S9k S9SE Maintenance Guide
10
●
S9K S9SE maintenance ideas
During the maintenance, conduct 10 tests before and after the main test chip (five before and after the chip: CLKO, CO, RI, BO, NRSTO); DC-DC output and
PIC voltage
CORE voltage; LDO (0.8V 1.8V), PLL-0.8V.
Detection method:
1) When the IO line is not inserted and only 12V is inserted: the DC-DC output is about 0V, and the boost output is about 0V. The PIC power supply
of 3.3V must be powered. The other test voltages are all 0;
2) When the IO line is inserted and the test button is not pressed, there is no voltage output from DC-DC and boost. After pressing the test button, the
PIC starts to work. At this time, the DC-DC outputs the voltage set by the test program of PIC jig, and boosts as it works. Then the jig outputs WORK,
and returns to noce after computing. At this point, the normal voltage of each test point should be:
CLKO:
0.9V
CO:
1.6-1.8V, when the jig is just sent to WORK, since the CO is negative, the DC level will be lowered, and the instantaneous voltage is about 1.5V.
RI
: 1.6-1.8V, when the voltage is abnormal or too low during computing, the computing board will be abnormal or the hashrate will be zero.
BO
: 0V when there is no computing, there will be a pulse jump between 0.1-0.3V during computing.
NRSTO
: 1.8V. A reset signal is re-outputted each time the test button of the jig is pressed.
When the above-mentioned test point status or voltage is abnormal, please estimate the fault point based on the circuit before and after the test point.
Details and distinction of S9K S9SE chip’s configuration file