Rotel RA 870BX Service Manual
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Page 1
Qunlrly Unromwamvxtd
DTEL
Technical
Manual
Table of Contents
Specifications ...........
Adjustment ............
Parts List .............
Wiring Diagram ..........
Schematic Diagram ........
Specifications
Continuous Power Output
DIN Output ............
Peak Current ...........
(0.1 ohms, 10 usec, 1 pulse)
Total Harmonic Distortion . . .
lntermoduration Distortion . . .
Output: SPEAKERS .......
HEADPHONES
Damping Factor .........
Input Sensitivity/Impedance:
PHONO (MC) .........
PHONO (MM) ........
C04 TUNER .........
AV/AUX 1, 2 .........
TAPE MONlTOR 1, 2 . . ..
........... 3,4
........... 5,6
........... 1
80 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.
150 watts per channel (1 kHz
4 ohms,1% THU)
50 A
No more than 0.03% (continuous
rated power output)
No more than 0.03% (continuous
1/2 rated power output)
No more than 0.05% (1 watt per
channel power output, 8 ohms)
No more than 0.05% (continuous
rated power output)
No more than 0.05% (continuous
1/2 rated power output)
No more than 0.05% (1 watt per
channel power oumut, 8 ohms)
8 ohms nominal
. 4-16 ohms
180 (20 to 20,000 Hz, 8 ohms)
250 uV/180 ohms
2.8 mV/47 kohms
150 mV/24 1(0th
150 mV/24 kohms
150 mV/24 kohms
THE FIOTEL CO., LTD.
HOTEL ELECTRONICS OO., LTD.
1333.2 8.1987,
STEREO INTEGRATED AMPLIFIER
RA-87OBX
Overload Level (T.H.D. 0.5%, 1 kHz):
PHONO (MC) . . 20 mV
PHONO (MM) ........ 180 mV
CD, TUNER, TAPE 1, 2. . . 5V
AV/AUX 1, 2 ......... 5V
Frequency Response:
PHONO ............ 20 to 20,000 Hz, :02 dB
(RIAA STD)
CD, TUNER, TAPE 1, 2 , . . 4 to 100,000 Hz, +1.0 £13, -3.0 dB
AV/AUX 1, 2 ......... 4 to 100,000 Hz, +1.0 dB, 43.0 dB
Signal-to-Noise Rated (lHF, A network):
PHONO (MC) ......... 70 dB
PHONO (MM) ........ 80 dB
CD, TUNER, TAPE 1,2. . t 102 dB
AV/AUX 1, 2 ......... 102 dB
Power Requirement ....... 120V/60 H2, 220V/50 Hz,
240V/50 Hz or 120, 220, 240W
5060 Hz (switchable)
(depending on destinations)
Power Consumption ....... 380 watts
Dimensions (overall) ....... 430(W)x109(H)x 317(0) mrn
16-15/16" x 4-7/32" x 1215/32
Weight (net) ............ 9.8 lug/21.66 lbs.
ISpecifications and design subject to possible modification without
notice.
oMeasured pursuant to the Federal Trade Commission's Trade
Regulation Rule on Power Claims for Amplifiers (applicable to the
USA. only).
Serial No.
Beginning
1736780HOKAYAMA, MEGURO-KU, TOKYO 152, JAPAN
3RD FLOOR, HOTEL BLDG , NO 35 FUSHING, NORTH
ROAD, TAIPEI, TAlWAN, REPUBLlCK OF CHlNA
Page 2
Parts List
53:35:: Computer No. Description 36:32:: Computer No. Description
0601 03225A1016K-FG 0901 034KBP0804 Rectifier
0602 03225A1016K»FG 0902 034KBP0804 Rectifier
0603 03223A1016K-FG 0903 03403135C
0604 03228A1016KAFG 0904 034IS1588
0605 03228A1016K-FG 10401 031NE5534AN
0606 0322SA1016K-FG "2402 031N55534AN
0607 0322301941-KL IC403 031N55534N
0603 0322801941»KL IC404 031N55534N
0609 032283605-KL I0501 031 NE5532AN
0610 032253605-KL l0502 031NE5532AN
0611 032285631K-EF VR601 051SF637A-2K Bias Adit
0612 032283631K-EF VR602 051SF687A-2K Bias Adir
0613 032280600K
0615 033280600K-EF Driver VR503 0510-4109 Level Volume
0616 033250600KAEF Driver VR504 051 C«4170A10 CD Direct Level Volume
0617 033283631K- E F Driver TH601 034TD5C3500 Temperature Compensator
0618 033283631K-E F Driver 5401 0644TR-2294 Phono Selector
0619 03328 D1047-DE Power Driver 8501 062C-4174A07 Tone Selector
0620 0332501047-05 Power Driver 8502 064CA175A52 Function
0621 033280104705 Power Driver 8503 0640-4175A52 Monitor
0622 0332801047-0E Power Driver 5504 062C-4174A04 CD Direct Selector
0623 0332301047-DE Power Driver 3505 061CA172A08 Speaker Selector
0624 0332801047»DE Power Driver RY-651 0630RZvSS224L Relav
0625 033288317-DE Power Driver
0626 033253817-DE Power Driver 0001 0440E7150F472M Spark Killer
0627 033233317«DE Power Driver 8001 061C4176A02 Power Switch
0628 033283817-0E Power Driver T001 022T-1015001 Power Transformer
0629 0332sBS17-0E Power Driver
0630 033283817«DE Power Driver 011TFP-451 Front Panel
0550 032280536-FG 0124TR-2176 Knob (Power)
0551 032280536-FG 0124TR-2356#2 Knob (Function)
0571 032280600K-E F 0124TR-2373 Knob (Volume L)
0572 032280600K-EF 0124TR-2374 Knob (Volume R)
0573 03228B631K»EF 0120-3137#5-T Knob (Bass, Treble, Tone
0574 032283631K-EF Selector, CD Direct Selector,
0651 0322802362K-FG CD Direct Level, Monitor)
0120-3982#2 Knob (Speaker Remote)
0571 034RD18EB Zener 0143TR-2349 Ornamental Side Plate
D572 034R D18EB Zener 0143TUV-6#1 Upper Cover
0601 034|S1588 017C-4322A01 Heat Sink
0602 034151588 017C-4323A00 Sub Heat Sink
0603 034IS1588
0604 034151588 062C4175A08 Rotary Switch (Function,
0605 034DS135C Monitor)
0606 034081350 0674TR-2267#1 Speaker Terminal
0607 034081350 0690-4304A01 Voltage Selector
0608 034DS135C 0690-4320A01 Connector
0651 034181588
Adjustment
Power Amplifier Bias Adjustment
Instruments : DC mini-voltmeter
Notes 2 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 Coupling Locaton Adu t Ad'u tf
p Plus Lead Minus Lead I l s l s or
1 TP1 TP3 X-1085 PCB VR601 . .
2 TP4 TP2 X-1085 PCB VR602 DC milll»vo|trneter reads 5 mV
_2-