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6.1.3 MD Mechanism Assy Adjustment and Check
1 Temperature Check (Please perform this check soon after the power has been switched on.)
Note: When IC101 (RF-AMP) or IC104 (mechanical controller) has been exchanged or when a correction changing VD+3 has been made, be sure to correctly perform all steps up to step 6.
Step No. 1 Operation Keys and Operation Method Short circuit MECH TEST MODE during the power ON. (Fig.6-1) Press the REC key. When is 80 or more at this time, the adjustment is OK (step 4 and following can be omitted). is 80 (not passed) Measure the ambient temperature T (Â°C) andcheck hat the measuring value ( ) is within the standard in regard to the microcomputer set value ( ). Note: When the indication of the measuring value ( ) is not stable, and the ambient temperature T (Â°C) is 25 Â°C or less, set to the lower value. When the ambient temperature is over 25 Â°C, set to the higher value. TEMP 80 FL Display EJECT Test mode Status Remarks
2 3 When 4
The microcomputer starts measuring. End 80 is the default value (unadjusted).
: Measuring value : Set value
Âµ-com Measuring value Room Temperature [ T (Â°C) ] 11.6 to 16.9 17.0 to 22.3 22.4 to 27.6 27.7 to 33.0 33.1 to 38.4 ( hex= â +1 to +3 0 to +2 â1 to +1 0 to â2 â1 to â3 )
Âµ-com Set value
79 When the 7A microcomputer 7B value is 7C 7D
Change with the F. SKIP key (UP) and the R.SKIP key (DOWN). Power OFF
TEMP 7B 7B EEPROMW Writing to EEPROM is made and return is made automatically from test mode to normal mode.
2 Laser Power Check CAUTION
â¢ Never look directly at the objective lens. Rec power (rpw) is than ten times greater than Playback power (ppw) is released. â¢ Never turn the pickup volume and be careful of touch it. Laser power of pickup has been adjusted in the factory shipping.
Step No. 1 Operation Keys and Operation Method Short circuit MECH TEST MODE during the power ON. (Fig6-1) Press the ENTER key Measure the laser power with an optical power meter. At this time, check that the measuring value (PLAY power) meets the standard value of the table on the right. Note: When the standard value on the right is applied, the numerical value immediately after entry into test mode 2 shall be taken as the standard. FL Display EJECT Test mode Status Remarks Laser Wavelength: 780 nm
2 3 4
ppw ppw ppw
PLAY power output status
Âµ-com Measuring value
hex = ( â ) +02 to +04 â01 to +01 â02 to â04
May be omitted.
Âµ-com Set value
Standard Value (mW) 0.69Â±0.12 0.67Â±0.1 0.63Â±0.1
Press the ENTER key. At this time, check that the measuring value (REC power) meets the standard value of the table on the right.
REC power output status ( hex = â ) +02 to +04 â01 to +01 â02 to â04 Standard Value (mW) 6.18Â±0.93 5.79Â±0.87 5.47Â±0.82
Press the EJECT key.
The LD goes out.