3
RHT-G800
TABLE OF CONTENTS
1.
SERVICING NOTES
................................................
4
2.
GENERAL
...................................................................
5
3.
DIAGRAMS
.................................................................
7
3-1.
Block Diagram – HDMI Section – .................................
8
3-2.
Block Diagram – Signal Processor Section – ..................
9
3-3.
Block Diagram – Amp Section – ..................................... 10
3-4.
Block Diagram – Power Section – .................................. 11
3-5.
Printed Wiring Board – HDMI Board (Side A) – ........... 12
3-6.
Printed Wiring Board – HDMI Board (Side B) – ........... 13
3-7.
Schematic Diagram – HDMI Board (1/2) – ................... 14
3-8.
Schematic Diagram – HDMI Board (2/2) – ................... 15
3-9.
Printed Wiring Board – MAIN Board (Side A) – ........... 16
3-10. Printed Wiring Board – MAIN Board (Side B) – ........... 17
3-11. Schematic Diagram – MAIN Board (1/5) – ................... 18
3-12. Schematic Diagram – MAIN Board (2/5) – ................... 19
3-13. Schematic Diagram – MAIN Board (3/5) – ................... 20
3-14. Schematic Diagram – MAIN Board (4/5) – ................... 21
3-15. Schematic Diagram – MAIN Board (5/5) – ................... 22
3-16. Printed Wiring Board – IO Board – ................................ 23
3-17. Schematic Diagram – IO Board – .................................. 24
4-18. Printed Wiring Board – DISPLAY, TSW Board – ......... 25
4-19. Schematic Diagram – DISPLAY, TSW Board – ............ 26
4-20. Printed Wiring Board – POWER Board – ...................... 27
4-21. Schematic Diagram – POWER Board – ......................... 28
4.
EXPLODED VIEWS
4-1.
Grille Section ................................................................... 41
4-2.
Speaker Unit Section ....................................................... 42
4-3.
Sash (top) Section ............................................................ 43
4-4.
Sash (botom) Section ....................................................... 44
4-5.
Amp Section .................................................................... 45
5.
ELECTRICAL PARTS LIST
.................................. 46
SAFETY CHECK-OUT
(US model)
After correcting the original service problem, perform the follow-
ing 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 microampers). Leak-
age 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)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15
µ
F
To Exposed Metal
Parts on Set
1.5k
Ω
AC
voltmeter
(0.75V)
Earth Ground
