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– 9 –
Checks Prior to Parts Replacement and Adjustments
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.
• 0.9 mW power
Specified value : 0.84 to 0.92 mW
• 7.0 mW power
Specified value : 6.8 to 7.2 mW
lop (at 7mW)
• Labeled on the optical pickup
Iop value ± 10mA
• Traverse waveform
Specified value : Below 10% offset
• Error rate check
Specified value : For points a, b, and c
C1 error : Below 220
AD error : Below 2
• Error rate check
Specified value:
a.
When using test disc (MDW-74/AU-1)
C1 error : Below 80
AD error : Below 2
b.
When using check disc (TDYS-1)
C1 error : Below 50
• CPLAY error rate check
Specified value:
C1 error : Below 80
AD error : Below 2
• Unsatisfactory if displayed as T=@@ (##) [NG”
NG
(@@, ## are both arbitrary numbers)
Laser power check
(5-6-2 : See page 28)
Traverse check
(5-6-3 : See page 28)
Focus bias check
(5-6-4 : See page 29)
C PLAY check
(5-6-5 : See page 29)
Self-recording/playback
check
(REC/PLAY)
(5-6-6 : See page 29)
TEMP check
(Temperature
compensation
offset check)
(5-6-1 : See page 28)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the
overwrite head
If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around
D101 (BD board)
• Check the signals around IC101, IC121, CN102,
CN103 (BD board)
Measure if unsatisfactory:
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.
When performing adjustments, use the specified values for adjustments.
Содержание MDS-JA20ES - Minidisc Deck
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Страница 43: ...6 7 PRINTED WIRING BOARDS BD SWITCH Section See page 39 for Circuit Boards Location 47 Page 67 ...
Страница 44: ... 48 6 8 SCHEMATIC DIAGRAM BD SWITCH Section Page 69 ...
Страница 45: ...MDS JA20ES 49 50 6 9 PRINTED WIRING BOARD AUDIO Board Component Side See page 39 for Circuit Boards Location ...
Страница 49: ... 57 6 13 PRINTED WIRING BOARD DIGITAL Section See page 39 for Circuit Boards Location ...
Страница 54: ...MDS JA20ES 65 66 6 17 PRINTED WIRING BOARD POWER Board Component Side See page 39 for Circuit Boards Location ...