Playback Equalizer Adjustment; Playback Level Adjustment - Pioneer CT-9R Service Manual

5.2 Playback Equalizer Adjustment
Setting:
M o d e
. . . .
P l a y b a c k ( F W D a n d R E V )
Test tape
. STD-331A, 333H2 and
10kHz portions
AC mV meter
. . . OUTPUT terminals
VR1703, VR1704. . . . . Max.
VR1701, VR1?02
Center position
Procedure:
1. Set the CT-9R to FWD direction and play back
333H2 and 10kHz portions of the test tape.
2. Adjust the VR1701 (Lch) and VR1702 (Rch)
so that the 10kHz playback level reads 2dB
higher than that of 333H2.
3. Set to the REV direction and play back the
10kHz portion, then confirm that the playback
output deviation is within +2dBt1dB of the
333H2 portion.
4. Set to the FWD direction and play back the
741<Llz portion, then the difference from the
333H2 portion
should lie within the - 1 to
+4dB range.
5. Set to the REV direction and repeat step 4.
5.3 Playback Level Adjustment
Since this adjustment determines the DOLBY
NR level during playback, it should be performed
precisely.
Setting:
M o d e
. . . . P l a y b a c k ( F W D a n d R E V )
Test tape
. STD-341A, 333H2 OdB
portion
AC mV meter
. . . TPl (Lch) and Tp2 (Rch)
for the
DOLBY NR
assembly
Procedure:
1. Set the CT-9R the FWD direction, then adjust
the VR1703 (Lch) and VR1704 (Rch) of the
Sub amplifier assembly so that the AC mV
meter reads - 3.7dBv (653mV).
2. Next set to the REV direction and confirm
that the AC mV meter reads - 3.7dBvt0.5dB
(691mV-616mV)
Fig. 5-6 Playback level adjustment
V R 1 7 0 1 ( L c h )
V R 1 7 0 2 ( R c h )
v R 1 7 o 3 ( L c h )
V R I 7 O 4 { R c h )
(Lewl : Playback levell
A
l O k H z l e v e l - 3 3 3 H 2 l e v e l = + 2 d B
B
l O k H z l e v e l - 3 3 3 H 2 l e v e l = + 2 d B 1 1 d B
14kHz level - 333H2 level : OdBrldB
Fig. 5-5 Playback equalizer adjustment