Sanyo DVD-5100 Service Manual page 11

CHECK FLOW AND TROUBLE
(LASER ON/ 8/12 cm identification)
An extract from "GENERAL FLOW"
J
Trayclose/closed
"LASER"
lights.
Pickup returns.
8/1 2 cm identification
I
44
Identifies disk
Sets mode
I I
I
INIT processing
of TC9461
Laser off 20 ms
.
r
Laser on.
Focus search
-"4
SHOOTING
(Laser focus search after initial processing.)
An extract from "GENERAL FLOW"
+
"LASER" lights.
Lowers lens
(approx. 400 ins).
I
m
Pickup returns.
lSpINDLE motor turns on. I
e
8/1 2 cm identification.
FG confirmation
Rotates at a speed of
approx. 0.7 time that of CD
I
I
Q
Turnonpower.
+
"LASER"
hghts.
Pickup returns,
8/1 2 cm identification
o
Identities disk
Sals mode
n
Laser on.
Focus search
T
Automatic afignment
Tracking balance
Focus balance
Focus gain
Tracking gam
RF gam
6
DVO / CD
co
Check VCC2 at pin 36 o; IC501 TA1 254. -
Check for short-circuiting of LASER (excessive current [R51OO],
though protected by fixture)
"LASER" does not light. Check for LASER destruction. If so, check LASER current (R51OO).
Check micon interface (SCB, SCL & SCD)
Check FRST (LASER to be active at LOW).
Check signal FLOW.
Check and trace control signals.
do pickup return operation.
Check SLED voltage and timing. Check limit switch.
)isk does not rotate.
Check SPINDLE voltage and timing.
Check SPINDLE voltage and timing.
)isk rotates at a high speed. Check SPDL FO.
Turn off power at once.
Check SPINDLWSLED servo system.
+
%
Turns on laser.
Lowera Iena.
Rotates SPINDLE at
a speed of twice
that of CD.
Waita for prescribed
number of rotatlona to
be
COrIIDleted.
e
FOCUS OK?
NO
YES
Waita for approx. 500 ma.
~ERON/ 8/12 cm identification
%oblem/symptom
]Check
]Check LASER ON timina and drive transistor voltaae,
er focus search after initial processing.
Problem/symptom lCheck
]Waveform lSchematic diagram preference data
Disk error due to erroneous lCheck disk identifying waveform in LASER mode,
2,(34) - (38) F
{
disk identification (28)-(31) L
Focus servo inactive
Check waveforms up to gfocus ok" with each disk. (34)(35)(37)(38) F
Check pin 43 of IC701 TC9461. 2,(36)
Check DFTN. (40) - (43)
DFTN:normally High, at SCRATCH: LOW C,D,E
Data output normal? CN801 /lC802 C,D,E
Disk unreadable
Check DVD~CD signal (CD/'DVD).
Voltage table
DVD:High, CD: LOW
(44) - (46) (8)
(IC900 pin 1, IC501 pin 35, Q6001 base)
Check SEL signal (must be High when laser is on). (28) - (31 ) L
-1o-
Waveform Schematic diagram Reference data
(18)(19)
L
TA1 254 voltage
table (2)
(28) - (31) L
L
[35) - (37)
1,1'
;44) - (46) A,B Voltage table (4)
{44) - (46) A,B Voltage table (4)