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.

APW8 Power Supply Maintenance Guide
2
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

APW8 Power Supply Maintenance Guide
3
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

APW8 Power Supply Maintenance Guide
4
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

APW8 Power Supply Maintenance Guide
5
● 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

APW8 Power Supply Maintenance Guide
6
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

APW8 Power Supply Maintenance Guide
7
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

APW8 Power Supply Maintenance Guide
8
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

APW8 Power Supply Maintenance Guide
9
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

APW8 Power Supply Maintenance Guide
10
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

APW8 Power Supply Maintenance Guide
11
12V 正常时，PFC 大电容 370-380V 电压正常，自动开 VCC12V 主控制供电：When 12V is
normal, the PFC large capacitor 370-380V voltage is normal, and the VCC12V main control power
supply is automatically turned on
2.23 The main control PWM drive circuit, PIC control voltage regulation schematic diagram,
focus on the main IC VCC power supply and drive transformer.
稳压反馈：Voltage regulation feedback
PWM 主驱动电路: PWM main drive circuit
PIC 芯片及控制电路: PIC chip and control circuit
PIC 烧录及通讯端口: PIC burning and communication port
输出端同步整流驱动: Synchronous rectification drive at output end
驱动信号隔离: Drive signal isolation
2.24 Main switch MOS and transformer conversion buck synchronous rectification DC filter
output circuit, focus on the main switch MOS Q14; Q15; Q6; Q16, the output rectifier side
positive and negative have no short circuit.

APW8 Power Supply Maintenance Guide
12
OLP 过载保护：OLP overload protection
主控全桥开关 MOS 电路：Master control full bridge switching MOS circuit
注：如只有 2个MOS 为半桥电路：Note: If there is only 2 MOS, it is a half-bridge circuit
主变压器转换同步 MOS 整流滤波：Main transformer conversion synchronous MOS
rectification filter
DC 输出电路: DC output circuit
2.25 Location of A side of SMD patch and B side of plug-in

APW8 Power Supply Maintenance Guide
13
Figure 1 SMD patch side location
Figure 2 Plug-in side location

APW8 Power Supply Maintenance Guide
14
2.3 Maintenance steps
2.31. Check whether the appearance of the power supply is seriously damaged or deformed, and
whether the DC fan and the AC socket are damaged.
2.32. Power on AC220V, check whether the fan is rotating normally, and use the multimeter to
measure whether the output J6 terminal’s voltage is 12V (12.1V-12.50) to eliminate measuring
error
2.33. Open the enclosure to check whether the components and solder surface have sparking
phenomenon (focus on whether the R33 resistor is damaged), use a multimeter to detect whether
the AC input terminal’s F1 fuse has open circuit, whether the U2 rectifier bridge; PFC MOS Q1;
D7; D5; D6 have short circuit, whether the PWM circuit’s main switches MOS Q6; Q14; Q15; Q16
and output patches MOS Q17; Q18; Q19; Q20 have short circuit; if there is a short circuit, the
component position should be checked and replaced, pay attention to the circuit resistance around
bad bit MOS tube; the transistor may be damaged and needs to be replaced.
2.34. Detect whether the auxiliary 12V circuits U5; T1; Q5; D11 have short circuit or open circuit,
and whether the surrounding components are burned, etc., replace if necessary.
2.35. If there is no abnormality in the above locations, the F1 fuse path is normal. After the AC is
powered on, the DC fan rotates (if there is no rotation, check whether the fan socket has voltage of
12V, if the voltage is normal, replace the fan); the output terminal J6 has 12V voltage, measure
whether there is DC370V-380V at both ends of PFC large capacitor C16 or C17, otherwise check
whether U1, pin 7V VCC power supply has 12V or judge material damage and replace, if there is
no abnormality, it needs to detect PWM circuit U9; U10; U11; whether supply VCC has 12V
voltage or judge material damage and replace, and whether the T4 drive transformer is damaged.
2.36, other bad needs to be further analyzed and judged according to the skills of maintenance
personnel,
After the above check, the single power supply test main circuit DC output needs to be short
connected to the J15 PIN 4-5, as EN-GND pin shown in the figure. Note that short connection
errors may damage the chip. After the defective device is replaced and the soldering is correct, the
AC220V test can be performed.
2.4 Diagram for electrical function test connection, PCBA main voltage measurement point.

