Canon D78-5382, Руководство по обслуживанию, Страница: 67 / 126

• An abnormality occurs on the drive signals;
5V_SW signal (Power-on: H) is output from pin 146 of IC301 to Q661, IC65A
through Q301 on the Main board and Q662, Q65B and Q65C on the Power board.
FANDRIVE signal (Power-on: H) is output from pin 14 of IC1804 to IC671 and
IC681 through Q672 and Q682 on the Power board.
LAMP-BST-SW signal (Power-on: H) is output from pin 15 of IC1813 to IC611 on
the P.F. board through Q651 and PC643 on the Power board.
LAMP_POW signal (Power-on: L) is output from pin 2 of IC301 to lamp ballast board
through the lamp switch circuit, IC711, IC721 and IC731.
●
When the POWER indicator (red) is lighting, the symptom indicates that the projector
detected an abnormality in the circuit but is not specified error. Check the following;
• Lamp cannot turn on, check following signals;
LAMP_ERR signal (Error: H) is sent from the lamp ballast board and input to pin 8
of IC1822.
LAMP_POW signal (Power-on: L) is output from pin 2 of IC301 to lamp ballast board
through the lamp switch circuit, IC711, IC721 and IC731.
●
Reset switch
The microprocessor inside the projector may occasionally malfunction and does not
allow any controls. In this case, press the reset switch on the rear panel with a sharp
tool to restart the projector.
Part 4: Troubleshooting
4-2
Fig. 4-1