Head Azimuth Adjustment; Playback Level Adjustment - Pioneer XR-A6800 Service Manual

QQ
3 7 63 1515 0
0 dB 30s
0 dB: 315 Hz, 250 nwb/m
30s
315Hz
6.3kHz
Playback Adjustment

(1) Head Azimuth Adjustment

• Do not switch between forward and reverse operation with the screwdriver inserted.
Step Mode
STD-331E test tape
1 PLAY
(Playback: 10kHz,
–20dB)

(2) Playback Level Adjustment

• Since this adjustment determines playback dolby NR level, perform it carefully.
Step Mode
STD-331E test tape
1
TE PLAY
L 13942296513
(Playback: 315Hz, 0dB)
REV Azimuth Adjustment Screw
Fig. 5 Head Azimuth Adjustment Screw
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30s 30s 10s
10kHz 315Hz 14kHz
Input Signal/
Adjusting Points
Test Tape
Deck Ι
Head azimuth
adjustment
Deck ΙΙ
screw (Fig. 5)
Input Signal/
Adjusting Points
Test Tape
VR2303 (L ch)
Deck Ι
VR2304 (R ch)
VR2305 (L ch)
Deck ΙΙ
VR2306 (R ch)
FWD Azimuth Adjustment Screw
x ao
y
i
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8
10s ......................................................................................................... 10s
12.5 6.3
10kHz 8kHz 4kHz 2kHz
kHz kHz
Fig.4 STD-331E Test Tape
Measurement
Points
TAPE TEST
Max. playback
POINT (L, Rch)
signal level
(AF Assy)
Measurement
Points
TAPE TEST
Q Q
POINT (L, Rch) 3 6 7 1 3
– 3.7dBV
(AF Assy)
u163
.
XR-A6800, XR-A4800
2 9 9 4 2 8
500 250 125
1kHz
Hz Hz Hz
Adjustment
Remarks
Value
After adjustment, apply silicon bond to
the head azimuth adjustment screw.
Adjustment
Remarks
Value
1 5 0 5 8 2 9 9 4
PLAYBACK
12.5k
250 10k
3dB 3dB 4dB
RECORDING
12.5k
250 10k
3dB 3dB 5dB
Fig. 6 Frequency Characteristics
m
co
9 9
–20 dB
63Hz 40Hz
2 8 9 9
55