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TC-RX77/RX77ES
|
SECTION 3
ADJUSTMENTS
3-1, MECHANICAL ADJUSTMENTS
PRECAUTION
1,
Clean
the following
parts
with
a denatured-
alcohol-moistened
swab :
record/playback
head
pinch
roller
erase
head
rubber
belts
capstan
idler
2,
Demagnetize
the
record/playback
head
with
a head
demagnetizer,
3.
Do
not
use
a
magnetized
screwdriver
for
the
ad-
justments,
4,
After
the adjustments, apply suitable
locking compound
to the
parts adjusted,
TORQUE
MEASUREMENT
CQ-102C
[80 - 60g cm (0.42 — 0.8302 inch)
F
WD
-
WD
CQ- 102C
1—5g+cm (0.014 — 0.0690z + inch)
Back
tention
REV
=
TREV.——sT«Ss
CQ 102RC_—«
[30 - 60g +cm (0.42 — 0.830z* inch)
REV
.
CQ~ 102RC
Back
tention
FF, REW
CQ~-201B
65 —90*cm
(0.9 — 1.2502 « inch)
1—5gecm (0.014 — 0,0690z + inch)
3-2, ELECTRICAL
ADJUSTMENT
Note:
The adjustment
should be performed
in the order given
in the service
manual.
As a rule, adjustments
about
playback should be performed before those about recording.
The adjustments
should
be performed
for both
L-
CH
and
R-CH,
*
Switches
and
controls
should
be set as follows
unless
otherwise
specified,
DOLBY
NR
switch
: OFF
DIRECTION
switch
oe
¢
Standard
Record:
Deliver
the standard
input signal level to the input jack
and set the REC
LEVEL
control
to obtain
the standard
output
signal
level,
—Record
Mode—
AF OSC
VTVM
me)
10k Q
O
Attenuator
e—_—
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LINE. IN
LINE OUT
Standard
Input Level
input
terminal
LINE
IN
Standard
Output
Level
Test
Tape
P-4-A100
10kHz, —10dB
Azimuth
Adjustment
P-4-L300
315Hz, 0dB
PB
Level
Adjustment
3kHz, 0dB
Tape Speed Adjustment
Test
Mode
1, Put the set into the test mode
by shorting test point TP801
(TEST)
of the main
bord during
the set is turned
off.
2. Remove
the short after the Electrical Adjustment
is completed.
Record Playback
Head
Azimuth
Adjustment
Procedure :
1,
Mode:
FWD
playback
Test
tape
P-4-A100
(LOkHz, —10dB)
VTVM
LINE OUT
2.
Turn
the
adjustment
screw
for
the
maximum
output
levels, If these levels do not match, turn the adjustment
screw
until both of output
levels match
together
within
1dB.
,
L-CH
k
a
within
1dB
R-CH
peak
Screw
position
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