Yamaha PC1602 User manual

PROFESSIONAL
SERIES
POWER
AMPLIFIER
PC1602
OPERATINC MANUAL
YAMAHA

The PC1602 is a high-power sound amplifier, offering more
boost, professional features, sophisticated design and uncom-
promising performance. It not only looks professional, but
demonstrates a level of performance that the most discrimi-
nating listener will find faultless.
This is not an amplifier to be limited to home surroundings.
A sustained output of 160 watts into 8 ohms (for each channel)
produces powerful peaks that enable clean studio monitoring.
Its high level of power handling makes the PC1602 especially
suited for rock and disco sound systems, where longterm sus-
tained power is essential. But this unit doesn't stop at power;
its ultra-low distortion rate, less than 0.007% THD at 1/2 rated
power, is guaranteed to satisfy the most critical listener.
Bass response is polished by a high damping factor of better
than 200 at 1kHz. This lessens the tendency for speaker cone
overshoot, greatly improving the overall response. In addition
to top-notch bass response, the high frequency response extends
well beyond 50kHz, so that extremely complex musical wave-
forms can be accurately reproduced. This is vital especially
where modern synthesizers are concerned, because of their
highly involved output.
Even with these extended frequency ranges, stability is main-
tained. The PC1602 offers stability matching or exceeding any
other amplifier in its class. It handles highly reactive
multi-speaker loads without shutting down or taking off into
spurious oscillation.
The combination of all these features working in ensemble
makes the PC1602 a highly satisfactory amplifier, assuring
the listener of accurate and pleasing performance. No matter
how difficult or complex your needs may be, the PC1602 is
equipped to handle them with professional style and capability.
CONTENTS
SPECIFICATIONS. ................ eee
FRONT PANEL ............ eene
REAR PANEL
PERFORMANCE GRAPHS ..................................
PERFORMANCE OSCILLOGRAPHS ....................
MOUNTING ..
COOLING FAN FILTER MAINTENANCE .............
BLOCK DIAGRAM ........................ rto nnn nune
DIMENSIONS
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SPECIFICATIONS
POWER OUTPUT LEVEL
Continuous average sine wave power with less than
0.0596 THD. 20 Hz to 20 kHz
Stereo, 8 ohms .................................. 160 W + 160 W
Stereo, 4 ohms .................................. 240 W + 240W
Mono, 8 ohms ................................................... 480 W
FREQUENCY RESPONSE
10 Hz to 50 kHz, 8 ohms, 1 W ......................... O +1dB
TOTAL HARMONIC DISTORTION
Stereo 8 ohms, 80 W
20 Hz to 20 kHz ............................. Less than 0.00796
Stereo 4 ohms 120 W
20 Hz to 20 kHz ............................. Less than 0.01596
Mono 8 ohms 240 W
20 Hz to 20 kHz ............................. Less than 0.01596
INTER MODULATION DISTORTION
250 Hz 12.5 kHz mixed 4 : 1
Stereo 8 ohms, 80 W ..................... Less than 0.00596
Mono 8 ohms, 240 W ...................... Less than 0.01%
INPUT SENSITIVITY
Input level which produces 160 W output into
Вота +4 dB (1.23 V rms)
INPUT IMPEDANCE
Balanced and unbalanced inputs maximum attenuator
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DAMPING FACTOR
f=1 kHz. RL=80 ................................. Greater than 200
S/N RATIO
Input shorted @ 12.7 kHz ................................. 107 dB
input shorted @ IHF-A ...................................... 110 dB
SLEW RATE
Stereo 8 ohms .......................... +40 V/usec Full Swing
k Mono 8 ohns............................ +60 V/yusec Full Swing
‘CHANNEL SEPARATION
8 ohms 80 W
TOKPIZ etes a erase oot EP eO AT 90 dB
8 ohms 80 W
20 Hz їо 20 kHz ................. никанын аа. 70 dB
INDICATORS
Pilot EE" RED LED
Protection (Muting ON) .................................. RED LED
Thermal 2.2... ККК ОУ О ОКУ УС Г RED LED
Clipping (1% THD) .......................................... RED LED
Ihre GREEN LED
FRONT PANEL CONTROLS
Power switch ................................ Push-ON/Push-OFF
Input attenuators (one per channel) ......... 31 positions
REAR PANEL CONTROLS
Mode switch ........................................ STEREO/MONO
Pin 1 GND switch (XLR connectors) ............. ON/OFF
Voltage selector switch (general model only)
PROTECTION CIRCUITS
Muting ................ 6 £2 seconds after power turned ON
DC setise aaa a зенан. DC +2 V output voltage
Thermal protection ........ > 85°С heat sink temperature
PC limiter .................................. RL > 2 ohms when ON
COOLING FAN CIRCUIT
Fan ON temp ................ reae > 60°С heat sink temp.
Fan OFF temp ................ < 45°C heat sink temperature
POWER REQUIREMENTS
U.S. & CANADIAN models ................ AC 120 V, 60 Hz
GENERAL model ................... AC220/240 V, 50/60 Hz
POWER CONSUMPTION
U.S. & CANADIAN models ................ 800 W, 1000 VA
GENERAL model ................................................. 800 W
DIMENSIONS
(WxDxH) ылыныы ниди 480 x 431.3 x 140 mm
(18-7/8" x 17" x 5-1/2")
WEIGHT... eei 21.7 kg (47.8 Ibs)
NOTE:CANADIAN models must be operated into 8 ohms
in stereo mode and 16 ohms in mono mode in ac-
cordance with safety regulations.
IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Cord
IMPORTANT. The wires in this mains lead are coloured in accordence with the following code:
BLUE : NEUTRAL
BROWN : LIVE
Asthe colours of the wires in the mains lead of this apparatus may not correspond with the coloured
markings identifying the terminals in your plug proceed as follows:
The wire which is coloured BLUE must be connected to the terminal which is marked with the letter
N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal which is marked with the
letter L or coloured RED.
All specifications subject to change without notice.

