Power Supply Test; Station Cable Continuity Check; Voltmeter Test - Toshiba Strata DK40 Installation & Maintenance Manual

Fault Finding

Power Supply Test

To test the DK40 power supply see the Power Supply Installation section in
DK40 Installation.

Station Cable Continuity Check

Voltmeter Test

Use a voltmeter to check cable continuity between the DK40 KSU cabinet, digital or
electronic telephone and DSS console. Make tests at the modular block. Refer to
and 9-2.
To perform the voltmeter test
1. Refer to
Wiring
2. Disconnect the digital or electronic telephone, DSS console, HDCB, or DDCB.
3. Using a DC voltmeter, measure between the wires of the two pairs to verify the
readings shown in
electronic telephone ports. The reading will be a plus or minus depending on meter
lead placement.
4. An improper reading indicates an open, crossed or shorted wire.
Replacement" on Page
5. For the MDF-to-telephone (digital or electronic) cable, use an ohmmeter to make a
more precise check.
Table 9-1 Station Cable Continuity Check for Digital Telephone Cables using Voltmeter
From
Pair Wire
1
1
1
1
1
2
1
The green-red, black-yellow and white-blue measurements should be within 10% of each other.
Nominal voltage—within limits of ±26.3 ~ ±27.8 VDC while under AC power, polarity depending on voltmeter
2
lead placements.
9-4
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Chapter 2 – DK40 Installation
for appropriate MDF wiring diagrams.
Table 9-1
Colour
1
A Green
B Red
A Green
B Red
A Green
A Black
and Chapter 4 – DK40 Universal Slot PCB
for digital telephone ports. Refer to
2-21.
Pair
2
2
2
2
1
2
Power Supply Test
Table 9-2
See "Power Supply
To
Wire Colour
A Black
A Black
B Yellow
B Yellow
B Red
B Yellow
Strata DK40 I&M Spring 1999
Chapter 2 –
Tables 9-1
for
Voltage
0
2
24
2
24
0
2
24
2
24