Samsung SCM-7270 Service Manual page 14

Alignment and Adjustments
4-1-1 Test Equipment
1. AM Standard Signal Generator (S. S. G) : 400Hz, 30% MOD
2. Oscilloscope
3. VTVM
4. Frequency counter
5. Loop antenna
6. Dummy load (4½)
7. DC voltmeter
4-1-2 Pre-Adjustment
1. Check the source voltage.
2. Set function and band switches to the band to be aligned.
3. Set the equalizer, volume and balance controls to mid position
Item
Step
Intermediate
frequency(IF)
1
adjustment
AM frequency
coverage
2
adjustment
3 Repeat step 2 and 3 serveral times
AM tracking
4
adjustment
Repeat step 5 and 6 serveral times
5
AM Signal
Generator
4-2
Pre-Setup
Condition
Figure 4-5
Figure 4-4
Connect DC
voltmeter to TCON1
and GND(TP1)
Figure 4-5
-
TP2
SET
TP1
Figure 4-4 AM Frequency Coverage Adjustment
AM
Test Loop
Loop Antenna
Antenna
Jack
60 cm
Figure 4-5 AM Tracking Adjustment
FREQ.Setting
SSG.FREQ.
522 KHz 522 KHz
-
522 KHz
1611 KHz
-
594 KHz
594 KHz
1404 KHz
1404 KHz
Input
Speaker
terminal
SET
GND
Adjsut.
Point
IT2
OT1
OCT2
OL1
OCT1
DC Voltmeter
Oscilloscope
VTVM
IN
OUT
Samsung Electronics
Remark
Maximum output
0.9V
9V
Maximum output
Maximum output