Rotel RB-976 MkII User manual

Technical
Manual
SIX CHANNEL POWER AMPLIFIER
RB-976 MK @
Table of Contents
Specification
Specification......................................1
Parts List ...........................................2~3
Adjustment........................................ 4
Service Note......................................4
Case Outlines....................................5
PCB Assembly ..................................5~10
Schematic Diagram ..........................11~12
Continuous Power Output Stereo Mode 60 watts/ch into 8 ohms
(20-20 kHz, <0.03%THD)
Continuous Power Output Bridged Mono Mode 150 watts/ch into 8 ohms
(20-20 kHz, < 0.1% THD)
Total Harmonic Distortion <0.03%
(20Hz-20kHz, 8 ohms)
Intermodulation Distortion <0.03%
(60 Hz : 7 kHz, 4:1)
Frequency Response (±1 dB) 15 Hz-100 kHz
Damping Factor (20-20,000 Hz, 8 ohms) 150
Speaker Impedance (combined load) Stereo mode : 4 ohms minimum
Bridged Mono mode : 8 ohms minimum
Signal to Noise Ratio (IHF A network) 116 dB
Input Impedance 22 k Ohms
Input Sensitivity 1.5 volt
Auto Turn On Threshold Level (if activated) 10 mV input signal
Auto Turn Off Delay Time (if activated) 5 minutes with no signal
Power Requirements USA : 115 Volts, 60 Hz
Europe : 230 Volts, 50Hz
Power Consumption 700 Watts
Dimensions (W x H x D) 440 x 121 x 410 mm
173/8 x 43/4 x 161/8 in
Weight 12.7kg, 28 lb
SHINSEN-BLD. 4F 10-10 SHINSEN-CHO, SHIBUYA-KU,
TOKYO 150-0045, JAPAN
Serial. NO.
Beginning
®
Quality Uncompromised
Y-332A-00115C/S-S

