Pioneer XR-A6800 Service Manual page 59

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3 7 63 1515 0
Playback Adjustment
(1) Head Azimuth Adjustment
TE
L 13942296513
• Do not switch between forward and reverse operation with the screwdriver inserted.
Step Mode
STD-331E test tape
1 PLAY
(Playback: 10kHz,
–20dB)
Recording Adjustment
(1) Bias Oscillation Frequency Adjustment
Step Mode
Load the STD-632 test
1 REC tape and set the
recording mode.
(2) Recording Bias Adjustment
• Since this adjustment affects recording bias, prevent distortion from increasing due to underbias.
Step Mode
Load the STD-632 test tape and
1 REC
record (No signal)
www
Load the STD-632 test tape.
REC →
Record the 315Hz and 10kHz
2
signals at –25dBV input level
PLAY
(check B point) and playback.
.
Note : No connecting to BIAS TP POINT at Step 2 REC → PLAY.
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REV Azimuth Adjustment Screw
Fig.10 Head Azimuth Adjustment Screw
Input Signal/
Adjusting Points
Test Tape
Deck Ι
Head azimuth
adjustment
Deck ΙΙ
screw (Fig. 10)
Input Signal/
Adjusting Points
Test Tape
Deck ΙΙ
Deck Ι
Input Signal/Test Tape
Deck Ι
Deck ΙΙ
x ao
y
Deck Ι
i
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8
FWD Azimuth Adjustment Screw
Q Q
3 6 7 1 3
Measurement
Points
TAPE TEST
Max. playback
POINT (L, Rch)
signal level
(AF Assy)
Measurement
Points
Oscillation
frequency to be
Between A
L2801 105.0kHz ±
point Fig. 11
(AF Assy)
2kHz.
and GND
Measurement
Adjusting Points
VR2802 BIAS TP POINT
(AF Assy) (AF Assy)
TAPE TEST
u163
POINT (L, Rch)
VR2802
(AF Assy)
(AF Assy)
.
XR-A6800, XR-A4800
2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
Adjustment
Remarks
Value
After adjustment, apply silicon bond to
the head azimuth adjustment screw.
Adjustment
Remarks
Value
Adjustment Value
Points
24V to 27V
m
Repeat adjustment until
playback level of the 10kHz
signal is within 0 ± 1.0dB
co
from that of the 315Hz
signal.
9 9
2 8 9 9
Remarks
59