Panasonic Crs 1 Service Manual

							 
    · 
    The Chang e operation is to close one tray each time when CHANGE is pressed. This is the basic operation of auto tray
close. The change operation will stop after detect a signal change in CLOSE-SENSO R while auto tray close count the
numbe r of CLOSE-SENSOR signal change and stop at before selected tray start to move to STOCK position.
If there is a case where user select a upper level tray of current tray in PLAY position to be closed, (e.g. current tray at PLAY
position is tray 4, user select tray 3 to be open), micro-p counting of CLOSE sensor signal must done until tray 4 position, before
motor brake. The reason is to eliminate long waiting time for the next tray closing.
 
    · 
    Below is the timing chart of tray closing (Change Operation):-
 
    · 
    Tray openin g and closing is control by cam gear and CLOSE-SENSOR signal. OPEN-SW is only use for full open operation in
order to get more accurate tray stroke. Figure below show the cam gear rotation direction for tray openin g and closing, and cam
important position.
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    · 
    Below is the flow chart for tray open processing.
 
    · 
    The flow charts below shown the types of tray close processing, for tray auto close processing is use if user select a specify
tray to be close automatically after trays full open.
 
    · 
    Tray change close processing use if use select a function and want to change disc one by one from toptray to bottom tray.
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    · 
    Close all processing is use when user wants to close all trays at once, or want to close tray no.5 or close tray no.4 while tray
no. 5 is at PLAY position.
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    · 
    W hen there is a OPEN/CLOSE button pressed during tray open or tray close operation. Motor will rotate revere direction.
There are 2 type of cases, where 1stis before full open condition (open/close gear assembly still resting) and the 2ndis after
trays full open condition. For the 1stcondition, motor will rotate the cam gear to move between HOME direction and tray open
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							While for the 2ndcase, cam gear inside mechanism will move between specific positions by checking CLOSE-SENSO R signal
change.
 
    · 
    The flow chart for both open reverse (when tray openin g motor reverse) and close reverse (when tray closing motor reverse)
is as below. The operation use when user press OPEN/CLOSE button during tray is openin g or closing.
3.11. Drive tray between STOCK and PLAY position
 
    · 
    Play position is defined as the position whereas the tray is aligned to be played over the CD/ DVD unit. Only a single tray can
be at this location & note that the traverse mechanism is at its clamped position. Play position can be either disc playing (actively
reading disc data) or its not playing (no data reading).
*ShipmentorInitializepositions always finish with a tray at this location.
 
    · 
    Loading operation is process to move trayfrom STOCK position to PLAY position.
 
    · 
    Unloadin g operation is process to move trayfromPLAY position to STOCK position.
 
    · 
    If there is a certain operation key pressed at the middle of movement. The reversal operation is necessary. The reversal
operation should carry out after the tray arriving the STOCK position or PLAY position.
 
    · 
    The flow chart and timing chart for load a disc from STOCK position to PLAY position is as below:
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    · 
    The flow chart and timing chart for unload a disc from PLAY position to STOCK position is as below:
3.12. Selection ofTray by Moving UDbase Up/down
 
    · 
    Tray alignment & selection is achieved by UD (up/down) movement, whereas the Mechanism vertically aligns itself to the
selected tray to be driven to PLAY position or STOCK position. The uppermosttray is defined as tray 1 and bottom most tray
is defined as tray 5. Counting is achieved by resetting during initializ ation to the TOP-SW (tray 1) and counting the signal
change by UD-SENSO R.
 
    · 
    Below are the timing chart for UD base tray selection Up/down:
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    · 
    Tray 1 is the reset position for UD base up/down processing. The position should be unique; a TOP-SW is use in this purpose.
 
    · 
    Below is the flow chart for UD selection processing.
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    For tray 1 selection, flow chart below will be used.
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							3.13. Fail Safe
 
    · 
    Fail safe function is for purpose of recovery of traymovement if the mechanism is not able tocarry out tray open or close within
a specified time.
Fail safe 1: Tray can not open: Fail safe -move all trays to home position
Fail safe 2: Tray can not close: Fail safe -move to next close sensor transition position
Note :For Fail safe 2 :
 1. If done on tray 1 - will fully go to Open position because OC gears are fully engaged
 2. If done on either one of the remaining trays (2, 3, 4 & 5) - will only release the gear engagement and leave the tray at free
condition, tray can only open manua lly by user.
After fail safe, any subsequent button pressed on main set, the mechanism must follow GO HOME flowchart.
 
    · 
    Fail safe flow chart are shown as below:
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							3.14. Manual TriggerTrayClose
 
    · 
    W hen user push open tray at full open position, user may able to activate tray to be all close. This function will be disable if user
happen to press OPEN/CLOSE button and fail safe happen before.
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