Rotel RB-991 User manual

Technical
Manual
STEREO POWER AMPLIFIER
RB-991
Table of Contents
Specification
Specification.....................................1
Wiring Diagram ................................2
Parts List ..........................................3,4
Adjustment.......................................4
PCB Assembly .................................5,6
Schematic Diagram..........................7,8
Continuous Power Output (20-20 kHz, ≤0.03%, 8 ohms) 200 watts/ch.
(20-20 kHz, ≤0.05%, 4 ohms) 300 watts/ch.
Total Harmonic Distortion (20 Hz-20 kHz, 8 ohms) ≤0.03%
Intermodulation Distortion (60 Hz: 7 kHz, 4:1) ≤0.03%
Frequency Response ≥10-100,000 Hz, ±1 dB
Damping Factor (20-20,000 Hz, 8 ohms) ≥500
Speaker Impedance 4-16 ohms
Signal to Noise Ratio (IHF A network) 120 dB
Input Impedance/Sensitivity (RCA Inputs) 33 k Ohms/1.0 volt
(XLR Inputs) 33k Ohms/1.0 volt
Power Requirements 115 Volts, 60 Hz or
230 Volts, 50 Hz
Power Consumption 550 Watts
Dimensions (W, H, D) 440 x 127 x 385 mm
17.38 x 4.76 x 15.16”
Weight (net) 16.7 kg., 36.74 lb.
BUNZAN-SHINSEN-BLD. 4F 10-10 SHINSEN-CHO, SHIBUYA-KU,
TOKYO 150-0045, JAPAN
Serial. NO.
Begining
Wiring Diagram
®
Quality Uncompromised
Y-310A-98061M/S-S
2

SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION
Parts List
SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION
Parts List
43
E
E
E
C
C
C
B
B
B
1234
5
6
7
8
2SAS1016K
2SC2362K
2SC2910
2SA1208
2SB631K
2SD600K
2SD1953
2SA1142
2SC2682
AD711JN
2SA1492
2SC3856
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.
Step Coupling
Plus Lead
TP 3
TP 4
TP 1
TP 2
X-1177-01 PCB
X-1177-02 PCB
VR601
VR602
1
2
Minus Lead Location Adjust Adjust for
DC milli–voltmeter reads 7mV
Adjustment
X-1177-01,02 PCB ASSEMBLY
C601,602 041 50BGF4R7M CAP,ELEC.50V4.7UF
C603,604 044 TFKP2-100V681H CAP,FILM 100V680PF
C607,608 041 25BGF100M CAP,ELEC.25V100UF
C609,610 044 LFSC160V331H CAP,STYROL 160V330PF
C611,612 041 50BGF10M CAP,ELEC.50V10UF
C613-616 044 LFSC160V561H CAP,STYROL 160V560PF
C623-626 041 UVX2A102MRAY CAP,ELEC.100V1000UF
C627,628 044 LFSC160V471H CAP,STYROL 160V470PF
D601-608 034 LT1N4148-86 DIODE
D609-612 034 LT1N4003-TB DIODE
FU601-604 036 5ST6.3 MINI FUSE 250V6.3A
Q601-606 033 LT2SC2362KAA-FG TRANSISTOR
Q607-612 033 LT2SA1016KAA-FG TRANSISTOR
Q613,614 033 2SA1142-EPQ TRANSISTOR
Q615,616 033 2SC2682-EPQ TRANSISTOR
Q619,620 033 LT2SC2910AE-RST TRANSISTOR
Q621,622 033 LT2SA1208AE-RST TRANSISTOR
R601,602 054 LEE10-102 R,METAL 1K
R603,604 054 LEE10-333 R,METAL 33K
R605,606 054 LEE10-471 R,METAL 470R
R607-610 054 LTMK201K5FECZ R,METAL 1% 1.5K
R611,612 054 LTMK2220RFECZ R,METAL 1% 220R
R613,614 054 LTMF1/4-5600F R,MRS25 560R
R615-618 054 LTMK201K5FECZ R,METAL 1% 1.5K
R619,620 054 LTMK2220RFECZ R,METAL 1% 220R
R621,622 054 LTMK2047KFECZ R,METAL 1% 47K
R623,624 054 LTMK2100RFECZ R,METAL 1% 100R
R625,626 054 LTMF1/4-6801F R,MRS25 6.8K
R627,628 054 LTMF1/4-3901F R,MRS25 3.9K
R629,630 054 LTMK2100RFECZ R,METAL 1% 100R
R631,632 054 LTMK2001KFECZ R,METAL 1% 1K
R633,634 054 LTMK2047RFECZ R,METAL 1% 47R
R635-654 054 MPC78-0.22F R,PLATE 2W 0.22R
R657,658 054 LTMK2022KFECZ R,METAL 1% 22K
R659-662 054 2WS6.8KJF R,METAL 2W 6.8K
R663,664 054 LTMK2010RFECZ R,METAL 1% 10R
R665,666 054 LTMF3300 R,METAL 330R
R667-670 054 LTMK2220RFECZ R,METAL 1% 220R
TH601,602 034 TTC-503 THERMISTOR
VR601,602 051 LVM6CKPH1S2.2K SEMI-FIXED RESISTOR
017 C-4378A01 HEAT SINKER
019 TO-126 INSULATION SHEET
066 L4TR-2487#7 1P PINJACK(RED)
066 L4TR-2487#8 1P PINJACK(WHT)
068 L4TR-2787#3 CONNECTOR BASE
068 LC-4349A04 3P CONNECTOR WIRE
069 C-3417A FUSE CLIP
069 C-4446A00 SCREW TERMINAL
X-1237-01 PCB ASSEMBLY
C001 044 DE7150F472M SPARK KILLER
S001 061 C-4176A07 POWER SWITCH
X-1237-02 PCB ASSEMBLY
069 C-4370A00 SCREW TERMINAL
X-1237-03 PCB ASSEMBLY
C801 041 GS100V220-B CAP,ELEC.100V22UF
C802 041 GS25V101-B CAP,ELEC.25V100UF
C803 041 GS100V221-D CAP,ELEC.100V220UF
C804 041 GS100V220-B CAP,ELEC.100V22UF
D801 034 LT1N4148-86 DIODE
D802 034 RD10EB ZENER DIODE
D803-806 034 LT1N4003-TB DIODE
D807,808 034 LT1N4148-86 DIODE
Q801-803 032 LT2SC2362KAA-FG TRANSISTOR
R801 054 1WS5.6KJF R,METAL 1W 5.6K
R803 053 CR14-104J-A R,CARBON 100K
R804 053 CR14-224J-A R,CARBON 220K
R805 053 CR14-104J-A R,CARBON 100K
R806 053 CR14-333J-A R,CARBON 33K
R807 053 CR14-104J-A R,CARBON 100K
R809,810 054 1WS6.8KJF R,METAL 1W 6.8K
R811,812 053 CR14-104J-A R,CARBON 100K
R813,814 053 CR14-183J-A R,CARBON 18K
R815,816 053 CR14-332J-A R,CARBON 3.3K
R817,818 053 CR14-273J-A R,CARBON 27K
068 L4TR-2787#3 CONNECTOR BASE
X-1237-04 PCB ASSEMBLY
C901.902 041 25BGF470M CAP,ELEC.25V470UF
D901,902 054 RD16EB ZENER DIODE
Q901 033 L2SD600K-EF TRANSISTOR
Q902 033 L2SB631K-EF TRANSISTOR
R901,902 054 1WS2.2KJF R,METAL 1W 2.2K
R903,904 054 1WS5.6KJF R,METAL 1W 5.6K
RY901 063 EG2-24NU RELAY
S901 064 4TR-2341 SLIDE SWITCH
017 C-4401A01 HEAT SINKER
019 TO-126 INSULATION SHEET
X-1237-05,06 PCB ASSEMBLY
C501,502 044 LS50V100PJ CAP,STYROL 50V100PF
C505-508 041 25BGF100M CAP,ELEC.25V100UF
IC501,502 031 AD711JN IC
R501-504 054 LTMK2022KFECZ R,METAL 1% 22K
R505-508 054 LTMK2010KFECZ R,METAL 1% 10K
R509,510 054 LTMK2001KFECZ R,METAL 1% 1K
066 C-4575A01 CANNON CONNECTOR
068 L4TR-2787#5 CONNECTOR BASE
HEAT SINKER ASSEMBLY
Q617,618 032 L2SD1953 TRANSISTOR
Q623-632 033 2SA1492-OPY POWER TRANSISTOR
Q633,634 033 L2SB817-DE DRIVER TRANSISTOR
Q635,636 033 L2SD1047-DE DRIVER TRANSISTOR
Q637-646 033 2SC3856-OPY POWER TRANSISTOR
017 LPX4-06A00 HEAT SINKER
019 TO-3P INSULATION SHEET
OTHERS
011 FP-472 SUB PANEL ASSY
011 RV4-02A02 H/S FRONT PANEL
012 RV4-09A00 PUSH KNOB 14F
014 RV3-07A00 UPPER COVER
015 RP-341 REAR CHASSIS
019 L4TSH-19#2 PLASTIC FOOT
022 T-1037W02 POWER TRANSFORMER
034 LBR154 POWER DIODE
036 3AG125V12A LONG FUSE for STD
036 5ST6.3 MINI FUSE for CEE
041 ALS20S1024XX CAP,ELEC.80V15000UF
044 MKT18-100V104K CAP,FILM 100V0.1UF
054 2WS10JF R,METAL 2W 10R
067 L4TR-2744#1 SPEAKER TERMINAL(RED)
067 L4TR-2744#2 SPEAKER TERMINAL(BLK)
069 C-1575 MINI MFUSE HOLDER
069 C-4200A01 LONG FUSE HOLDER
071 LEL4 EGG LUG
072 L4TR-670#5 AC CORD for STD
072 LC-3763 AC CORD for AUSTRALIA
072 C-4572A01 AC CORD for UK
072 C-4573A01 AC CORD for CEE
081 RV4-15A00 INSIDE CARTON
081 Z-200 STYROL SIDE MOULDING

PCB Assembly
5 6

Schematic Diagram
7 8