Flash Technology FTB 312-3, Reference Manual

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3-12 Revision13 — 02-20-2001 FTB 312 and FTS 316
Troubleshooting the System
Effective troubleshooting begins with careful
observations of operating behavior, often leading
directly to the cause of a problem. Diagnostic pro-
cedures in this subsection are divided into two
categories: unit level, originating in a single unit;
and system level, problems affecting all units in a
multiple-unit system in the same way. However,
in a multiple-unit system some unit-level mal-
functions could cause problems involving the
entire system.
For example, if one light in a multiple-unit system
fails to flash, Table 3-4 directs you to Table 3-5,
the troubleshooting guide for a unit-level problem
(but not a system-level problem).
For each symptom, the troubleshooting guides list
one or more probable causes in descending order
of probability. Continuing with our example,
assume that the light fails to flash during the day
(No in column 1) and at night (No in column 2).
High voltage is absent (No in column 3), but low
voltage is present (OK in column 4). This condi-
tion is described in the fourth row of Table 3-5.
The last column lists possible causes. The most
probable cause is a shorted capacitor, the second
most probable cause is a shorted flashhead cable,
and so on.
When you trace a problem to a specific compo-
nent, see Section Power Converter Component
Testing and Section Component Removal and
Replacement, in this Section.
Setup to Check
Red Alarm for Night
Operation
Response — LEDs and Structure Lights
1) Place the opaque cover
over the PEC.
2) Set the intensity select
switch or switches to
AUTO.
3) Remove power.
4) Disconnect the black
wire from TB2-4.
5) Reapply power.
The following responses denote a light failure
during normal nighttime operation. Verify that
they occur as compared to those in Check Nor-
mal Daytime Operation, except for those in the
following list (after three flash cycles):
•
The DAY MODE LED (I 5) is off.
• The NITE MODE LED (I 10) is on.
• The WHT ALM LED (I 8) is on.
• The RED ALM LED (I 13) is on. (The power
converter cycles executes 3 internal flash
cycles before turning on the Red Alarm.)
• The SYNC LED (I 6) flicks on regularly.
• The CONF (flash confirm) LED
(I 11) is off.
These denote a light failure during nor-
mal nighttime operation.
NOTE: If you leave the system on, it
will next attempt to flash in white night
backup mode(default).
Remove power.
Reconnect the black wire to TB2-4.
Reapply power.
Remove cover from photocell.
Verify operation as in Daytime Opera-
tion.
Reapply power.
Table 3-3 Checkout of Power Converters with PCB1 24747xx Board (Continued)
Table 3-4 Selecting the Correct Troubleshooting Guide
Single-Light
System
Multiple-Unit System
Units Affected Differently, Usually
Only One Failing Unit
A Unit-Level Problem
All Units Affected the Same Way
A System Level Problem
Troubleshooting
Guide
Table 3-5 Table 3-5 Table 3-6