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4.2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
PRECAUTION
l. Adjustments should be performed in the order
given.
Generally playback circuit adjustments should be
completed before performing recording circuit
adjustments.
2. Adjustments should be performed for both L ch
and R-ch.
Switches and controls should be set as follows
unless otherwise sPecified.
a Positions of switches and control knobs
F U N C T I O N
. . . . . . .
T A P E
I S S . . .
. . . . . 2
D I R E C T I O N M O D E , .
. . . .
?
G R A P H T C E Q U A L I Z E R . . .
' m e c h a n i c a l c e n t e r
MEGA BASS
. .
scale 5
BALANCE
. mechanical center
o d B - 0 . 7 7 5 V
Frequency difference between FWD and REV should be within
r.5%.
Adiusimont Localion: TC board
Short-circuil with
a screwdriver for the
high speed adjustment.
a d -
t h e
\
C N P 1 2 1 _ L
TÏ
,uilZ
o'c* e { Eyi33i ii?;idt</
n . n ,
o I R V 3 0 8 ( n o r m a l )
" - ' ' '
"
I R V 3 0 9 ( h i s h ) -
Tope speed Adlustment FEEK Al TDFCK Bl
P r o c e d u r e :
Mode : FWD playback
test tape
ws-48A
( 3 k H 2 . 0 d B )
P e r f o r m h i g h s p e e d
i u s t m e n t
P l a y b a c k t h e t e s t
s p e c i f i c a t i o n s b e l o w .
Adiustm€nt Valuer
speed checker
o r
32 l? trequency counter
P H O N E S j a c k
a d j u s t m e n t
b e f o r e m o r m a l s p e e d
t a p e W S 4 8 A
a n d a d j u s t t o m e e t
speod
deck
Adiustmenl
pan
t€st
pin
c N 1 2 1
speed chscker
heading
frrquancy
counlea
reading
high
R V 3 0 7
short
4 . 1 7 t o + O . l ' 7 7 " 6 , 0 0 0 t 1 0 H z
B
RV3O9
normal
R V 3 0 6
open
-0.1'7 ro +O.l'l% 3 , 0 0 0 t 5 H z
B
RV308
a S t a n d a r d i n p u t l e v e l
Input Pin
Mtx Mlc
L I N E I N
Signal source imPcdance
300 n
1 0 k n
lnput signal level
0 . 7 7 5 m V
( - 6 0 d B )
0 . 4 3 6 V
( - 5 d B )
Frequency
I kHz
I k H z
a S t a n d a r d o u t p u t l e v e l
Outpul Pin
S P O U T ( L . R }
P H O N E S
Signal source impedance
6 s }
3 2 n
Output signâl level
0 . 7 7 5 V
(0 dB)
0.245 V
( - 1 0 d B )
.
Test tape
T6st Tapo
Signâl
Used for
ws48A
3 kHz, 0 dB
Tape speed adjustment
P4-A063 6 . 3 k H z , - 1 0 d B
Head azimuth adiustment
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