Tokyo Hy Power Labs HL-25KFX High Power Amplifier User Manual users manual

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INSTRUCTION MANUAL
HF LINEAR POWER AMPLIFIER
MODEL : HL-2.5KFX
1. Introduction
Thank you for purchasing the HL-2.5KFX. This compact and lightweight
desktop HF linear power amplifier has a maximum input power of 2.9 kW. Our
solid-state broadband power amp technology makes it the smallest and lightest
in the industry.
Typical output power is 1.5 kW PEP/SSB with the drive power of 85-90 W. The
built-in band decoder will let you forget about the band setting when the amplifier
is connected to your modern radio through such band data cables as ICOM CI-V,
DC voltage (ICOM, Yaesu), and RS-232C (Kenwood). All the data cables are
included in your amplifier for your convenience.
2. Cautions
2-1
Unpack the amplifier, check the fan guard at the rear panel Fan to see if
there is any damage caused by the physical shock during the transportation. Fan
blades must be free to rotate when powered.
The amplifier is cooled by forced airflow. Several inches of clearance on the top
and the rear wall are necessary to allow for smooth air intake into the fan. Do not
block the air vents on the top cover.
2-2
Keep the amplifier out of direct sunlight, in a cool dry environment.
2-3
Internal high voltages, (AC, DC and RF), are present at all times, ON
AIR or OFF. Internal access should be limited to avoid injury.
2-4
Turn off the AC main power immediately upon any unusual sounds,
sights or odors. Check the multimeter readings of Vd and Id, the fuses and all
cable connections around the amplifier. Please notify the dealer or the factory of
any problems.
2-5
For your safety, do not operate the amplifier without adequate grounding.
A proper ground connection will result in peak performance and stability, in
addition to reduced RF strays or noises.
2-6
To eliminate the RF interference to such home appliances as TV, FM
radio, telephone sets, etc., it is recommended that clamp-on ferrite cores be
inserted at both ends of the remote control cable, ALC cable, coaxial jumper
cable, and antenna cables, as needed. Also, a common mode AC line filter (near
the AC outlet), and in-line low pass filters on the antenna coaxial cable, (as
necessary), are recommended.
2-7
The amplifier has fast acting sophisticated protection circuits controlled
by the latest microprocessor technology. Please note, however, any such actions
that cause the same fault to occur repeatedly, will lead to failure of the valuable
final power FET transistors. Also note that the full power CW (or carrier) drive
under the erroneous MANUAL BAND SET leads to the failure of the final power
FET’
s (See page 11, Section 7. Connection). In this sense, it is highly
recommended that the amplifier is connected to the radio with supplied Band
Data Cable.
2-8
Before checking inside the amplifier, be sure to wait a few minutes for
the high DC voltage to discharge (monitor Vd meter reading). The internal
potentiometers for RF power detector, protection circuits, FET bias voltage
circuit, etc., are precisely adjusted at the factory, and should not be altered.
Doing so, would require readjustment with precision measuring instruments.
2-9
The primary power transformer is factory pre-wired for AC 240 V
operation. (See page6, Section 5. AC Line Voltage) Be sure to verify your AC
line voltage before you plug the AC power cord into the outlet.
2-10
Before powering on the amplifier, be sure to connect a dummy load (50
ohms, 1.5 kW min.) or a well-adjusted antenna to the output terminal. Operating
without any load will cause extreme stress to the RF power FET’
s, although
protection circuits should work under critical conditions.
2-11
Required drive power is slightly less than 100 W to obtain the full 1.5 kW
output. Do not attempt to operate with excessive drive from a high power
transceiver. Transmitting high drive RF (over 100 W) into the amplifier will void
the warranty.
2-12
Keep the aluminum heat sink and air openings free from dust and
blockages. Periodic cleaning will prevent degraded cooling efficiency.
2-13
For long continuous operation in RTTY/FM modes, it is recommended
you reduce the RF drive levels by 20% to 30% lower output than CW/SSB
modes.
2-14
To prevent damage to the precision electronic components, avoid
extreme physical shock to the amplifier. If factory service is required, the
amplifier MUST be shipped using the original box and packaging materials.
3. Features
3-1
Our solid-state broadband design engineers worked to make the
HL-2.5KFX, the lightest and most compact 1.5 kW HF amplifier in the industry.
This world-class compact 1.5 kW HF amplifier is the easiest to handle and
operate.
3-2
The amplifier is equipped with a newly developed band decoder. The
amplifier’
s decoder changes bands automatically as the data signal is received
from the associated HF transceiver’
s frequency bands.
