(No.RA027<Rev.001>)1-17
for the BT. (19.2M_BT)
C108 : Sine waveform,
19.2MHz, 0.2 to 1.2 Vp-p
Verify the BT control signal (RXD0).
IC13 (16 pin):
Square waveform UART data of
3.3V logic.
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
[The 19.2MHz clock is faulty]
Replace the X1, R60, R47,
R48, C36, C39
Still replace the PCB in the
case of abnormal condition.
Verify the BT control signal (TXD0).
IC13 (15 pin):
Square waveform UART data of
3.3V logic.
19.2MHz,1.2Vp-p
of 1.8V logic
Still replace the PCB in the
[The BT_RX (TXD0)
signal (BT_TX)
.
[The RXD0 (BT_TX)
Replace the IC13, CP2
.
Replace the ANT1, L45,C156,
R142, R147, L30, C138
Descriptions of signal names
(1) 33D: BT IC 3.3V power supply
(2) 18D: BT IC 1.8V power supply
(3) TXD0: BT serial data line connected to UART TX of MPU IC (MPU to BT IC)
(4) RXD0: BT serial data line connected to UART RX of MPU IC (BT IC to MPU)
(5) BT_RX: BT serial data line connected to UART RX of BT IC (MPU to BT IC)
(6) BT_TX: BT serial data line connected to UART TX of BT IC (BT IC to MPU)
(7) /BT_SHDN: BT active control of MPU IC (MPU to BT IC) High: Active, Low: Reset
[The BT IC is faulty]
Replace the PCB.
Replace the R67, C52, R72, R73,
Q5, R80, R83, C65, L8, C67, C71,
R85, Q8, R88,R89, R92, R96,
Q11, C108
When a normal
condition is confirmed.
Verify the 19.2MHz clock circuit
When an abnormal
condition is confirmed.
When a normal
condition is confirmed.
IC13 (6pin) or CN30 :
Square waveform UART data
Baud rate:
Default: 115.2kbps
After: 3.967Mbps.
When a normal
condition is confirmed.
When an abnormal
condition is confirmed.
When an abnormal
condition is confirmed.
When a normal
condition is confirmed.
Replace the ANT Matching Parts.
When an abnormal
condition is confirmed.
[The MPU or BT IC is faulty]
Replace the PCB.
line circuit is faulty]
condition is confirmed.
When a normal
of 1.8V logic.
Square waveform UART data
IC13 (5 pin) or CN31:
Verify the BT control
When an abnormal
condition is confirmed.
condition is confirmed.
When an abnormal
Replace the IC13.
line circuit is faulty]
When an abnormal
condition is confirmed.
condition is confirmed.
When a normal
When an abnormal
condition is confirmed.
the BT is faulty]
[The 19.2MHz clock circuit for
condition is confirmed.
When an abnormal
condition is confirmed.
When a normal
C52 : Square wave,
Verify the 19.2MHz clock
When an abnormal
condition is confirmed.
[The MPU IC is faulty]
case of abnormal condition.
[The BT IC is faulty]
Replace the PCB.
[The BT IC is faulty]
Replace the PCB.
[The MPU IC is faulty]
Replace the PCB.
Verify the BT control signal (BT_RX)
Replace the CP2.
Summary of Contents for KCH-20R
Page 20: ... No RA027 Rev 001 2 2 MEMO ...
Page 37: ...MEMO ...
