Sharp SG-290H User Manual

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.
AM
Electronic
Signal
generator
Loop
antenna
mw/LW
GO
i
Ground
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-

Sharp SG-290H Specifications

General

Brand	Sharp
Model	SG-290H
Category	Turntable
Language	English