—3 —
After correcting the original service problem, perform the
following safety checks 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
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
WT-540A. Follow the manufacturers’instructions to use these
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”indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15 µF1.5 kΩ
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
TABLE OF CONTENTS
1. GENERAL
Displaying the spectrum analyzer ........................................... 5
Setting the clock ...................................................................... 5
2. DISASSEMBLY
2-1. Side Plate ............................................................................. 6
2-2. Cabinet, Rear ....................................................................... 6
2-3. Changer Assy, Front ............................................................ 7
2-4. Key (A) Board, Key (B) Board and LED Board ................. 7
2-5. Display Board ..................................................................... 8
2-6. Cassette Mechanism Deck .................................................. 8
2-7. Main Board and Transformer, Power .................................. 9
2-8. CD Mechanism Deck .......................................................... 9
2-9. Base, Changer ................................................................... 10
2-10. Optical Pick-up ............................................................... 10
3. MECHANICAL ADJUSTMENTS ............................... 11
4. ELECTRICAL ADJUSTMENTS
Tape Section .......................................................................... 11
Tuner Section ......................................................................... 13
CD Section ............................................................................ 14
5. DIAGRAMS
5-1. Circuit Boards Location .................................................... 15
5-2. Block Diagram –CD Section–........................................... 17
5-3. Block Diagram –Main Section–........................................ 19
5-4. Printed Wiring Board –Main Section–.............................. 21
5-5. Schematic Diagram –Main Section (1/4)–........................ 23
5-6. Schematic Diagram –Main Section (2/4)–........................ 25
5-7. Schematic Diagram –Main Section (3/4)–........................ 27
5-8. Schematic Diagram –Main Section (4/4)–........................ 29
5-9. Schematic Diagram –CD Section–.................................... 31
5-10. Printed Wiring Board –CD Section–................................. 33
5-11. Schematic Diagram –Key Section–................................... 35
5-12. Printed Wiring Board –Key Section–................................ 37
5-13. Schematic Diagram –Display Section–............................. 39
5-14. Printed Wiring Board –Display Section–.......................... 41
5-15. Schematic Diagram –Power Section–............................... 43
5-16. Printed Wiring Board –Power Section–............................ 45
5-17. IC Pin Descrption .............................................................. 47
5-18. IC Block Diagrams ............................................................ 49
6. EXPLODED VIEWS
6-1. Cabinet Section ................................................................. 54
6-2. Front Cabinet Section ........................................................ 55
6-3. Rear Cabinet Section ......................................................... 56
6-4. Tape Mechanism Deck Section-1 (MF-PHCZ10) ............. 57
6-5. Tape Mechanism Deck Section-2 (MF-PHCZ10) ............. 58
6-6. CD Changer Section-1 ...................................................... 59
6-7. CD Changer Section-2 ...................................................... 60
6-8. Optical Pick-up Section (KSM-213CCM) ........................ 61
6-9. Speaker Section ................................................................. 62
7. ELECTRICAL PARTS LIST......................................... 63
SERVICE NOTE
When the CD block is going to be inspected, be sure to
connect beforehand the jig (J-2501-020-A) between the CD
board (CNP706) and the DISPLAY board (CNP802).
