ANT+ S19 Manuale operativo
S19 Maintenance Guide
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I. Maintenance platform/tool/equipment preparation requirements
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1. Platform requirements:
Rubber blanket repair workbench (workbench needs to be grounded), anti-static wristband and grounding.
2. Equipment requirements:
Constant temperature soldering iron (350℃- 380℃) and pointed soldering iron tip are used for soldering small patches such as chip
resistors and capacitors; heat gun, BGA rework station are used for chip/BGA disassembly and soldering; multimeter with soldering steel
pin and heat-shrinkable T bush is used for easy measurement (Fluke is recommended); Oscilloscope (Agilent recommended), network
cable (requirements: Internet connection, stable network)
3. Requirements for test tools:
APW12 power supply (APW12_12V-15V_V1.2 and power adapter cable (self made: use thick copper wires to connect the power supply
at positive and negative poles and the hashboard. It is recommended to use 4AWG copper wires with a length of 60cm or less) for the
hashboard. Use the test fixture of the V2.2010 control board. The positive and negative poles of the test fixture need to be installed with
discharge resistors. It is recommended to use a cement resistor of 25 ohms and more than 100W.
4. Maintenance auxiliary materials/tool requirements:
Solder paste column M705, flux, board washing water with absolute alcohol; board washing water is used to clean up the solder residue
after repair; thermal gel (specification: Fujipoly SPG-30B) is used to smear the surface of the chip after repair ；
ball-planting steel mesh, solder absorption wire, solder ball (the ball diameter is recommended to be 0.4mm); when replacing a new chip,
you need to tin the chip pins and then solder to the hashboard, and then lock large heat sinks after applying thermal gel evenly on the chip
surface.
1) Barcode scanning gun (purchase reference link: https://item.jd.com/11829261868.html)
2) Port adapter board RS232/TTL adapter board 3.3V
(Purchase reference link: https://detail.tmall.com/item.htm?spm=a230r.1.14.6.751533f7AP9fR8&id=583960428696)
3) Self-made short-circuit probe (use pin wire for welding, require the heat-shrinkable T bush, prevent short circuit between probe and
small heat sink)
5. Common maintenance spare material requirements:
0402 resistance (0R, 51R, 10K, 4.7K,); 0402 capacitor (0.1uf, 1uf)
II. Maintenance requirements
1. Pay attention to the operation method when replacing the chip. After replacing any accessories, the PCB board shall have no obvious
deformation. Check the replacement parts and the surrounding parts for open circuit and short circuit issues.
2. The maintenance operators must have certain electronic knowledge, more than one year of maintenance experience, and be proficient in
BGA/QFN/LGA package soldering technology.
3. After repairing, the hashboard must be tested for more than two times to be OK before it can pass!
4. Check whether the tools and hashboard testers can work normally, determine the maintenance station to test software parameters, test
fixture versions, etc.
5. In the test of repairing and replacing the chip, the chip needs to be tested first, and then the function test shall be performed after passing.
The function test must ensure that the small heat sink is welded qualified. When installing the large heat sink, the surface of the chip must
be evenly coated with thermal gel and the cooling fan shall be at full speed. When using the chassis to dissipate heat, 2 hashboards should
be placed at the same time to form an air duct.
6. When measuring the signal, use 4 fans as assistance for heat dissipation, and the fans shall maintain full speed.
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7. When powering on the hashboard, user must first connect the negative copper wire of the power supply, then the positive copper wire of
the power supply, and finally plug in the signal cable. When removing, the order of installation must be reversed. First remove the signal
cable, then remove the positive copper wire of the power supply, and finally remove the negative copper wire of the power supply. If the
user do not follow this order, it is very easy to cause damage to R8, R9, U1, U2 (not all chips can be found). Before testing the pattern, the
repaired hashboard must be cooled down before testing, otherwise it may cause PNG testing.
8. To replace a new chip, printing pins and soldering paste are required to ensure that the chip is pre-soldered and then soldered to the
PCBA for repair
III. Hashboard tester making and matters needing attention
The supporting fixture of the hashboard tester should satisfy the heat dissipation of the hashboard and facilitate the measurement of signals
1. Use the 19 series hashboard tester SD card swiping program for the first time to update the hashboard tester control board FPGA, unzip
it and copy it to the SD card, and then insert the card into the hashboard tester card slot; power on for about 1 minute and wait for the
control board indicator to double flash 3 times, then the update is completed; (if it is not updated, it may cause a certain chip to be bad
during the test)
Figure 3-1
2. Make the test SD card according to the requirements, and directly unzip the compressed package of the single-sided heat sink inspection
chip to make the SD card;
Figure 3-2
3. The test SD card will be made according to the requirements, and the double-sided heat sink 8-times Patter test needs to make an SD
card, as shown in the figure below;
Figure 3-3 Figure 3-4
Figure 3-5 Figure 3-6
Naming as Config.ini
Delete original Config file
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Figure 3-7 Figure 3-8
IV. Principle overview
1. Working structure of S19 hashboard:
The hashboard is composed of 76 BM1398 chips, which are divided into 38 groups (domains), and each group is composed of 2 ICs; the
operating voltage of the BM1398 chip used in the S19 hashboard is 0.36V; for the 38th, 37th, 36th, 35th, 34th, 33rd, 32nd group (7 groups
in total), LDO is powered by the 19V output from the boost circuit U9 and outputs 1.8V. The 30th group - the first group are supplied by
VDD13.64V through the LDO to provide 1.8V, and the voltage of each domain retreated is reduced by 0.36V. All 0.8V is provided by the
1.8V output of this domain via LDO, as shown in Figure 4-1;
Figure 4-2
Figure 4-1
Change Config (2) to Config
Complete making
1.8V input - 0.8V output
19V input - 1.8V output
13.64 input - 1.8V output
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Figure 4-3
Figure 4-4
2. S19 hashboard boost circuit:
The boost circuit transfers the 14V powered by the power supply to 19V, as shown in Figure 4-5.