3-3
The amplifier’
s main PA section includes 2 high power MOS FET
ARF1500’
s by Microsemi, resulting in 1.5 kW PEP (SSB max.). The amplifier’
broadband characteristics require no further tuning once the operating band is
selected.
3-4
The amplifier allows operation in full break-in CW mode due to the use of
the amplifier’
s high- speed antenna relays (made by Panasonic/Matsushita).
3-5
With the unique duct structure design and the powerful blower fan, the
aluminum heat sink block for RF PA module (and other components), are
effectively cooled. The fan’
s quiet operation allows for even the weakest DX
signals to be heard.
3-6
The amp utilizes an advanced 16 bit MPU (microprocessor) to run the
various high speed protection circuits such as overdrive, high antenna SWR, DC
overvoltage, band miss-set etc.
3-7
This amplifier is compatible with AC 220 V and 240 V (200/230/250 V
included). See the illustration in the AC Power Section for changing primary
wiring of the power transformer.
3-8
For the safety of the operator, an Interlock system is employed. The AC
power is shut down if the top cover is removed, and the automated safety
interlock is activated.
3-9
An analog multimeter allows the operator to monitor Pr (Reflected
power), Vd (Drain voltage of power FET), Id (Drain current) and ALC voltage.
3-10
For future expansion, the amplifier rear panel is equipped with a control
cable connection socket, this is for the upcoming model HC-1.5KAT, auto
antenna tuner by Tokyo Hy-Power Labs. in 2007.
4. Specifications
Frequency
1.8 ~ 28 MHz all amateur bands including WARC
bands
Mode
SSB, CW, RTTY
RF Drive
85W typ. (100W max.)
Output Power
1.5 kW PEP/CW (typ.)
(1.2 kW on 28 MHz band)
Matching Transceivers for Auto Band Decoder
Most ICOM, Yaesu, Kenwood
Drain Voltage
120 V (when no RF drive)
Drain Current
25 A max.
Input Impedance
50Ω (unbalanced)
Output Impedance
50Ω (unbalanced)
Final Transistor
ARF1500 x 2 (MOS FET by Microsemi)
Circuit
Class AB push-pull
Cooling Method
Forced Air Cooling
MPU
PIC 18F452-I/P
Multi-Meter
Output Power
Pf 2.5 kW
Reflected Power Pr 250W
Drain Voltage Vd 150V
Drain Current
Id 40A
Input/Output Connectors :
UHF SO-239 with low loss Teflon insulator
AC Power
AC 240 V (200/220/230/250 V) 15A max.
AC Consumption
3 kVA max. when TX
Dimension
325 x 145 x 405 mm (W x H x D)
12.3 x 5.7 x 15.9 inches
Weight
Approx. 25.2 kgs. or 57.3 lbs.
Accessories
AC Power Cord
x1
RCA Plug
x2
Band Decoder Cable x 3
Spare Fuse 12 A (for AC 230V line) x 2
Spare Fuse 1A (Miniature Fuse)
x3
User Manual x 1
Optional Items
Auto Antenna Tuner (HC-1.5KAT)
High Power Cooling Fan (HXT-2.5KF for high duty
cycle operation)
5. AC Line Voltage
5-1
The amplifier is designed to work with AC 240 V (200- 250 V).
5-2
The correct AC plug (not included in the package), must be obtained
locally due to the AC plug variations worldwide.
5-3
The AC voltage has been factory preset for 240 V use (or as requested
by the customer at the time of order). See the other illustration for AC voltages
other than 240 V. For your safety, before making these adjustments, be sure to
pull the AC plug from the AC outlet to avoid injury.
Guide for Tap Selection
AC Line
Tap 1
Tap 2
200V (195V-205V)
0V
200 V
210V (205V-215V)
10 V
220 V
220V (215V-225V)
0V
220 V
230V (225V-235V)
10 V
240 V
240V (235V-245V)
0V
240 V
250V (245V-255V)
0V
250 V
T1 (Main Power Transformer)
AC-L
Tap 2
250V
240V
220V
200V
Secondary
Winding
AC-N Tap 1
10V
10V
0V
Terminal Board Connection
AC200V
AC210V
AC220V
AC230V
AC240V
AC250V
240V
220V
200V
240V
220V
200V
240V
220V
200V
240V
220V
200V
240V
220V
200V
250V
240V
220V
200V
10V
0V
10V
0V
10V
0V
10V
0V
10V
0V
10V
0V
6-A
Front Panel Description
⑥
⑦
①
①POWER
②
⑧
⑨
③
④
⑤
Main power switch to turn AC power on and off.
