• An abnormality occurs on power starter signals (FAN_SW, 5V_SW, ON_15V).
FAN_SW signal (Power-on:H) is output from pin 19 of IC1802 and applied to
the Power Board. It drives the power oscillation circuit and power supply for
the cooling fans in Power Board.
5V_SW signal (Power-on:H) is output from pin 74 of IC301 and sent to
Q3582, then 5VA line is supplied.
ON_15V signal (Power-on:H) is output from pin 72 of IC301 and sent to
Q2501, then 15VL line is supplied.
• An abnormality occurs on Lamp drive signal (LAMP_POW, LAMP_ERR).
LAMP_POW signal (Power-on:H) is output from pin 140 of IC301 and sent to
IC1882 via IC4801.
SCEL signal (Lamp-on:L) is output from pin 4 of IC4801 via IC1881 and sent
to Lamp Ballast Unit through SW8801(Lamp Cover SW).
TXL signal is output from pin 3 of IC1882 and sent to Lamp ballast Unit via
IC1881.
(TXL signal is applied for lamp power control. Lo: Low power, Hi: High power)
RXL signal (Lamp status signal) is output from Lamp Ballast Unit and sent to
pin 4 of IC1882 via IC1881, then LAMP_ERR signal is output from pin 7 of
IC1882 and sent to IC301 via IC1811.
If an abnormality occurred on the lamp ballast unit, RXL signal and
LAMP_ERR signal become "H" and then IC301 shuts down the power supply
circuit.
[Lamp cover switch]
Make sure that the lamp cover is mounted correctly. If not or the lamp cover
removed, the lamp does not light on for the safety. Check the lamp cover and lamp
cover switch (SW8801).
Fig. 4-1
Part 4: Troubleshooting
4-2
Содержание LV-S3E/D78-5423
Страница 2: ...CANON Multimedia Projector LV S3U D78 5422 LV S3E D78 5423 SERVICE SMANUAL ...
Страница 9: ...Part 1 General Information ...
Страница 24: ...Part 2 Repair Information ...
Страница 42: ...Part 3 Adjustment ...
Страница 59: ...Part 4 Troubleshooting ...
Страница 73: ...Part 4 Troubleshooting 4 14 BA7078AF Sync Detector IC5301 BA9743AFV DC DC Converter IC371 ...
Страница 74: ...Part 4 Troubleshooting 4 15 LM4865 Audio Amplifier IC5003 PW168A Scaler Main CPU IC301 ...
Страница 75: ...Part 4 Troubleshooting 4 16 TA1370FG Sync Separator Frequency Counter IC5302 VPC3230D Video Decoder IC101 ...
Страница 76: ...Part 5 Parts Catalog ...
Страница 77: ......
Страница 93: ...Part 6 Electrical Diagrams ...