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Figure 4-5
3. Signal trend of S19 chip:
1) CLK (XIN) signal flow direction, generated by Y1 25M oscillator, transmitting from chip 01 to chip 76; voltage of 0.7V-1.3V;
2) TX (CI, CO) signal flow direction, from IO port 7 pin (3.3V) into IC U2 through level conversion, and then transmitted from chip 01 to
chip 76; the voltage is 0V when the IO signal is not inserted, and the voltage is 1.8V during operation;
3) RX (RI, RO) signal flow direction, from chip 76 to chip 01, return to the signal cable terminal pin 8 through U1 and then return to the
control board; when the IO signal is not inserted, the voltage is 0.3V, and the voltage will be 1.8V during computing;
4) BO (BI, BO) signal flow direction, from chip 01 to chip 76; the multimeter measurement value is 0V;
5) The RST signal flow is from pin 3 of the IO port, and then is transmitted from chip 01 to chip 76; if no IO signal is inserted and
equipment is in standby, voltage is 0V, 1.8V when computing;
4. Whole machine architecture:
The whole machine is mainly composed of 3 hashboards, 1 control board, APW12 power supply, and 4 cooling fans, as shown in Figure 4-
6.
Figure 4-6
V. Common faults and troubleshooting steps of the hashboard
1. Phenomenon: single board test detection chip is 0 (PT1/PT2 stations)
First step: check the power output first, please check the circled part in Figure 5-1.
APW 12 Adjustable Power
Control board
Fans
Hashboard
DC output 12-15V
Out capacitance is small
Circuit stability shall be tested after
recovering the board
resistance of larger than 1/8 is recommended
the current shall not flow from chip but
through the diode output capacitance at
the earlier stage of powering on
Capacitance = 4.7μF
False loading is 10K, it will take 100ms
to release to 4V
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Figure 5-1
Second step: to check the voltage output in the voltage domain
The voltage of each voltage domain is about 0.36V. If there is 14V power supply, generally it has domain voltage. The priority is given to
measure the output of the power supply terminal of the hashboard and whether the MOS is short-circuited (measure the resistance between
pins 1, 4 and 8). If 14V has power supply but no domain voltage, continue to check.
Figure 5-2
Third step: to check the PIC circuit
Measure whether there is output on the second pin of U3 and the voltage is about 3.3V; if yes, please continue to troubleshoot the problem;
if there is no 3.3V, please check the connection status of the hashboard tester cable and the hashboard is OK, and reprogram the PIC.
It will take 2ms to increase to 24.5V.
It will take 1.9ms for simulation increase
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Figure 5-3
Figure 5-4
Figure 5-5
PIC programming steps:
1. PIC program programming on the hashboard.
Program: 20200101-PIC1704-BM1398-V89.hex
Download the programming tool: PICkit3, pin 1 of the PICkit3 cable corresponds to pin 1 of J3 on the PCB, and pins 1, 2, 3, 4, 5, and 6
need to be connected.
Figure 5-6
2. Programming software:
Open MPLABIPE and select device: PIC16F1704, click power to select the power supply mode, then click operate. The first step: select
file to find the .HEX file to be programmed; the second step: click connect to connect normally; the third step: click the program button,
and after completion, click verifiy to prompt the verification to prove that the programming is successful.
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Figure 5-7
Figure 5-8
Forth step: check the boost circuit output
C55 in the test diagram 4-9 can measure 19V voltage.
Figure 5-9
Figure 5-10
Fifth step: check the output of each group of LDO 1.8V or PLL 0.8V
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Figure 5-11
Sixth step: check the chip signal output (CLK/CI/RI/BO/RST)
1. Refer to the voltage value range described by the signal trend. If the measurement encounters a large deviation of the voltage value, it
can be compared with the measured value of the adjacent group to determine.
PS: If the hashboard is not powered or powered off according to the test sequence, causing R8, R9, U1, and U2 to burn out, the chip will
report 0;
Figure 5-12
2. When the EEPROM NG is displayed on the LCD screen of the hashboard tester, check whether the welding of U5 is normal;
3. If the PICsensorNG is displayed on the LCD screen of the hashboard tester and the test read temperature is abnormal, then follow the
steps below to troubleshoot:
A) Check whether the 4 resistors of R24~R27 are welding abnormally, and check whether the welding of PIN2, 3 of U3 is normal;
Figure 5-13
Indice
