59
XR-A6800, XR-A4800
Playback Adjustment
(1) Head Azimuth Adjustment
Recording Adjustment
(1) Bias Oscillation Frequency Adjustment
(2) Recording Bias Adjustment
• Do not switch between forward and reverse operation with the screwdriver inserted.
• Since this adjustment affects recording bias, prevent distortion from increasing due to underbias.
Note : No connecting to BIAS TP POINT at Step 2 REC → PLAY.
Deck ΙΙ
Fig.10 Head Azimuth Adjustment Screw
REV Azimuth Adjustment Screw
FWD Azimuth Adjustment Screw
Step Mode
Input Signal/
Test Tape
Adjusting Points
Measurement
Points
Adjustment
Value
Remarks
1 PLAY
STD-331E test tape
(Playback: 10kHz,
–20dB)
Deck Ι
Head azimuth
adjustment
screw (Fig. 10)
TAPE TEST
POINT (L, Rch)
(AF Assy)
Max. playback
signal level
After adjustment, apply silicon bond to
the head azimuth adjustment screw.
Step Mode
Input Signal/
Test Tape
Adjusting Points
Measurement
Points
Adjustment
Value
Remarks
1 REC
Load the STD-632 test
tape and set the
recording mode.
Deck ΙΙ
Oscillation
frequency to be
105.0kHz ±
2kHz.
Deck Ι
L2801
(AF Assy)
Between A
point Fig. 11
and GND
Step Mode Input Signal/Test Tape Adjusting Points
Measurement
Points
Adjustment Value Remarks
1 REC
Load the STD-632 test tape and
record (No signal)
Deck Ι
VR2802
(AF Assy)
BIAS TP POINT
(AF Assy)
24V to 27V
2
REC →
PLAY
Load the STD-632 test tape.
Record the 315Hz and 10kHz
signals at –25dBV input level
(check B point) and playback.
Deck ΙΙ
TAPE TEST
POINT (L, Rch)
(AF Assy)
Repeat adjustment until
playback level of the 10kHz
signal is within 0 ± 1.0dB
from that of the 315Hz
signal.
Deck Ι
VR2802
(AF Assy)
w
w
w
.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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