Sanyo DC-077, Service Manual

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• 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. Azimuth Adjustment
1. Load a test tape (VTT-738 etc. : 10kHz) in the Deck.
2. Press the PLAY button. (Normal playback)
3. 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.
4. Press the PLAY button. (Reverse playback)
5. 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.
6. Adjust so that the waveforms for the left and right channels are in alignment.
2. Replacement of Head
3. Parts Location
WHITE
BLUE
BLA
CK
RED EAR
TH
ORANGE YELLO
W
VR361
TAPE SPEED
ADJUSTMENT
VR372
REC/PLAY
GAIN
L-CH
ADJUSTMENT
VR382
REC/PLAY
GAIN
R-CH
ADJUSTMENT
L3601
BIAS
FREQUENCY
ADJUSTMENT
VR371
PLAYBACK_L-CH
ADJUSTMENT
VR381
PLAYBACK_R-CH
ADJUSTMENT
L3551
19KHZ-TRAP
EFFECT
ADJUSTMENT
R-CH
BIAS-ADJUSTMENT
L-CH
VR373
VR383
BIAS-ADJUSTMENT
R-CH
L3501
19KHZ-TRAP
EFFECT
ADJUSTMENT
L-CH
TAPE DECK ADJUSTMENT
TAPE DECK SECTION