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SG-290H/HB
©
MW/LW
IF/RF ADJUSTMENT
e Set the function selector switch at MW position.
e Set the signal generator to produce a signal of 400Hz,
30%, AM modulated.
FRE-
DIAL
AD-
QUEN-
| POINTER
| JUST-
cY
SETTING
| MENT
TEST
STAGE
REMARKS
MW IF (Connect instruments as shown in Fig. 12-1.)
High
7201
Adjust
for best
"IF"
IF
a55khz
Frequency
Curve
MW
RF (Connect instruments as shown
in Fig. 12-1.)
Lowest
513kHz
Band
frequency
coverage
L205
Highest
1650Hz
frequency
TC204
Adjust
for
maximal
output.
{
coos | Tyger
Tracking
+
Tune to
1400kHz | 1 400kHz
+
J
Repeat steps 2, 3 and 4, 5 until nonfurther
improvement
can
be
made.
L202(B)
TC202
®@ Set the function selector switch at LW position.
®@ Set the signal generator to produce a signal of 400Hz,
30%, AM modulated.
FRE-
DIAL
AD-
QUEN-
| POINTER
| JUST-
cY
SETTING
| MENT
TEST
STAGE
REMARKS
LW RF (Connect instruments as shown in Fig. 12—1.}
Lowest
144kHz
Band
| frequency
coverage
L204
+
Highest
295kHz
frequency
TC203
Adjust
for
maximal
output.
Tune to
16OKHZ | GokHz
Tracking
"
260kHz
L202(A)
Tune to
260kHz | 1C201
Repeatsteps 1, 2 and 3, 4 until no further improvement can be made.
Figure 12-1 AM IF/RF ADJUSTMENT
voltmeter
Oscilloscope
TP201 (1)
TAPE DECK CIRCUIT ADJUSTMENT
BIAS CURRENT
ADJUSTMENT
1. Connect
instruments as shown in Fig. 12-2.
2. Load anormal
tape into the unit.
3. Adjust the variable resistors VR401 (left) and VR402 (right)
so that the electronic voltmeter
reads
11.0V.
For the
adjustment with use of other tapes, refer to Table 12-1.
16.3V+3.1V
25.1V43.1V
Metal tape
Table 12—1
PLAYBACK SENSITIVITY ADJUSTEMENT
1. Connect
instruments as shown in Fig. 12-3.
2. Turn
off the Dolby
NR
switch.
3. Load the unit with a test tape (TEAC
MTT-150, 400 Hz,
200
pWb/mm
prerecorded),
and place it in play mode.
4. Adjust
the
variable
resistors
VR501
(left) and VR502
(right) so that the electronic
voltmeter
reads 100 mV.
REC/PB
head
Electronic
Voltmeter
Record
TP401@
Figure 12-2
Electronic
Playback
TP501@(L)
Voltmeter
REC/PB
head
mode
TP501@ (R}
Test tape
MTT-150
Ground
TP501 @
Figure
12-3
RECORD/PLAYBACK SENSITIVITY ADJUSTMENT
1. Connect
instruments as shown in Fig. 12—4.
2. Turn
off the Dolby
NR
switch.
3. Load
the unit with
a normal
tape
(TEAC
MTT-502),
and
using CR
oscillator
apply a signal of oscillation
fre-
quency 1 kHz and adjust the CR oscillator output level so
that the voltmeter reads 10mvV.
4. Put
the
normal
tape recorded
in Step 3 into the unit,
and place the unit in play mode.
Then adjust the variable resistors VR503 (left) and VR504
(right)
so
that
the electronic
voltmeter
reads
10mV.
For the adjustment with use of other tapes, refer to Table
12-2,
CrO2 tape
Metai Tape
8.4mV
~ 12mV
Table12 -2
Electronic
Voltmeter
Low frequency
Mic. Jack
Record
TP501@or@
mode
oscillator
J401
1kHz, 200 mV
Attenuator
Normal tape
head
(MTT-502)
Playback
CrO2 tape
Electronic
TP501
mode
(XL -221)
Voltmeter
@Mor@)
Metal tape
(AC-711)
Ground
Figure 12-4
-12-
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