Tape Adjustments - Sanyo DC-BM300 Service Manual

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.1.
5. Press the PLAY button. (Reverse playback)
6. Use a + tip screwdriver to turn the screw for reverse azimuth
adjustment so that the left and right outputs are maximized
at the same phase during reverse playback.
7. 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
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)
PLAY : TW2121A(REV)
F.FWD / REW : TW2231
30~65grcm
70~140grcm
70~140grcm
ST ANDBY
/ ON
RDSMODE
MEMOR Y
FUNCTION
NORMAL
Back tention
PLAY : TW2111A(FWD)
PLAY : TW2121A(REV)
2~6grcm
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- 3 -
EJECT
CLOCK/TIME
TUNING +
TUNING -
F U L L L O G I C C O N T R O L / A U T O R E V E R S E
TUNER/BAND
VOLUME
M U L T I F U N C T I O N D I S P L A Y
– +
REVERSE
PTYCHECK / PTY SELECT
/
BASSXPANDER SOUND PRESET OPEN/CLOSE
PRESET – PRESET +
M I C R O C O M P O N E N T S Y S T E M
PHONES
Fig.1
hole for adjustment
MOTOR
Fig.2
±
5Hz is obtained.See Fig.2.
Pull tention
Driving power cassette:
TW-2412(PLAY)
TW-2422(REV.PLAY)
>50grcm
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