Erasure Current Adjustment; Recording/Playback Frequency Response Adjustment - Pioneer CT-7R Service Manual

1 2 . 6 E R A S U R E C U R R E N T A D J U S T M E N T
The adjustment procedure is the same for both the FllD
and REV directions, but if there is a difference between the
two indications, adjust so that the lower of the two erasure
current indicatiotæ is t 80mV lon,^V
Setting:
M o d e
. . . . R e c o r d
INPUT Level Control . . . Min.
AC mV meter . . . . TP301 of the Mother
assembly
Testtape
.. STD-604
Procedure:
1. Set the CT-?R to the FWD position and
adjust the VR305 so that the AC mV meter
reads 180mV.
2. Likewise, set the
and confirm that
* 0 m V .
-40
1 2 . 7 R E C O R D I N G / P L A Y B A C K F R E O U E N C Y
RESPONSE ADJUSTMENT
Setting:
M o d e
. . . . . R e c o r d
Record/Playback
333H2. - 30dBv
( 3 1 . 6 m V )
6.3kHz, - 30dBv
( 3 1 . 6 m V )
STD-608A
OUTPU'I terminals
CT-?R to the REV position
AC mV meter reads 180mV
r e v e r + r d B : ù
5 d E
Procedure:
1. Adjust the INPUT level
so tàat the
AC mV meter reads - 27dBv (
v).
2. Set the CT-?R to the FWD
and record
and playback the input
(333H2 and
Adjust the
) so that the
6.3kHz) onto the
VR301 (Lch) and VR303 (
difference between two is +1
3. Likewise. set the CT-?R to
and record and playback
s dB'
( 3 3 3 H 2 a n d 6 . 3 k H z )
o n t o
Then adjust the VR302 (
(Rch) so that the diffe
+1dBlô 5 dB.
* As listed in the specifications
Fig. 12-5 and
check to see that perf
tions.
Frequency Response
specifica-
Using STD-331A with DOLBY NR O
Houeue\ the ight
channel is co
e d b y - l d B
o t
63H2, ond -0.5d8
at 125H2 b
effect.
the insulation
I N P U T
€-
u.lr. ,rJ". .s1". ,*1".
Overall Frequency Response
Using STD-6OBA with DOLBY NR O
3 3 3 a z
6 . 3 k H z
/ - \
ft8v
,. " /'
( 3 l 6 m V )
-
d
Po'
ri
I
#'1J
REV position
input signals
e STD-608A.
and VR304
ou@uts is
Input Signal
(from INPLIT)
Test tape
AC mV meter
6 3 H z 1 2 5 H 2