Rotel RKB-250 User manual

Technical
Manual
STEREO POWER AMPLIFIER
RKB-250
Table of Contents
Specification
Specification.....................................1
Parts List..........................................2~5
Assembled View...............................7~8
Adjustment.......................................6
PCB Assembly.................................9
Schematic Diagram..........................10
BUNZAN-SHINSEN-BLD. 4F 10-10 SHINSEN-CHO, SHIBUYA-KU,
TOKYO 150-0045, JAPAN
Serial. NO.
®
Quality Uncompromised
Y-381A-0505/pdf
Continuous Power Output into 8 ohms
(20-20kHz, < 0.03% THD)2
50 watts/ch into 8 ohms, all channel driven
Continuous Power Output into 4 ohms
(DIN 1 kHz,1.0% THD)D
90 watts/ch into 4 ohms, all channels driven
Total Harmonic Distortiono
(20Hz-20kHz, 8 ohms)2
Continuous rated power. <0.03%
One-half rated power. <0.03%
1 watt power. <0.03%
Intermodulation Distortion
(60 Hz : 7 kHz, 4:1)
< 0.03%
Danping Factor
(20-20,000 Hz, 8 ohms)
>200
Input Impedance
20 k Ohms
Input Sensitivity
1.0 volt
Amplifier Gain:
26 dB
Input Overload Level
5.0 volt
Peak Current
> 25 A
Frequency Response (±1 dB)
10Hz-100kHz
S/N Ratio (IHF A)
115 dB
Crosstalk/Separation
> 70 dB
Speaker Impedance
4 ohms minimum
Auto Turn On Level (with all inputs)
3 mV input signal
Power Requirements
USA: 120 Volts, 60 Hz
Europe: 230 Volts, 50 Hz
Power Consumption
190 Watts
Idle: 22 Wattsd
Standby: 2.3 Watts
Dimensions (W x H x D)
(not including rack adaptors)n
430 x 100 x 322 mm
16.9 x 3.9 x 12.7 in
Weight (net)
8 kg, 17.6 lb.
Panel Height
2U, 88.1 mm/3.5 in

AC BREAKER
SPEAKERS
RIGHT LEFT
INPUT
RIGHT LEFT
SIGNAL OUTPUT
LINK
RIGHT
12V TRIG OFF
SIGNAL SENSE
LEFT
IN
OUT
PO WER AMPL IFI ER
MOD EL NO. RKB-2 5 0
PO WER C ONSUMPTION: 1 9 0 W
W ARNI N G : SHOC K HAZARD — DO NO T OPEN .
A V IS: RISQUE DE C HOC É LECTRI QUE — N E P AS OUVRI R.
4 O H M S M IN IM U M
WARNING: TO REDUC E THE R ISK OF FIRE OR ELECTRICAL
SHO CK, DO N OT EX POS E THIS EQU IPMEN T TO R AIN OR M OISTU RE
PRO TECTION
LEVEL
POWER AMPLIFIER RKB-250
RL
POW ER
Appearance RKB-250
10A
FAN Guard
Label
FAN Motor
Connector Plug
Socket
4x Screws
Installation of FAN KIT for RKB Amplifiers
Installation of FAN KIT for RKB AmplifiersInstallation of FAN KIT for RKB Amplifiers
Installation of FAN KIT for RKB Amplifiers
1. Locate and remove the metal plate on the rear panel using
a Philips head screw driver.
2. Insert the four long screws supplied with the fan kit through the
Fan guard and into the fan. Notice the arrow on the top of fan
should point away from the rear panel and that the label on the
fan should be visible through the fan guard. Air is drawn through
the amplifier by the fan and expelled out through the fan guard.
3. Insert the plug attached to the fan into the socket marked
"OPTION RKBF-1 ONLY" the plug will only fit one-way.
4. Now tighten the four Philips head screws holding the fan and the
unit is complete. The fan will only run when the inside temperature
of the amplifier reaches 70C, it will not run all the time.
2

