iron above 80W (soldering temperature: 300-350°C). The tip
soldering iron head is used for soldering chip resistors and capacitors. The blade type soldering iron
head is used for soldering and replacement of plug-in components (soldering temperature: 380-
420°C)
2. The thermal chimney is used for chip disassembly and soldering, be careful not to heat for a long
time to avoid PCB foaming (soldering temperature: 260°C ±2 °C).
3. The AC controllable power supply voltage regulator (output 200-250V, can limit 0-20A current)
is used for APW8 power-on inspection. If there is no such condition, a 100W ordinary light bulb
can also be strung on the AC fire line with mains. Be careful.
4. For electronic load (power 2KW, meet the voltage 0-50V), if there is no such condition, a
resistive load that matches the APW8 can also be made.
5. The multimeter, suction gun, tweezers, V9-1.2 test jig and special power test card firmware (if
there is condition, an oscilloscope can be configured).
6. Flux, lead-free tin wire, water for cleaning panel with anhydrous alcohol; water for cleaning
panel is used to clean flux residue and appearance after maintenance.
7. Thermally conductive silicone grease (2500) is used to repair the thermal conduction between the
MOS and the cooling fin, thermal conductive silicone (704 silica gel) is used for fixing and
covering the glue damage at the original after the repair of the PCBA components
II. Requirements on Maintenance Operations
1. The maintenance personnel must have certain electronic knowledge, more than one year of
maintenance experience, and a certain understanding of the working principle of switching power
supply, and well master the soldering technology.
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2. Before the product is opened and the PCBA panel is repaired, the large capacitor must be
discharged, and the voltage must be measured with a multimeter (less than 5V discharge), and then
the soldering operation can be performed! Be sure to confirm to avoid electric shock.
3. Pay attention to the working method when judging the circuit components. After replacing any
device, the PCB panel has no obvious deformation, the soldering of bonding pad is reliable, and the
replacement parts and the surrounding area have no problem such as insufficient parts, open circuit
or short circuit.
4. After replacing the key components, the main circuit shall have no short circuit and other obvious
abnormalities before the AC voltage test, otherwise there is a hidden danger of explosion.
5. It needs AC220V voltage to judge the circuit signal; pay attention to operational protection.
The following: Notes, key slogans
● Maintenance personnel qualifications must meet the specified requirements;
● Instruments and equipment used for maintenance must meet the specified
requirements;
● The instruments and equipment for maintenance must be effectively grounded, and
the maintenance environment must comply with anti-static requirements;
● Materials used for maintenance must meet the specified requirements; in order to
guarantee the accuracy and traceability of the materials used for maintenance, the
materials used for maintenance must be the production materials for the corresponding
models, and the material replacement must be confirmed;
1. In order to prevent possible electric shock hazard, non-professionals should not
disassemble the enclosure:
2. The maintenance personnel shall use a special enclosure opener to open the enclosure
of power adapter and repair, to avoid damage to the internal components of the product:
3. After the product is opened, it is required to discharge the high voltage capacitor;
4. E-waste waste generated during product maintenance cannot be arbitrarily dropped:
5. Bad products must have a repair process card and indicate the cause of the failure, and
placed separately;
6. The repaired products must be well marked to distinguish.
7. The repaired products must be placed in the repaired area and shall be systematically
tested before they can be stored.
III. The Principle and Structure of the Power Supply
1. Principle overview
1.1 APW8 consists of 1 large panel, 2 fans and the upper and lower enclosures. The normal input
AC220V has two DC output voltages, which are SB 12V respectively. The main voltage
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output is controlled by the PIC port and the mining machine communication, and
different models’ DC voltage range is (8V-9.2V, 10V-11V, 16.32V-20.04V)
1.2 Performance characteristics and scope of use: S15, T15 with APW8 power supply 16.32V-
20.04V as follows:
APW8 power supply is a high-efficiency DC power supply designed and manufactured by our
company. It has single-phase AC input and two DC outputs:
1>. 16.32V-20.04V voltage adjustable output, the maximum current can reach 95A;
2>. 12V voltage fixed output, the current can reach 5A.
The adjustable output part of voltage can meet the common DC load use within 95A current of
the adjustable voltage range, especially suitable for circumstances with strict requirements for
power supply of servers and mining machines; the 12V voltage’s fixed output part can meet
the use of control panel and cooling fin.
1.21 The are following characteristics:
200-240V voltage input
There is protection for undervoltage, short circuit, overload, over temperature, with
automatic recovery after fault removal
The use of high-quality devices ensures stable and reliable products through reasonable
design, and can work at full load for a long time in a high temperature environment at 60°C
or lower.
Small size, high power density
1.3 Appearance of APW8 Power Supply
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Note: If you need to turn on the default voltage 16.32V test, you can use the adapter cable
to short connect the voltage Pin EN to GND.
● Distribution on the front panel of the power supply: one triangle-shape AC input
interface
two size-4028 high speed fans
●Distribution on the left side of the power supply: four PCB-33 copper soldering
terminals with adjustable voltage output
one 4Pin signal terminal
one 12V fixed voltage output PCIE terminal
● Distribution on the rear panel of the power supply: 1 set of air outlets, forming the air
outlet of the high-speed fan.
