Ring Communications DXC910 User Manual
Page 35
35
DXC910 OPERATIONS MANUAL
2007/05/17
PCB500 INSTALLATION
NFE1643 MODIFICATIONS:
Remove Capacitor on U41 pin 14.
Remove U41
Remove U32
Remove wire U41 pin 15 to ST 6
Remove ST4
Cut ST9
Cut Test Pins TP7 and TP8 ( interfearance with PCB500)
Bend C48 away from U43 ( interfearance with PCB500)
Insert 16 pin IC socket in U41
Insert ST5
Insert ST7
Insert ST8
Disconnect U51 pin 1 from VCC
Disconnect U51 pin1 from U51 pin 28
Connect U51 pin 28 to VCC
Connect U51 pin 1 to Address Line A14 (U32 pin 24)
Replace U51 (Ram) with DS1230 (32Kb)
Replace U50 (EPROM) with 27C256 (32Kb)
Replace R59 with Strap (increase DTMF output in USA)
Strap D15
Place plastic insulator on metal edge next to U41
Insert PCB500 to NFE1643 U32/U41
The Power to the RM5000 must be changed when used with the DXC910.
The Ground in the RM5000 and the Ground to the DNA100 and DAD104 must be common.
Use DC power supply.
Connect Ground (minus) to
TB1 pin 3
Connect +24VDC
to
TB1 pin 4
The Power Switch in the RM5000 will now switch the plus 24V DC instead of the minus.
FINAL STRAP CONFIGURATION:
ST4
ST5
ST6
ST7
ST8
ST9
ST10 ST11
OUT
IN
OUT
IN
IN
OUT
OUT
IN
ADDRESS MAP:
U51
RAM 32K
$0000-$7FFF
U45
DTMF TX
$8400-$87FF
U31
PIA 1
$8800-$8BFF
U30
PIA 2
$8C00-$8FFF
U50
EPROM 32K $A000-$FFFF