Parts List 1/3 RKB-250
SYMBOL PARTS NO. DESCRIPTION
501 X-1426 PCB ASS'Y (MAIN)
L601,602 021 TRL-332 SPEAKER COIL 1F 23T
IC601,602 031 MPC1237HA IC (PROTECTION)
IC401,402 031 NJM4558DD IC (OPE DUAL)
IC701 031 NJM555D IC (TIMER)
IC751 031 PC817X2 IC (PHOTO COUPLER)
Q609,610 032 B631-EF TRANSISTOR 2SB631K-EF
Q601-608 032 TA1016-FG TRANSISTOR 2SA1016KAA-FG
Q633-636,751,753 032 TA608-FG TRANSISTOR 2SA608KAA-FG
Q611,612 032 TC1941-KL TRANSISTOR 2SC1941-T-KL
Q629-632,701-705,752 032 TC536-FG TRANSISTOR 2SC536KAA-FG
Q952 033 TA1016-FG TRANSISTOR 2SA1016KAA-FG
Q951 033 TC2362-FG TRANSISTOR 2SC2362KAA-FG
D911,912 034 RS403L POWER DIODE 4A200V
D609,610,705,706,971,972 034 T1N4004-TB DIODE 1N4004-F
D601-608,704,701,702,751,752 034 T1N4148-86 DIODE 1N4148TAP-50
D951,952 034 TRD18JST1 ZENER DIODE 18V
D621,622 034 TRD5.6JST1 ZENER DIODE 5.6V
TH601,602 034 TTC-503 THERMISTOR 50K
D901 034 W02M POWER DIODE 1.5A200V
F901,902 036 5ST6.3 FUSE 250VT6.3A
C909-912 041 50USP682 ELECTROLYTIC CAPACITOR 50V6800uF
C401-404,605,606,619,620,708 041 TUTES1E101-7TF ELECTROLYTIC CAPACITOR 25V100uF
C621,622 041 TUTES1E470-7TF ELECTROLYTIC CAPACITOR 25V47uF
C705 041 TUTES1E471-7TS ELECTROLYTIC CAPACITOR 25V470uF
C617,618,623,624,703 041 TUTES1H100-7TF ELECTROLYTIC CAPACITOR 50V10uF
C970 041 TUTES1H101-7TF ELECTROLYTIC CAPACITOR 50V100uF
C751 041 TUTES1H2R2-7TF ELECTROLYTIC CAPACITOR 50V2.2uF
C919,920 041 TUTES1H471-7TS ELECTROLYTIC CAPACITOR 50V470uF
C913,914 041 TUTES1H4R7-7TF ELECTROLYTIC CAPACITOR 50V4.7uF
C707,971 041 TUTES1J221-7TS ELECTROLYTIC CAPACITOR 63V220uF
C951,952 041 TUTES1V221-7TF ELECTROLYTIC CAPACITOR 35V220uF
C706 042 TP50V103JE MYLAR CAPACITOR 0.01uF
C710 042 TP50V183JE MYLAR CAPACITOR 0.018uF
C901-908,915-918 043 TC500V103 CERAMIC CAPACITOR 500V0.01uF
C611,612 043 TC50V103 CERAMIC CAPACITOR 0.01uF
C609,610 043 TC50V151 CERAMIC CAPACITOR 150pF
C603,604 043 TC50V221 CERAMIC CAPACITOR 220pF
C601,602,607,608 043 TC50V331 CERAMIC CAPACITOR 330pF
C625 043 TC50V473 CERAMIC CAPACITOR 0.047uF
C613,614,701,704 044 50MSAN104JE SF CAPACITOR 0.1uF
C001 044 DE1307E472M SPARK KILLER 4700pF
VR001,002 051 C-4170A38 VARIABLE RESISTOR 50KB
VR603,604 051 SFR002-222 S.F.RES VM6CKPV1S-2.2K
R901,902 054 1WS1.5KJF MOF RESISTOR 1W 1.5K
R653,654 054 1WS10JF MOF RESISTOR 1W 10
R714 054 1WS1KJF MOF RESISTOR 1W 1K
R713 054 1WS3.3KJF MOF RESISTOR 1W 3.3K
R645-652 054 2WS0.22JF MOF RESISTOR 2W 0.22
R972 054 3WS390JF MOF RESISTOR 3W 390
R971 054 ERQ12AJ2R2P FUSIBLE RESISTOR 1/2W 2.2
R405,406,623,624,627,628 054 TMF1000 METAL FILM RESISTOR 1/4W 100
R601,602,661,662 054 TMF1001 METAL FILM RESISTOR 1/4W 1K
R403,404,619,620 054 TMF1002 METAL FILM RESISTOR 1/4W 10K
R637,638,685,686,689,690 054 TMF1003 METAL FILM RESISTOR 1/4W 100K
R675,676 054 TMF1201 METAL FILM RESISTOR 1/4W 1.2K
R715 054 TMF1202 METAL FILM RESISTOR 1/4W 12K
R687,688 054 TMF1203 METAL FILM RESISTOR 1/4W 120K
R605,606 054 TMF1500 METAL FILM RESISTOR 1/4W 150
R609,610 054 TMF1501 METAL FILM RESISTOR 1/4W 1.5K
016 X-1426A01-04 PCB ASSY
3