FRONT PANEL
Rack
Handle
Rack
Handle
YAMAHA
PROFESSIONAL
POWER AMPLIFIER
CLIP
SIGNAL SIGNAL
THERMAL
M = =
PROTECTION
Q POWER Switch/POWER indicator (Red)
Pressing this switch turns power to the amplifier ON and
causes the power indicator to light. Pressing the POWER
switch a second time turns the unit. OFF.
Q Thermal Indicator (Red)
This indicator lights when the force cooling fan is operating.
Ө PROTECTION Indicator (Red)
Lights for approximately 6+2 seconds after power is
switched on, indicating that the protection circuitry is ac-
tive. The speaker outputs are shut off while this indicator
is lit. If the protection circuitry is activated for any reason
during amplifier operation, the indicator will light and the
speaker outputs will be shut off. Once the cause of pro-
tection activation has been remedied, normal operation
will resume automatically and the protection indicator will
go out.
CHANNEL A
DES
CHANNEL B
don aS d
Q Input Attenuators
These attenuators adjust the sensitivity of the respective
amplifier channel in 31 steps. Attenuation in the fuily
clockwise position is O dB, and о in the fully counter-
clockwise position.
(
Q CLIP Indicators (Red)
The CLIP indicators light when output distortion of the
respective channel exceeds approximately 196. This indi-
cates that the amplifier is clipping due to excessive input
signal levels.
Q SIGNAL Indicators (Green)
The SIGNAL indicators light when output level of the
signals is 2 V or more, in the range of 20 Hz to 20 kHz,
for confirmation of input signal.
o9 Knob Lock Adaptors (Supplied)
The Knob Lock Adaptors prevent accidental alteration of
attenuator settings once the appropriate settings have
initially been made. How to install Knob Lock Adaptors:
pull out the Input Attenuator Knob to insert the Knob Lock
Adaptors into exactly the same place.

REAR PANEL
Cord Reel э ©
— CAUTION ro | TO REDUCE THE ENS
OF ELECTRIC SHOCK. DO NOT REMOVE
COVER. NO USER-: SERVICEABLE PARTS
INSIDE. REFER SERVI
IN AFIN DE REQUIRE
ЕНСЕ IL NE
SE TROUVE A L'INTERIEUR AUCUNE
PIECE POUVANT ETRE REPAREE PAR
APPLIANCE TO RAIN OR MOISTURE.
Er TW
CHANA Er P WIRING М, MAY
NEED USED. (STEREO) ae
b B MAX. AMS OUTPUT
SP. WIR ASS
2 WIRING MAY ВЕ
USED. (MONO)
TT |
Voltage selector
Oo O q (general model only)
@ SPEAKER Output Terminals
The red SPEAKER terminal is connected to the “+” input
terminal of the speaker system used and the black SPEAKER
terminal is connected to the " —" speaker input terminal.
Ө INPUT Connectors (XLR-3-31)
These connectors are generally used as inputs. Pin 1 is
shield, pin 2 is hot and pin 3 cold. Compatible connectors
include Canon XLR-3-12C and Switchcraft 5C-1055A.
Ө INPUT Connectors (XLR-3-32)
Compatible with Canon XLR-3-11C or switchcraft
5C-1056A connectors, these connectors are useful for
sending the input signal to other power amplifiers.
Q PIN 1 GND SW
Couples or decouples the XLR connector earth line (pin
1, shield). Normally ON. In some cases where ground loops
cause excessive hum, turning the ground switch OFF can
interrupt the loop and reduce the hum.
Fuse 9 @ Cord Reel
REMPLACER, UNIQUEMENT
PAR UN FU
Tyee
Cu MAX. RMS OUTPUT SPEAKER
CHAN ELA
IM
U.S. model
©Ө MODE Selector Switch
Determines whether the amplifier is to operate in the stereo
or mono (BTL) mode.
(CHANNEL B)
MONAURAL OPERATION
The PC1602 can easily be adapted for monaural (BTL)
operation by setting the rear-panel MODE switch to
MONO. In the МОМО mode use the channel А input
connectors and channel А attenuator for level control. The
"+" terminal of the speaker system is connected to the
channel A “+” output terminal and the "—" terminal of the
speaker system is connected to the channel B “+” output
terminal. Leave the channel A and B "-" output
(SPEAKER) terminals and channel B input terminals un-
connected.

