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REPLACING FUSES & METER LAMPS
Changing the fuse is easy and can be done without any tools and while the DVC is still in a rack.
1) Disconnect the IEC AC mains for safety
2) Rotate the fuse cap anti-clockwise 1/4 turn
3) Remove the fuse and replace it with a new 1 AMP, 250 VOLT, AGC1 type fuse
4) Reconnect the IEC AC mains, turn on the power and meter lamps should once again glow.
If the new fuse also blows, it means there is probably a problem in the Dual Vocal Combo that needs fixing.
Fuses are meant to blow in those situations to protect against further damage including fire and the unpleasant
smell of transformer meltdown. The DVC will need to be sent to the dealer or factory for service.
Changing the meter lamps is pretty easy. These are simple incandescent bulbs chosen for long life but
eventually they will fail. They are always available from Manley Labs but most electronic stores will also have
them (Radio Shack part number 272-1143) and are described as "Midget Screw-Base Lamps", 12 Volts @ 75
mA.
1) Disconnect the IEC AC mains for safety
2) Remove the two small Phillips head screws located at the back which hold the perforated top cover in place.
Slide the cover towards the back to remove it.
A) Locate the meters at the front panel and the two brass nuts on the back which holds a small printed circuit
board to the back of the meters. These are 3/32 nuts which must be loosened and removed to gain access to the
bulbs. The small board should slide back and will present the bulb in its socket.
B) Unscrew the light bulbs anti-clockwise (how many ________ does it take to unscrew a light bulb?) and
screw in the new ones clockwise.
C) Replace the small printed circuit board to the back of the meters and re-attach the small brass nuts. These
should be reasonably tight for good electrical contact but not forced to the point that the meter is damaged or
the small screws on the meter become stripped.
D) Replace the top cover and the two screws that hold it in place, then re-connect the IEC AC mains plug and
turn on the power to check out the new bulbs.
There are no other parts expected to age that are user servicable. Electrolytic Capacitors should probably be
replaced after 10 years in audio gear and some say ICs, transistors and pots should be replaced in 20 years to
keep the unit in optimum condition. This is a general guide for audio gear that is intended to be used for
decades. On the other hand, you can expect to throw away most digital gear after 5 years because in 3 years
new stuff does 10 times more and costs 10 times less. Funny how that stuff ages and fine analog keeps being
used for decades. In 1999 64 megs of memory costs about $100 and is 8 chips on 1 module. In 1974 it took
150,000 chips and cost $3 million bucks and now its worth is nothing. Good Analog is a long term thing.
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