2
Parts List-1
C501.502
C503.504
C505.506
C507.508
C511.512
C513.514
C515-518
C519.520
C551
D501-504
D551.552
R501.502
R503.504
R505.506
R507.508
R509.510
R511.512
R513.514
R515.516
R517.518
R519.520
R521.522
R523.524
R525.526
R527.528
R529-532
R533-536
R537.538
R539
R551.552
R553.554
R555.556
R557.558
R559
R560
R561
R562
R563
R564
R565
T501-506
T507.508
T509.510
T511-514
T515.516
T551.552
T553.554
601-.701-
C401
C407-412
C421
C422
C423
X-1280 PCB ASSEMBLY
041 UTES1H100-FB
044 S50V330PJ
044 S50V220PJ
041 UTES1E101-FB
041 UTES1H010-FB
044 S50V390PJ
044 S50V150PJ
041 UTES1H100-FB
041 UTES1H100-FB
034 T1N4148-86
034 T1N4148-86
054 TMF1001
054 TMF2702
054 TMF3300
054 TMF1501
054 TMF4700
054 TMF6801
054 TMF8201
054 TMF4300
054 TMF47R0
054 TMF3302
054 TMF1002
054 TMF1000
054 TMF2201
054 TMF6801
054 TMF2200
054 NIR2-0.22JF ※
051 SFR001-222
054 TMF8201
054 TMF2202
054 TMF1501
054 TMF1201
054 TMF1502
054 TMF4702
054 TMF1003
054 TMF4701
034 TTC-503 ※
054 TMF8200
054 TMF3002
054 TMF1501
032 TA1016-FG
032 TC1941-KL
032 TA1016-FG
033 B631-EF
033 D600-EF
032 TC536-FG
032 TA608-FG
AS SAME AS 501-.
X-1281-01 PCB ASSEMBLY
041 UTES1H101-FB
044 50MSAN104J
042 TP50V183J
041 UTES1H100-FB
044 50MSAN104J
CAPACITOR ELEC.50V10UF
CAPACITOR STYROL 50V330PF
CAPACITOR STYROL 50V220PF
CAPACITOR ELEC.25V100UF
CAPACITOR ELEC.50V1UF
CAPACITOR STYROL 50V390PF
CAPACITOR STYROL 50V150PF
CAPACITOR ELEC.50V10UF
CAPACITOR ELEC.50V10UF
DIODE
DIODE
RESISTOR METAL 1K
RESISTOR METAL 27K
RESISTOR METAL 330R
RESISTOR METAL 1.5K
RESISTOR METAL 470R
RESISTOR METAL 6.8K
RESISTOR METAL 8.2K
RESISTOR METAL 430R
RESISTOR METAL 47R
RESISTOR METAL 33K
RESISTOR METAL 10K
RESISTOR METAL 100R
RESISTOR METAL 2.2K
RESISTOR METAL 6.8K
RESISTOR METAL 220R
RESISTOR METAL 2W 0.22R
SEMI-FIXED RESISTOR 2.2K
RESISTOR METAL 8.2K
RESISTOR METAL 22K
RESISTOR METAL 1.5K
RESISTOR METAL 1.2K
RESISTOR METAL 15K
RESISTOR METAL 47K
RESISTOR METAL 100K
RESISTOR METAL 4.7K
THERMISTOR
RESISTOR METAL 820R
RESISTOR METAL 30K
RESISTOR METAL 1.5K
TRANSISTOR(2SA1016K-FG)
TRANSISTOR(2SC1941-KL)
TRANSISTOR(2SA1016K-FG)
TRANSISTOR(2SB631K-EF)
TRANSISTOR(2SD600K-EF)
TRANSISTOR(2SC536K-FG)
TRANSISTOR(2SA608K-FG)
CAPACITOR ELEC.50V100UF
CAPACITOR FILM 50V0.1UF
CAPACITOR MYLAR 50V0.018UF
CAPACITOR ELEC.50V10UF
CAPACITOR FILM 50V0.1UF
C424
D421-423
K401-404
R401-406
R407-412
R415
R416.417
R418.419
R420
R421
R422
R423
R424
R425
R426
R427
R428
R429
R430
S401
S402.403
S404
T421.422
T423
U421
C951-954
C955
C956
C957
C958
C991.992
D951-954
D955
D956
F991
L951
R951
R952
R953
R954
R955
R956.957
R958
R959
R960
S991
S992
T951-953
U951
R451-453
041 UTES1E101-FB
034 T1N4148-86
066 4TR-2709#3
054 TMF1001
054 TMF1003
054 TMF1502
054 TMF1002
054 TMF1502
054 TMF1002
054 TMF1001
054 TMF2202
054 TMF2203
054 TMF1203
054 TMF2202
054 TMF1002
054 TMF1003
054 TMF1800
054 TMF4702
054 TMF4703
064 4TR-2294
064 C-4606A00
064 C-4660A00
032 TC536-FG
032 TA608-FG
031 PC817B
X-1281-02 PCB ASSEMBLY
043 TC500V103
041 UTES1H471
041 UTES1E101-FB
041 UTES1E221-FB
042 TP50V103J
044 DE1307E472M※
034 T1N4003-TB
034 TRD15JST1
034 T1N4148-86
036 5ST250※
022 T-1070N01 ※
054 TMF3901
054 1WS1KJF ※
054 TMF8203
054 TMF4702
054 TMF1004
054 TMF1003
054 TMF4702
054 2WS470JF ※
054 TMF2202
061 C-4176A08 ※
063 DH1U-24※
032 TC536-FG
031 NJM555D
019 C-3417A
X-1281-03 PCB ASSEMBLY
051 4TR-2972
CAPACITOR ELEC.25V100UF
DIODE
2P PINJACK
RESISTOR METAL 1K
RESISTOR METAL 100K
RESISTOR METAL 15K
RESISTOR METAL 10K
RESISTOR METAL 15K
RESISTOR METAL 10K
RESISTOR METAL 1K
RESISTOR METAL 22K
RESISTOR METAL 220K
RESISTOR METAL 120K
RESISTOR METAL 22K
RESISTOR METAL 10K
RESISTOR METAL 100K
RESISTOR METAL 180R
RESISTOR METAL 47K
RESISTOR METAL 470K
SLIDE SWITCH (INPUT A)
SLIDE SWITCH (INPUT B.C)
SLIDE SWITCH (SIGNAL SENSE)
TRANSISTOR (2SC536K-FG)
TRANSISTOR (2SA608K-FG)
PHOTO COUPLER
CAPACITOR CERA.500V0.01UF
CAPACITOR ELEC.50V470UF
CAPACITOR ELEC.25V100UF
CAPACITOR ELEC.25V220UF
CAPACITOR MYLAR 50V0.01UF
SPARK KILLER
DIODE
ZENER DIODE
DIODE
MINI FUSE 250VT250MA
SUB TRANSFORMER
RESISTOR METAL 3.9K
RESISTOR METAL 1W 1K
RESISTOR METAL 820K
RESISTOR METAL 47K
RESISTOR METAL 1M
RESISTOR METAL 100K
RESISTOR METAL 47K
RESISTOR METAL 2W 470R
RESISTOR METAL 22K
POWER SWITCH
RELAY
TRANSISTOR(2SC536K-FG)
IC(TIMER)
FUSE CLIP
VARIABLE RESISTOR 50KBX2
SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION

