Check Flow And Trouble Shooting - Sanyo FISHER DVD-1500 Service Manual

CHECK FLOW AND TROUBLE SHOOTING

(Power on)
An extract from "GENERAL FLOW"
Turn on power.
Tray close/closed
"LASER" lights.
Pickup returns.
8/12 cm identification
Identifies disk
Sets mode
INIT processing of TC9461
Laser off 20 ms
Laser on.
Focus search
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
Power on
Problem/symptom
1 Cannot be energised
2 SPINDLE motor runs away.
3 SLED motor runs away.
Tray open/close
Problem/symptom
1 Neither opens nor closes
2 Opens but immediately closes. Check for motor drive input/output.
3 Opens but motor does not stop.Check for motor drive input/output.
4 Loading speed abnormal
Check for connector
and power source.
Check
CN803 (PH5P)
Check for a voltage of 5 V/9 V.
Check for the HRST.
Turn off power at once. Check SPINDLE/SLED servo system.
Check for FLOW signal.
Check and trace control signals.
Turn off power at once. Check SPINDLE/SLED servo system.
Check for FLOW signal.
Check and trace control signals.
Check
Check for motor drive input/output.
Check mechanical switch & its output.
Check for HRST & FRST.
Check mechanical switch & its output.
Check mechanical switch & its output.
Check for motor drive input/output.
(Tray open / close)
An extract from "GENERAL FLOW"
Turn on power.
Tray close/closed
"LASER" lights.
Pickup returns.
8/12 cm identification
Identifies disk
Sets mode
NIT processing of TC9461
Laser off 20 ms
Laser on.
Focus search
Waveform Schematic diagram Reference data
(17)(19)
(44)(45)
(46)
(47)(48)
Waveform Schematic diagram Reference data
(1)
(16)
(18)(19)
(1)
(16)
(1)
(16)
(1)
- 9 -
Depress open/close
switch.
Tray opens.
Place a disk
on tray.
Depress open/close
switch.
Tray open/close
K
BA6849 voltage table (4)
A , B
A , B
I BA5931 voltage table (5)
J BA5931 voltage table (6)
J
J
J BA5931 voltage table (6)
J
J BA5931 voltage table (6)
J
J BA5931 voltage table (3)