Sony IFB-X2000E, Service Manual

Page: 124 / 306

4-6
(4) The lamp does not light up although the standby, analog power, and digital power are output.
(This unit has four circuits each for the lamp power supply and active filter for the lamp power supply. As all of these
circuits are the same, only the circuit of lamp 1 will be described here.)
START
END
YES
NO
YES
NO
NO
NO
YES
YES
Is TP2002 (LAMP 1)
of the M board H (5V)?
No lamp ON signal is output from the
microprocessor side. Check the M board.
Is F7001, R7001, and R7002 open?
Check if IC7201 of the GC board
connected to Q7001, Q7002, R7012,
R7042, R7074, and CN7003 and
R7162 of the GAB board of R7205
are damaged.”
Do Pins 1 to 3 become 140V
when the power is turned on by
inputting AC100V?
Check if IC7201 of the GC board
connected to CN7003 is damaged.
Check the above and confirm
that there is no fault and the
lamp is not lit.
As the lamp power supply or lamp
may be damaged, replace the lamp
power supply or lamp.