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Service Manual
Wireless 2.4G TwinTouch+
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Table of Contents
1. Keyboard Testing Procedure: ...........................................................................................................3
A. Check the Oscillator................................................................................................................4
B. Check the U1...........................................................................................................................5
C. Check the J2 (RF 2.4G box)....................................................................................................7
2. Receiver of Keyboard Testing Procedure: .....................................................................................16
A. Check the Oscillator X1 ........................................................................................................ 17
B. Check the U2......................................................................................................................... 19
C. Check the J1 .......................................................................................................................... 24
3. Mouse Testing Procedure:.............................................................................................................. 27
A. Check the Oscillator..............................................................................................................28
B. Check the U2......................................................................................................................... 30
C. Check the J1 (RF 2.4G box)..................................................................................................33
D. Check the U1......................................................................................................................... 39
4. Receiver of Mouse Testing Procedure: ..........................................................................................44
A. Check the Oscillator..............................................................................................................45
B. Check the U1......................................................................................................................... 47
C. Check the J1 .......................................................................................................................... 51
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1. Keyboard Testing Procedure:
Please check the oscillator by
Oscilloscope.
If the wave diagram is not right, please
replace old with new one.
TEST OK
Please check the voltage and the wave
diagram of U1.
If the wave diagram is different, please
replace U1.
Please check the wave diagram of J2 (RF
2.4G box).
If the wave diagrams are different, replace
J2.
Please check the membrane if there is
still problems on keyboard.
If dust, replace membrane.
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A. Check the Oscillator
Please check if there is
4MHz on oscillator by
Oscilloscope.
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B. Check the U1
♦ Check the wave diagram of U1
Check the wave diagram
of U1. The wave
diagram should be the
same with below.
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♦ Check the voltage of U1
Check the U1 (3V
voltage) and it should be
the same with below.
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C. Check the J2 (RF 2.4G box)
♦ Check the wave diagram of Pin 1 on J2
Check the wave diagram
of pin 1 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 2 on J2
Check the wave diagram
of pin 2 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 3 on J2
Check the wave diagram
of pin 3 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 4 on J2
Check the wave diagram
of pin 4 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 5 on J2
Check the wave diagram
of pin 5 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 6 on J2
Check the wave diagram
of pin 6 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 7 on J2
Check the wave diagram
of pin 7 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 8 on J2
Check the wave diagram
of pin 8 on J2 and it
should be the same with
below.
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♦ Check the wave diagram of Pin 10 on J2
Check the wave diagram
of pin 10 on J2 and it
should be the same with
below.
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2. Receiver of Keyboard Testing Procedure:
Please check the oscillator by
Oscilloscope.
If the wave diagram is not right, please
replace the oscillator.
TEST OK
Please check the voltage and the wave
diagram of U2.
If the wave diagram is different, please
replace U2.
Please check the wave diagram of J1 (RF
2.4G box).
If the wave diagrams are different, replace
cable.
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A. Check the Oscillator X1
♦ Please check the first point of Oscillator X1
Please check if there is
8MGH on oscillator.
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♦ Please check the second point of Oscillator X1
Please check if there is
8MGH on oscillator.
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B. Check the U2
♦ Check the wave diagram of Pin 5 on U2
Check wave diagram of pin5
on U2 when keyboard
transmits signal to receiver.
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♦ Check the wave diagram of Pin 9 on U2
Check wave diagram of
pin9 on U2 when keyboard
transmits signal to receiver.
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♦ Check the wave diagram of Pin 14 on U2
Check wave diagram of
pin14 on U2 when keyboard
transmits signal to receiver.
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♦ Check the wave diagram of Pin 15 on U2
Check wave diagram of
pin15 on U2 when keyboard
transmits signal to receiver.
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♦ Check the wave diagram of Pin 25 on U2
Check wave diagram of
pin25 on U2 when keyboard
transmits signal to receiver.
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C. Check the J1
♦ Check the wave diagram of Pin 6 on J1
Check wave diagram of
pin6 on J1 when keyboard
transmits signal to receiver.
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♦ Check the wave diagram of Pin 7 on J1
Check wave diagram of
pin7 on J1 when keyboard
transmits signal to receiver.
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♦ Check the wave diagram of Pin 1 on J1
Check wave diagram of
pin1 on J1 when keyboard
transmits signal to receiver.
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3. Mouse Testing Procedure:
Please check the oscillator by
Oscilloscope.
