Pioneer DC-X77Z Service-Handbuch - Seite 27
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Electrical system
adjustment
Prior to the electrical system adjustment, be sure to con-
firm the following itesm.
1. The mechanical adjustment should be completed.
2. Perform cleaning of the head and the demagnetiza-
tion of head with the head eraser.
3. The level during measurement is determined at OdBv
= l V .
4. The specified tape should be used for adjustment.
Since the test tape has A side and B side, use the A
side with label.
STD-331B: For playback system adjustment
STD-608A: Normal blank tape
STD-620: CrOz blank tape
5. Prepare the following measuring instruments.
AC millivoltmeter, low frequency oscillatore, attenu-
ator, and oscilloscope.
6. For the adjustment, perform both L and R channels
unless otherwise specified.
7. Turn the Dolby NR switch to off unless otherwise
specified.
8. Prior to the adjustment, be sure to perform aging of
the set for several minutes. Especially prior to enter-
ing the adjustment of the recording and playback fre-
quency characteristics, aging should be performed in
REC/PLAY mode for 3 to 5 minutes.
9. The-adjustment should be performed in accordarrce
with the adjustment order. If the order is not kept.
it may cause the failure of the complete adjustment
which induces the inferior function of the unit.
Deck I
l.
Head azimuth adjustment
2. Playback level adjustment
Deck ll
l.
Head azimuth adjustment
2. Playback level adjustment
3. Adjustment of recording and playback frequency
characteristics
4. Adjustment of recording level
1 6 O n w b / m
3 t 5 H
o d B
F i g . 7 - 2 T e s t t a p e S T D - 3 3 1 B
3 0 s
3 l 5 H z
6 . 3 k H z
l O k H z
3 1 5 H z
12.5
k H 2 o k H
8 k H z , 3 k H l k H z 2 kHz I kHz
OOHi
25H
; 3 H 2
l O H z