Parts List 2/3 RKB-250
SYMBOL PARTS NO. DESCRIPTION
R617,618,663-666,673,674 054 TMF1502 METAL FILM RESISTOR 1/4W 15K
R641-644 054 TMF2200 METAL FILM RESISTOR 1/4W 220
R631,632 054 TMF2201 METAL FILM RESISTOR 1/4W 2.2K
R671,672 054 TMF2202 METAL FILM RESISTOR 1/4W 22K
R953,954 054 TMF2701 METAL FILM RESISTOR 1/4W 2.7K
R667,668 054 TMF3300 METAL FILM RESISTOR 1/4W 330
R633,634,681,682 054 TMF3302 METAL FILM RESISTOR 1/4W 33K
R607,608,625,626 054 TMF4700 METAL FILM RESISTOR 1/4W 470
R677,678 054 TMF4701 METAL FILM RESISTOR 1/4W 4.7K
R603,604,683,684 054 TMF4702 METAL FILM RESISTOR 1/4W 47K
R695,696 054 TMF4703 METAL FILM RESISTOR 1/4W 470K
R621,622,692 054 TMF47R0 METAL FILM RESISTOR 1/4W 47
R657,658 054 TMF5602 METAL FILM RESISTOR 1/4W 56K
R611,612,629,630,639,640 054 TMF6801 METAL FILM RESISTOR 1/4W 6.8K
R613,614 054 TMF7500 METAL FILM RESISTOR 1/4W 750
R669,670,679,680 054 TMF8200 METAL FILM RESISTOR 1/4W 820
R706 054 TMF16-1000 METAL FILM RESISTOR 1/6W 100
R752,756 054 TMF16-1001 METAL FILM RESISTOR 1/6W 1K
R705,751,753 054 TMF16-1002 METAL FILM RESISTOR 1/6W 10K
R701,708,709,755 054 TMF16-1003 METAL FILM RESISTOR 1/6W 100K
R401,402,407,710 054 TMF16-1004 METAL FILM RESISTOR 1/6W 1M
R704 054 TMF16-1203 METAL FILM RESISTOR 1/6W 120K
R716 054 TMF16-2202 METAL FILM RESISTOR 1/6W 22K
R703,757 054 TMF16-2203 METAL FILM RESISTOR 1/6W 220K
R707,711,754 054 TMF16-4702 METAL FILM RESISTOR 1/6W 47K
R712 054 TMF16-5603 METAL FILM RESISTOR 1/6W 560K
S001 061 C-4176A08 POWER SWITCH PS3-22SPA-P7AZ TV-8 (PCB)
RY601,602 063 DG2SU-24 RELAY DG24D2-OS(M)
RY701 063 DH2U-24 RELAY DH24D2-O(M)
S701 064 C-4660A00 SLIDE SWITCH SS010-P823
HJ751,752 065 YKB21-5103A 3.5ΦMINIATURE JACK (ST)
PJ1,PJ2 066 4TR-2709#3 2P PIN JACK (WHT/RED)
SP1 067 C-4876A01 4P SPEAKER TERMINAL (RED/BLK)
JP1 068 B2B-EH CONNECTOR WAFER 2P
JP1B,JP2B,JP5B 068 B3B-EH CONNECTOR WAFER 3P
JP4B 068 B4B-EH CONNECTOR WAFER 4P
TP1,TP2 068 C-3681#1 PCB TERMINAL 2P P5.0 TP WD-01 I-502NA
K702,904,CON8 068 C-3683#1 PCB TERMINAL 2P P7.5 TP WE-11 I-752NA
K903,905 068 C-3683#2 PCB TERMINAL 3P P7.5 TP WE-12 I-753NA
K701,901,902 068 C-3683#3 PCB TERMINAL 4P P7.5 TP WE-13 I-754NA
501 E-1434 PCB ASS'Y (CONNECTION)
JP3 068 B2B-XH-A CONNECTOR WAFER 2P
501 X-1426 PCB ASS'Y
017 VF3-05A00 HEAT SINKER BOARD
019 TO-126 MICA SHEET TBM-51W-15 #9524
019 TO-3P MICA SHEET TBM-51W-15 #9043
Q617,618 033 B631-EF TRANSISTOR 2SB631K-EF
Q623,624,625,626 033 B817P-DE TRANSISTOR 2SB817P-DE
Q619,620,621,622 033 D1047P-DE TRANSISTOR 2SD1047P-DE
Q613,614,615,616 033 D600-EF TRANSISTOR 2SD600K-EF
TH02 063 OP62-70-1 THERMAL SENSOR 70C 150L
TH01 063 OP62-70-3 THERMAL SENSOR 70C 350L
011 FP-581-B BLACK PANEL ASSY
012 RV4-09A00 PUSH BUTTON 14Φ(BLACK)
012 VF4-10C00 KNOB 10Φ(BLACK)
014 VF3-06A00 UPPER COVER
019 4TR-2823#2 PLASTIC FOOT 24Φ(ABS)
016 E-1434A00 PCB ASSY
O T H E R S
HEAT SINK ASSEMBLY
4

