Read Sony HCD-H991AV / MHC-991AV / MHC-G99AV Service Manual online
— 5 —
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-up
block. Therefore, when checking the laser diode emission, observe
from more than 30 cm away from the objective lens.
the disc reflective surface by the objective lens in the optical pick-up
block. Therefore, when checking the laser diode emission, observe
from more than 30 cm away from the objective lens.
[Switching the channel step 9 KHz/10 KHz]
Press ENTER/NEXT button and POWER button simultaneously
to switch the AM channel step 9 KHz and 10 KHz. Be sure not to
change with carelessness.
to switch the AM channel step 9 KHz and 10 KHz. Be sure not to
change with carelessness.
When the AMS dial is rotated in the clockwise direction, the count
increases in the following order.
J1
increases in the following order.
J1
n J2 n J3.
When rotated in the counterclockwise direction, it decreases in the
following order.
J0
following order.
J0
n J9 n J8.
To exit form the test mode, press the TUNER/BAND , DISPLAY/
DEMO , MENU 2 buttons simultaneously again.
DEMO , MENU 2 buttons simultaneously again.
SECTION 1
SERVICING NOTE
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
TURNS OFF
TURNS OFF
[FL Display Tube, LED All Lit and Key Check mode]
When the TUNER/BAND , DISPLAY/DEMO , and MENU 2
buttons are pressed simultaneously, the FL display tube and LEDs
will all light up. Press any button to enter the key check mode.
When the key check mode is entered, the FL display tube displays
“K 1 J0 V0”. Each time a button is pressed, the counter increases in
the following order, K 2
buttons are pressed simultaneously, the FL display tube and LEDs
will all light up. Press any button to enter the key check mode.
When the key check mode is entered, the FL display tube displays
“K 1 J0 V0”. Each time a button is pressed, the counter increases in
the following order, K 2
n K 3 n K 4.
If buttons already pressed once are pressed again, the counter will
not increase. When the VOLUME knob is rotated in the + direction,
the count increases in the following order.
V1
not increase. When the VOLUME knob is rotated in the + direction,
the count increases in the following order.
V1
n V2 n V3.
When rotated in the – direction, it decreases in the following order.
V0
V0
n V9 n V8.
1 Remove the Case
3 Pull-out the disc tray
2 Turn the cam to the
direction of arrow.
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