Back Panel
From left to right:
IEC Mains Socket, Mains Voltage Selector, Fuse Plate, Serial Plate, Impedance Selector and Speaker Jacks.
1. IEC Mains Socket: as with all equipment that uses wall voltage to operate, plug your mains lead from this IEC socket to the
mains socket in order to power up the amp.
2. Voltage Selector: As a highly professional amplifier that is commonly used by touring bands who travel, this Custom
Hiwatt includes a voltage selector so it can be used in just about every country around the world. This selector needs to
be set to the proper Mains voltage in your country. SETTING THIS SWITCH INCORRECTLY CAN CAUSE DAMAGE TO THE
AMPLIFIER AND WILL VOID THE WARRANTY!
Note: when changing the voltage on the voltage selector the corresponding fuse must also be changed. See Back Panel
#3- Fuse Plate for more info.
3. Fuse Plate: This amplifier includes two fuses to protect the amplifier. One or both fuses will “blow” if there is something
wrong inside or outside the amplifier. If a fuse blows, please take the amplifier to a qualified amplifier technician
for service. Fuses with proper ratings should always be used. Do not use fuses of high ratings or bypass the fuse by
putting something in the fuse holder that will bypass the fuse. Doing so will potentially cause damage to the amp, can be
dangerous to operate the amplifier and VOID THE WARRANTY! Warning - make sure your mains lead is unplugged from
the wall receptacle or IEC mains socket (back panel #1) while working with fuses.
• Please check the voltage selector is correctly set and adjust the fuses if necessary (see chart below)
• When selecting 230 or 240 volts on Voltage Selector (back panel #2) make sure the fuse in the MAINS Fuse
holder is a ‘time delay (slow-blow) MAINS Fuse rated at 3A or 3.15 A (T 3.15 ) - for 100w Custom
• When selecting 100V or 115V on Voltage Selector (back panel #2) make sure the fuse in the MAINS Fuse
holder is a ‘time delay (slow-blow) Mains Fuse rated at 6Aor 6.3A (T 6.3) - for 100w Custom
• The HT fuse in HT fuse holder is always a FAST BLOW 3A or 3.15A (F 3.15) - for 100w Custom
4. Serial Plate: this is where you will find the model and serial numbers of your amp as well as some technical info.
Please register this amplifier hiwatt.co.uk .
5. Impedance Selector: The impedance selector switch allows you to set the amp to 4, 8 or 16 ohms. Set this switch correctly
depending on your speaker cabinet(s) impedance. Setting this switch incorrectly can cause damage to the amp and VOID
YOUR WARRANTY! There is more information on how to set impedance in the following section.
6. Speaker Jacks: There are two parallel speaker jacks for convenience in setting up your amplifier with your speaker
cabinets. There is more info on how to hook up your speaker cabinets on the next page.
Hiwatt Electronics Limited recommends the use of Ceramic ‘Anti-Surge’ fuses for the MAINS Fuse if available
6
Hiwatt.co.uk
Custom Shop Model
20w Custom
LRD MKII
LRJ MKII
LRP MKII
Studio Stage Custom
50w Custom
100w Custom
200w Custom
400w Custom
100V/115V FUSE RATING GUIDE
Country Supply Voltage
100v / 115v
100v / 115v
100v / 115v
100v / 115v
100v / 115v
100v / 115v
100v / 115v
100v / 115v
100v / 115v
Mains Fuse Rating (amps)
6A or 6.3A time-delay (T)
6A or 6.3A time-delay (T)
6A or 6.3A time-delay (T)
6A or 6.3A time-delay (T)
6A or 6.3A time-delay (T)
6A or 6.3A time-delay (T)
6A or 6.3A time-delay (T)
10A time-delay (T)
10A time-delay (T)
HT Fuse Rating (amps)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
3A or 3.15A fast-blow (F)
3A or 3.15A fast-blow (F)
3A or 3.15A fast-blow (F)
Custom Shop Model
20w Custom
LRD MKII
LRJ MKII
LRP MKII
Studio Stage Custom
50w Custom
100w Custom
200w Custom
400w Custom
230V/240V FUSE RATING GUIDE
Country Supply Voltage
230v / 240v
230v / 240v
230v / 240v
230v / 240v
230v / 240v
230v / 240v
230v / 240v
230v / 240v
230v / 240v
Mains Fuse Rating (amps)
3A or 3.15A time-delay (T)
3A or 3.15A time-delay (T)
3A or 3.15A time-delay (T)
3A or 3.15A time-delay (T)
3A or 3.15A time-delay (T)
3A or 3.15A time-delay (T)
3A or 3.15A time-delay (T)
5A time-delay (T)
5A time-delay (T)
HT Fuse Rating (amps)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
1A fast-blow (F)
3A or 3.15A fast-blow (F)
3A or 3.15A fast-blow (F)
3A or 3.15A fast-blow (F)
HT 3A
MAINS 3A/230V
Fuse P
lat
e for DR 103 amplifier
1
2
3
4
5
6
Illust. 2
Made in England by Hiwatt Electronics Ltd.
MAINS 3A/230V
HT 3A
