Zenith LX-140, Service Manual

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- 2-1 -
SECTION 2. ELECTRICAL
❏
ADJUSTMENTS
This set has been aligned at the factory and normally will not require further adjustment. As a result, it is
not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if any-
one tampers with the adjustment, realignment may be necessary.
IMPORTANT
1. Check Power-source voltage.
2. Set the function switch to band being aligned.
3. Turn volume control to minimum unless otherwise noted.
4. Connect low side of signal source and output indicator to chassis ground unless otherwise specified.
5. Keep the signal input as low as possible to avoid AGC and AC action.
TAPE DECK ADJUSTMENT
CH1 CH2
Speaker Out
Playback Mode
Head
Test Tape
MTT-114
L ch
R ch
GND
Dual-trace
synchroscope Electronic
Voltmeter
L out
R out
Unit
1. AZIMUTH ADJUSTMENT
2. TUNER ADJUSTMENT
Figure 1. Azimuth Adjustment Connection Diagram
Deck Mode Test Tape Test Point Adjustment Adjust for
Palyback MTT-114 Speaker Out DECK Screw Maximum
Azimuth Screw
Head
Playback Mode
Unit
Speaker Out
GND
L out
R out
Record/Playback
head
Test Tape
MTT-111
Frequency Counter
Figure 1. Azimuth Adjustment Connection Diagram
Item Test Point Adjustment Adjust for
DC Voltage Check point TP1, TP2 DECK Screw 0V ± 50mV