HYT TC-268, Service Manual

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TC-268/368 Service Manual
8
8 ENC0 I encode Input
9 ENC1 I encode Input
10 ENC2 I encode Input
11 ENC3 I encode Input
12 NC I NC
13 PTT I [PTT] input ,connect RXD
14 TXD O RS-232C output
15 RXD I RS-232C input
16 MONI I [MONI] input
17 SELF I Program L: mode setting
18 CNVSS I Connect VSS
19 RST I Reset input
20 INT0 I Power detection
21 NC I NC
22 XIN I Oscillator(7.3728MHz)
23 XOUT O Oscillator
24 VSS I Grounding
25 SHIFT O Clock frequency deviation H: unlock
26 PABC O MOS FET power H: unlock
27 WNRC O Audio reference sensitivity L: narrow
28 WNTC O Max deviation H: narrow
29 NC I NC
30 SDA I/O EEPROM data cable
31 SCL O EEPROM clock cable
32 UL I PLL unlock detector L: unlock
33 DT O Common data output
34 CK O Common clock output
35 LE O PLL IC H: lock up
36 5MC O Power control except CPU and EEPROM L: unlock
37 AFCO O AF amplifier H: unlock
38 RX O TX/RX VCO H: receive
39 GLED O Green LED control H: light up
40 RLED O Red LED control H: light up
41 SAVE O Battery save control H: Battery save OFF
42 MUTE O Squelch control H: mic squelch L:AF squelch
43 5RC O Receiver power control L: unlock
44 5TC O Transmitter power control H: unlock
45 NC I NC
46 NC I NC
47 NC I NC
48 NC I NC
49 NC I NC
50 NC I NC
51 NC I NC
52 NC I NC
53 NC I NC
54 2TNO O 2-Tone output
55 VCCN O Frequency output
56 APC O TX: auto power control output RX:BPF tune output
57 VCC I CPU power 5V input
58 VREF I Connect with VCC
59 AVSS I Connect with VSS
60 NC I NC
61 NC I NC
62 NC I NC
63 NC I NC
64 TIBI I CTCSS/CDCSS external circuit central point input