Sherwood RD-6106/G/RDS User manual

SERVICE
MANUAL
RD-6106/G/RDS
DOLBY
DIGITAL
AC-3/DTS
READY
RECEIVER
SERERRER te
bts ORAL Eohve Lee
= CONTENTS «
SPECIFICATIONS
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MECHANICAL
PARTS
LIST
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DIAGRAM
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EXPLODED
VIEW
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WIRING
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ELECTRICAL
PARTS
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CIRCUIT
DESCRIPTION......ccccsccssssssseererereeeerees
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PRINTED
CIRCUIT
BOARDS
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ALIGNMENT
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©
Sherwood.

SAFETY PRECAUTIONS
WARNING
Before servicing this unit, familiarize yourself with the following precautions:
1.Many electrical and mechanical parts in this
chassis have special safety characteristics that
often pass unnoticed and the protection
afforded by them cannot necessarily be
obtained by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts that have these special
safety characteristics are identified in this
manual and its supplements: electrical
components having such features are
identified by A\ in the schematic diagram and
the parts list.
Before replacing any of these components,
read the parts list in this manual carefully. The
use of substitute replacement parts that do
not have the same safety characteristics as
specified in the parts list may create shock,
fire, or other hazards.
2.Before returning the set to the customer,
always do an AC leakage current check on the
AC Outlet
At 5000 Q per volt or greater sensitivity,
the reading should not exceed 0.75 V.
Place the probe on each exposed metalic part.
exposed metal parts of the cabinet, such as
terminals, screw heads, and metal overlays, to
be sure the set is safe to operate danger of
electrical shock. Plug the AC line cord directly
into a 120 V AC outlet(USA Version) or 230 V
AC outlet(EU Version). (Do not use a line
isolation transformer during this check.) Be
sure your AC voltmeter has a sensitivity of
5000 Q per volt or greater. Then connect a
1500 Q 10 watt resistor, paralleled by a 0.15 pF
150 V AC capacitor, between a known good
earth ground(such as a water pipe, or conduit)
and the exposed metalic is parts, one at a
time. Measure the AC voltage across the
combination of a 1500 Q resistor and a 0.15 pF
capacitor. Reverse the AC plug at the AC outlet
and repeat AC voltage measurements for each
exposed metalic part. Voltage measured must
not exceed 0.75 V RMS. This corresponds to
0.2 mA AC. Any value exceeding this limit
constitutes a potential shock hazard and must
be corrected immediately.
AC Voltmeter
Good earth ground, such as
a water pipe or.conduct
0.15 uF 150 VAC.

SPECIFICATIONS
Measuring methods are based on IHF and IEC standard 268-3
Measurements conditions, unless otherwise noted :
Output resistive load = (8) ohms / Both channel driven
Tone(Bass, Treble), Balance, EQ control : Center Position , Other SW's : OFF
Nominal input level : 5mV for MM, 0.5mV for MC, 500mV for general purpose inputs
Power figures should be kept minimum 10min. between 15 and 35°C
Terminator : 1000hm for MC, 1kohm for MM and general purpose inputs
Filter : IHF-A filter R/O = Rated Output
Power supply : 120V/60Hz (A), 220V/50Hz (C), 230V/50Hz (D)
@ FRONT AMP SECTION *SUB-WOOFER SPKR: NO *SPKR LEVEL : ALL 0dB
*SOURCE DIRECT ON(TONE DIRECT MODE)
No[_bESGRIPTION | WAT | FREG. | REMARK | UWT [LT UR NOMNALLUR
CN
OS
Paes [fw
|
Te
a
EN
AA
ES
Ps
[DAMPING
FACTOR
__—S—«dT~SCiid|
te
|
Cd]
SP
Cd
Food
« [RESIDUAL NOISE =
aetie | vormax [mv |p
TOTAL HARMONIC DISTORTION (40)Hz
oD (600m) RV
(20)KHz
CONTINUOUS AVERAGE POWER wf 80 | 2
at (02)% THD co (ohms
wp [2
% [sos | s02
Zz
ss [sao [eas |
0 [FUNCTION CROSSTALK | GD=TAPEIN [‘riowne] _R/OSa8 [eB | =e050| =o515_
<0.2
290
255
255
245
12] T TROL, #(8)d 1
ONE CONTROL, #(8)dB ae a
[i | SUBWOOFER OUT (leh put CD or v
| 8 |
[08
Ev
peer [noe Feel or Pet
Le a
15 | HEADPHONE OUTPUT 2.440.4
CD (500mv) 2
DIN POWER at 1 THO eel rama

