1
C. Verify
Connect power supply again. You should see LCD
lights up and oscilloscope panel displayed.
2
Press various buttons and move switches to verify
their functions.
1 ) Make a small ring with a
lead cut-off.
20. Test signal ring
2 X 20 pin
22. LCD Board
:
J1
1 X 2 pin
:
J2, J3
2 ) Solder the ring to the two
holes of J2 (as shown in
the photo).
21. JP3
Short JP3 with solder
Note: Install to the side
opposite to LCD panel.
Test and Use
Step 2
NOTE: You need a 9V DC power supply (at least 200mA capacity)
to run the scope. This power supply is not included in the kit.
1
A. Check voltages
2
3
Apply 9V power to J10 (or J9).
2
Check voltage at TP22. It should be around +3.3V.
3
If voltage at TP22 is good disconnect power. Short JP4
with solder .permanently
1
B. Attach LCD board
Plug LCD board into the female headers J3, J7, and J8
on the main board.
1
A. Use
Attach probe clips to J1.
2
Touch the red clip with your finger. Do you see signal
from your finger?
1
- www.jyetech.com -JYE Tech Ltd.
Troubleshooting
Is voltage at V+
good?
Check power
supply
Is R36 value correct
and soldered good?
Do you get about 3V
between J1 pin 16 &
18 on LCD board?
Fix R36
LCD Dark
No
No
Yes
Yes
(No backlight)
No
Yes
Check R36 and
power again
Check LCD
board
Press SW8. Does LED blink?
Check Y1, C12, C13
Check LED installation
Check +3.3V voltage
Check J3 soldering for
possible opens or shorts
No Display
Yes
No
Check J1 soldering on LCD
board for possible opens
or shorts (use Test Mode)
2
8.60V
9.39V
8.34V
3.3V
-1.39V
2.16V
0.81V
6.43V
0.19V
5.02V
3.3V
4.99V
-5.0V
-8.08V
-8.11V
1.66V0V
*
*
**
*
*
*
**
**
Voltage
References
(Input Voltage)
*: These voltages are input voltage dependent. The values
shown were measured when input voltage was 9.39V.
**: These voltages are measured when CPL switch (SW1)
is set to GND position.
NOTES:
Place the negative pen of volt-meter
here to do voltage measurements.
The assembly should look like this
after you have finished all parts
Short JP4 if it has not been
done. See Step 2 above.
Check U2B, U2C and
related parts around
these two amplifiers
No
Set CPL switch to GND
and measure V1 and V2.
Are they correct?
Check R12 and C8
Visit forum for detailed
troubleshooting guide
Are the values of AV+ and
AV- correct?
No Trace
Yes
No
Yes
The voltages in the photo are for reference only.
The voltages on your board could be different.
But they should be close to the values shown.
NOTE 1:
www.jyetech.com/forum
Tech Support:
“Trigger” LED blinking twice
indicates booting-up is good.
Page 2
Test Mode
What it is and how it works
Test Mode is used to find out possible opens (for all port pins) and shorts
(for pins PB0 - 15 and PC13-15). When entered it first checks PB and PC
pins with special patterns to find out possible shorts. If found LED will be
fast blinking. Otherwise, it generate 3.3V and 0V alternatively at each port
pins (PA, PB, PC and PD) in cycle of about 4 seconds. These signals can be
used to check for opens.
How to use
Hold down SW4 and press RESET to enter Test Mode.
If you see LED fast blinking that means there are shorts on PB or PC pins.
You need to find out the shorts first.
If you see LED slowly blinking use a volt-meter to check each pin related
connections that are suspected open. When you don’t see voltage change
at a spot which is supposed being connected to a port pin there may be
open between the spot and the port pin.
1.
2.
3.
PIN 1
Make sure U1 and LED working
(you see LED blinks twice at pressing
RESET) before using Test Mode.
NOTE 3:
LED will be blinking constantly if MCU
(U1) can not detect valid LCD controller.
Check LCD pin-header soldering.
NOTE 2:
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