11.1.2. Control Section
1) AC-DC Inverter Function
The AC input voltage is rectified and smoothed by D10-13 and C5. The obtained DC voltage is converted into a rectangular wave
by the switching transistor Q1, then isolated and transduced by T1. This converted rectangular wave is rectified and smoothed by
D101 and C101 to output DC27V. The DC27V is transmitted to the primary side by PC1 and then PWM- controlled to keep
constant. The switching frequency of Q1 is approximately 60KHz.
2) DC-DC Inverter Function
The DC 27V DC is converted into a rectangular wave by control IC201, and then output as an output voltage of +15V by the
smoothing circuit which is composed of D201, L201, C201.
The 27V DC is converted into rectangular wave by control IC301 and then output as an output voltage of +3.3V by the smoothing
circuit which is composed of D301, L301, C301.
3) Battery back up function
This back up battery adaptor circuit has DC supply function, from battery (+24V) to service unit and DC charge from service unit
to battery (+24V). Charge current is typ. 0.3A.
11.2. CO INTERFACE CIRCUIT
11.2.1. Composition
This is composed of the following circuit:
1) Bell signal detection
2) DC loop formation circuit
3) Pulse dial transmission circuit
4) CALL ID interface circuit
5) COL bidirectional amplifier circuit
1) Bell signal detection
When CO line is idle, photo coupler PC1, PC2 are OFF.
When there is an incoming signal from CO line, the current flows PC1 as in the following way.
Tip
→
L1
→
R2
→
PC1(1-2)
→
C3
→
R5
→
L1
→
Ring: This cause pin4 of PC1 to change the level from High to low.
Ring
→
L1
→
R5
→
C3
→
PC2(1-2)
→
R2
→
L1
→
Tip: This cause pin4 of PC2 to change the level from High to low.
21
KX-TEA308NE
Содержание KX-TEA308NE
Страница 5: ...1 2 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 5 KX TEA308NE ...
Страница 6: ...6 KX TEA308NE ...
Страница 12: ...6 NAMES AND LOCATIONS 7 CONNECTION 7 1 SERIAL INTERFACE CONNECTION 12 KX TEA308NE ...
Страница 15: ...9 BLOCK DIAGRAM 9 1 SYSTEM BLOCK DIAGRAM 15 KX TEA308NE ...
Страница 27: ...27 KX TEA308NE ...
Страница 38: ...12 TROUBLESHOOTING GUIDE 12 1 NO OPERATION Check POWER SUPPLY BOARD MAIN BOARD and 2AP BOARD 38 KX TEA308NE ...
Страница 39: ...12 2 NO DIAL TONE 39 KX TEA308NE ...
Страница 40: ...12 3 CANNOT DIAL 40 KX TEA308NE ...
Страница 42: ...12 7 CANNOT SEND DTMF DIALING 12 8 CANNOT RECEIVE CALL DIAL TONE 42 KX TEA308NE ...
Страница 43: ...12 9 CANNOT SEND A HOLD ON MUSIC 43 KX TEA308NE ...
Страница 47: ...14 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 47 KX TEA308NE ...
Страница 49: ...16 FIXTURES AND TOOLS 49 KX TEA308NE ...
Страница 50: ...17 CABINET AND ELECTRICAL PARTS LOCATION 50 KX TEA308NE ...
Страница 51: ...18 ACCESSORIES AND PACKING MATERIALS 51 KX TEA308NE ...
Страница 65: ...65 KX TEA308NE ...
Страница 92: ...23 KX TE82460NE 2 PORT DOORPHONE CARD 92 KX TEA308NE ...
Страница 93: ...23 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 93 KX TEA308NE ...
Страница 105: ...24 KX TE82492NE 2 CHANNEL VOICE MESSAGE CARD 105 KX TEA308NE ...
Страница 106: ...24 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 106 KX TEA308NE ...
Страница 110: ...24 5 TROUBLESHOOTING GUIDE 24 5 1 PBX cannot work 110 KX TEA308NE ...
Страница 111: ...24 5 2 Cannot Erase 24 5 3 Cannot Record Playback 111 KX TEA308NE ...
Страница 113: ...24 7 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 24 8 ACCESSORIES AND PACKING MATERIALS 113 KX TEA308NE ...
Страница 119: ...25 KX TE82493NE 3 PORT CALLER ID CARD 119 KX TEA308NE ...
Страница 120: ...25 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 120 KX TEA308NE ...
Страница 125: ...Pin No Pin Name I O Description 72 Out Reserve 73 Out Reserve 74 Out Reserve 75 Out Reserve 125 KX TEA308NE ...
Страница 126: ...25 7 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 25 8 ACCESSORIES AND PACKING MATERIALS 126 KX TEA308NE ...
Страница 133: ...26 KX A227X BACK UP BATTERY CABLE 133 KX TEA308NE ...
Страница 134: ...26 1 ACCESSORIES AND PACKING MATERIALS 134 KX TEA308NE ...