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Part 4: Troubleshooting
• 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.
Fig. 4-1
4-2
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