Panasonic SA-HT640WPL, Руководство по обслуживанию

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20.1.2. Initialis ationand playability
c) C heck SD RA M , E EP RO M a nd Fla sh RO M fo r s old er
*Compare the above w ith OK condition Module
3) Distorted picture or
abnormal sound is heard
during initialisation
2) Picture black and white
only
4) No TO C/Long TO C
5) Disc not spinning
6) Trav erse not mo ving
7) Trav erse and spindle
abnormal mo ve me nt
8) Cannot read disc but
spindle is spinning
- Cannot read CD
- Cannot read DVD
9) Block noise during play
10) DVD Audi o no audio
output
11) No audio
a) Ch eck SD RA M addresand data bus, CL K and other
control signals w av eform
b) Che ck vide o s ign als
c) C heck au dio DA C ci rc uit ry
*Compare the above w ith OK condition Module
a) C he ck mo tor d riv er c irc uitr y ( vo lta ge s)
b) C he ck la se r dri ve circ uit ry (vol ta ge s a nd cu rren t)
c) C heck LS I co nn ectio n t o m oto r d riv e circ uit ry
*Compare the above w ith OK condition Module
a) C heck con nect io n f ro m B ack end M od ule to
b) C heck mo to r d riv er ci rc uit ry on vo lta ges an d co ntr ol
sig na ls
Tra ver se un it
a) C he ck la se r dri ve circ uit ry (vol ta ge s a nd cu rren t)
- Che ck CD la se r dr ive
- C he ck DVD la se r d riv e
*Check voltages and LD current and compare with
OK Module
a) Che ck SD RA M a ddr es s a nd data bus s ign al
*Com pa re th e a bo ve wit h O K c ondi tio n M odul e
a) C PP M k ey do wn lo ad NG , ch eck t es t p oin t f or
CP PM ke y d ow nlo ad
*C he ck fo r t es t p oin t d am ag ed or b ro ke n pattern
a) Ch eck audio sig nal
IC 8421 (5.1ch), IC 8420 (2.1ch)
b) Check audio D AC control signals
IC 8051
IC 8111, IC 8151
LB8302
LB8304 , LB8305
LB8301, R8321, R8322, LB8302, R8325, R8326
IC 8421
*Check f or solder short and/or component
missing/damaged
IC 8251
Q8550, Q8 551, Q 8552, Q 8560, Q 8561, Q 8562
IC 8001
*Check f or solder short and/or component
missing/damaged
FP8251, FP8531, IC 8251
M +9V = FP 8101 (P IN 5/7) , I C8251 ( PIN 21)
*Check f or solder short and/or component
damaged
Q8550, Q8551, Q8 552, Q 8560, Q 8561, Q 8562
Q8550, Q8560, Q8 561, Q 8562
Q8550, Q8551, Q8 552, Q 8560
*Check f or solder short and/or component
missing/damaged
IC 8051
*Check f or solder short and/or component
damaged
a) Che ck su pply v olt ag es (3 .3 V a nd 1. 2V)
sh ort .
a) Check C (chrom a) signal if using Composite or S- Video
b) Check Pb & Pr signal if using Component
1) No DV D lo go sc re en
saver
(IC8421 / I C8420) Pin 5 , 6 , 7 & 8
(SURL / SURR / CEN / SW )
LB 8427 , LB 8428 , LB 8429 , LB 8431
*Check f or component damaged
(MIXL / MIXR / FL / FR )
LB 8421 , LB 8422 , LB 8425 , LB 8426
c) Ch eck Z ero Flag and A-Mute sig nal
*Com pa re th e a bo ve wit h O K c ondi tio n M odul e
QR8420 , LB8424
*Check f or solder short and/or component
missing/damaged
b) Che ck vide o s ign als es pec ia lly Lu mina nce ,Y sig na l LB8301, R8321, R8322
IC 8051, IC 8611, IC 8651
b) C he ck EEP RO M IC 86 11
Prob lems
Checking P oin ts
Ch ecking components
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SA-HT640W PL