Icom IC-M91D Service Manual Addendum page 17

• RF UNIT
(TOP VIEW)
VCO
2nd IF FILTER
(FI151)
1st IF FILTER
(FI150)
DISCRIMINATOR
(X170)
• RF UNIT
(BOTTOM VIEW)
TX MUTE SW
(Q392)
TX MUTE SW
(Q366)
APC CTRL
(IC150)
BUFFER
(Q50)
IF IC
+5 V REGULATOR
(IC170)
(Q363)
2 - 2
PRE-DRIVER AMP
(Q53)
POWER AMP
(Q54)
1ST IF MIXER
(Q150)
TX POWER DETECTOR
(D91)
RF AMP
(Q90)
BUFFER
(Q3)
+3.3 V REGULATOR
(IC2)
PLL IC
(IC1)
VCC LINE CONTROLLER
(Q353)
WET DETECT
(Q390)
+5 V REGULATOR
(Q225)
+5 V REGULATOR
(Q224)