Aiwa CX-NHG2MD, Service Manual

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All the adjustments and checks of the MD block are performed in the test mode.
When “No Adjust” appears on the display, follow sections 1 through 3 to adjust.
1. Temperature Compensation Adjustment
*
Normally, do not perform the temperature compensation adjustment.
If the adjustment value is extensively different, perform the adjustment as given below in a suitable environment for measuring
the correct temperature near the unit.
• Test point: Check the test point on the display.
• Tool: Thermometer
1)
After the MD test mode starts up, press the STOP button to display “ALL SVoFF”.
2) Press the DISPLAY button to display “TEMP = $**”.
3) Press the PAUSE button to display “T + **C + 00”.
4) Put the thermometer near the MD mechanism to measure the room temperature.
5) Check the values of the thermometer and press the B.SKIP button and the F.SKIP button until the value is the same as ** of
the display. Press the ENTER button to store the value.
6) After adjustment, press the STOP button to return the display to “ALL SVoFF”.
*
When “No Adjust” is displayed, perform 1) to 3) and press the ENTER button without changing the adjustment value using the
B/F.SKIP button.
2. Laser Power Adjustment
• Test point: Check the display/Pickup laser output
• Tool: Laser power meter (meters that can measure up to 10 mW)
2-1. Playback Laser Power Adjustment
1) Press the EDIT button in the “ALL SVoFF” state to change the display to “LA READ”.
2) Press the PAUSE button once to display “LASER = $**”.
3) Adjust “LASER=$11” using the B.SKIP and F.SKIP buttons and press the ENTER button.
4) Measure the pickup laser output using the laser power meter and check that it is about 0.68mW.
5) After adjustment, press the STOP button to change the display to “ALL SVoFF”.
2-2. Record Laser Power Adjustment
1) Press the EDIT button three times in the “ALL SVoFF” state to change the display to “LA WRITE”.
2) Press the PAUSE button once to display “LASER = $**”.
3) Adjust “LASER=$9F” using the B.SKIP and F.SKIP buttons and press the ENTER button.
4) Measure the pickup laser output using the laser power meter and check that it is about 6.8mW.
5) After adjustment, press the STOP button to return the display to “ALL SVoFF”.
Note: If the laser power exceeds 7.0 mW, the pickup may be damaged.
3. Automatic Sequence Adjustment (EFB/IVR/FOCUS AGC/TRACKING AGC adjustment)
• Test point: Check the test point on the display.
• Test disk: MDW-74, TGYS-1 or equivalent
3-1. Adjusting the MO Disk
1) Load the MDW-74.
2) Press the MODE button to display “SEL GRV”.
3) Press the MD function button to display “AUTO ADJ”. After adjustment, “DONE” is displayed.
(If the adjustment failed, “FAILED” appears.)
4) After adjustment, press the STOP button to return the display to “ALL SVoFF”.
3-2. IVR, EFB, Focus/Tracking/Sled Gain Check of MO Disk
1) Move the pickup to the center of the disk using the B.SKIP button and F.SKIP button.
2) Press the PLAY button to display “FOCUS ON!”.
3) Press the ENTER button to display “ALL SV ON”.
4) Press the STOP button and press the DISPLAY button twice. Confirm that the values of “I$**: E$
” are within the
range shown below. (hexadecimal)
I$ “**” ................... 03 to 0A
E$ “
” .............. 09 to 15
ELECTRICAL ADJUSTMENT
IVR EFB