JVC XV-BP1UB Service Manual page 90

ELECTRICAL TROUBLESHOOTING GUIDE
7-2. DVD-ROM
DVD-ROM operating is abnormal
Is there
TR LQ121 collector voltage input?
(about 2.27V, 25° C)
NO
Is there
TR LQ121 base voltage input?
(about 3.5V)
NO
Is there
TR LQ111 base voltage input?
(about 1.42V)
NO
Check the LIC501 PIN123 output.
YES
Replace the traverse assembly
and scan the pick-up barcode.
Check the main PCB pick-up
interface circuit.
YES
Check the TR LQ121.
YES
Check the TR LQ111.
4-9
NG