Rotel RB 870BX Service Manual

Page 1

Qualrly Unrbmpromvud

Technical
Manual

Table of Contents

Specifications ..................... 1
Adjustment ................... 2
Parts List ........... 2
Wiring Diagram . . . . ..... 3, 4
Schematic Diagram .................. 5, 6

Specifications

100 watts' per channel, min.
RMS both channels driven into
8 ohms from 20 to 20,000 Hz
with no more than 0.03% total
harmonic distortion.

200 watts per channel (1 kHz,
4 ohms, 1% THD)

50 A

Continuous Power Output

DIN Power Output ,,,,,,,,

Peak Current
(0.1 ohms, 10 usec, 1 pulse),
Bridged Power

300 watts (mono) min. RMS
driven into 8 ohms from 20 to
20,000 Hz with no more than
0.05% total harmonic distortion.
No more than 0.03% (continuous
rated power output)

No more than 0.03% (continuous
1/2 rated power output)

No more than 0.03% (1 watts per
channel power output, 8 ohms)
No more than 0.03% (continuous
rated power output)

No more than 0.03% (continuous
1/2 rated power output)

No more than 0.03% (1 watt per
channel power output, 8 ohms)

Total Harmonic Distortion
(20 to 20,000 Hz)

lntermoduration Distortion . . .
(60Hz:7kHz:4 : 1)

THE FIOTEL CO., LTD.
HOTEL ELECTRONICS CO., LTD.

STEREO POWER AMPLIFIER

RB-87OBX

Output ............... Speaker 8 ohms nominal
Damping Factor ......... 180 (20 0 20,000 Hz, 8 ohms)
Input Sensitivity/Impedance. . . 1,0V/ ohms
Frequency Response ....... 4 to 100,000 HZ, +0.5 dB,
-3,0 dB
Signal-to-Noise Ratio
(IHFAnetwork) ....... 110dB

120V/60 Hz, 220V/50 Hz,
240V/50 Hz or 120, 220, 240V/
50-50 Hz (switchable)
(depending on destinations)

Power Requirement

Power Consumption ....... 500 watts

Dimensions (overall) ....... 430(W)x109(H)x 315(D) mm
16-15/16 x 4-7/32"x12-13/32"

Weight (net) ............ 9.4 kg/20.68 lbs.

OSpeciIications and design subject to possible modification without
notice.

O'Measured pursuant to the Federal Trade Commission's Trade
Regulation Rule on Power Claims for Amplifiers (applicable to the
U.S.A. only).

Serial No.
Beginning

l 36 8 OHOKAYAMA, MEGLJROVKU, TOKYO 152, JAPAN
3RD FLOOR ROTEL BLDG , N0 35 FUSHING, NORTH
ROAD TAIPEI, TAIWAN, REPUBLICK OF CHINA

Page 2

Parts List

Seherri Itic

Schematlc

Location Computer No. Description Location Computer No. Dncription
0601 O3225A1016-FG D607 034DS135C
0.602 03225A1016-FG 0901 031051588
0603 0322SA1016-FG TH601 034T05C3500 Temperature Compensator
0604 03225C1941-KL VR601 051SF687A-2K Bias Adj.
0605 03ZZSBGOS-KL RY901 0630RZ-SS224L Relay
0506 032258631K-EF $901 064C4173A05
0507 032280600K-E Idling Driver C001 044DE7150F472M Spark Killer
0608 03328 0600K-EF Driver 3001 061 C41 76A02 Power Switch
0609 033283631K-EF Driver T001 022T-1016601 Power Transformer
0610 0332501047-DE Power Driver 0001 034SEL1124R Power Indicator
0611 0332501047-DE Power Driver
0612 0332501047-05 Power Driver 011PF4-13A00 Front Panel
0613 033238817'DE Power Driver 0124TFI-2176 Knob (Power)
0614 033288817~DE Power Driver 0143TR»2349 Ornamental Side Plate
0615 033258817-DE Power Driver 0143TUV-6#4 Upper Cover
0901 0322SC2362-FG 017C4322A01 Head Sink
D601 034181588 017C-4323A00 Sub Heat Sink
0602 034151588 066C4225A04 2? Pin Jack (Input)
0603 034DS135C 0673TR-2045#3 Output Terminal (Red)
0604 034DS135C 0673TFl-2045M Output Terminal (Black)
0605 034KBPC804 . Rectifier 069C4304A01 Voltage Selector
0606 034181588
Adjustment

Power Amplifier Bias Adjustment

Instruments : DC milli-voltmeter
Notes : Prior to Bias Adjustment, run about 5 minutes with rated output (8 ohms) and
warm up Power Transistor and Heat Sink. Set input off.
Ste C°p""9 Loc tion Ad'u t Ad' t fo
p Plus Lead Minus Lead a J 5 JUS r
1 TP2 TP1 E-1090 PCB (Lch) VR601 . .
2 TP2 TP1 E-1090 PCB (Rch) VR601 DC milli-voltmeter reads 5 mV