LED (green) lights when turned on.
②OPER.
OPERATE/STAND-BY switch. At OPERATE, the amplifier is
ready to go into ON AIR (TX) mode and at STBY, it is on
STAND-BY mode.
③METER
To change the multimeter scales. Meter reads Pr, Vd, and Id,
and ALC.
④BAND-AUTO/MAN’
To select band switching methods AUTO or MANUAL. When
using AUTO, the manufacturer for the transceiver in use
should be selected. When the band data cable is not used,
MANUAL should be selected. (See page 9, ⑤TRXSEL and
③CONT for Band Data cable Connection)
⑤BAND-MAN’
L Rotary switch for band change in manual mode. While the
transceiver is on Receive (RX) mode, turn to select the
desired frequency band to operate. The switches will not work
when the transceiver and the amplifier are in Transmit (TX)
mode.
⑥METER(PF)
Meter to read forward output power, PF. Full scale is 2.5 kW,
and it reads average power.
⑦MULTIMETER
PR(Reflected power from antenna), VD (FET drain voltage),
and ID(FET drain current) and ALC voltage are shown on the
scale as selected by ③METER select switch.
Full scales are; PR:250 W, VD: 150 V, ID: 40 A, ALC: -10V.
⑧ON AIR, FAN, ID, PROT(LED)
ON AIR
Lights when the amplifier is in transmit(TX) mode.
FAN
Lights when cooling fan is running at high speed.
When the heat sink temperature reaches 40℃, cooling fan
speed will continuously increase to enhance cooling
capacity.
It runs at full speed when 65℃ is reached.
ID
Excessive ID Indicator (25 A). Depending on the band and
antenna situation, high drain current may flow into FET’
s. If
25 A is exceeded, this LED flickers and/or lights to indicate
that high ID is being drawn (This light does not necessarily
mean a failure of the amplifier. However, if it lights too often,
or too long, it is possible the driver power should be reduced
and the antenna should be checked for SWR, to avoid
stress to the FET’
s.).
PROT
Lights when protection circuit shuts down the amplifier.
Various protection circuits are built in such as Over-drive,
Band mis-set, high Ant-SWR, Over-temperature etc.
Detailed explanations will follow.
Band
Band Change Mode
CI-V (example)
*YSU is displayed for
Yaesu radio, and KEN
for Kenwood’
s.
Amp. Status
⑨LCD Panel
Heat Sink Temp.
Displays modes of operation and protection circuit.
6-B
Rear Panel Description
①
②
③ ④ ⑤
⑥
⑦
⑧
⑨
⑩ ⑪ ⑫
⑬
①ANT A
RF Output Connector. Connect the coax cable to the antenna.
②INPUT
RF Input Connector. Connect the coax jumper cable from the
transceiver.
③CONT
D-Sub (15pin) Socket. Connect the band data cable to the
transceiver.
④TUNER
DIN Socket. Connect the control cable from External Auto
Antenna Tuner, HC-1.5KAT.
⑤TRXSEL
Switch to select the transceiver manufacturer (i.e. ICOM, Yaesu,
Kenwood).
⑥GND
Ground Terminal.
⑦⑧FUSE
A pair of fuses for AC Mains. 250 V/12 A glass fuse.
(Self extinguish type.)
⑨AC POWER 230 V AC Mains Socket. Socket for the AC power cord. (Socket
is EMI filtered.)
⑩ALC ADJ.
Potentiometer to adjust ALC voltage level. Minus 10 V is
available at maximum, when turned full counter-clockwise.
Factory setting is 0 volts, with the pot turned full clockwise.
(See page 16, Section 9. ALC Connection for more details.)
⑪SEND
RCA Jack. Connect the control cable from the ACC terminal (or
SEND, TX GND etc.) of the transceiver. Electrical conditions
are 12 V DC of open voltage at receive mode (RX), and short
current of 35 mA at transmit mode (TX).
⑫ALC
RCA Jack for ALC Voltage Output. Negative DC voltage
appears at the center pin, which is fed back to the ALC terminal
of the transceiver. ALC is used to keep the amplifier output
power at certain limits. Also it is useful when the transceiver
output power is higher than 100 W (See page 16, Section 9.
ALC Connection). Also consult your HF transceiver€31
s user
manual.
⑬FAN POWER Socket to connect DC cord plug of the cooling fan.
