CDT CHECKOUT PROCEDURES
CAUTION: These procedures must be performed in the presence of (or by) a Simplex Technical Representative.
Do not apply power to equipment unless the representative is present.
Since the checkout of a 2120 system consists of two phases -
preliminary and final checkout - we’ll break the
CDT checkout up into the same two phases. Perform CDT checkout at the same time as 2120 system checkout.
CDT PRELIMINARY CHECKOUT
CAUTION: ENSURE THAT ALL POWER TO EACH CDT IS OFF BEFORE PROCEEDING.
Note 1: To simplify preliminary COT checkout, group COTS according to the power supply that powers them.
Check out all CDTs associated with the same supply and then proceed to the next group of CDTs.
If a BT or FABT is powered by a CDT supply, check out the CDT supply first and then refer to the
2120 Multiplex System Checkout Procedures (MUX2-21-004) manual for transponder checkout.
Note 2: Perform Steps 1 through 7 for CDT cabinets containing a CDT power supply board (P/N 562-464).
1. Verify that 120VAC is properly terminated at TB2 on the power supply as shown in Figure 4.
Note: If any contractor wiring is connected to TBl of the power supply, proceed to Step 2. If no contractor
wiring is connected to TBI , proceed to Step 4.
FACTORY
WIRED TO
NEARBY
TRANSPONDER
-5 R B R B R B b?
III IIll I
I I I I
GRo”rD ,e
NZEUT
POWER AVAILABLE
FOR ADDITIONAL UNITS
-
12 11 10 9 8 7 6 5 4 3 2 1
3 2 1
I
BACKPLATE
-+-+-+-+-+-+
uuuuuu
FOR BAl7ERY
28VDC 28VDC 28VOC 28VDC 28VDC 28VDC
CDT POWER SUPPLY
562-464; 562-482
THROUGH 562-488
CONNECTED
TO CDT FOR
TROUBLE
REPORTS
u
. P4
,“:
._-.I
g:
8;
88’
CDT Power Supply Terminal Connections
FIGURE 4
(GROUND
SCREW)
NOTES:
R = RED
B = BLACK
2. Disconnect the ground wire connected to TB2-3 of the supply. Then, use your VOM to check for shorts to
ground on any contractor wiring connected at TBl.
Requirement: VOM indicates no shorts between each wire and ground. If this requirement is not met for all
contractor wiring connected at TBl , then troubleshoot and repair the wiring at fault.
3. Check for shorts between each ” +‘I (red) and “-I’ (black) contractor-installed wire connected at TBl on the
power supply.
Requirement: VOM indicates no “ +” to “ -” shorts. If this requirement is not met for each contractor-
installed “ + ” and “ - ”
wire connected at TBl, then check the outgoing wiring for “ +” to “-” shorts. Repair
the wiring as necessary.
6
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