APW8 Power Supply Maintenance Guide
15
（一）测试设备:功率计、万用表、电子负载、或者其他同类型自动测试仪器。(DC
输出正常时，如没有负载也可以用带矿机测试)。
(1) Test equipment: power meter, multimeter, electronic load, or other similar automatic
test equipment. (When the DC output is normal, it can be tested with a mining machine if
there is no load).
（二）测试连接图如下:
(2) The test connection diagram is as follows:
S15 矿机控制板: S15 mining machine control panel
外供 12V 1A: External supply 12V 1A.
AC200-240V 输入: AC200-240V input
16A 开关: 16A switch
被测电源: Power supply under test
电子负载 1: Electronic load 1
电子负载 2: Electronic load 2
输入端 AC 源需接保护装置，以免未完全修好的开关电源二次上电炸机。
The AC source at the input end needs to be connected to a protection device to avoid the
secondary power-on explosion when it is not fully repaired.
TEST7 与TEST2 负极万用表量测 VBUS: TEST7 and TEST2 negative multimeters
measure VBUS
电压 375-385V DC: Voltage 375-385V DC

APW8 Power Supply Maintenance Guide
16
TEST11 与TEST7 负极万用表量测 VCC 12-13V: TEST11 and TEST7 negative
multimeters measure VCC 12-13V
2.41 Diagram for S15 control panel V1.2 and APW8 power PIC port connection test, label 1 is the
dedicated card test firmware, 2 is the DC voltage debugging high-low conversion button, 3 is the
PIC communication port, 4 is the control panel socket, 5 is 12V power supply; note that yellow
indicates positive and black indicates negative. Note: After the general power supply defective
products are repaired, the power supply only needs to be short connected with the PIC
communication J15 port EN-GND pin, and if there is voltage output 16V, it is normal, and the
following single test for the control panel is not requried (when the PIC single chip is damaged, or
when the firmware is abnormal, it needs to test a small panel before re-burning), and the
corresponding mining machine test can be directly installed.
2.5 Simple judgment and maintenance of common faults of mine power supply
No
.
Fault symptom
Cause
Solution
1
The fan does not run,
there is no 12V output
The power supply on the
AC side is abnormal
1. Check if the AC input line of the power supply is normal and the plugs at
both ends are not loose.
2. Check if the grid is powered and the voltage is normal.
2
The fan runs normally,
there is no 12V output
1. Low grid voltage
2. Power protection
1. Use a multimeter to confirm that the current voltage is above 205V, so
that the power can be turned on.
2. Detect whether the power supply has an output short circuit or overload.
This situation will cause the power supply to enter the lock protection state.
It needs to be re-powered after the fault is removed to recover.
3
After the power supply
stops output for a few
seconds, it resumes
normal operation. After
a few minutes of
continuous operation, it
The power supply has
entered the over
temperature protection
1. Check if the fan is running normally
2. Check if the cooling air duct of the power supply is blocked.
3. Check if the power supply has accumulated excessive dust inside for a
long time.
4. Check if the power used by the power supply or the ambient temperature
exceeds the value of the power supply limit curve.

APW8 Power Supply Maintenance Guide
17
stops outputting again.
4
Output is normal, the fan
does not work
The fan is faulty
1. Check if the fan is blocked by debris
2. The fan is faulty
5
The normally working
power supply suddenly
has no output and will
not start again
Overcurrent protection
of the power supply
Check whether the current of the load exceeds the upper limit of the
overcurrent protection of the power supply. The power supply sets the
overcurrent protection to the locked state, to prevent the power supply from
continuing to output when the load is abnormal, causing a dangerous
situation such as a fire.
2.6 After the power supply maintenance test is normal, it is required to operate normally for 2
hours with the rated load of 80% (80A) or more before it can be used by the client.