6-C
Top View
Cooling Fan
Interlock
Switch
for AC Mains
Output Low Pass Filter
Terminal for
Primary Winding Taps
RF Power
Amp
and Heat SInk
Power Transformer
Rectifier
Front Panel Side
10
7. Connection
7-1
Connection to Transceiver and Tuner
HC-1.5KAT Control Cable
HL-2.5KFX
Band Data Cable
Transceiver
SEND/
ALC STBY ANT
◎ ◎ ◎
◎
230 V AC Cord
ALC Cable
PTT Cable
Coax Jumper Cable
Connector and Cable List
HL-2.5KFX side
Display/
connector name
AC200V
IEC3P Inlet
IEC3P
ALC
RCA-J
SEND
RCA-J
RCA-P
TUNER
DIN7J
DIN7P
IN
UHF(SO239)
OUT
UHF(SO-239)
CONT
D-SUB15R
Signal
Cable side
Connector
To:
①AC200L
②GND
③AC200N
AC230V consent
Transceiver
ALC socket
Transceiver
PTT relay
ALC Output
RCA-P
PTT Input
PL259
PL259
D-SUB15P
Auto Tuner
Description
AC Power Cord
200V 20A
RF output (-) recitification
-10V max.
Short at TX
Open at RX
12V 40mA
Band tracking signal
Tuning Control
②GND
④EVENT
⑦FREQ
HC-1.5KAT
CONT socket
TRX
ANT of Transceiver Coax Cable
Antenna or Tuner
Coax Antenna Cable
Input
Band data terminal See Section 10. for details
of transceiver
Antenna
Band Data
11
7-2
Technical Information
Equivalent Circuit of SEND Terminal
Equivalent Circuit of ALC Output
12
8. Operation
***CAUTION: Under the Manual Band Set operation, always be sure to check if
BAND Switch position matches that of your radio before keying PTT or the CW
paddle. Also when you have changed the BAND, do not make the full power CW
(carrier) drive but reduced level power to see if the BAND is set correctly and the
amplified RF power comes out properly. Full power CW drive under the BAND
Mis-set leads to the failure of the valuable final power FET devices. ***
8-1
Various Status
There are four modes to be displayed on LCD.
① STBY (Standby Mode)
This mode is for AC Power ON, and
OPER. Switch at STBY position.
Amplifier is in a through state.
② OPER (Operate) Mode
This mode is for AC Power ON, and
OPER switch at OPER. Position.
Amplifier will work, if the transceiver is
keyed.
③ ONAIR (On Air) Mode
This is for amplifier being keyed
under OPER. Mode.
Amplifier is amplifying or ready to
amplify the drive signal.
④ PROT (Protection) Mode
Amplifier has been shut down by the
protection circuit and is in a though
state.
See page 19, Section11. Protection
Circuits on how to reset.
13
8-2
8-2-1
How to Operate
Connect AC cord and coax cables as illustrated in Section 7 Connection.
Connect the cable from “
SEND”to ACC or the remote terminals of transceiver,
where it is marked “
SEND”or “
TX GND”
. These terminal pins are shorted to
ground when the transceiver is in TX/ON AIR mode. If these connections are not
made, the amplifier will not go into TX (amplification) mode. For a temporary
check to the amp, ground the SEND center pin by inserting an RCA plug whose
center pin has been soldered to the outer case of the plug with a small piece of
wire. As a side note, this SEND terminal shows 12 VDC when open, and draws
35 mA when shorted.
8-2-2
At first, turn the ALC knob full clockwise to avoid ALC voltage to the
transceiver. Application of ALC will be covered in the following Section 9.
8-2-3
Keeping the POWER (AC mains) switch off, check the SWR of your
antenna by keying the transceiver to TX mode (CW or RTTY mode). Monitor the
SWR with an external SWR/Power meter. If SWR is 1.8 or higher at band center,
the antenna has to be adjusted for lower SWR.. As an alternative, an antenna
tuner may be inserted.
8-2-4
While keeping OPER/STBY switch at STBY position, turn the POWER
switch on. Turn ④BAND AUTO-MAN’
L switch to AUTO, or MAN’
L(manual)
position. If MAN’
L is selected, turn BAND-MAN’
L switch to desired band. See
page 17, Section10. Band Data Cable Connection, for more details of various
band data cables. Turn the STAND-BY switch to OPER (operate) position and
the amplifier is ready to go. If the POWER switch is turned on, while
OPER/STBY switch is at OPER(operate) position, the orange OPER lamp will
blink, and you will need to reset the OPER switch to enter into operation mode.