If the wave diagram is not right, please
replace the oscillator.
TEST OK
Please check the voltage and the wave
diagram of U2.
If the wave diagram is different, please
replace U2.
Please check the wave diagram of J1 (RF
2.4G box).
If the wave diagrams are different, replace
J1.
Please check the wave diagram of IC U1
if the mouse can’t move smoothly.
If different, replace IC U1.
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A. Check the Oscillator
♦ Check the first point of Oscillator X1
Please check the wave diagram
of oscillator, and it should be
the same with below.
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♦ Check the second point of Oscillator X1
Please check the wave diagram
of oscillator, and it should be
the same with below.
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B. Check the U2
♦ Check the voltage of U2
Please check the pin of
U2, and the voltage
should be 3V as below.
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♦ Check the voltage of pin on U2 when mouse is not working
Please check the pin of U2,
and the voltage should be
3V as below when the
mouse is not working.
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♦ Check the voltage of U2 when mouse is working
Please check the pin of U2,
and the voltage should be 3V
as below when the mouse is
working.
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C. Check the J1 (RF 2.4G box)
♦ Check the wave diagram of Pin 1 on J1
Check wave diagram of pin1
on J1 when mouse transmits
signal to receiver.
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♦ Check the wave diagram of Pin 2 on J1
Check wave diagram of
pin2 on J1 when mouse
transmits signal to
receiver.
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♦ Check the wave diagram of Pin 3 on J1
Check wave diagram
of pin3 on J1 when
mouse transmits signal
to receiver.
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♦ Check the wave diagram of Pin 5 on J1
Check wave diagram
of pin5 on J1 when
mouse transmits signal
to receiver.
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♦ Check the wave diagram of Pin 8 on J1
Check wave diagram
of pin8 on J1 when
mouse transmits signal
to receiver.
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♦ Check the wave diagram of Pin 9 on J1
Check wave diagram
of pin9 on J1 when
mouse transmits signal
to receiver.
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D. Check the U1
♦ Check the wave diagram of Pin 6 on U1
When mouse is working,
please check the wave diagram
of pin6 on U1, and it should be
the same with below when
mouse is working.
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♦ Check the wave diagram of Pin 14 on U1
When mouse is working,
please check the wave diagram
of pin14 on U1, and it should
be the same with below when
mouse is working.
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♦ Check the wave diagram of Pin 15 on U1
When mouse is working,
please check the wave
diagram of pin15 on U1,
and it should be the same
with below when mouse is
working.
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♦ Check the wave diagram of Pin 16 on U1
When mouse is working,
please check the wave
diagram of pin16 on U1, and
it should be the same with
below when mouse is
working.
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♦ Check the wave diagram of Pin 17 on U1
When mouse is working,
please check the wave
diagram of pin17 on U1,
and it should be the same
with below when mouse is
working.
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4. Receiver of Mouse Testing Procedure:
Please check the oscillator by
Oscilloscope.
If the wave diagram is different, please
replace the oscillator.
TEST OK
Please check the voltage and the wave
diagram of U1.
If the wave diagram is different, please
replace U1.
Please check the wave diagram of J1 (RF
2.4G box).
If the wave diagrams are different, replace
cable.
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A. Check the Oscillator
♦ Please check the first point of Oscillator X1
Please check if there is
8MGH on oscillator.
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♦ Please check the second point of Oscillator X1
Please check if there is
8MGH on oscillator.
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B. Check the U1
♦ Check the wave diagram of Pin 6 on U1
Check wave diagram of pin6
on U1 when mouse
transmits signal to receiver.
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♦ Check the wave diagram of Pin 11 on U1
Check wave diagram of
pin11 on U1 when mouse
transmits signal to receiver.
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♦ Check the wave diagram of Pin 12 on U1
Check wave diagram of
pin12 on U1 when mouse
transmits signal to receiver.
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♦ Check the wave diagram of Pin 13 on U1
Check wave diagram of
pin13 on U1 when mouse
transmits signal to receiver.
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C. Check the J1
♦ Check the wave diagram of Pin 1 on J1
Check wave diagram of
pin1 on J1 when mouse
transmits signal to receiver.
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♦ Check the wave diagram of Pin 2 on J1
Check wave diagram of
pin2 on J1 when mouse
transmits signal to receiver.
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♦ Check the wave diagram of Pin 6 on J1
Check wave diagram of
pin6 on J1 when mouse
transmits signal to receiver.
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