Read Sharp XV-Z2000E (serv.man12) Service Manual online
37
XV-Z2000
DT-400
DT-400
Checking the peripheral circuits of the
microprocessor
microprocessor
Are the voltages of approx. 3.3V and 2.5V
applied to both ends of C8001 and C8056
respectively?
applied to both ends of C8001 and C8056
respectively?
Go to "Checking the power supply
system".
system".
Are the oscillations of 133MHz and
74.25MHz outputted from pin (3) of
X8003 and pin (3) of X8007 respectively?
74.25MHz outputted from pin (3) of
X8003 and pin (3) of X8007 respectively?
Check X8001, X8003 and their peripheral
circuits.
circuits.
Does each terminal of R8038, R8039,
R8041, R8042 and R8050 change?
R8041, R8042 and R8050 change?
Check IC8202 or IC8001 is defective.
Do pins (15) and (16) of IC2002 change?
Check IC8203 or IC2002 is defective. The
I2C bus does not function normally.
I2C bus does not function normally.
Do pins (46) to (49) and (4) to (7) of
IC2002 change when any key is
operated?
IC2002 change when any key is
operated?
IC2002 is defective. The keys do not
function normally.
function normally.
When the power button is pressed, does
the voltage of pin (7) of IC8006 become
3.3V?
the voltage of pin (7) of IC8006 become
3.3V?
IC8001 is defective.
Do pulse-shaped waveforms appear at
pins (1), (2), (5) and (6) of IC8006?
pins (1), (2), (5) and (6) of IC8006?
IC8006 is defective.
Does the voltage of pins (3) and (6) of
IC8003 change?
IC8003 change?
IC8003 is defective.
Is the voltage of pin (2) of Q8002 5V?
Q8002 is defective.
Does the fan rotate?
Check the power supply circuit or fan
circuit on the main circuit.
circuit on the main circuit.
Go to "Checking the lamp light-up".
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
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