Hytera TC-508 - Troubleshooting

TC-508 Service Manual
19
CPU Pins
Pin
No. Port Name Pin Name I/O Function
1 NC / / /
2 NC / / /
3 NC / / /
4 NC / / /
5 NC / / /
6 TXD TXD O UART TX
7 RXD RXD I UART Red
8 P60 APA_EN O Control speaker (H: unmute; L: mute)
9 P61 SAVE_CTL O Control Power Save; in non-Power-Save
status, it is at high level.
10 P62 EXT MIC I Check MIC connection (valid for high level)
11 P63 EXT PTT I PTT key on the earpiece (valid for high level)
12 P64 Red LED O Red LED indicator
13 P65 Green LED O Green LED indicator
14 P66 R/T O RX/TX control (H: RX; L: TX) (switch to VCO)
15 P67 RX_CTRL O Control power supply for RX (receive at high
level)
16 Vssd GND S Ground power supply for digital circuit
17 Vddd
VCC（3.0V）
S Power supply for digital circuit
18 P50/INT0 Reserve O Reserved
19 P51/INT1 Reserve O Reserved
20 P52/INT2 Reserve O Reserved
21 P53/INT3 SK2 I Side key2 (programmable) (valid at low level)
22 P54/INT4 SK1 I Side key 1 (programmable) (valid at low level)
23 P55/INT5 PTT I PTT key (valid for low level)
24 P56/INT6 Reserve O Reserved
25 P57/INT7 Reserve O Reserved
26 Vdd_CLD
VCC（3.0V）
S Power supply for digital PA
27 CLD_OUTP CLD_OUTP O Positive output of digital PA