Pioneer DV-S755AI Service Manual page 87

5
Carriage does
No
not move.
(Stepping positioning)
Yes
• Laser diode
No
does not light.
• Focus does
not in.
Yes
Spindle No
does not turn.
Yes
Do the video and
No
sound come on?
or beeing damaged?
(noisy)
Yes
OK
5
6
• 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 P101 and P102.)
• Check the following connection, IC351, IC101, IC201 :
DVDM Assy CN101 - Pickup Assy (26P 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 1 (MPD), pin 2 (LD Drive), IC101-pin 15 and Q101
Regarding CD LD (780nm) :
Check each signals of CN101-pin 1 (MPD), pin 7 (LD Drive), IC101-pin 17 and Q102
• 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 P101 and P102.)
• Check the connection between JACB Assy and DVDM Assy.
• Check voltage regulator of JACB Assy IC701-pin 2 (+5V) for Video circuit,
IC102 (+8V, +5V) for Audio circuit.
• 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
Indicate the error message.
DV-757Ai
6
7
MPD: Monitor Power Diode (signal output)
Refer to the section "7.1.6 ERROR DISPLAY".
7
8
A
B
C
D
E
F
87
8