3
Parts List-2
D481-483
D484.485
D486
D487.488
D489
D490.491
D492
K431
C801.802
C811
C812
C813
D811
D812
K811
L801.802
R801.802
R811
R813
R815
R816.817
R818
R819
R820
R821
S811
T811
U811
831-.861-.
C901-904
C905.906
C931.932
C933
D901
X-1281-04 PCB ASSEMBLY
034 LTL4262N
034 LTL4296N
034 LTL4262N
034 LTL4296N
034 LTL4262N
034 LTL4296N
034 LTL4262N
019 4TR-3213
X-1281-05 PCB ASSEMBLY
067 C-4635A02
X-1282-01 PCB ASSEMBLY
044 50MSAN104J
041 UTES1E101-FB
041 UTES1E470-FB
041 UTES1H4R7-FB
034 T1N4148-86
034 TRD5.6JST1
067 C-4493A01
021 TRL-331
054 2WS10JF ※
054 TMF1003
054 TMF5602
054 TMF1502
054 TMF1203
054 2WS1.2KJF
053 CR14-104J-A
053 CR14-474J-A
054 TMF1502
063 DH2TU-24
032 TC536-FG
031 MPC1237HA
AS SAME AS 801-.
X-1282-02 PCB ASSEMBLY
043 TC500V103
041 50USP682 ※
043 TC500V103
041 UTSS1H101-FB
034 RS403L ※
LED
LED
LED
LED
LED
LED
LED
LED HOLDER
2P TERMINAL BLOCK
CAPACITOR FILM 50V0.1UF
CAPACITOR ELEC.25V100UF
CAPACITOR ELEC.25V47UF
CAPACITOR ELEC.50V4.7UF
DIODE
ZENER DIODE
SPEAKER TERMINAL
SPEAKER COIL
RESISTOR METAL 2W 10R
RESISTOR METAL 100K
RESISTOR METAL 56K
RESISTOR METAL 15K
RESISTOR METAL 120K
RESISTOR METAL 2W 1.2K
RESISTOR CARBON 100K
RESISTOR CARBON 470K
RESISTOR METAL 15K
RELAY
TRANSISTOR(2SC536K-FG)
IC(PROTECTION)
CAPACITOR CERA.500V0.01UF
CAPACITOR ELEC.50V6800UF
CAPACITOR CERA.500V0.01UF
CAPACITOR ELEC.50V100UF
BRIDGED DIODE
D902.903
D931.932
F901.902
R901
R902
R931
911-.921-.
034 T1N4003-TB
034 T1N4003-TB
036 5ST6.3 ※
054 TMF3R30
054 TMF1802
054 TMF47R0
069 C-3417A
AS SAME AS 901-.
HEAT SINKER ASSEMBLY
017 SQ4-16A00
019 TO-220
019 TO-3PL
032 D600-EF
033 A1943-RO
033 C5200-RO
OTHERS
011 FP-512
012 4TSA-7
012 SD4-16A00
014 4TR-2797#3
014 SQ3-15A00
015 RP-367
019 4TR-2823#2
019 4TSH-19#2
022 T-1076N01 ※
034 SEL1124R
069 C-4629A01 ※
072 C-4621A01 ※
072 C-4622A01 ※
072 C-4623A01 ※
072 C-4624A01 ※
081 SQ4-31A00
081 Z-203
DIODE
DIODE
MINI FUSE 250VT6.3A
RESISTOR METAL 3.3R
RESISTOR METAL 18K
RESISTOR METAL 47R
FUSE CLIP
HEAT SINKER
INSULATION SHEET (S)
INSULATION SHEET (L)
TRANSISTOR(2SD600K-EF)
POWER TRANSISTOR(2SA1943-RO)
POWER TRANSISTOR(2SC5200-RO)
FRONT PANEL ASSY
KNOB 11F
PUSH BUTTON 12F
ORNAMENT SIDE BOARD
UPPER COVER
REAR CHASSIS
PLASTIC FOOT 24F
PLASTIC FOOT 50F
POWER TRANSFORMER
LED
AC INLET
AC CORD SET for STD
AC CORD SET for AUSTRALIA
AC CORD SET for UK
AC CORD SET for CEE
INSIDE CARTON
STYROL MOULDING
SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION
NOTE ON SAFTY : Symbol ※Fire or electrical shock hazard. Only original parts should be used to replaced any part marked with symbol ※.
Any other component substitution (other than original type), may incease risk of fire or electrical shock hazard.

