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SECTION 1
SERVICING NOTES
1.
SERVICING NOTES
...............................................
3
2.
GENERAL
Location of Controls .......................................................
4
Setting the Time ..............................................................
6
3.
DISASSEMBLY
.........................................................
7
4.
DIAGRAMS
4-1. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 11
4-2. Printed Wiring Board – BD Board – .............................. 12
4-3. Schematic Diagram – BD Board – ................................ 13
4-4. Printed Wiring Boards – CD MOTOR Section – .......... 14
4-5. Schematic Diagram – CD MOTOR Section – .............. 15
4-6. Printed Wiring Board – AUDIO Board – ...................... 16
4-7. Schematic Diagram – AUDIO Board – ......................... 17
4-8. Printed Wiring Board – LEAF SW Board – .................. 18
4-9. Schematic Diagram – LEAF SW Board – ..................... 18
4-10. Printed Wiring Board – MAIN Board – ........................ 19
4-11. Schematic Diagram – MAIN Board (1/3) – .................. 20
4-12. Schematic Diagram – MAIN Board (2/3) – .................. 21
4-13. Schematic Diagram – MAIN Board (3/3) – .................. 22
4-14. Printed Wiring Board – PANEL FL Board – ................. 24
4-15. Schematic Diagram – PANEL FL Board – .................... 25
4-16. Printed Wiring Board – PANEL VR Board – ................ 26
4-17. Schematic Diagram – PANEL VR Board – ................... 27
4-18. Printed Wiring Boards – TC-A/TC-B/CD-L/
4-3. Schematic Diagram – BD Board – ................................ 13
4-4. Printed Wiring Boards – CD MOTOR Section – .......... 14
4-5. Schematic Diagram – CD MOTOR Section – .............. 15
4-6. Printed Wiring Board – AUDIO Board – ...................... 16
4-7. Schematic Diagram – AUDIO Board – ......................... 17
4-8. Printed Wiring Board – LEAF SW Board – .................. 18
4-9. Schematic Diagram – LEAF SW Board – ..................... 18
4-10. Printed Wiring Board – MAIN Board – ........................ 19
4-11. Schematic Diagram – MAIN Board (1/3) – .................. 20
4-12. Schematic Diagram – MAIN Board (2/3) – .................. 21
4-13. Schematic Diagram – MAIN Board (3/3) – .................. 22
4-14. Printed Wiring Board – PANEL FL Board – ................. 24
4-15. Schematic Diagram – PANEL FL Board – .................... 25
4-16. Printed Wiring Board – PANEL VR Board – ................ 26
4-17. Schematic Diagram – PANEL VR Board – ................... 27
4-18. Printed Wiring Boards – TC-A/TC-B/CD-L/
CD-L2/CD-R/CD-R2 Boards – ...................................... 28
4-19. Schematic Diagram – TC-A/TC-B/CD-L/
CD-L2/CD-R/CD-R2 Boards – ...................................... 29
4-20. Printed Wiring Boards – FRONT INPUT/
HEADPHONE/MIC Boards – ........................................ 30
4-21. Schematic Diagram – FRONT INPUT/
HEADPHONE/MIC Boards – ........................................ 31
4-22. Printed Wiring Board – PA Board – .............................. 32
4-23. Schematic Diagram – PA Board – ................................. 33
4-24. Printed Wiring Boards – TRANS/SUB TRANS
4-23. Schematic Diagram – PA Board – ................................. 33
4-24. Printed Wiring Boards – TRANS/SUB TRANS
(LX5/LX30/LX50) Boards – .......................................... 34
4-25. Schematic Diagram – TRANS/SUB TRANS
(LX5/LX30/LX50) Boards – .......................................... 35
5.
EXPLODED VIEWS
................................................ 38
6.
ELECTRICAL PARTS LIST
............................... 46
TABLE OF CONTENTS
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15
µ
F
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
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