“
PSE STBY OPERSW is displayed at this time. If you key the transceiver with
the carrier level set relatively low (such as 20-30W), you will achieve an
amplified output signal of a few hundreds watts. Monitor this output with the PF
meter or with an external power meter. Increase drive level to roughly 50W and
see if the antenna SWR stays constant. (As higher RF currents flow some
antennas may show a changed SWR value due to heated connector junctions
and trap coils.)
14
8-2-5
You can now increase the drive level to nearly 80-90W to achieve
maximum carrier output power of 1.4 kW (CW, RTTY) from the amplifier. If you
change to SSB mode, peak voice power will reach approximately 1.5 kW. For
high duty cycle transmissions like RTTY, SSTV, or FM modes, it is
recommended you reduce the drive power by 20-30 % compared with SSB/CW.
8-2-6
With a high power transceiver in SSB mode, you can overdrive the
amplifier resulting in a distorted output signal. This can also occur if you speak
too loud or if you set the microphone gain too high. Speak into the microphone
properly to reduce the possibilities of splattering into the neighborhood. The ALC
is effective in preventing the output signal from being distorted or to limit the
carrier level to within rated output levels. As long as you do not overdrive, you
can disregard the ALC connection. See page 15, Section 9. ALC Connection for
details.
8-7-7
Protection circuits may work during operation depending on the
conditions. If the protection circuit has shut down the amplifier, check the
antenna SWR, Vd, AC line voltage, or try to reduce the drive level. To reset, turn
off the ② OPER/STBY switch once, then back on again. Note that some
protection modes need to reset the ①POWER switch(See page19, Section 11.
Protection & Safety Circuits for more details). The power transformer has an
overheat protection(130℃) in the coil layer. If this temperature switch activates,
the amplifier will put you in receive mode with the cooling fan operating until the
transformer has cooled off. It may take ten to fifteen minutes to cool, depending
upon room temperature. In the same way, there is a built-in thermal switch
(100℃) in the heat sink block of power FET’
s.
9. ALC Connection
ALC voltage is available at the terminal marked ALC (RCA phono jack) on the
right upper corner of the rear panel. Negative maximum DC voltage of ten volts
(-10 V) is produced at this terminal when the amplifier is fully driven. This voltage
is adjustable with the ALC ADJ. knob located above the ALC jack. If the ALC
voltage is properly fed back to the transceiver, you can keep the maximum
output power constant or hold the power at a certain level. Also ALC is useful in
avoiding your SSB signal from being distorted when overdriven. You may not
15
always need to connect ALC to the transceiver, if you set the mic gain properly
and do not overdrive the amplifier. Depending upon the manufacturer of the
transceiver, the suitable ALC voltage differs. ICOM may need 0~-4 V, and Yaesu
may need 0~-5 V range.. Kenwood may need -6~-8 V maximum. Check your
transceiver manual.
9-1
Prepare an ALC control cable using the RCA plug supplied in the
package. Solder a single wire or (more preferably) a shielded single wire to the
center pin of RCA plug and solder the shield braid to the outer side of the plug.
Connect the control cable to the “
ALC (or EXTERNAL ALC)”jack of the
transceiver. External ALC input is sometimes available at one of the pins of the
“
ACC”socket of the transceiver as well.
9-2
At first, turn ALC ADJ. full clockwise. Drive the amplifier in CW/RTTY
mode to full output power. Then turn the ALC ADJ counter-clockwise. Observe
the SWR/Power meter at the output, (or Pf of the multimeter). Stop turning the
ALC ADJ at the point the power starts to decrease. Or if you wish to further
reduce the power, keep turning ALC ADJ until the desired level is achieved. If
you further try to increase the drive power you will now see the output power
become rather saturated, from these adjustments,
(Maximum ALC voltage produced is -10 V when the amplifier output is over 200
W.)

Max Min
to Transceiver
16
10. Band Data Cable Connection
This section explains about the methods of the auto band setting Collaboration
with the modern transceivers of ICOM, Yaesu and Kenwood.
To make this setting, it is needed that the band data cable is connected to
“
CONT” connector as well as selecting “
TRXSEL” for the proper radio
manufacturer.
Turn off AC powers of both the amplifier and the transceiver when you connect
this data cable. Be sure to confirm the auto band set on each band, after you
finish above settings.
