Read JBL SG 2020 Service Manual online
-7-
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 anyone tam-
pers with the adjustment, realignment may be necessary.
recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tam-
pers 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.
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
1. AZIMUTH ADJUSTMENT
2. NORMAL SPEED ADJUSTMENT
Deck Mode
A Deck Playback
MTT-114
Speaker Out
DECK Screw
Azimuth Screw
Maximum
B Deck Playback
MTT-114
Speaker Out
Azimuth Screw
Maximum
Test Tape
Test Point
Adjustment
Adjust for
Deck Mode
Normal Speed
MTT-111
Speaker Out
VR201
3kHz ± 1%
Hi-Speed
MTT-111
Speaker Out
more than 5.4kHz
A Deck
Hi-Speed
Dubbing Mode
Test Tape
Test Point
Adjustment
Adjust for
Remark
CH1 CH2
Speaker Out
Playback Mode
Head
Test Tape
MTT-114
MTT-114
L ch
R ch
GND
Dual-trace
synchroscope
synchroscope
Electronic
Voltmeter
Voltmeter
L out
R out
Unit
Figure 1. Azimuth Adjustment Connection Diagram
Head
Playback Mode
Unit
Speaker Out
GND
L out
R out
Record/Playback
head
head
Test Tape
MTT-111
MTT-111
Frequency Counter
Figure 2. Normal Speed Adjustment Connection Diagram
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