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CD PLAYER ADJUSTMENTS
(2) Checking the "eye" pattern
1. Switch "ON" the POWER.
2. Connect an oscilloscope to TP1 (RF) and TP4 (VC).
3. Load the test disc.
4. Press the PLAY button.
5. Check to be sure that the "eye" pattern is at the center of
waveform and that the diamond shape is clearly defined.
6. Press the STOP button.
7. Turn off the POWER switch.
TAPE ADJUSTMENTS
1. Azimuth Adjustment
• Be sure to clean the heads before attempting to make any adjustment.
• Be sure both channels (1 and 2) are the same level.
(Using a dual-channel oscilloscope)
• Be sure both channel's waveform are same for the phase matching.
• After completion of the adjustment, use the threadlock (TB-1401B) to
secure the azimuth adjustment screws.
1. Remove the cover deck as Fig.1.
2. Load a test tape (VTT-738 etc. : 10kHz) in the Deck.
3. Press the PLAY button. (Normal playback)
4. Use a + tip screwdriver to turn the screw for normal azimuth
adjustment so that the left and right outputs are maximized at
the same phase during normal playback. See Fig.2.
5. Adjust so that the waveforms for the left and right channels are in alignment.
2. Tape Speed Adjustment
• Connect the Frequency Counter to TAPE OUT.
1. Insert the test tape (MTT-111N, etc.; 3,000Hz) into the DECK.
2. Press the PLAY button. .
3. Adjust a hole on the motor bottom so that a frequency counter reading of 3,000 } 5Hz is obtained.See Fig.3.
4. Press the STOP button, and eject the test tape.
3. Torque Measurement
Item
Test Cassette
PLAY/REV.
F.FWD/REW
Take-up Torque
PLAY:TW2111A(FWD)
30~65 grcm
55~140 grcm
TP1
(RF)
TP4
(VC)
a
MOTOR
Back tention
PLAY:TW2112A(FWD)
2~6 grcm
-
- 3 -
+
OSCILLOSCOPE
-
OPENING EXPANDED
NORMAL
hole for adjustment
Pully tention
Driving power cassette:
TW-2412(PLAY)
50 grcm
-
b
Fig.1
Fig.2
Fig.3
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