FM540 Service Manual
89
RSSI
I
Receiving filed intensity signal input
90
BUSY
I
Squelch voltage check input
91
VOL_DET
I
VOL_DET
92
PF2
I
PF2
93
PF1
I
PF1
94
AVSS
-
GND
95
TEMP
-
TX temperature detection
96
VREF
-
+5V
97
AVCC
-
+5V
98
W/N
-
W/N switch pin
99
MD
I
Speaker micdata input pin
100
TGSW
O
TX control pin
Chart 3-4 Semiconductor Description
Position Mark Model
Feature Description
IC202
PST9140NR
MCU reset circuit
IC3
MB15E03
Frequency synthesizer
IC4
NJM2904
APC, volatage comparison, driver
IC6
GT3136
Receiver second local oscillator, second IF amplification,
amplitude limiting, demodulation, noise amplification.
IC204
NJM2902
Receiver demodulation signal amplification and filtering.
IC1
M30620
MCU
IC200
AT24C512C
E
2
PROM, stores channel frequency data, feature settings and
modulation status parameters.
IC7
TDA1519C
Receiver audio power amplification
Q12
2SC3356
RX VCO oscillator tube
Q1
2SC5108
VCO buffer amplifier
Page 17 of 99
Summary of Contents for FM540
Page 1: ...FM540 Service Manual FM540 㔤 ሱ䶒 I ...
Page 89: ...FM540Service Manul Figure 2 FM540 01 Top Layer Position Diagram 136 174MHz Page 86 of 99 ...
Page 90: ...FM540Service Manul Figure 3 FM540 01Bottom Layer Position Diagram 136 174MHz Page 87 of 99 ...
Page 101: ...FM540Service Manul Figure 8 FM540KEYTop Layer Position Diagram Page 98 of 99 ...
Page 102: ...FM540Service Manul Figure 9 FM540KEY Bottom Layer Position Diagram Page 99 of 99 ...