Icom IC-7800 Service Manual Addendum page 368

3-7-27 DDS IC (RXPLL-B UNIT; IC101)
Pin Port
number name
Outputs the 1st LO muting signal to
the RXPLL-B unit.
67 MUTB
High : While muting.
Outputs the 1st LO VCO (VCO6) con-
trol signal to the RXPLL-B unit.
68 VB6S
High : While receiving on 45–60 MHz.
Outputs the 1st LO VCO (VCO5) con-
trol signal to the RXPLL-B unit.
70 VB5S
High : While receiving on 30–45 MHz.
Outputs the 1st LO VCO (VCO4) con-
trol signal to the RXPLL-B unit.
71 VB4S
High : While receiving on 22–30 MHz.
Outputs the 1st LO VCO (VCO3) con-
trol signal to the RXPLL-B unit.
73 VB3S
High : While receiving on 15–22 MHz.
Outputs the 1st LO VCO (VCO2) con-
trol signal to the RXPLL-B unit.
74 VB2S
High : While receiving on 8–15 MHz.
Outputs the 1st LO VCO (VCO1) con-
trol signal to the RXPLL-B unit.
75 VB1S
High : While receiving on 0.03–8 MHz.
3-7-28 D/A CONVERTER IC (MAIN UNIT; IC330)
Pin Port
number name
Outputs the modulation level from the
2 MICV
microphone control signal.
3 DRIV Outputs the drive gain control signal.
Outputs the transmit output power
4 POCV
control signal.
Outputs the operating band control
5 BNDM
signal for main band.
Outputs the operating band control
6 BNDS
signal for sub band.
Outputs attenuator control signal to
7 SATT
the SCOPE unit.
Outputs the PA cooling fan control sig-
8 FANV
nal.
Outputs modulation input level from
18 MODVA
[ACC A] control signal.
Outputs modulation input level from
19 MODVB
[ACC B] control signal.
Description
Description
3-7-29 D/A CONVERTER IC (MAIN UNIT; IC331)
Pin Port
number name
2 AFGVS1
3 AFGVS2
4 PHML1
5 PHML2
6 PHSL1
7 PHSL2
8 AAFVA
9 AAFVB
12 MAMS
13 SAMS
18 AFGVM1
19 AFGVM2
3-7-30 D/A CONVERTER IC (LOGIC UNIT; IC603)
Pin Port
number name
1 METS
4 METM
3 - 24
Description
Outputs the AF gain control signal for
sub band (primary control).
Outputs the AF gain control signal for
sub band (secondary control).
Outputs the main band's AF gain con-
trol signal for [PHONES] (primary con-
trol).
Outputs the main band's AF gain con-
trol signal for [PHONES] (secondary
control).
Outputs the sub band's AF gain con-
trol signal for [PHONES] (primary con-
trol).
Outputs the sub band's AF gain con-
trol signal for [PHONES] (secondary
control).
Outputs [ACC-A] AF output level con-
trol signal.
Outputs [ACC-B] AF output level con-
trol signal.
Outputs AM mode selecting signal for
main band.
Low : While selecting AM mode in
main band.
Outputs AM mode selecting signal for
sub band.
Low : While selecting AM mode in
sub band.
Outputs AF gain control signal for
main band (primary control).
Outputs AF gain control signal for
main band (secondary control).
Description
Outputs external meter control signal
for sub band.
Outputs external meter control signal
for main band.