Icom IC-V82, Service Manual

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PIN
NUMBER
PORT
NAME
DESCRIPTION
70 PLLSTB Outputs PLL strobe signal.
71 AFON
Outputs AF regulator (Q15, Q16)
control signal.
HIGH : While emitting audio
72 DUSE
Outputs LPF cut-off frequency control
signal to the CTCSS switch (Q38).
LOW : When CTCSS or no signal-
ing system is in use.
HIGH : DTCS is in use.
73–76 KR0–KR3 Input ports for keypad.
78 UNLK Input port for PLL unlock signal.
79 EMPHASIS
Outputs emphasis switch (Q73) con-
trol signal.
HIGH : During FM mode operation.
80 T5C
Outputs T5 regurator (Q22) control
signal.
LOW : While transmitting
81 DEGI_W
Outputs detect circuit (Wide/Narrow)
switch (Q53) control signal.
HIGH : During narrow mode operation.
82 R5C
Outputs R5 regulator (Q21) control
signal.
LOW : During receive
83 TXC
Outputs RF output power control
signal.
LOW : During transmit
86–90 KS0–KS4 Output ports for keypad.
92 PS5C
Outputs PS5 regulator (Q54) control
signal.
LOW : Power saved
97, 98 DICK, DIUD Input port for [VOL] control (S801).
141 TONE
Outputs DTMF, BEEP, 1750 Hz tone
signals, etc.
4-6-2 D/A CONVERTER (IC10)
PIN
NUMBER
PORT
NAME
DESCRIPTION
2 T1
Outputs the tunable BPF tuning signal.
The output signal is applied to BPF (D9,
D11, D12).
3 T2
Outputs the tunable BPF tuning signal.
The output signal is applied to BPF (D11,
D12).
1 0 T3
• Outputs the tunable BPF tuning signal.
The output signal is applied to BPF
(D65).
• Output port for transmit output power
setting signal. The output signal is
applied to the APC amplifier (IC3, pin 3).
1 1 VOLOUT
Outputs AF output signals to the AF ampli-
fier (IC5).
1 3 DTCS
Input port for DTCS signal from the DTCS
amplifi er (IC23).
1 5 FC Outputs reference frequency control voltage.
2 2 MOD
Outputs modulating audio signal to the
modulator circuit (D61).
2 3 SQLIN
Outputs squelch control signal to the noise
active filter (IC2, pins 7, 8; R86–R88,
C121, C122).
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