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R-70/
R-70M
Step
Adjustment item
Connection
Instrument required
terminal
4
VCO adjustment
300!1 FM
FM SG
I
ANT
[98MH'
±
1 kH'
]
70dBµ
(75.2dBf)
Unmodulated
TP4
"'TP5
Resistor 2.2Mn
(19M) (+12)
TP3
"'GND
FC
(19kHz)
5
Stereo distortion
300!1 FM
FM SG, SSG
adjustment
ANT
[98MH'
±
1 kH'
]
70dBµ (75.2dBf)
STEREO
L, R
1kHz,100% MOD
REC OUT
DIST. M, OSC
(TP6,
TP7)
BPF
6
Separation confir-
300!1
FM
FM SG, SSG
mat ion
ANT
r98MHd1kH'
l
70dBµ (75.2dBf)
STEREO
Lor R
1kHz,100%
MOD
REC OUT
OSC, ACVM, BPF
(T.P6, TP7)
7
Pi
lot cancel
300!1 FM
FM
SG, SSG
adjustment
ANT
[98MHd
1 kH'
]
70d8µ (75.2d8f)
PILOT9% MOD
REC
OUT
osc
(TP6, TP7)
Disconnect BPF
8
If offset adjust-
300!1 FM
FM SG
ment
ANT
[98MHz
±
1 kHz
J
70d8µ (75.2dBf)
TEST termi-
Short
nals
(K4,
T6)
9
Auto search
300!1 FM
FM
SG
reception confir-
ANT
[98MH'
±
1 kH'
]
mat ion
20d8µ (25.2dBf)
MONO 1kHz
100% MOD
2. AM TUNER SECTION
•Connect the AM dummy antenna for adjustment.
Step
Adjustment item
Connection
Instrument required
terminal
I
1
Sensitivity
confir-
AMANT
AM dummy antenna
mat
ion
AM SG
l
400H,, 30% MOD
l
50d8µ
630kHz
±
0.1 kHz
1440kHz
±
0.1 kHz
1080kHz
±
0 .1kHz
REC OUT
OSC.
(TP6, TP,7)
DST.M
ACVM
2
Signal Q
indica-
AM ANT
AM dummy antenna
tor confirmation
AMSG
[1080kHz
±
0.1kHzJ
80d8µ
3
Auto search
AM ANT
AM dummy antenna
reception confir-
AMSG
mat ion
[1080kHz
±
0.1 kHz
J
60d8µ
5
Adjustment
Adjustment method
Rating or
Remarks
locations
standard
VR103
CD
Connect resistor
19kHz
±
Confirm that
(VCO)
2.2Mn between TP4
10Hz
stereo indi-
(19M)
and TP5 (+12)
ca tor I
ights
and
force the set
in
up.
Stereo indica-
stereo
mode.
After adjust-
tor
®
Adjust so that VCO
ing,
remove
frequency
is at 19kHz
the FC and
the 2.2Mn
resistor.
T101
Same
as step
3
Less than
(ST DIST)
-48dB
G model
only Less
than
-33dB
- -
~
-
Confirm that the leak-
Less than
age level of the
26dB
opposite
channel is
minimum
VR102
Observe waveform on
More than
(PILOT
the OSC and adjust so
46dB
CANCEL)
that carrier leakage
level reduced to
minimum
VR106
By
shorting TEST
After adjust-
(FM
FINE)
terminals,
the counter
ing, open the
shifts by one digit, then
TEST
termi-
adjust so that the
nals.
lowest effective digit
comes to 9 or 0.
This figure
98.0MHz-c~g.·~
When shifting
TUNING
SW
Confirm that
auto
Confirm
-+UP
or
search reception is
that muting
DOWN
possible with
the
tun-
is
performed
ing button.
at auto
recep-
I
ti on.
•When once the test terminals are shorted in adjusting
FM, the frequency of 630kHz, 1440kHz, and 1080
kHz is memoried at each
AM
preset position 1, 2 and 3.
Adjustment
Adjustment
method
Rating
or
Remarks
locations
standard
Confirm the maximum
less than
sensitivity
55d8µ
PRESET
P1
P2
P3
Confirm that all signal
Confirm that
PRESET
Q
indicators light
all signal
0
P3
indicators
Signal
Q
go out at
detuned
point
TUNING SW
Confirm that auto
-+UP or
search reception is
DOWN
possible with the
tunning button.
I
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