Trouble Shooting; Fl Tube Doesn’t Light; Check The Set-Up Process Of Panel Μ-Com - Denon DVD-2900 Service Manual

TROUBLE SHOOTING

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1. GU-3494 MAIN PWB
1.1. FL TUBE doesn't light
(1) Check the Set-up process of Panel µ-COM
Check Power Supply Voltages.
• [IC301]:D1,D4
+3.3V_D1, +3.3V_D4
Check Oscillation Waveform.
• [IC301]:
25MHz at 31pin.
Check Reset Signal.
• [IC301]:
"H" level at 35pin?
Check Data Bus between
IC301 and IC302(Flash ROM):
TE
L 13942296513
• Does the level change at FD(0--15)
Pins of IC301
Check Data Bus between
FLD Driver(GU-3496 [IC101])
• [RST]:
"H" level?
Continue to next step.
Check the Set-up process of B/E µ-COM.
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N.G.
Check soldering.
• CY121 on MAIN PWB.
N.G.
Check soldering.
• X301 on MAIN PWB.
N.G.
Check soldering.
• IC303(Reset IC) on MAIN PWB.
N.G.
Check soldering.(short-circuit,open)
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• FD(0--15), PA(1--16), PWE, PCE, POE,
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N.G.
(1)Check soldering of CX171.
(2)GU-3496 is N.G.(No Good).
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