Nad AV 711 Service Manual

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SERVICE MANUAL

SERVICE SAFETY PRECAUTIONS (UL)

1. Use exact replacement parts for critical locations marked A"
2. Return lead dress to original position and reinstall protective covers.
3. Before returning to customer, test for shock hazard; use either mothod A or B:

A. Leakage test cold":
1. Unplug the AC cord; turn power switch ON.
2. Connect one lead of High Voltage Insulation Tester to both prongs of the AC plug.
3. Touch other lead to all exposed metal parts.
4. Impedance measurement must be 03-50 Megohms.

B. Leakage test, live :
1. Plug unit directly into the AC outlet: do not use isolation transformer.
2. Connect one lead of the Leakage Current Tester to earth ground.
3. Touch other lead to all exposed metal pans.
4. Leakage measurement must be less than 0.5 milliamps.

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SERVICE SAFETY PRECAUTIONS

2. Memory preservation

_l __ This symbol located near the fuse This unit does not require memory preservation batteries.
indicates that the fuse used is fast A built-in memory power back-up system preserves contents

operating type. For continued protection against fire hazard, of the memory during power failures and even when the unit

replace with same type fuse. For fuse rating refer to the is unplugged. The unit must be plugged in and the power

marking adjacent to the symbol. switch turned on and off once in order to charge the back-up

system. Note that since Lhis is not a permanent memory the

1. Replacing the fuses

Circuit No. Part No. Description power switch must be turned on and off a few times each
F901 5732-01101502 Fuse. 5A 125V/250V month to keep the back-up system operative. The period of
time during which memory contents are preserved after power
5732-01601252 Fuse, T2.5AL 125V/250V has last been turned off varies depending on climate and
placement of the unit. On average, memory contents are
F902 5732-01101202 Fuse, 2A l25V/250V protected over a period of 3 to 4 weeks (a minimum of 2
weeks) after the last time power has been turned off. This
5732-01601122 Fuse, T1.25A, 125V/250V period is shorter when the unit is exposed to very high
humidity or used in an area with an extremely humid
climate.
F903 ,F904 5732-01101802 Fuse, 8A 125V/250V
3. Safety-check out
5732-01601632 Fuse, T6.3AL 125V/250V (Only U.S.A. model)
After correcting the original service problem perform the
following safety check before releasing the set to the
customer.

NOTE: : USA Canadian model only
: U.K.modc| only
: Australian model only
2 European model only

Connect the insulating-resistance tester between the plug of
power supply cord and the screw on the back panel.
Specifications : 3.3 Mohmi 10% at 500V.

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