PERFORMANCE GRAPHS
FREQUENCY RESPONSE LOAD :8 ohms
Po = 1W at 1 kHz
MODE : STEREO
Input balanced
RESPONSE (dB)
SEUNG (Hz) Fig. 1
T.H. DISTORTION
LOAD : 16 ohms
MODE : MONO
Unbalanced input
DISTORTION (%)
T.H. DISTORTION
LOAD :8 ohms
MODE : STEREO
Both channels driven
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TEn. qT Tal ITI Т у
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DISTORTION (9€)
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DAMPING FACTOR
LOAD :8 ohms
MODE : STEREO
DAMPING FACTOR
ГТ T E. T |
50 pt HH Панне
ШОТ 111
100 10k
FREQUENCY
(Hz)
Fig.
4:
POWER
BAND
WIDTH
THD
:
0.05%
LOAD
:8
ohms
MODE : STEREO
Both channels driven
OUTPUT POWER (W)
o о
= THI L—- rui
HI Hi u H
100 10K
5 (Hz)
Fig. 5

PERFORMANCE OSCILLOGRAPHS | О
20 Hz SQUARE-WAVE RESPONSE
TOTAL HARMONIC DISTORTION 20 kHz SINE WAVE...
M LOAD:8Q __
мМ E:STEREO
lli Fig. 6 x x ig: 10
SLEW RATE
essentiae
Fig. 7
.20 kHz SQUARE-WAVE RESPONSE... RISE TIME `
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TOTAL HARMONIC DISTORTION 1 kHz SINE WAVE
LOAD:80
MODE:STEREO|
Ро = 80W
Fig. 9
` In each photo, output wavef, per and input waveform is lower:
* Horizontal and vertical sca each photo-are optional. But the scales in the
photo of rise time are 0.5V/Div (vertical) and Tyusec/Div (horizontal).
* MODE STEREO LOAD 8 ohms.

MOUNTING
Shelf Mounting
The PC1602 can be used on any flat, level surface as long
as there is adequate ventilation. Do not remove the
amplifiers feet as this would block airflow through the
bottom panel.
Permanent-installation Rack Mounting
The PC1602 can be mounted in any standard 19” electronic
equipment rack. The rear panel of the rack should be left
open to promote smooth airflow. Cooling fans are required
for rack- mounted PC1602’s, if they must produce extremely
high average power output (i.e. stereo operation into
4-ohm loads or mono operation into an 8-ohm load). Refer
to the diagrams to the right for the ideal cooling fan con-
figuration.
* One unit of PC1602 demands one cooling fan
unit.
" S
Portable
Rack
Mounting
ie
S
a
Road
cases
must
be
durable
enough
to
withstand
rough
i
xs
handling
and
airline
travel.
Secure
the
back
end
of
the
Fan
unit
"O73
PC1602 side panels to the rack with the screws provided,
and provide cooling fans (like those shown to the right) CAUTION!
if
ventilation
is
restricted.
If
unit(s)
are
to
be
used
in
a
rack
mounted
installation,
it is recommended that fan cooling be installed.
Without fan cooling, units could be damaged from
excessive temperature conditions.
The minimum required airflow rate for fans should
Shelf be 2 x 19 cubic feet per minute (CFM). Use only
fans with the above specification.
The following are some examples of fans with the
proper specifications:
Type/ Mode
ORIENTAL А
MOTOR CO LTD MU825S-23 or equivalent
Airflow Rate
Side Panel Support Screws
Use the both screw holes on each side panel. Use only
the supplied screws (millimeter thread).
Rack mounting with cooling fans
Fan Unit
* The fan unit shown uses two fans, each with a maximum
volume of 19 CFM (cubic feet per minute) and a
maximum pressure of 5 mm H20.
* Slits should be provided on the top and bottom sides
for air circulation.

COOLING FAN FILTER MAINTENANCE
The filter element is removed and cleaned as follows.
1. Remove the two upper screws on the rear panel with
a 3 mm Allen hexagonal wrench.
Remove the filter cover.
2. Remove filter element and wash with plain water.
Detergent may also be used if the filter is exceptionally
dirty.
3. Dry the filter thoroughly. NEVER REPLACE THE
FILTER WHILE IT IS WET!
4. Replace the filter element and filter cover.
estate
QAO
AAY A
e" $a ery
2s p
P di
W < Filter Element
Filter Cover
BLOCK DIAGRAM
CLIP
DETECTOR
SIGNAL
INDICATOR
AMP
CH-A o
INPUT
CH-A OUTPUT
VOLTAGE
amp CURRENT
AMP
PROTECTION
CIRCUIT
PROTECTION
p
VOLTAGE
AMP CH-B OUTPUT
CH.B о
INPUT
LEVEL
CURRENT AMP
CLIP
DETECTOR
CLIP SIGNAL
iNDICATOR
AMP

DIMENSIONS
435
(17-1/8")
Unit : mm (inch)
SERVICE
The PC1602 is supported by Yamaha’s worldwide network
of factory trained and qualified dealer service personnel.
In the event of a problem, contact your nearest Yamaha
dealer.