Station Cable Continuity Check
Fault Finding
Strata DK40 I&M Spring 1999
9-5
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Ohmmeter Test
Check the continuity of the cable run between the KSU and digital or electronic telephone
with an ohmmeter.
➤ To perform the ohmmeter test
1. Disconnect the DSS console, electronic or digital telephone.
2. At the MDF, place shorting jumper wires between the A and B of pair #1 (green-red),
the A and B of pair #2 (black-yellow) and the A and B of OCA pair #3 (blue-white), for
PEKU/PESU only. (For MDF pin numbers, See Chapter 4 – DK40 Universal Slot PCB
Wiring.)
3. At the modular block, measure the resistance between all wire combinations. The
proper readings are shown in Table 9-3 for digital telephones, DDSSs, DDCBs and
Table 9-4 for electronic telephones and HDSSs.
4. An improper reading indicates an open, crossed or shorted wire. See “Power Supply
Replacement” on Page 2-21
Table 9-2 Station Cable Continuity Check for Electronic Telephone Cables using Voltmeter
From To
Volt ag ePair Wire Colour Pair Wire Colour
1 A Green
1
2ABlack24
2
1BRed2ABlack24
2
1 A Green 2 B Yellow 24
2
1BRed2BYellow24
2
1AGreen1BRed0
2ABlack2BYellow0
3 A White 3 B Blue 0
3AWhite1BRed0
3BBlue1BRed0
3 A White 1 A Green 0
3BBlue1AGreen0
3 A White 2 A Black 0
3BBlue2ABlack0
3 A White 2 B Yellow 0
3BBlue2BYellow0
1
The green-red, black-yellow and white-blue measurements should be within 10% of each other.
2
Nominal voltage—within limits of
±
26.3 ~
±
27.8 VDC while under AC power, polarity depending on voltmeter
lead placements.
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