Toshiba TLP510E, TLP510U, TLP511E, TLP511U 9-2. Troubleshooting

9-2

CI005 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 (XC = 1/wc) of CI005 and CI006.

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.

Fig. 9-1-3

Fig. 9-1-4

9-2. Troubleshooting

9-2-1. Fluorescent does not turn on

Fig. 9-2-1

31V

0

0

1.5A

QI003

Collector

voltage

Collector

current

70 kHz

+30V

– 80V

0V

– 0.22A

+0.16A

0

Fluorescent

lamp

voltage

Fluorescent

lamp

current

70 kHz

OK

OK

NO

NG

YES

NO

YES

Replace

fluorescent lamp.

Fluorescent lamp

does not turn on.

12V : between pins

5 and 7 of PM01.

QI002 base.

Pulse higher than

25 V(p-p) is developed at

QI003 collector.

Higher than 10V.

Check fluorescent

lamp ON/OFF SW

(SM005)

and ARM SW.

Lower than 3V.

Check secondary

side of LI002.

Check power

supply unit.

Check primary

side of LI002.

Contents

Main CONTENTS 1. MAIN POWER SUPPLY CIRCUIT 1-1. Description 1-2. Output Control 1-3. Voltage Switching 1-4. Over-voltage Protection 1-5. Over-current Protection 1-6. Overheat Protection 2. LAMP POWER SUPPLY CIRCUIT (LAMP DRIVER) 2-1. Configuration 3-1 3. OPTICAL SYSTEM 3-1. Configuration XGA 1.3 inch 3 plates system 4-1 4. R.G.B. DRIVE CIRCUIT 1024 pixels 1022 1023 1024 1 Sample hold Page 4-2. Operation Description 4-4 Table 4-2-2 Input terminal function description 5. MICROPROCESSOR 5-1. System Outline 5-2 Fig. 5-1-1 System block diagram 5-3 5-2. System Microprocessor 5-3. Power Supply Reset Process 5-4. Non-volatile Memory Control Process 5-5. Remote Control Reception Process 5-6. RS-232C Transmission/Reception Process 5-7. Status Read Process 5-8. Status Display Process 5-9. On-screen Display Process Table 5-8-1 Contents of the status display signals and the logic X: Lighting OFF ( ): Blinking 5-6 5-10. Video System Control Process 5-11. Panel System Control Process 5-12. Drive System Control Process 5-13. Various Display Modes 5-8 5-14. Applicable Signal 5-15. RS-232C Control Method 5-10 Table 5-15-3 RS-232C command list 6-1 6. DIGITAL CIRCUIT Fig. 6-1-1 6-1. Outline Page 6-3 6-2. Each IC Description Fig. 6-2-1 Page 6-5 Fig. 6-2-4 Page 7. VIDEO CIRCUIT 7-1. Circuit Component Page 7-2. Input Signal Switch Section 7-4 Fig. 7-2-2 Internal block diagram of CXA1855Q 7-5 7-3. Video Demodulation Block Fig. 7-3-2 Block diagram of TC9090AN Fig. 7-3-1 Pin configuration of TC9090AN ++ Table 7-3-1 Terminal function of TC9090AN TDA9141 7-6 43 2110 Sand castle pulse Fig. 7-3-5 Block diagram of TDA9141 7-7 Fig. 7-3-7 Block diagram of TDA4665T Table 7-3-2 Terminal function of TDA4665T Fig. 7-3-6 Pin configuration of TDA4665T 7-8 TDA4672 Fig. 7-3-8 Pin configuration of TDA4672 Table 7-3-3 Terminal function of TDA4672 7-9 TDA4672 Fig. 7-3-10 Pin configuration of TDA4780 7-10 Table 7-3-4 Terminal function of TDA4780 Fig. 7-3-11 Block diagram of TDA4780 Page 7-4. RGB Signal Amplification Section 7-13 Fig 7-4-2 Fig. 7-4-3 7-14 7-5. Microprocessor Interface Fig. 7-5-1 7-15 Table 7-5-1 8. CCD CAMERA CIRCUIT (For TLP511) 8-1. Outline Page 9. FLUORESCENT LAMP INVERTER CIRCUIT (For TLP511) 9-1. Operating Description 9-2. Troubleshooting