Icom IC-7800, Service Manual Addendum

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3-7-27 DDS IC (RXPLL-B UNIT; IC101)
67 MUTB
Outputs the 1st LO muting signal to
the RXPLL-B unit.
High : While muting.
68 VB6S
Outputs the 1st LO VCO (VCO6) con-
trol signal to the RXPLL-B unit.
High : While receiving on 45–60 MHz.
70 VB5S
Outputs the 1st LO VCO (VCO5) con-
trol signal to the RXPLL-B unit.
High : While receiving on 30–45 MHz.
71 VB4S
Outputs the 1st LO VCO (VCO4) con-
trol signal to the RXPLL-B unit.
High : While receiving on 22–30 MHz.
73 VB3S
Outputs the 1st LO VCO (VCO3) con-
trol signal to the RXPLL-B unit.
High : While receiving on 15–22 MHz.
74 VB2S
Outputs the 1st LO VCO (VCO2) con-
trol signal to the RXPLL-B unit.
High : While receiving on 8–15 MHz.
75 VB1S
Outputs the 1st LO VCO (VCO1) con-
trol signal to the RXPLL-B unit.
High : While receiving on 0.03–8 MHz.
Pin Port
Description
number name
3-7-29 D/A CONVERTER IC (MAIN UNIT; IC331)
2 AFGVS1
Outputs the AF gain control signal for
sub band (primary control).
3 AFGVS2
Outputs the AF gain control signal for
sub band (secondary control).
4 PHML1
Outputs the main band’s AF gain con-
trol signal for [PHONES] (primary con-
trol).
5 PHML2
Outputs the main band’s AF gain con-
trol signal for [PHONES] (secondary
control).
6 PHSL1
Outputs the sub band’s AF gain con-
trol signal for [PHONES] (primary con-
trol).
7 PHSL2
Outputs the sub band’s AF gain con-
trol signal for [PHONES] (secondary
control).
8 AAFVA
Outputs [ACC-A] AF output level con-
trol signal.
9 AAFVB
Outputs [ACC-B] AF output level con-
trol signal.
12 MAMS
Outputs AM mode selecting signal for
main band.
Low : While selecting AM mode in
main band.
13 SAMS
Outputs AM mode selecting signal for
sub band.
Low : While selecting AM mode in
sub band.
18 AFGVM1
Outputs AF gain control signal for
main band (primary control).
19 AFGVM2
Outputs AF gain control signal for
main band (secondary control).
Pin Port
Description
number name
3-7-28 D/A CONVERTER IC (MAIN UNIT; IC330)
2 MICV
Outputs the modulation level from the
microphone control signal.
3 DRIV Outputs the drive gain control signal.
4 POCV
Outputs the transmit output power
control signal.
5 BNDM
Outputs the operating band control
signal for main band.
6 BNDS
Outputs the operating band control
signal for sub band.
7 SATT
Outputs attenuator control signal to
the SCOPE unit.
8 FANV
Outputs the PA cooling fan control sig-
nal.
18 MODVA
Outputs modulation input level from
[ACC A] control signal.
19 MODVB
Outputs modulation input level from
[ACC B] control signal.
Pin Port
Description
number name
3-7-30 D/A CONVERTER IC (LOGIC UNIT; IC603)
1 METS
Outputs external meter control signal
for sub band.
4 METM
Outputs external meter control signal
for main band.
Pin Port
Description
number name