PT8100 Service Manual
17
channel again.
B. The CTCSS/DCS signals of both users are
not the same. Please reset it.
C. The radio is out of effective communication
range.
4 No signal A. The antenna is in poor contact. Please fasten
the antenna until secure.
B. The sensitivity is low; please adjust it in the
“Tuning Mode”.
C. The high-frequency amplifying tube Q18 is
broken. Please change it.
D. The squelch level is too high and the squelch
cannot be opened. Please reset the squelch level.
E. The mixing tube Q19 is broken. Please
change it.
F. The FM processing chip IC16 is broken.
Please change it.
5 The
transmitting
red light is
on, but no
voice is
heard by the
recipient.
A. Power module IC1 is broken, so there is no
power output, please change it.
B. The microphone is broken, please change it.
C. The operational amplifier IC13 is broken,
please change it.
6 The
receiving
green light is
on, but no
voice is
heard.
A. The speaker is broken. Please change it.
B. The audio power amplifier IC7 is broken.
Please change a new IC.
C. The switching tube Q33 is broken, please
change a new one.
D. The operational amplifier IC9 is broken,
please change a new IC.
7 Abnormal
programmin
g
A. The programming cable connection is
abnormal, check the cable connection.
B. The RS-232 serial port output of the
computer is abnormal, please check the
computer.
C. The radio’s socket for programming cable is
in poor contact, please check the socket. If
the socket is abnormal, please change it.
Appendix 1 Abbreviations
AMP: Amplify, Amplifier
ANT: Antenna
APC: Automatic Power Control
BPF: Band Pass Filter
CTCSS: Continuous Tone Control Squelch System
DCS: Digital Code Squelch
DEMOD: Demodulation
E
2
PROM: Electrical Erasable Programmable Read Only Memory
HPF: High Pass Filter
IDC: Instantaneous Deviation Control
IF: Intermediate Frequency
LED: Light-Emitting Diode
LNA: Low Noise Amplifier
LPF: Low Pass Filter
MCU: Micro Control Unit
MIC: Microphone
MOD: Modulation
MONI: Monitor
PLL: Phase Lock Loop
PTT: Push-to-talk
RX: Receiver
SPK: Speaker
TCXO: Temperature Controlled Crystal Oscillators
TX: Transmitter
UL: Un-lock
VCO: Voltage Control Oscillator
Appendix 2 Electronic Parts List
No. Part No. Description Qty Position Mark
1 101-08100V-R04 PT8100PCB / FR4, 1.6mm, PT8100V-100325.PCB, ROHS 1
2 102-0MB90F-R01 CPU / MB90F882PMC-GE1,LQFP100,FUJITSU, ROHS 1 IC11
3 102-1509GV-R01 Frequency Divider IC / UPB1509GV, ROHS 1 IC19
4 102-301317-R01 power modules / RA30H1317M, ROHS 1 IC1
5 102-9124NR-R01 Reset IC / SYSTEM,RESET, PST9124NR，ROHS 1 IC14
6 102-A31136-R01 IF(FM) demodulation IC / TA31136FN,SSOP, ROHS 1 IC6
7 102-AT24C5-R01 Memory IC / AT24C512BN-SH25, ROHS 1 IC12
8 102-B15E03-R01 PLL IC / MB15E03SL,PLL,16-PIN,SSOP, ROHS 1 IC3
9 102-FP3502-R01 Voltage regulator IC / XC62FP3502PR,SOT-89, ROHS 1 IC2
10 102-HT9172-R01 DTMF decode IC/ HT9172,SOP, ROHS 1 IC5
11 102-L7808C-R01 Voltage regulator IC / L7808CV, ROHS 1 IC16
12 102-M2902V-R01 Operational amplifier / NJM2902V,OP-AMP, ROHS 4 IC8, IC9, IC10, IC13
13 102-M2904V-R01 Operational amplifier / NJM2904V,OP-AMP, ROHS 1 IC4
14 102-M78L05-R01 Voltage regulator IC / NJM78L05UA，ROHS 1 IC18
15 102-TA7803-R01 Voltage regulator IC / TA78033AF, TOSHIBA, ROHS 1 IC17
16 102-TDA729-R01 AUDIO, AMP IC / TDA7297D,ST, ROHS 1 IC7
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