Does Not Read Disc; Disc Does Not Rotate; Cd Check Process; Dvd Check Process - Denon DVD-2900 Service Manual

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1.3. Does not Read Disc

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[No PLAY], [00 00] displayed etc.

(1) Disc does not Rotate.

Check the Emission of Pick-up.
• Emission of PU laser O.K.?
* See attached sheet
O.K.
Check Spindle drive signal.
• [DMO]: "H" level?
O.K.
END

(2) CD check process

Check the RF signal.
Check the voltage of Test-Point(TP)
• TP [RFAC]: about 1V
TE
L 13942296513
O.K.
Check Connection.
• [IC502]--[IC503](16MDRAM)
"L"--"H" alternate?
O.K.
END

(3) DVD check process

Check VSTEM. (communication)
• VDT(0--7)_COR,
• XHAC_COR, VEFG_COR,
• XSHD_COR, DCK_COR
"L"--"H" alternate?
O.K.
Check Request Signal
• Request From [B/E] to [F/E]
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[HDRQ_COR]: "L" level?
O.K.
.
END
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N.G.
laser
current check
(Page 10,11)
N.G.
N.G.
p-p.
N.G.
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(1)Check soldering of P.U.
• short-circuit?
(2)Check the circumference soldering of TR501
and TR502.
(3)Check connector insertion
• [P.U.] -- [GU3494] FFC(CX241)
(4)Check soldering.
• [IC501], CXD1881AR
(5)Check soldering.
• [IC508]: FAN8042
Check soldering
• [IC502]: 111--113pin check.
• R599, R601, R666--R669
• [IC505]
Check soldering
• [IC501]: circumference soldering check.
• [IC502]: 65--110pin check.
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Check soldering
• [BD(0-15)], [BA(0-9)], [XLCOS], [XUCAS]
[XMOE], [XRAS], [XMWR].
• [IC502], [IC503]
Check soldering
• [IC502]: 36--49pin
• R621--R633
• R401--411.
Check soldering
• [IC404]
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