Toshiba TLP510E Manual de formação técnica - Página 46
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Imprimir páginaCI005 and CI006 are capacitors to stabilize the fluores-
cent lamp discharging current. After the discharging
starts, CI005 and CI006 limit the flow of the current
with the reactance (X
= 1/wc) of CI005 and CI006.
C
Before the fluorescent lamp turns on, the collector
pulse of QI007 is 70 – 80 V(p-p). The voltage is
stepped up to 420 – 480 V(p-p) by LI002 and applied to
the fluorescent lamp. When a filament is warmed, the
discharging starts and the collector voltage of QI003
becomes approx. 30 V(p-p). The fluorescent tube
voltage at turning on is approx. 120 V(p-p).
ARM SW works as a ON/OFF switch for the camera
power supply. When ARM SW turns on, the power is
supplied to the camera.
The waveforms of each section at operation is shown in
Figs. 9-1-3 and 9-1-4.
9-2. Troubleshooting
9-2-1. Fluorescent does not turn on
Check fluorescent
lamp ON/OFF SW
(SM005)
and ARM SW.
Fluorescent lamp
does not turn on.
Replace
fluorescent lamp.
12V : between pins
5 and 7 of PM01.
Higher than 10V.
QI002 base.
Pulse higher than
25 V(p-p) is developed at
QI003 collector.
Check secondary
side of LI002.
QI003
Collector
voltage
Collector
current
Fluorescent
lamp
voltage
Fluorescent
lamp
current
OK
NG
OK
NO
YES
Lower than 3V.
NO
YES
Check primary
side of LI002.
Fig. 9-2-1
9-2
70 kHz
31V
0
0
Fig. 9-1-3
70 kHz
Fig. 9-1-4
Check power
supply unit.
1.5A
+30V
0V
– 80V
+0.16A
0
– 0.22A