DV-79AVi
91
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Do the video and
sound come on?
or beeing damaged?
(noisy)
Yes
No
Refer to the section "7.1.6 ERROR DISPLAY".
Indicate the error message.
Carriage does
not move.
(Stepping positioning)
Yes
Yes
• Laser diode
does not light.
• Focus does
not in.
Yes
No
No
Spindle
does not turn.
No
OK
• Check the following connections and drive IC :
DVDM Assy CN104 (4P flexible cable)
Check the Stepping motor signals, IC351-pin 31, 32, 34, 35 and IC601-pin 47, 48.
• Check the +6V and +12V power supply voltage
(If above voltage is not supplied, check the micro-fuse P202 and P301.)
• Check the following connections and drive IC :
DVDM Assy CN105 (12P flexible cable)
Check the Spindle motor signals and IC251-each pins.
• Check the +6V and +12V power supply voltage
(If above voltage is not supplied, check the micro-fuse P202 and P301.)
• Check the following connections :
DVDM Assy - VJKB Assy
DVDM Assy - AJKB Assy
• Check voltage regulator of VJKB Assy IC701-pin 1 (+5V) for Video circuit,
Check voltage and transistors regulator of PS Assy Q3801(+12V), Q3802(-12V),
5V)for audio circuit .
If the voltage is off, check micro fuse of PS Assy IC3801, IC3802.
• Check the interface of 16M SDRAM (IC741) for Eby-chip (IC701) and 64M SDRAM
(IC781) for AV1 (IC751).
• Check digital data of video and audio signals (audio signals: 3 line data, video signals:
8bit data) shown to each schematic diagram and an analog signal line.
In addition, check CLK.
audio system: 22/24MHz, video system: 27MHz
• Check the following connection, IC351, IC101, IC201 :
DVDM Assy CN101 - Pickup Assy (24P flexible cable)
IC351-pin 9, 10, IC101-pin41 and IC201-pin 32, 47 for Focus Drive
• Check the +6V and +12V power supply voltage and SW+5V
(If +6V voltage is not supplied, check the micro-fuse P101 and P102.)
• Check it whether the pickup is defectiveness.
Perform the section "7.1.2 SELF-DIAGNOSIS FUNCTION OF PICKUP DEFECTIVE"
and check the LD current value.
C101 (for DVD LD) and C103 (for CD LD) of DVDM are missing.
• Regarding DVD LD (650nm) :
Check each signals of CN101-pin 17 (PD), pin 18 (LD Drive), IC101-pin 17 and Q101
Regarding CD LD (780nm) :
Check each signals of CN101-pin 17 (PD), pin 16 (LD Drive), IC101-pin 17 and Q102
PD:
P
ower
D
iode (signal output)