Air Inlet
AC Input
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● The model of the AC input terminal on the power supply front panel is C14, and the AC
input cable of the C13 interface is required.
● The 4Pin signal terminal is the interface between the external control panel and the
power supply. The SDA/SCL is the I2C protocol, and can adjust the output voltage of the
power supply through I2C. EN is the enable signal of the power supply, and the control
panel can enable the power supply through EN, which is effective in low level.
● The output part of the adjustable voltage adopts four PCB-33 copper soldering
terminals, 90-degree side foot binding posts, M4 high current horizontal fixed seat; the 2
terminals close to the air outlet are output positive poles, and 2 near signal terminals are
output negative poles, the output line or output copper bar can be fixed on terminal by
M4 screw, which is convenient and flexible to use.
● The output part of the 12V fixed voltage uses the PCIE output terminal. The PCIE
output terminal diagram is as follows:
1.4 Parameters of APW8 Power Supply:
OUT1
DC voltage
16.32V-20.04V (Power on
default voltage 15.9V-16.3V)
Lower limit 15.9V-16.3V, upper
limit 19.95V-20.5V
Rated current (at
220V input)
95A
Rated power (at
220V input)
16.32V/1550W---
20.04V/1850W
Ripple and noise
<1%
Source regulation
rate
<1%
Load regulation
rate
<1%
Startup, rise time
<2S
Power down
holding time
>10mS
OUT2
DC voltage
12.3V
The PCIE output line consists of two color lines,
the 12V positive line is yellow, and the negative
s line is black.
Definition of 6PIN PCIE terminal positive and
negative poles:
Positive pole: yellow 1, yellow 2, yellow 3
Negative pole: black 4, black 5, black 6
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Rated current (at
220V input)
5A
Ripple and noise
<1%
Voltage accuracy
12.2V---12.4V
Source regulation
rate
<1%
Load regulation
rate
<1%
Startup, rise time
<2S
Power down
holding time
>10mS
Input
Voltage range
200-240V AC
Frequency range
47-63Hz
Power factor
>0.99(full load)
Leakage current
<1.5mA（220V 50Hz）
Protection
Input undervoltage
protection value
80-89V AC
Output short
circuit
Yes
Output overcurrent
protection value
95-130A
Over temperature
protection
Yes S
Environment
Operating
temperature
-20-60℃
Working humidity
20%-90%RH (no condensation)
Altitude
Lower than 2000m
Structure
Size
204.8SSS*157*42.5mm
Net weight
1.7kg
Cooling method
Forced air cooling
Noise
67dBA
2. Maintenance ideas and cases of common faults
2.1 Block diagram for power basic principle
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基本原理工作流程图：Basic principle work flow chart
AC 输入 200V- 240V：AC input of 200V-240V
EMI/LC 电路：EMI/LC circuit
整流电路：Rectifier circuit
PFC 电路：PFC circuit
VBUS 滤波大电容：VBUS filter large capacitor
FAN 电路、12V 反馈及 OUTPUT：FAN circuit, 12V feedback and OUTPUT
12V/VCC 电路：12V/VCC circuit
主开关 MOS：Main switch MOS
LLC--DC 转换电路：LLC--DC switching circuit
VCC- PWM 电路：VCC-PWM circuit
隔离驱动：Isolation drive
DC 驱动电路：DC drive circuit
同步整流滤波：Synchronous rectification filter
PIC 控制电路：PIC control circuit
反馈稳压电路：Feedback regulator circuit
DC 主电压 OUTPUT 电路：DC main voltage OUTPUT circuit
2.2 Power PCBA board layout
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DC 同步整流主输出电路：Main output circuit of DC synchronous rectification
12V 及VC 电路：12V and VC circuits
主开关 MOS：Main switch MOS
PWM 主控电路：PWM main control circuit
PIC 调控：PIC regulation
PFC 电路：PFC circuit
大电容高压滤波储能：Large-capacity high-voltage filter energy storage
AC 输入 EMI 电路：AC input to EMI circuit
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Physical picture, there will be small differences in product versions, but the principle is
similar.
2.21 AC inputs EMI to PFC circuit schematic, focus on measuring whether F1 insurance, U2
rectifier bridge, Q4, D7, D5, D6 are damaged.
整流桥：Rectifier bridge
AC 输入 EMI：AC input to EMI
开关防浪涌电阻：Switch anti-surge resistor
继电器：Relay
PFC 开关 MOS：PFC switch MOS
PFC 驱动：PFC driver
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2.22 12V auxiliary circuit principle, focus on measuring whether voltage detection starts
resistor R33, 47K and connecting with HV to D1, D2, and whether Q5, D8, D9, T1 is damaged.
高电压输入：High voltage input
电压检测启动：Voltage detection starts
12V 主开关 MOS：12V main switch MOS
驱动 IC：Driver IC
VCC 12V 供电：VCC 12V power supply
风扇供电：Fan power supply
12V 变压器及整流输出：12V transformer and rectifier output
12V 稳压反馈电路：12V regulated feedback circuit
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