LG GoldStar TSR-940 Service Manual page 9

SW Section
Circuit : : Generator . : '
'Aiagiment Equipment Connection Frequency Dial Setting Adjustment
AM Signal Generator 5.7 MHz Tuning gang L7 (SW OSC. Coil).
to antenna terminals (400 Hz Mod.) fully closed Adjust for maximum
through SW dummy output.
Band matching network 18.5 MHz Tuning gang | TC8 (SW OSC. Trimmer).
Output Meter (VTVM} (400 Hz Mod.) fully open Adjust for maximum
across 4 ohm load output.
(Figure 5) }—
Repeat steps 1 & 2
AM Signal Generator Turn to L4 (SW Ant. Coil)
to antenna terminals 6.5 MHz signal Adjust for maximum
through SW dummy output.
Tracking matching network TC6 (SW Ant. Trimmer) |
+ .
Output Meter (VTVM) 16 MHz reg Adjust for maximum
across 4 ohm load g output.
(Figure 5) i
Repeat steps 4 & 5
several times.
FM Section
Circui G at ; '
; peur Equipment Connection Step pied Dial Setting Adjustment
Alignment Frequency
Connect input of 10.7 MHz Tuning gang T1, T4 (FM IFT).
IF Genescope to C25 (+), fully closed Adjust for maximumn
output to the body 1 symmetrical resporse
IF of ICI through (10.7 MHz at the
the dummy. center point)
FM Signal Generator 87.35 MHz Tuning gang L2 (FM OSC, Coil).
to antenna terminals 3 (400Hz Mod.) fully closed Adjust for maximun
through 75 ohm output
. —
Band antenna matching 108.25 MHz Tuning gang | TC2 (FM OSC. Trimmer).
network, Output 4 (400 Hz Mod.) | fully open Adjust for maximun
Meter (VTVM) across :
output
4 ohm load |
(Figure 6) 5 Repeat steps 3 & 4
several times.
90 MHz Tune io L1 (FM Ant. Coil)
FM Signal Generator 6 (400 Hz Mod.) signal Adjust for maximun
to antenna terminals Ouiput.
through 75 ohm 106 MHz Tune to TC1 (FM Ant. Trimner).
Tracking
antenna matching
7 (400 Hz Mod.)
signal
Adjust for maximur
8
network, Output
Meter (VTVM) across
4 ohm load
(Figure 6)
Output.
Repeat steps 6 & 7
to obtain suitable
sensitivity at 90 Miz
and 106 MHz