Panasonic BRS1D Service Manual ▷ View online
13
3.4.
Fail Safe Mode
* Fail safe is a function for recovery of tray movement if mechanism cannot carry out tray open or close within a specified time.
Below are the fail safe specification at each position. Refer to table 2.
Below are the fail safe specification at each position. Refer to table 2.
Fail Safe specification
Close position
move to Open position→
Open position
move to Close position→
Close position
Locked at
Motor CCW
condition
( in the case
motor can turn
CW)
Moror CCW for 5sec
(Time out)
↓
Motor CW to Open position
Locked at
Motor CCW
condition
( in the case
motor can not
turn CW)
Moror CCW for 5sec (TO)
↓
Motor CW for 5sec (TO)
↓
Loop
↓
ERROR stop (at 4th TO)
Locked at
Motor CW
condition
( in the case
motor can turn
CCW)
Moror CW for 5sec
(Time out)
↓
Motor CCW to Close
position
Locked at
Motor CW
condition
( in the case
motor can not
turn CCW)
Moror CW for 5sec (TO)
↓
Motor CCW for 5sec (TO)
↓
Loop
↓
ERROR stop (at 4th TO)
Fail Safe
state
Table 2
14
4 Disassembly and Assembly Instructions
Caution Note:
• This section describes the disassembly and/or assembly procedures for all major printed circuit boards & main compo-
nents for the unit. (You may refer to the section of “Main components and P.C.B Locations” as described in the service
manual)
manual)
• Before carrying out the disassembly process, please ensure all the safety precautions & procedures are followed.
• During the disassembly and/or assembly process, please handle with care as there may be chassis components with
• During the disassembly and/or assembly process, please handle with care as there may be chassis components with
sharp edges.
• Avoid touching heatsinks due to its high temperature after prolong use. (See caution as described below)
• During disassembly and assembly, please ensure proper service tools, equipments or jigs is being used.
• During replacement of component parts, please refer to the section of “Replacement Parts List” as described in the ser-
• During replacement of component parts, please refer to the section of “Replacement Parts List” as described in the ser-
vice manual.
• Select items from the following indexes when disassembly or replacement are required.
• Replacement of Tray
• Replacement of Traverse Unit
• Replacement of Traverse Slide Plate
• Replacement of Belt, Pulley Gear & Driver Gear
• Replacement of Loading P.C.B.
• Replacement of Loading Motor
• Replacement of Traverse Unit
• Replacement of Traverse Slide Plate
• Replacement of Belt, Pulley Gear & Driver Gear
• Replacement of Loading P.C.B.
• Replacement of Loading Motor
15
4.1.
Flow Chart
4.1.1.
Disassembly flow chart
Below describes the disassembly flow for the mechanism.
4.1.2.
Assembly flow chart
Below describes the assembly flow for the mechanism.
16
4.2.
Disassembling Procedures
Caution : Refer to 2.4 “Handling Precaution for Traverse
Unit” to prevent static damage to the Optical Pickup unit
Unit” to prevent static damage to the Optical Pickup unit
4.2.1.
Replacement of Tray
Step 1 : Use a pin to Slide the Traverse Slide Plate until it come
to a stop.
to a stop.
Step 2 : Slide the tray out fully.
Step 3 : Release the catches & remove the tray.
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