Advertisement
AM ALIGNMNET CHART
Signal
Generator
Frequency Setting
Adjustment
Remarks
Frequency
Adjust coil T102 until
450 kHz
Lowest Frequency
T102
best signal peak is
obtained.
Ant. Coil
Adjust for maximum
T103
inidication.
600 kHz
Tune to Signal.
Ant. Trim.
Adjust for maximum
C108
indication.
1400 kHz
Tune to Signal.
Repeat steps 2 and 3 as required.
FM-IF ALIGNMENT
1. Set the select switch to FM position.
2. Turn on both sweep generator and oscilloscope, and allow a fifteen-minute warm-up period.
3. Connect the RF SWEEP SIGNAL OUTPUT of the sweep generator to the test points TP3 and TP4.
(Figure 9)
4. Connect the oscilloscope vertical input directly to the test points TP1 and connect the shielded lead to the test point TP2.
5. Connect the SWEEP VOLTAGE OUTPUT to the sweep generator to the oscilloscope Horizontal input.
6. Proceed as outlined in the FM-IF ALIGNMENT CHART.
FM-IF ALIGNMENT CHART
Frequency
i
Setting
Connection
Set scope for con-
necting output
signal from TP1 to
Lowest
vertical axis of
Frequency
scope "V" and
sweep generator
10.7 MHz + 25kHz
output to horizontal
axis "H".
S CURVE
Sweep generator
of 10.7 MHz
center freq.
with 10.7 MHz
marker.
UNIT UNDER
FM SWEEP
GENERATOR
Figure 9
FM-RF ALIGNMENT
Turn on the signal generator and the VTVM, and allow a fifteen-minute warm-up period.
Connect the signal generator output through a 75 ohm dummy antenna across FM antenna.
(Figure 10)
Connect the VTVM across the test points TP1 and TP2.
Set the volume control to mid-position.
Adjust the signal generator frequency as indicated in FM-RF ALIGNMENT CHART, and maintain a sufficient signal output
level to provide a measurable indication.
6. Proceed as outlined in the FM-RF ALIGNMENT CHART.
aPWON
>
FM-RF ALIGNMENT CHART
Signal Generator
Radio Dial Setting
Adjustment
Remarks
Ant. Coil
90.1 MHz
L001
| Adjust for maximum
Tune to signal.
e e
S e
Ant. Trim.
output indication.
106.1 MHz
C003
Repeat steps 1 and 2 required.
FM SIGNAL
GENERATOR
DUMMY
ANTENNA
50 OHM
Figure 10
OUTPUT LEVEL ADJUSTMENT
I. Preliminary Work
1) Place function switch in "NORMAL"
position.
2) Place Dolby switch in "IN" position.
3) Load MTT-150 (ATT-150) 400 Hz test tape.
4) Connect a lead (terminated with alligator clip) of VTVM to Dolby output terminal and another lead to chassis ground.
Level Adjustment
1) Playback the test tape.
2) Adjust trimming post semi-fixed resisstor R401 (L ch), R402 (R ch) until output reading of 100mV +8mV is obtained on
the VTVM, using alignmnet driver.
(Proceed this alignment for both left and right channels.)
Note:
When connecting alligator clip to the output terminal, clip it to C503 (or 13 pin of Q501), C504 (or 4 pin or Q501).
MOTOR SPEED ADJUSTMNET
1.
Connect a VTVM or a Frequency counter to the headphone
jack.
2. Insert cassette test tape (MTT-111, 3 kHz).
3. Playback the test tape in| FWD
|direction about tape start.
4. Adjust R904 for 3000 Hz +15 Hz reading on the frequency
counter.
CURRENT CONSUMPTION
HARB es 6 cuore o.xa ve Ose sade anders don ie 160mA
FIM a: o.Seecae indie tx andes apts ob wren wae 47mA
AM:
2.2 5.conehatate passa
37mA
CASSETTE MECHA. TORQUE
PLAN i, toss csc cap as sai sc ve pny os ae
20 ~ 55g-cm
FEAR EW sii
emcee
dardtioe aioe More than 55g - cm
Advertisement
