MX-KA7
1-21
Turn off the power switch and,disconnect the
power cord from the AC OUTLET.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at Pin 5 of IC 611
Finish.
Maintenance of laser pickup
Is the level of
RFOUT under
0.48V
0.1Vp-p?
Replace it.
NO
YES
O.K
Replacement of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to clean
the lens with a alcohol soaked cotton swab.
(2) Life of the laser diode
When the life of the laser diode has expired, the
following symptoms will appear.
1. The level of RF output (EFM output : ampli tude of
eye pattern) will below.
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the
laser power.Since this adjustment should be performed to match the characteristics of the whole optical
block, do not touch the semi-fixed resistor.
If the laser power is lower than the specified value, the laser diode is almost worn out, and the laser pickup
should be replaced.
If the semi-fixed resistor would be adjusted when the pickup operates normally, the laser pickup may be
damaged due to excessive current.
Summary of Contents for CA-MXKA7
Page 23: ...MX KA7 1 23 1 Pin descriptions 2 Block diagram Optical disc ICs BA5936S IC621 ...
Page 35: ...A B C D E F G 1 2 3 4 5 2 1 MX KA7 n Tuner section ...
Page 36: ...A B C D E F G 1 2 3 4 5 2 2 n Main section MX KA7 ...
Page 37: ...A B C D E F G 1 2 3 4 5 2 3 MX KA7 n CD section ...
Page 38: ...A B C D E F G 1 2 3 4 5 2 4 MX KA7 n Amplifier ...
Page 39: ...A B C D E F G 1 2 3 4 5 2 5 MX KA7 n FL Display and CPU Control ...
Page 40: ...A B C D E F G 1 2 3 4 5 2 6 MX KA7 n Power transformer section ...
Page 41: ...A B C D E F G 1 2 3 4 5 2 7 MX KA7 n Block diagram ...
Page 42: ...A B C D E F G 1 2 3 4 5 2 8 MX KA7 n Wiring diagram ...
Page 43: ...A B C D E F G 1 2 3 4 5 2 9 MX KA7 n Main top PWB ...
Page 44: ...A B C D E F G 1 2 3 4 5 2 10 MX KA7 n Main bottom PWB ...
Page 45: ...A B C D E F G 1 2 3 4 5 2 11 MX KA7 n FL Display and CPU TOP ...
Page 46: ...A B C D E F G 1 2 3 4 5 2 12 MX KA7 n FL Display and CPU BOTTOM ...
Page 47: ...A B C D E F G 1 2 3 4 5 2 13 MX KA7 n Power Amp PWB ...
Page 48: ...A B C D E F G 1 2 3 4 5 2 14 MX KA7 n Power trans PWB ...
Page 59: ...3 11 MEMO ...