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SECTION 4
ELECTRICAL ADJUSTMENT
1.
Demagnetize
the
record/playback
head
with
a _ head
Specification :
demagnetizer.
(Do not
bring the head
demagnetizer
close
to the erase
head.)
Do not use a magnetized
screwdriver
for the adjustments.
3.
After the adjustments,
apply suitable locking compound
to
the
parts
adjusted.
4,
The
adjustments
should
be
performed
with
the
rated
power
supply
voltage
unless
otherwise
noted.
5.
The
adjustments
should
be performed
in the order given
in
this
service
manual.
(As
a
general
rule,
playback
circuit adjustment
should
be completed
before
performing
recording
circuit
adjustment.)
Digital
frequency
counter
2,920H2z~—3,070Hz
Ww
Record/Playback
Head
Azimuth
Adjustment
Note: Perform
this
adjustments
for both
decks.
Procedure:
1,
Mode: FWD
playback
6.
The adjustments
should be performed
for both L-CH
and
test tape
R-CH
P-4-.A100
oscilloscope
(10kHz,
~ 100B)
L-CH
e
Switches
and
controls
should
be
set
as
follows
unless
otherwise
specified.
DOLBY
NR
switch: OFF
GEQ
RV: CENTER
ISS
switch: 1
FUNCTION:
CD
Pasi
®
Standard
Record:
DOLBY
OUT
Deliver
the standard
input signal
level to the input jack
and set the REC
LEVEL
control
to obtain
the standard
output
signal
level.
2.
Turn
the adjustment
screw
and check
output
peaks.
If
the peaks
do not match
for L-CH
and
R-CH,
turn
the
adjustment
screw
so that outputs
match
within
1 dB of
peak,
Mode: record
within 1 OB
y
AF OSC
ra
©
attenuator
Output
level
within
1 0B
©
oto
11200 0°
co
DOLBY OUT
(TP301)
7
—>
screw
position
@ML-CH
L-CH
R-CH
TP301 | ® GND
neat
peak
@ R-CH
Standard
Input
Level
screen
pattern
OOOGS
in phase
45°
135°
180°
en
eennmmeenaaamnetemanen" — Seeeqnannmanaeinney seen"
good
wrong
Standard
Output
Level
3.
After the adjustments,
apply suitable locking compound
to
the parts
adjusted.
Adjustment
Location:
DOLBY
OUT
Tape
Speed
check
Adjustment
screw
REC/PB
head
(deck
8) or
blank
tape
Procedure:
speed
checker
or
PB
head
(deck
A)
Mode:
FWD
playback
digital frequency
counter
test
tape
WS488
(3KHz,
OdB)
DOLBY
OUT
(TP301)
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