Pioneer XR-A670 Service Manual page 60

XR-A670, XR-A370
QQ
3 7 63 1515 0
0 dB 30s
0 dB: 315 Hz, 250 nwb/m
30s
315Hz
6.3kHz 10kHz
Playback Adjustment
(1) Head Azimuth Adjustment
• Do not switch between forward and reverse operation with the screwdriver inserted.
Input Signal/
Step Mode
Test Tape
STD-331E test tape
1 PLAY
(Playback: 10kHz,
–20dB)
(2) Playback Level Adjustment
• Since this adjustment determines playback dolby NR level, perform it carefully.
Input Signal/
Step Mode
Test Tape
STD-331E test tape
1
TE PLAY
L 13942296513
(Playback: 315Hz, 0dB)
REV Azimuth Adjustment Screw
Fig. 7 Head Azimuth Adjustment Screw
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60
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30s 30s 10s 10s ......................................................................................................... 10s
12.5
315Hz 14kHz
kHz
Fig.6 STD-331E Test Tape
Adjusting Points
Deck Ι
Head azimuth
adjustment
Deck ΙΙ
screw (Fig. 7)
Adjusting Points
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
6.3
10kHz 8kHz 4kHz 2kHz
kHz
Measurement Adjustment
Points Value
TAPE TEST
Max. playback
POINT (L, Rch)
signal level
(AF Assy)
Measurement Adjustment
Points Value
TAPE TEST
Q Q
POINT (L, Rch) 3 6 7 1 3
– 3.7dBV
(AF Assy)
250
3dB
250
3dB
Fig. 8 Frequency Characteristics
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.
2 9 9 4 2 8
500 250 125
1kHz
63Hz 40Hz
Hz Hz Hz
Remarks
After adjustment, apply silicon bond to
the head azimuth adjustment screw.
Remarks
1 5 0 5 8 2 9 9 4
PLAYBACK
12.5k
10k
3dB 4dB
RECORDING
12.5k
10k
3dB 5dB
m
co
9 9
–20 dB
2 8 9 9