Radio Shack HTX-400, Service Manual

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2
THEORY OF OPERATION
1. SEMICONDUCTORS AND FUNCTION
1.1 IC COMPLEMENT
REF.NO TYPE MANUFACTURER FUNCTION
IC601
IC801
IC802
IC806
IC501
IC3
IC805
IC401
IC803
IC807
IC804
IC808
TK11230AM
TMP87PP21DF
24LC16B
NJM2902V
LV2105V
NJM2073M
FX465DF
TA31136FN
TK11230AM
NJM2904V
XC6371A350PR
AS2801M
TOKO
THOSHIBA
PRO-CHIPS
JRC
SANYO
JRC
MX-COM
TOSHIBA
TOKO
JRC
TORREX
ALPHA
IC-REGULATOR
CPU IC
EEPROM
MIC AMP
PLL IC
AUDIO POWER AMP
CTCSS ENCODER
IC-IF
IC-REGULATOR
TONE AMP
D/D CONVERTOR
IC-REGULATOR
1.2 TRANSISTOR COMPLEMENT
REF.NO TYPE MANUFACTURER FUNCTION
Q101
Q102
Q103
Q104
Q105
Q106
Q201
Q202
Q203
Q305
Q304
Q302
Q303
Q301
Q501
Q601
Q602
Q603
Q604
Q606
Q607
Q801
Q805
Q804
Q810
Q107
MRF9242T1
MMBR951LT1
MMBR951LT1
2SC3356
2SC3356
KTA1001S
2SC4226
2SC4226
KTC4081
KRC104S
2SC3356
MMBR951
MMBR951
KTC3875
KRC410
KRA310
KRA310
KRA310
KRA310
KRC404
KTA2015
KTC3875
KRC104
KRA110
2SJ144
KRC401
MOTOROLA
MOTOROLA
MOTOROLA
NEC
NEC
KEC
NEC
NEC
KEC
KEC
NEC
MOTOROLA
MOTOROLA
KEC
KEC
KEC
KEC
NEC
KEC
KEC
KEC
KEC
KEC
KEC
NEC
KEC
FINNAL RF AMP
DRIVER AMP
PREDRIVER AMP
BUFFER
BUFFER
TX S/W
1'ST AMP
1'ST MIXER
IF AMP
VCO R/TX S/W
VCO OSC
VCO BUFFER
VCO BUFFER
VCO REG
PLL LOCK S/W
RX B+ S/W
SAVE B+ S/W
TX EN1 B+ S/W
TX EN2 B+ S/W
AUDIO MUTE S/W
AUDIO B+ S/W
LAMP S/W
RESET S/W
PTT S/W
RX MUTE S/W
TX S/W