Electrical Adjustment - Pioneer CT-730 Service Manual

1 2 . 2 E L E C T R I C A L A D J U S T M E N T
o Check the following points before starting any
electrical adjustments.
1. All mechanical adjustments must be completed.
2. Clean the heads and demagnetize the erase
head.
Level mea.surements are based on OdBv : lV.
Connect a 50kO dummy resistor (471? 52kC2 )
across the OUTPUT terminals.
Use the specified test tapes for each adjust-
ment. Although test tapes have both A and B
sides, use the side with the lable (side A).
9. Proceed according to the specified adjustmen
sequence. Changing the sequence can preven
proper adjustments from being carried out, anr
subsequently result in loss of performance.
Adjustment sequence
1. DOLBY NR level.
2. Head azimuth
3. Playback level
4. Playback equalization check
5. Level meter check
6. Record/playback frequency response
7 . Recording level
3 .
4 .
STD-341A
STD-608A
STD.6O3
STD.604
Playback adjustments
NORMAL blank tape
CrO2 blank tape
METAL blank tape
Prepare the following measuring equipment.
AC millivoltmeter, audio oscillator, attenuator,
and oscilloscope.
Unless otherwise specified, always adjust for
both left and right channels.
Unless otherwise specified, adjust with the
DOLBY NR
switch in the OFF position.
Let the deck warm up for a few minutes before
starting adjustments. Also leave the deck in
playback and recording mode respectively
for 3 to 5 minutes before starting playback
and recording frequency response adjustments.
L E V E L ( d B )
5 .
t
ot------l
-' o{ r" s",
I
| ,o*"-T"""".T;;l ,
1 OOsec 1 Oosec SOsec
1 OOsec
Fig. 12-5 STD-341A test tape
6 .
7 .
8 .
-
@N
V R 4 0 I
I
rPr
ffi1
\
\S'
_ t ^ /vR203
vnros-@'@';;"
o
-]
Fig. 12-6
Adjustment points