9
KMD-44
ADJUSTMENT
TEST MODE
1. To enter test mode
While holding the "FM" key and preset "6" key,
reset the unit. All indication segments are ON at
the beginning of test mode.
2. To relese test mode
Simply reset the unit.
(NOTE) The test mode is not canceled by ACC
OFF, power OFF, momentary power down.
3. MD receiver test mode specification
Pressing the "Track Up" key jumps between
tracks in the following order.
No.7
/
No.2
/
No.13
/
No.23
/
No.30
/
No.34
/
No.7
(Same as the beginning)
Pressing the "Track Down" key jumps to the pre-
vious track to the being played.
Pressing the preset "1" key jumps to No.28
track. Again pressing the preset "1" key jumps
to No.22 track.
4. Audio adjustment
The volume is set to -10dB (which is shown as
30).
Loudness is OFF. CRSC becomes OFF regard-
less of the functional excuse, too.
The BASS/TREBLE and BALANCE/FADER
controls can be set to the full boost/full cut and
full front/full rear and full right/full left respective-
ly by pressing the "Track Up" / "Track Down"
keys.
Sound coordination (system Q) doesn't appear
for the Audio mode feed.
MDS-2500 Service Test Mode
(Manual Adjustment Mode)
In order to adjust the focus bias (balance) of
MDS-2500, automatic adjustment is conducted
at factory and bias value is written on the
E2PROM. When conducting adjustment on the
set, the data in the E2PROM is read. Therefore,
when changing the pickup for servicing, it is
necessary to conduct focus bias adjustment
again. If you are equipped with MDS-2000 AT3
Commander and jitter meter, it is possible to
use automatic adjustment. We have prepared
the service test mode (manual adjustment
mode) in case MDS-2000 AT3 Commander and
jitter meter are not available.
●
Adjustment Procedure
(Note: During the adjustment procedure, be
sure to turn off the power supply to the set.)
1. Pull up the IC11 50pin (LADJ1 (Check
Land L1)) of the X33 Unit to BU5V (Check
Land BU 5).
2. Pull out the Check Land ARF of X33 Unit
and Check Land SAG (Servo GND) using
wires so these can be monitored with an
oscilloscope.
3. Turn the power on the set while resetting
the set.
* Adjustment should be conducted on total of
three places: low-reflection pit and groove of
the recordable disk and high-reflection pit of
the pre-mastered disk.
4. When the disk is loaded, the set enters the
adjustment mode.
●
For Recordable Disk
5. With the "TNo. 1" display, low-reflection pit
beta play mode is entered. The display
section of the time code shows "50."
6. While monitoring ARF with an oscillos-
cope, vary the focus bias with track up and
track down key.
7. In order to calculate the optimum values,
vary UP's and DOWN's and change the
values at which the ARF waves are dis-
turbed or 3T waveform levels goes down
and calculate the center values for these.
For example, if values are 58 for the UP-
side and 46 for the DOWN-side, the center
value 52 would be the optimum value.
8. After obtaining the optimum value, set it to
the value and press manual UP/DOWN
key, which will confir m the value.
(Normally, setting will be made by pressing
on the track UP/DOWN key.)
9. After adjusting the low-reflection pit in 8,
the pickup is automatically sent to the
groove area.
10. With the "TNo. 2" display, the groove beta
play mode is entered.
11. From this point on, it is the same as the
above 6, 7, and 8.
12. After adjustment on the groove area, the
set stops. Eject the disk and the adjust-
ment is complete.
∗
Since there is only TOC area for low-
reflection pit, the play time is about 40
seconds. After the pit area, the set will
enter retry movement, during which
adjustments are not effective.
