Rxpll-A Unit; Rxpll-B Unit - Icom IC-7800 Service Manual Addendum

2-10 RXPLL-A UNIT

DDS IC [3rd LO]
(IC651: SC-1287)
DDS IC [2nd LO]
(IC501: SC-1246A)
VCO [2nd LO]
(Q541: 2SK210)
REF buffer amplifier
(Q30: 2SC4081)
DDS IC [1st LO]
(IC101: SC-1246A)
VCO [1st LO]
(Q150: 2SK210)
PLL IC
(IC201: LMX2306TM)
VCO circuit [1st LO]
TX/RX LO switch
(D421, D422: MA77)

2-11 RXPLL-B UNIT

DDS IC [DSP clock]
(IC651: SC-1287)
DDS IC [2nd LO]
(IC501: SC-1246A)
VCO [2nd LO]
(Q541: 2SK210)
REF buffer amplifier
(Q30: 2SC5226)
DDS IC [1st LO]
(IC101: SC-1246A)
VCO [1st LO]
(Q150: 2SK210)
PLL IC
(IC201: LMX2306TM)
VCO circuit [1st LO]
2 - 6
Mixer
(D821: HSB88WS)
2nd IF amplifiers
IC1503, IC1504
: NJM5534MD
Marker switch*
(IC602: TC7S08F)
2nd mixer circuit
(IC1501, IC1502: 9A41)
1st mixer circuit [50M RF]
(Q1211, Q1212: MMBFU310)
1st mixer [HF RF]
(IC1051: SD5400CY)
50/HF selection switch*
(IC1081: µPG2009TB)
1st IF amplifier circuit
Q1401: 2SC5501
Q1402: 2SC4402
Q1403: 2SC4402
Pre-amplifiers* [HF RF]
Q1006-Q1008
:2SC5551
Pre-amplifiers* [50M RF]
(Q1209, Q1210: 2SC5551)
*Located under side of the point
2nd IF amplifiers
IC1503, IC1504
: NJM5534MD
Buffer amplifier
[SCOPE clock]
(Q601: 2SC4215)
2nd mixer circuit
(IC1501, IC1502: 9A41)
1st mixer circuit [50M RF]
(Q1211, Q1212: MMBFU310)
1st mixer circuit [HF RF]
(IC1051: SD5400CY)
50/HF selection switch*
(IC1081: µPG2009TB)
1st IF amplifier circuit
Q1401: 2SC5501
Q1402: 2SC4402
Q1403: 2SC4402
Pre-amplifiers* [HF RF]
Q1006-Q1008
:2SC5551
Pre-amplifiers* [50M RF]
(Q1209, Q1210: 2SC5551)
*Located under side of the point