4. TROUBLE SHOOTING
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(1) Checking Crystal Circuit
4. TROUBLE SHOOTING
TEST POINT
CIRCUIT
WAVEFORM
CHECKING FLOW
TP1
Figure 4.2.1
26 MHz O.K?
No
Crystal is OK.
See next page to check PLL Circuit
Yes
Replace X102
Figure 4.2.2
Figure 4.2.3
X102
TP1_1 pin :
26MHz
TP1
A11
B11
K12
K11
B2
A3
B3
A2
J8
USIF2_CTS_N
USIF1_TXD_MTSR
USIF1_RXD_MRST
USIF1_RTS_N
USIF1_CTS_N
DPLUS
DMINUS
XOX
XO
26MHz
DSX321G-26M
X102
2
1
3
4
BT_RXD
BT_TXD
USB_DP
USB_DM
UART_TX
UART_RX
NUB
Close to the 26MHz XTAL
Connect GND plane directly
TP1