4
Instruments : DC milli–meter
Notes : Prior to Bias Adjustment, run about 5minutes with rated output (8 ohms)
And warm up Power Transistor and Heat Sink.Set input off.
Step
K31
K32
X-1280-01 PCB R537
R538X-1280-01 PCB
1
2
K33 R637X-1280-02 PCB
3
K34 R638X-1280-02 PCB
4
K35 R737X-1280-03 PCB
5
K36 R738X-1280-03 PCB
6
Coupling Location Adjust forAdjust
DC milli-voltmeter Reads 4mV
Adjustment
Service Note
Cautions during Inspection and Repair
1. Keep in mind the safety warnings
The safety instructions are shown as the labels or printings on the exterior, the
inside chassis or the parts, etc. Refer to the instructions when proceeding with
inspection or repair.
2. Use only the specified parts for replacement
The selected parts are used at critical area to reduce fire hazard or electrical
shock. So when replacing these parts where designaged with marks or
※marks on the schematic diagram or the parts list, ensure to use only the
same parts.
3. Ensure to dress back the AC (Mains) cord to the original position
If for some reason, the AC cord is moved or partially disassembled, ensure to re-
route or assemble back to the original position. The AC cord area is protected and
secured by tubing and insulation materials for the sake of safety, so that no loose
wire will touch and cause fire hazard and electrical shock.
4. Check for safety aspects after inspection or repair
Ensure all parts, such as screws or wires, removed during inspection or repair are
secured back to the original positions, and check visually for any anomaly. Also
check for any electrical leakage or resistance to maintain the safety.

5 6
2SA1943
2SC5200
2SB631K
2SD600K
2SC536K
2SA608K
2SA1016K
NJM555D
2SC1941 MPC1237HA
PCB Assembly-1Case Outline

7 8
PCB Assembly-2

9 10
PCB Assembly-3

11 12
Schematic Diagram