Main Unit - Icom IC-7800 Service Manual

2-5

MAIN UNIT

AF power amplifier AF power amplifier
(IC140: LA4485) (IC140: LA4485)
SQL gate SQL gate
(Q100,Q101: 2SJ144) (Q100,Q101: 2SJ144)
AF selection circuit AF selection circuit
(IC100,IC101: TC4W53F) (IC100,IC101: TC4W53F)
ACC AF output circuit ACC AF output circuit
MIC amplifier MIC amplifier
(IC821: NJM2172V) (IC821: NJM2172V)
ALC/APC circuit* ALC/APC circuit
(IC60: NJM2058M) (IC60: NJM2058M)
IF amplifier IF amplifier*
(Q506: 2SK882) (Q506: 2SK882)
1st mixer 1st mixer
(D506: HSB88WS) (D506: HSB88WS)
2nd mixer
2nd mixer
(D505: HSB88WS) (D505: HSB88WS)
IF amplifier IF amplifier*
Q501: 3SK294 Q501: 3SK294
Q504: 2SK882 Q504: 2SK882
3rd mixer 3rd mixer
(IC503: TA4107F) (IC503: TA4107F)
2 - 3
VCA VCA
(IC105,IC180: NJM2172V) (IC105,IC180: NJM2172V)
Head phone amplifier Head phone amplifier
(IC182: TPA6111A2DGN) (IC182: TPA6111A2DGN)
IF input switch* IF input switch
(IC490: TC4W53F) (IC490: TC4W53F)
RF amplifier RF amplifier
(IC820: μPC4094G2) (IC820: μPC4094G2)
Limit amplifier Limit amplifier
(IC230: μPC4570G2) (IC230: μPC4570G2)
YGR amplifier YGR amplifier
(Q801: 2SC5551) (Q801: 2SC5551)
RF amplifier RF amplifier
(Q508: 2SC5501) (Q508: 2SC5501)
*Located under side of the point