5-11
Accessory Troubleshooting
TP-5672 11/95
S3--4
103
133
TBDC1--33
TBDC1--3
103
S3
TB--DC1
MICROCONTROLLER
TB--AC1
S3--3
133
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
17
ECS
EAS
NCS
NAS
LC
LB
LA
EC
EB
EA
NC
NB
NA
4
3
NO
Wire Code Example
S10--13— 201
Device Name
Wire Number
Device Terminal
Number
5604520
Figure 5-12. Wiring Diagram— Time Delay Override, Option DD-08-D
Troubleshooting The Bypass
Emergency-To-Normal Time Delay
Pushbutton
This section covers the steps to take to verify that
pressing the Bypass Emergency-To-Normal Time Delay
pushbutton will override the emergency-to-normal time
delay.
First ensure through the software that a 10 second
emergency-to-normal time delay is set. While the
emergency source is being used, initiate an
emergency-to-normal time delay by restoring the normal
source. Then press the Bypass Emergency-to-Normal
Time Delay pushbutton.
If after pressing the Bypass Emergency-to-Normal Time
Delay pushbutton the emergency-to-normal time delay is
not bypassed, connect TB-DC1-4 to TB-DC1-34.
1. If grounding TB-DC1-4 causes the emergency-to-
normal time delay to be bypassed but the Bypass
Emergency-to-Normal Time Delay pushbutton is
not operating, check the Bypass Emergency-
To-Normal Time Delay pushbutton and the wiring to
the Bypass Emergency-To-Normal Time Delay
pushbutton.
2. If after grounding TB-DC1-4 the emergency-to-
normal time delay is not bypassed, check the
continuity between P2-4 and TB-DC1-4.
a. Remove power from the logic board.
b. Disconnect the P2 ribbon cable connector from
the power supply board.
c. Using an ohmmeter, connect one test lead to
P2-4 on the power supply board. Connect the
other test lead to TB-DC1-4. If there is an open
circuit, replace the power supply board. If the
resistance is low, the main logic board is bad.
Replace the logic board assembly.
