jumper from the ac line cord.
LEAKAGE CURRENT HOT CHECK
1. Do not use an isolation transformer for this test. Plug the completely reassembled receiver directly
into the ac outlet.
2. Connect a
1.5k, 1OW resistor
paralleled by a
0.15uF. capacitor
between each exposed
metallic cabinet part and a
good earth ground
such as a water pipe, as shown below.
3. Use an ac voltmeter with at least 5000 ohms/volt sensitivity to measure the potential across the
resistor.
4.
The potential at any point should not exceed 0.75 volts
.
A leakage current tester may be
used to make this test; leakage current must not exceed 0.5milliamp. If a measurement is outside of the
specified limits, there is a possibility of shock hazard. The receiver should be repaired and rechecked
before returning it to the customer.
5
. Repeat the above procedure with the ac plug reversed.
(Note: An ac adapter is
necessary when a polarized plug is used. Do not defeat the polarizing feature of the plug.)
OR
With the instrument completely reassembled, plug the AC line cord directly into a 120V AC outlet.
(Do
not use an isolation transformer during this test.)
Use a leakage current tester or a
metering system that complies with American National Standards Institute (ANSI) C101.1 Leakage
Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7).
With the instrument
AC switch first in the on position and then in the off position, measure from a
known earth ground (metal water pipe, conduit, etc.) to all exposed metal
parts of the instrument (antennas, handle brackets, metal cabinet, screw
heads, metallic overlays, control shafts, etc.), especially any exposed metal
parts that offer an electrical return path to the chassis.
Any current
measured must not exceed 0.5 milliamp.
Reverse the instrument power cord
plug in the outlet and repeat the test. See graphic below.
Содержание MX975D
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Страница 40: ...MAIN SYSTEM EXPLODED VIEW ...
Страница 44: ...Display FR960Product Specifications ...
Страница 45: ...Display FR970Product Specifications ...
Страница 46: ...Display FM Tuner Setup ...
Страница 47: ...Display AM Tuner Setup ...
Страница 48: ...Display Chip Handling Procedures ...
Страница 50: ...Display Overall Block Diagram ...
Страница 51: ...Display ECO 5 Tuner Board Block Diagram ...
Страница 52: ...Display Multi Channel Decoder Block Diagram ...
Страница 53: ...Display Service Test Program ...
Страница 54: ...Display ECO 5 Tuner Adjustment Table ...
Страница 55: ...Dislay MDM Troubleshooting Chart ...
Страница 56: ...All Models 1931 WIRING DIAGRAM ...
Страница 57: ...All Models 1931 FRONT PANEL HEADPHONE BOARD SCHEMATIC ...
Страница 58: ...All Models 1931 FTD DISPLAY PIN CONNECTIONS ...
Страница 59: ...All Models 1931 TUNER BOARD SCHEMATIC EC05 TUNER ...
Страница 60: ...All Models 1931 MULTI CHANNEL DECODER MODULE ...
Страница 61: ...All Models 1931 MAINS SUPPLY BOARD SCHEMATIC ...
Страница 62: ...All Models 1931 MAINS TRANSFORMER SCHEMATIC ...
Страница 63: ...All Models 1931 MONO BD VOLUME CONTROL PART SCHEMATIC ...
Страница 64: ...All Models 1931 MONO BD SUPPLY PART SCHEMATIC ...
Страница 65: ...All Models 1931 MONO BD SOURCE SELECTOR PART SCHEMATIC ...
Страница 66: ...All Models 1931 MONO BD L R CENTER AMP PART SCHEMATIC FR960 ...
Страница 67: ...All Models 1931 MONO BD L R CENTER AMP PART SCHEMATIC FR970 MX975D ...
Страница 68: ...All Models 1931 FRONT PANEL PCB TOP VIEW ...
Страница 69: ...All Models 1931 FRONT PANEL PCB BOTTOM VIEW ...
Страница 70: ...All Models 1931 HEADPHONE FRONT AV LED PCBs BOTH VIEWS ...
Страница 71: ...All Models 1931 MAINS SUPPLY PCB TOP VIEW ...
Страница 72: ...All Models 1931 MAINS SUPPLY PCB BOTTOM VIEW ...
Страница 73: ...All Models 1931 MAINS TRANSFORMER PCBs BOTH VIEWS ...
Страница 74: ...All Models 1931 SCREW TERMINAL PCB BOTH VIEWS ...
Страница 75: ...All Models 1931 P50 RC5 VIDEO SELECTOR PCBs BOTH VIEWS ...
Страница 76: ...All Models 1931 MONO BOARD PCB TOP VIEW ...
Страница 77: ...All Models 1931 MONO BOARD PCB BOTTOM VIEW ...