Manual Band set
Auto Band set/ CI-V
10-1
①
②
ICOM DC Voltage Band Data
HL-2.5KFX Setting
TRXSEL:
“
I”
LCD:
“
ICOM”
Wiring:
Fig. A
TRX ACC
Transceiver Setting
None
②
Caution:
This method fails to discriminate
24 and 28 MHZ of WARC bands.
17
10
11
12
13
14
15
3.5mm PHONE PLUG
ICM
ICM G
ICOM-REGACY BAND DATA

10-2
①
②
ICOM CI-V
HL-2.5KFX Setting
TRXSEL:
“
C”
LCD:
“
CIV”
Wiring:
Fig. B
TRX ACC
Transceiver Setting
CI-V BAUD RATE:
9600 [bps]
CI-V ADDRESS:
5 Ch
CI-V Transceiver:
ON
CI-V with IC-731:
OFF
10
11
12
13
14
15
ICOM CI-V DATA WIRING
3.5mm PHONE PLUG

(See ICOM radio manual for the details.)
10-3
①
②
Yaesu Band Data
HL-2.5KFX Setting
TRXSEL:
“
Y”
LCD:
“
YSU”
Wiring:
Fig. C
TRX ACC
10
11
12
13
14
15
Transceiver Setting
None
BAND-A
BAND-B
BAND-C
BAND-D
GND
YAESU BAND-DATA

10-4
Kenwood RS-232C
①
HL-2.5KFX Setting
②
TRXSEL:
“
K”
LCD:
“
KEN”
Wiring:
Fig. D
Transceiver Setting
Speed:
9600 [bps]
Stop bit:
1 bit
(See Kenwood radio manual for
the details.)
18

11. Protection & Safety Circuits
11-1
Protection Circuits
HL-2.5KFX is equipped with ten protection circuits as shown in the table below.
Protections are commanded by the 16bit microprocessor chip, and DC drain
voltage (120 V) is cut off, when the protection circuit works. Also PROT lamp is lit
and the amplifier becomes “
through”state.
If PROT lamp is blinking, you may reset the shut down with OPER/STBY
switch. Reason for the shut down is displayed on LCD panel except for some
cases.
←Example of LCD display
(In this case, over drive)
For OVER VDD and OVER TEMP shut downs, turn the AC Power switch off
and on to reset the amplifier.
No. PROTECTION
LCD DISPLAY
Over drive
PROT OVER DRIV
Band mis-set
PROT BAND-MISS
Over current
PROT OVER ID
Freq. Inhibit
PROT INHBT FREQ
Over PF
PROT OVER Pf
Over PR
PROT OVER Pr
Over Dissipation
Over Tj
Over voltage
PROT OVER Plos
PROT OVER Tj
PROT OVER VDD
10 Over heat
PROT OVER TEMP
11 Fuse blown
PROT FUSE-BLOW
CONDITION
RESET
Drive exceeded 120 W
*1
Amp gain is less than five times
*1
ID (drain) exceeded 35 A
*1
Driven freq-ranged 26 to28 MHz
*1
Output power exceeded 1550 W
*1
Reflected power exceeded W
*1
OPER
OPER
Or when amp out of
order
OPER
OPER
FCC rule
OPER
OPER
Drain power dissipation exceeded
2000 W
*1
Theoretical
*1
Theoretical calculation
OPER
Functon temp. reached 190℃
OPER
Drain voltage exceeded 140 V
*2
Heat sink temp reached 90℃
*2
Fuse was blown
(F1, F2 of Unit 10)
REMARKS
AC POWER
AC POWER
Not resettable
Check Fan Control
Unit, Unit 10
*1: Reset OPER/STBY switch.
*2: Reset AC main POWER switch.
19
11-2
Safety Circuits
In addition to the protection circuits above, there are other safety circuits
(inter-locked circuits) built in the amplifier.
They directly shut down AC power line for the primary of the power transformer,
and if shut down, AC power lamp (green), LCD display and cooling fan will all go
off.
In case this shut down has suddenly occurred during the transmission, stop
transmitting first and wait for several minutes. Pull off AC power plug and check
whether or not AC main fuses are blown.

Thermal Switches Threshold
Heat Sink:
100 ℃
Power Transformer: 130 ℃
These shut-downs will automatically be relieved, when the internal heat cools
off. Be sure to turn off AC power switch, before you leave the operation desk.
Otherwise AC power will be turned on for itself right after the cooling.
Cover Switch
AC200V
AC Power Relay
Main Fuse
12V Sub
DC
Power
Heat Sink X-former
Supply
AC200V
100℃
Main Fuse
20
130℃
Relay
Power
X-former
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---

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