Parts List 3/3 RKB-250
SYMBOL PARTS NO. DESCRIPTION
019 4TSH-19#2 PLASTIC FOOT 50Φ(BLACK)
019 C-4714A00 POWER KNOB RING 14Φ(BLACK)
019 VF4-19A00 HOLE RUBBER PLUG for RACK FRAME
019 VF4-20A00 HOLE RUBBER PLUG for FRONT PANEL
022 T-1051U02 POWER TRANSFORMER
034 LTL1214A LED 2F (RED)
034 SEL1E24W LED 1X5 (BLU)
069 C-4629A01 AC 2P INLET 6102.3100 (WIRING)
072 C-4621A03 AC CORD SET SJT AWG16 UL 2P for USA
072 C-4622A02 AC CORD SET for AUSTRALIA
072 C-4624A03 AC CORD SET for EUROPE
081 VF3-13A00 INSIDE CARTON
081 VF3-14A00 SHIPPING CARTON
081 Z-212 ETHAFORM
082 OMRKB-250 OWNER'S MANUAL
092 RKB RACK 2U RACK FRAME
092 RKBF-1 OPTION FAN KIT
5

Instruments : DC milli–voltmeter
Notes : Prior to Bias Adjustment, run about 5minutes with rated output(8ohms) and
warm up Power Transistor and Heat Sink. Set input off.
Adjustment
Step
TP1
TP2
X-1426-01 PCB VR603
VR604X-1426-01 PCB
1
2
Coupling Location Adjust forAdjust
DC milli–voltmeter reads 4mV
RKB-250
Case Outlines
2SA608K
2SA1016K
2SA1376A
2SC536K
2SC2362K
2SC3478A 2SB631K
2SD1953
2SD600K 2SA1837
2SC4793
2SB817
2SD1047
PC817B NJM555D MPC1237HA
6

019 C-3759#2
CORD CLAMPER 130N(3F 50MM)
071 BTV3X8BK
JP5B
016 X-1426-01
1 E1 2
1
E1
2
K905 CON8
1 2
JP1
JP6A
K701
2 3 41
D707
E1 E2
K904
12
K702
1 3 4 2
134
2
K901 K902
TH601
TP1
JP5A
VR603
JP3A
JP4A
K903
VR604
JP1B JP2B JP3B
JP6B
TP2
TH602
AC 120V TYPE
501 X-1426-03
JP1A JP2A
JP4B
AC Secondary
AC Primary
Wiring for THERMO SENSOR
To Lch To Rch
CON8
2 1
Assembled view RKB-250
6
7

<Memo>
8

016 X-1426A01 - 04
016 E-1434A00
PCB Assembly RKB-250
9

Schematic Diagram RKB-250
10