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Repair
204
025-9368H
4.
The Carrier LED
MUST
follow carrier activity on the channel. It must be lit when carrier is
present and extinguished when carrier is absent. If it is always off, the Model 748 will not
function correctly.
5.
The Carrier and DTMF LEDs are hardware controlled. The drive circuits for these LEDs are also
signal inputs to the microprocessor. When trying to troubleshoot an installation, you can use
these as indicators of what information is being provided to the software of the Model 748.
6.
If the unit is non-operational and the AUX LED on the front panel pulses slowly, contact Zetron
Applications for further assistance.
Содержание 748
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Страница 68: ...Operation 54 025 9368H Notes...
Страница 110: ...Programming 96 025 9368H Notes...
Страница 216: ...Feature Set Reference 202 025 9368H Notes...
Страница 219: ...Repair 025 9368H 205 MODEL 7XX AUDIO BLOCK DIAGRAM 006 0077A...
Страница 225: ...Repair 025 9368H 211 MODEL 7XX CONTROL BOARD 008 9793D Schematic Sheet 1 of 5...
Страница 226: ...Repair 212 025 9368H MODEL 7XX CONTROL BOARD SCHEMATIC 008 9793D Sheet 2 of 5...
Страница 227: ...Repair 025 9368H 213 MODEL 7XX CONTROL BOARD SCHEMATIC 008 9793D Sheet 3 of 5...
Страница 228: ...Repair 214 025 9368H MODEL 7XX CONTROL BOARD SCHEMATIC 008 9793D Sheet 4 of 5...
Страница 229: ...Repair 025 9368H 215 MODEL 7XX CONTROL BOARD SCHEMATIC 008 9793D Sheet 5 of 5...
Страница 230: ...Repair 216 025 9368H MODEL 7XX CONTROL BOARD 702 9793D Silkscreen...
Страница 233: ...Repair 025 9368H 219 MODEL 7XX SINGLE E E CARD 008 9794A Schematic...
Страница 234: ...Repair 220 025 9368H MODEL 7XX SINGLE E E CARD 702 9794A Silkscreen...
Страница 236: ...Repair 222 025 9368H MODEL 4XB VOICE CARD 008 9236F Schematic...
Страница 237: ...Repair 025 9368H 223 MODEL 4XB VOICE CARD 702 9236F Silkscreen...
Страница 239: ...Repair 025 9368H 225 MODEL 4XB DIAL CLICK BOARD 008 9242E Schematic...
Страница 240: ...Repair 226 025 9368H MODEL 4XB DIAL CLICK BOARD 702 9242E Silkscreen...
Страница 254: ...Quick Reference 240 025 9368H Notes...
Страница 258: ...Specifications 244 025 9368H...
Страница 259: ...Specifications 025 9368H 245...