PT6800 Service Manual
7
56 O
W-DATA Voice announcing data signal
57 O
W-SCLK Voice announcing clock signal
58 O
W-MUTE Voice announcing mute control L: Mute
59 O S-SCK -
60
-
ACC
5V power supply
61 O
S-SI -
62 -
VSS GND
63 O
S-SO -
64 O
S-CS -
65 -
-
-
66
I
PTT
PTT key input L: Transmitting
67
I
H-D3
DTMF data input
68
I
H-D2
DTMF data input
69
I
H-D1
DTMF data input
70
I
H-D0
DTMF data input
71
I
H-DV
DTMF data input
72
I
DN
Encoder switch signal
73
I
UP
Encoder switch signal
74 O
L-AO
LCD control signal
75 O
L-AO
LCD control signal
76 O
L-AO
LCD control signal
77 O
L-AO
LCD control signal
78 O
L-AO
LCD control signal
79 I/O
K1
Keyboard
signal
80 I/O
K1
Keyboard
signal
81 I/O
K1
Keyboard
signal
82 I/O
K1
Keyboard
signal
83 I/O
K1
Keyboard
signal
84 I/O
K1
Keyboard
signal
85 I/O
K1
Keyboard
signal
86 I/O
K1
Keyboard
signal
87 O
LAMP
Backlight control signal H: ON
88
I
BATT
Battery voltage detect
89
I
RSSI
Received signal strength indication detect
90 I BUSY Noise
level
detect
91
I
VOX
Voice control level detect
92 I
CTCSS/DCS
IN
CTCSS/DCS signal input
93
I
PF
Programmable button input
94 -
AVSS GND
95 I MANDOWN MANDOWN signal input L: Valid
96
-
VREF
Connect to power supply
97
-
AVCC
Connect to power supply
98 O
VOX SW VOX power control L: VOX enabled H: VOX disabled
99 O MIC MUTE MIC mute switch L: Mute
100 O HPF
PC
High pass power control L: Scramble enabled H:
Scramble disabled
Table 4.4 Function Description of Semiconductor Components
Position
Mark
Model
Function Description
IC11 PST9140NR
MCU
reset
circuit
IC14
TC75W51FU MIC amplification, limitation, and filtering
IC2 ADF4111
Frequency
synthesizer
IC3
NJM2904
APC, voltage comparison, driving
IC4 TA31136
Rx second local oscillator, second IF
amplification, limitation, demodulation, and
noise amplification
IC5 NJM2902
Rx demodulation signal amplification and
filtering
IC6
AK2346
Audio processing chip
IC7 M30620
MCU
IC8 AT24C256
E
2
PROM, stores channel frequency data,
function setting parameters, and adjusting status
parameters
IC9
TDA8541
Rx audio power amplifier
RD07L
RQA0002
Tx final power amplifier
Q10
DTC144EUA
APC control switch
Q11
2SK508NV
Rx VCO oscillator circuit
Q12
DTA144EE
APC output switch
Q12
DTA144EE
APC control switch
Q13
2SC4116
PLL low pass switch
Q14
2SC4617
VCO power supply filter
Q15
2SC5108
Rx second oscillator frequency multiplier circuit
Q16
DTC144EE
APC control switch
Q17
2SK1829
Rx high power amplifier gain control switch
Q18
3SK318
Rx high power amplifier
Q19
3SK318 First
mixer
Q2
2SC5108
VCO buffer amplifier
Q20
2SC5108
First IF amplifier
Q21
2SC4617
Rx noise amplifier
Q22
DTC144EE
Red LED drive
Q23
DTC144EE
Wideband-Narrowband noise toggle switch
Q24
DTC144EE
Green LED drive
Q25
DTA144EE
Wideband-Narrowband discriminator toggle
switch
Q26
DTA123JE
2T high pass filter control switch
Q29
2SK1824
2T high pass filter control switch
Q3
RD01MUS1
Tx power amplifier drive
Q30
2SC4617
2T high pass filter circuit
Q31
2SC4617
2T high pass filter circuit
Q32
DTC144EE Beat
control
switch
Q33
2SK1824
Rx audio mute switch
Q34
2SK1824
Rx audio output switch, disconnect when
emergency alarm ON.
Q35
DTC144EE
Audio power amplifier control switch
Q36
DTA144EE
MIC amplification unit power switch
Q37
2SK1824
Voice alert switch
Q38
2SA1586
External PTT detect switch
Q39
ST2301 5R
switch
Q4
2SC5108
VCO buffer amplifier
Q40 XC6024B502MR 5V regulated voltage output
Q41
2SC4116
MIC AGC control switch
Q42
DTC144EE
External PTT detect switch
Q43
ST2301 5T
switch
Q44
DTA123JE 5C
switch
Q45 XC6024B502MR 5V regulated voltage output
Q47
2SA1586
MIC AGC control switch
Q48
ST2302
External speaker control switch
Q49
2SC5108
Tx first amplifier
Q5
2SC3356
Tx second amplifier
Q51
2SK1824
Rx audio output switch, connect
when
emergency alarm ON.
Q6
2SK508NV
Tx VCO oscillator circuit
Q7
DTA143TE
Tx VCO control switch
Q8
2SC5108
VCO buffer amplifier
Q9
DTA143TE
Rx VCO control switch
Table 4.5 Function Description of Diodes
Position
Mark
Model
Function Description
D1
HVC131
Tx antenna switch diode
D10 MA2S111
Unlock detect diode
D11 HVC376 Rx VCO oscillation varactor diode
D12
HVC376
Rx VCO oscillation varactor diode
D13
HVC376
Rx VCO oscillation varactor diode
D14 HVC376 Rx VCO oscillation varactor diode
D15
HZU5ALL
APC output voltage limiting diode
D16
MA2S111
VCO power filtering acceleration diode
D17 HSC277 VCO
output
switch
D18 DAN222
Rx second IF filter wideband-narrowband toggle
switch
D19 DAN222
Rx second IF filter wideband-narrowband toggle
switch
Summary of Contents for PT6800
Page 28: ...PT6800 Service Manual 27 Figure 3 PT6800 Main Board Top Layer Position Mark Diagram ...
Page 29: ...PT6800 Service Manual 28 Figure 4 PT6800 Main Board Bottom Layer Position Mark Diagram ...
Page 30: ...PT6800 Service Manual 29 Figure 5 PT6800 Main Board Top Layer Position Value Diagram ...
Page 31: ...PT6800 Service Manual 30 Figure 6 PT6800 Main Board Bottom Layer Position Value Diagram ...
Page 33: ...PT6800 Service Manual 32 Figure 8 PT6800 Key Board Top Layer Position Mark Diagram ...
Page 34: ...PT6800 Service Manual 33 Figure 9 PT6800 Key Board Bottom Layer Position Mark Diagram ...
Page 35: ...PT6800 Service Manual 34 Figure 10 PT6800 Key Board Top Layer Position Value Diagram ...
Page 36: ...PT6800 Service Manual 35 Figure 11 PT6800 Key Board Bottom Layer Position Value Diagram ...
Page 40: ...PT6800 Service Manual 39 Figure 16 KBC 60Q Schematic Circuit Diagram ...
Page 41: ...PT6800 Service Manual 40 Figure 17 PCB Layout 1 ...
Page 42: ...PT6800 Service Manual 41 Figure 18 PCB Layout 2 ...