Customer Diagnostics & Technician Diagnostics - Dentsply Sirona CEREC AC Operating Instructions Manual

Dentsply Sirona
Operating Instructions CEREC AC
Test
Display Script
Activity is rotating cursor
Test CPU-1
Test CPU-2
Test NPU-1
Test NPU-2
Test Timer
Test Keyboard Controller
Test INT #1
Test INT #2
Test DMA #1
Test DMA #2
Test SM Bus
63 81 136 D3492
D3492.201.06.35.02 09.2019
10.3.1 Customer Diagnostics & Technician Diagnostics
Test description / condition
Control command without a test
function
The CPU test checks the control,
address, data, and flag register of
the system processor.
When testing the floating point unit
(NPU, Numeric Processing Unit) the
system's mathematics processor
and the interface between the two
functions are checked.
In this test a number is loaded into
the three timer channels and then a
check is made on whether the
countdown takes place at the right
speed in the individual channels
(not too fast or too slow).
This test checks the proper function
of the electrical circuit for the key-
board controller.
The test tool checks the system in-
terrupt controller. These controllers
contain the interrupt mask register,
in-service register, interrupt request
register, and all of the interrupt re-
quest lines. All channels on the in-
terrupt controllers are checked for
problematic, incorrect, or defective
interrupts.
During the test all of the registers
and status ports of the two DMA
controllers are checked. The DMA
controller is extremely important for
system operation, as it has separate
channels which the E/A devices can
use to directly access the system
RAM. This enables high data trans-
fer rates without using the micropro-
cessor.
This test checks the SMBus. This
bus is mainly used in systems to
manage the battery and sensor. The
SMBus is also used to access the
SPD data on the memory modules.
10 PC Diagnostic Tool
10.3 Troubleshooting
Action if problems occur
n.a.
➢ Replace the PC.
➢ Replace the PC.
➢ Replace the PC.
➢ Replace the PC.
➢ Replace the PC.
➢ Replace the PC.
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