Denon DVD-3930 Service Manual

Also see for DVD-3930: Specification Operating instructions Service manual

Contents

13DVD-3930/3930CI1. Iop checked MethodSelect the laser ON/OFF (CD/DVD) mode of the test mode,and check the lop value of DVD laser or CD laser.(See page 19 for test mode.)1.1. DVD laser current check(1) Press the SKIP REV or SKIP FWD button to display thelaser current value, and then select T22.(2) Check the current value of Iop (nnnn).( : Off, DVD laser, Initial value: mm.mm [mA],Current value: nn.nn [mA])1.2. CD Laser current check(1) Press the SKIP REV or SKIP FWD button to display thelaser current value, and then select T21.(2) Check the current value of Iop (nnnn).( : Off, CD laser, Initial value: mm.mm [mA],Current value: nn.nn [mA])2. Note for Handling the Laser Pick-UpThe protection for the damage of laser diode.If you want to change the optical device unit from any otherunits, you must keep the following.(1) It should be done at the desk already took measures thestatic electricity in care of removing the OPU's (Opticaldevice unit) connector cable.(2) Workers should be put on the "Earth Band".(3) It should be done to add the solder to the short land toprevent the broken Laser diode before removing the 24PFFC cable.(4) Don't touch OPU's connector parts carelessly.3. Replacement of the Laser Pick-up(Traverse Unit)Check the Iop (Laser drive current)If the present Iop (current) value exceeds.+150% of the ini-tial value, replace the Traverse unit (Laser Pick-up) with anew one.