QSC PowerLight Series, Техническое и сервисное руководство

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6 QSC Audio Products, Inc.
TD-000083-00
Solder
Solder
Tweezers
Solder
Let the solder harden to tack the
component in place.
4. Fully solder the other end of the
component to its pad. Let the
solder harden (Figure 1.5).
5. Fully solder the tacked end of
the component to its pad (Figure
1.6).
Three-terminal
components (transistors,
etc.)
Removal
1.
With a soldering iron and solder
braid, remove as much solder as
possible from the middle
terminal of the component.
2. With a soldering iron in each
hand, hold one tip on the solder
at the terminal at one end of the
component and the other tip on
the terminal at the other end.
3. When the solder on both ends
melts, grip the component between the two tips and lift it from
the circuit board. You might need to quickly touch the pad on
the middle terminal with a soldering iron to melt any remaining
solder that might be holding the component down.
4. Use solder braid and a soldering iron to remove the solder from
the three pads.
Insertion
1.
With a soldering iron and 60/40 or 63/37 eutectic-type solder,
melt just enough solder onto one pad to create a small mound
of solder.
2. Grasp the component with tweezers. Melt the small mound of
solder with the iron and place the component in the correct
orientation across the three pads and press it flat against the
circuit board, with one terminal of the component pressed into
the melted solder.
3. Hold the component in place and take the soldering iron away.
Let the solder harden to tack the component in place.
4. Fully solder the other terminals of the component to their pads.
Let the solder harden.
5. Fully solder the tacked terminal of the component to its pad.
Multi-pin components (ICs, etc.)
Removal
Removing a multi-pin SMT component is a delicate procedure.
Ideally, you should use a soldering iron with an attachment that
allows you to heat all the pins simultaneously.
If such a soldering device is not available, use this procedure:
1. Use a soldering iron and solder braid to remove as much solder
as possible from the pins of the component.
2. With fine tweezers, carefully try to lift each pin to see if it’s
free. If it’s not, touch it with the tip of the soldering iron and if
necessary, use the solder braid to remove the remaining solder.
3. Repeat the process until all the pins are free and you can
remove the component.
Insertion
1.
With a soldering iron and 60/40 or 63/37 eutectic-type solder,
melt just enough solder onto one pad to create a small mound
of solder. It is usually easiest to use a pad that corresponds to
one of the end or corner pins of the component.
2. Grasp the component with tweezers. Melt the small mound of
solder with the iron and place the component in the correct
orientation upon its pads and gently press it flat against the
circuit board, with the appropriate terminal of the component
pressed into the melted solder.
3. Hold the component in place and take the soldering iron away.
Let the solder harden to tack the component in place.
4. Fully solder the other terminals of the component to their pads.
Let the solder harden.
5. Fully solder the tacked terminal of the component to its pad.
1.4 Series description
QSC’s PowerLight Series amplifiers are high-performance
professional audio products, designed primarily for live and touring
sound and large-scale installations.
This service manual covers the three most powerful models
developed for the PowerLight Series: the PowerLight 6.0 II, the
PowerLight 6.0
PFC , and the PowerLight 9.0 PFC . Each one has two
audio channels and is three rack spaces tall. See page 2 for
complete specifications.
The PowerLight 6.0 PFC and PowerLight 9.0 PFC feature power
supplies with power factor correction, which reduces peak current
demand by drawing power throughout the AC voltage waveform.
The PowerLight 6.0 II has power supplies that don’t have PFC but
are simpler and less expensive to manufacture.
The first four digits of the amplifier’s serial number indicate the
month and year of manufacture in MMYY formay. For example,
0701xxxxx = July 2001). A serial number that starts with “13”
indicates the amplifier was made during the model’s beta
production. The PowerLight 9.0
PFC entered production in May 1998.
The PowerLight 6.0 PFC followed in March 1999, and the
PowerLight 6.0 II, in August 2002. Many PowerLight 6.0 PFC
amplifiers, however, have been converted by QSC Technical
Services into PowerLight 6.0 II amplifiers, so you may encounter
PowerLight 6.0 II amplifiers with serial number date codes that
precede the model’s actual release date.
The PowerLight 6.0 PFC and PowerLight 9.0 PFC ceased production in
March 2004.
Figure 1.3.
Figure 1.4.
Figure 1.5.
Figure 1.6.