Service Manuals, User Guides, Schematic Diagrams or docs for : LG Audio cd321ax CD321A~1
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download CD321A~1 documenatation <<
Text preview - extract from the document
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 tampers
with the adjustment, realignment may be necessary.
1.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.TUNER ADJUSTMENT
1. Test & Adjustment Points
Figure 1. Main P.C. Board
-6-
2. AM (MW) IF Adjustment
IF Genescope
IF Adjust for Adjustment
455kHz Maximum L7(See figure 3)
IC101(Pin 13 , 14 ) L4
IN OUT
Unit
455kHz
455kHz
Figure 2.AM(MW) IF Adjustment Connection Diagam Figure 3.AM(MW) IF Curve
3. AM(MW) RF(Coverage & Tracking) Adjustment
NO ITem SG Output Adjust for Adjustment
1 515kHz Maximum L5
2 Coverage 1,650kHz or 1,710kHz(U.S.A) Maximum VC1-3
3 Repeat steps 1 and 2 several times.
4 600kHz Maximum L1
5 Tracking 1,400kHz Maximum VC1-4
6 Repeat step 4 and 5 several times.
OscIlloscope
SSVM
AM Signal generator Test Loop# AM Antenna IC101(Pin 13 , 14 )
Antenna
3.28
Unit IN OUT
GND
60cm
Figure 4.AM(MW) RF Adjustment Connection Diagram
4. FM RF(Coverage & Tracking) Adjustment
NO ITem SG Output Adjust for Adjustment
1 87.35MHz(AX Band:64MHz) Maximum L4
2 Coverage 108.25MHz(AX Band:109MHz) Maximum VC1-1
3 Repeat steps 1 and 2 several times.
4 90MHz(AX Band:68MHz) Maximum L3
5 Tracking 106MHz Maximum VC1-2
6 Repeat step 4 and 5 several times.
Electronic
Voltmeter
Signal Generator PN1
Dummy IC101(Pin 13 , 14 )
8
Unit 3.2
GND GND
Figure 5. FM RF Adjustment Connection Diagram
-7-
3.TAPE DECK ADJUSTMENT
1. AZIMUTH ADJUSTMENT
Deck Mode Test Tape Test Point Adjust for Adjustment
Playback MTT-114 L/R Output R/L Maximum Azimuth adjusting screw
Electronic Dual-trace
Voltmeter synchroscope
Head
Playback Mode
L/R Output
L out
L ch CH1 CH2
Test Tape Unit
MTT-114 R ch GND
R out
Figure 6. Azimuth Adjustment Connection Diagram
3. RECORD BIAS ADJUSTMENT
Deck Mode Test Tape Test Point Adjust for Adjustment
Rec/Pause MTT-5511 Q140 EMITTER 71kHz◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo