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

2-9

RXPLL-A BOARD

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

2-10 RXPLL-B UNIT

DDS IC [DSP clock] DDS IC [3rd LO]
(IC651: SC-1287) (IC651: SC-1287)
DDS IC [2nd LO] DDS IC [2nd LO]
(IC501: SC-1246A) (IC501: SC-1246A)
VCO [2nd LO] VCO [2nd LO]
(Q541: 2SK210) (Q541: 2SK210)
REF buffer amplifier REF buffer amplifier
(Q30: 2SC5226) (Q30: 2SC4081)
DDS IC [1st LO] DDS IC [1st LO]
(IC101: SC-1246A) (IC101: SC-1246A)
VCO [1st LO] VCO [1st LO]
(Q150: 2SK210) (Q150: 2SK210)
PLL IC PLL IC
(IC201: LMX2306TM) (IC201: LMX2306TM)
VCO circuit [1st LO] VCO circuit [1st LO]
TX/RX LO switch
(D421,D422: MA77)
2 - 6
Mixer Mixer
(D821: HSB88WS) (D821: HSB88WS)
2nd IF amplifier 2nd IF amplifier
IC1503,IC1504 IC1503,IC1504
: NJM5534MD : NJM5534MD
Marker switch Marker switch*
(IC602: TC7S08F) (IC602: TC7S08F)
2nd mixer 2nd mixer
(IC1501,IC1502: 9A41) (IC1501,IC1502: 9A41)
1st mixer [50M RF] 1st mixer [50M RF]
(Q1211,Q1212: MMBFU310) (Q1211,Q1212: MMBFU310) MMBFU310)
1st mixer [HF RF] 1st mixer [HF RF]
(IC1051: SD5400CY) (IC1051: SD5400CY)
50/HF selection switch* 50/HF selection switch
(IC1081: μPG2009TB)
(IC1081: mPG2009TB)
1st IF amplifier 1st IF amplifier
Q1401: 2SC5501 Q1401: 2SC5501
Q1402: 2SC4402 Q1402: 2SC4402
Q1403: 2SC4402 Q1403: 2SC4402
Pre-amplifier* [HF RF] Pre-amplifier [HF RF]
Q1006-Q1008 Q1006-Q1008
:2SC5551 :2SC5551
Pre-amplifier [50M RF] Pre-amplifier* [50M RF]
(Q1209,Q1210: 2SC5551) (Q1209,Q1210: 2SC5551)
*Located under side of the point
Mixer
(D821: HSB88WS)
2nd IF amplifier 2nd IF amplifier
IC1503,IC1504 IC1503,IC1504
: NJM5534MD : NJM5534MD
Buffer amplifier
Marker switch
[SCOPE clock] (IC602: TC7S08F)
(Q601: 2SC4215)
2nd mixer
2nd mixer
(IC1501,IC1502: 9A41)
(IC1501,IC1502: 9A41)
1st mixer [50M RF] 1st mixer [50M RF]
(Q1211,Q1212: MMBFU310) (Q1211,Q1212: MMBFU310)
1st mixer [HF RF] 1st mixer [HF RF]
(IC1051: SD5400CY) (IC1051: SD5400CY)
50/HF selection switch* 50/HF selection switch
(IC1081: μPG2009TB)
(IC1081: mPG2009TB)
1st IF amplifier 1st IF amplifier
Q1401: 2SC5501 Q1401: 2SC5501
Q1402: 2SC4402 Q1402: 2SC4402
Q1403: 2SC4402 Q1403: 2SC4402
Pre-amplifier* [HF RF] Pre-amplifier [HF RF]
Q1006-Q1008 Q1006-Q1008
:2SC5551 :2SC5551
Pre-amplifier [50M RF] Pre-amplifier* [50M RF]
(Q1209,Q1210: 2SC5551) (Q1209,Q1210: 2SC5551)
*Located under side of the point