Electrical Adjustment; Head Azimuth Adjustment; Test Equipment/Tools Required - Pioneer CT-9R Service Manual

1 .
2 .
5 . E L E C T R I C A L A D J U S T M E N T
Precaution
Mechanical adjustment should be completed.
Clean the following
parts with
an alcohol
moistened swab; Record/Playback head, Pinch
roller, Erase head, Rubber belts and Capstan.
Demagnetize record/playback head with a head
demagnetizer.
Do not use magnetized screwdriver for adjust-
ments.
Adjustment and measurements should be per-
formed for both L-ch and R-ch with rated
power supply voltage.
Adjustments should be performed in the order
given in this sewice manual. Altering the order
can hinder proper adjustments, resulting in loss
of performance.
Level during measurements are based on
OdBv=lV. Connect a 50kO dummy resistor
across the OUTPUT terminals.
Let the CT-9R warrn up (aglng) for a few
minutes before proceeding with the adjust-
ment.
Set the DOLBY NR switch OFF and MONI-
TOR switch TAPE unless directed otherwise.
Test Equipment/Tools Required;
1. Test tape
STD-331A
for general playback pur-
pose
STD-341A .... . . for playback adjustment
STD-608A . NORMAL blank tape
STD-603
. . .'CrO, blank tape
STD-604
... METALblanktape
Audio oscillator
AC millivoltmeter (AC mV)
Attenuator
Oscilloscope
Resistor 50kO (1/4W)
l O ! ! C
3 O r r c
l o r . c
l O . a c 6 o r . c
t O r . c 3 o r . c
Fig. 5-1 Contents of test tape STD-33,|A
I
o * -
"
T--l
_ zo I rlrxr
r____r__r_r
I
I r o r B r 1 3 3 3 f l t | 6 l r H r
I
14
Fig b-2 ;"";,:;;r";",;
*;'rr, ..,,^
5.1 Head Azimuth 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-341A, 10kHz
portron
AC mV meter
. . . OUTPUT terminals
OUTPUT level control
Max.
Procedure:
Play back the test tape in both FWD and REV
directions. Adjust the head azimuth screw to the
position of maximum output level.
Fig. 5-3 Azimuth adiustment points
3 .
4 .
5 .
6.
7 .
8 .
9 .
2 .
3 .
4 .
5 .
6.
L E V € L ( d O )
Fig. 5-4 Head azimuth adjustment