INPUT
DESCRIPTION
17 | DYNAMIC POWER OUTPUT
20 cycle ON,480 cycle OFF
LIMIT | NOMINAL
vo
j
remarn
|
unit
|
POWER BANDWIDTH -3dB
CD
D
D
Cc
Cc
Ms
9 | SLEW RATE
20 | SLEW-FACTOR cp(soomv) | |
PRE OUTPUT LEVEL GOH (200m) | He | VOLmax | V | _
SUB-CH (200mV) 1.7404 | 1.7203
2 [CINEMAEG at TW co | tere | votmex | a] ‘|
CD(500mV) | 10kHz | VOLmax. | dB | -5.5#1.5 | -5.521
DC OFFSET VOLTAGE CD | | VOL min. 70
21
Ps)
a oOo
@ REAR AMP SECTION
Measurements conditions : Input level 350mV
Rear level max, Delay Time 20ms, Master volume adj
DESCRIPTION INPUT
1 | POWER OUTPUT 0.7% THD Cc
2 | TOTAL HARMONIC DISTORTION Cc
S/N RATIO DOLBY
IHF-A FILTER, THEATER
HALL4
HALL2
} REMARK UNIT | LIMIT L/R NOMINAL
rie [tw | 07 eee
| dB | 255 | 26
cc ae
| |
| |
| kHz | iw
1W
R/O
1kHz 1W 20~7K
pf eee] 120-6 [100-7
[[vormin [mv [70 60
D
cD
LARGE cD
SMALL
D
D
au
Cc
e@ CENTER AMP SECTION
Measurements conditions : Input level 350mV
SPKR : WIDE, Center level max, Master volume adj
NO | DESCRIPTION INPUT | FREQ. | REMARK | UNIT | LIMIT | NOMINAL
POWER OUTPUT at 0.3% THD D (8)ohms > 55
TOTAL HARMONIC DISTORTION cD i % | <03- | <02
S/N RATIO, IHF-A FILTER cD | dB | 255 | =e
CD
eas a
FRE. RESPONSE LARGE ag 35~18K | 30~2IK
DOLBY MODE _ SMALL 135~18K | 120~2K
* Jomema ea CD (500mV) —— =—
D6 OFFSET VOLTAGE vor min [mv | 70 _|
e VIDEO SECTION
er)
io[ ___pesenierion | [rea | REWARK | UN Nomi
Pi fourpurcevet—_—_——~«dYCVORWVpe) | He | 750hm | Vw | 1302 | 100
ea
-5.524
%
mV CD
SINRATIO a a

TUNER SECTION
Measuring methods in confirmity with IEC standard 315
Measurements condition FM : Radio frequency = 98.1MHz, Audio frequency = 1kHz
Reference level = 1mV on ( 75ohms , 300ohms )
Deviation : MONO = +75kHz, Stereo = +67.5kHz+7.5kHz (America)
MONO = +40kHz, Stereo = +40kHz+7.5kHz (Europe)
Test Point : TP 1 = 90.1MHz, TP 2 = 98.1MHz, TP 3 = 106.1MH Filter = B.P.F at STEREO
Power supply : 120V/60Hz (A), 220V/50Hz (C), 230V/50Hz (D/RDS)
@ FM SECTION
| NO | DESCRIPTION
TUNING RANGE LOW ~ HIGH
AUTO/Man.
AUTO/Man.
TP 1
TP 2
UNIT
MHz
kHz
kHz
TP 3 dBf <23.2
STEP (A)
STEP (C/D/RDS)
USABLE SENSITIVITY
S/N = 30dB (A)
S/N = 26dB (C/D/RDS)
Bf
Bf Q.
CHANNEL SEPARATION 100Hz
1kHz
10kHz
10 | FREQUENCY RESPONSE AT +1.3dB Hz
1 | SPURIOUS RESPONSE
2 | IF REJECTION TP 1
3 | IMAGE REJECTION (A) TP 3
(C/D/RDS) TP 3
4 | AM REJECTION RATIO. (A)
(C/D/RDS)
5 | RF INTERMODULATION
16 | CAPTURE RATIO
:
:
:
:
:
w Oo
3 | FULL LIMITING SENSE (A) OUTPUT = -3dB dBf <15.2
Be (C/D/RDS) ouTpuT=-30B | = [ —-<23.2
Ps [auroscavernon——SSSOSCS~C~S~i a |
7 | TOTAL HARMONIC DISTORTION %
ee eer ans
46dB QUIETING SENS. (C/D/RDS) dBf <48.3
| t00Hz
| tke |
| 10kHz |
QW {| ow fo?) N aya or oa
=
=
V
o °

| NO | DESCRIPTION UNIT LIMITU/R | NOMINALUR
OUPUT
LEVEL
MONO
TAPE
REC
OUT
5004150
5004100
@ AM SECTION
Measuring methods in confirmity with IEC standard 315
Measurements
condition
AM
-
MW:
Radio
frequency
=
1000/999kHz,
Audio
frequency
=
400Hz
LW : Radio frequency = 207kHz, Audio frequency = 400Hz
Reference level = 5mV/m, 10mV/m on 500ohms Modulation = 30%
Test Point: MW TP1=(600)kHz TP2=(1000)kHz TP3=(1400)kHz — (A)
MW = TP1=(594)kKHz TP2=(999)kHz TP3=(1404)kHz — (C/D/RDS)
LW TP1= 162kHz, TP2= 207kHz, TP3 = 252kHz
UNIT LIMITL/R | NOMINAL L/R
(c/D/RDS) | LOW~HIGH Mw | kHz | 522~1611
DESCRIPTION
TUNING COVER RANGE (A) LOW ~ HIGH MW
1
kHz
kHz
STEP (A) AUTO/Man. kHz
automa [we [8
USABLE SENSITIVITY
S/N = 20dB
3
4
5
FREQUENCY RESPONSE at -6dB
| dB
7 | SELECTIVITY 10kHz/9kHz i a ee
ee ee Se
|B | es
|B
|B |
AGC FIGURE OF MERIT __Input=100mV, -10dB
IMAGE REJECTION MW =TP 3
LW=TP 3
oe orl
0
|
WHISTLE
MODULATION
|
<to
wm
800(+10dB
| TAPE REC OUT |
nN
AUTO STOP LEVEL
TUNED LEVEL 800(+8dB)
wmf
OUTPUT LEVEL (A) TAPE REC OUT 160460 16050
(C/D/RDS) TAPE REC OUT 15060 150+50
=
= — =
w =

a AC-3 SECTION
Measurements conditions, unless otherwise noted.
Input Funtion : LD (other digital player)
Digital Input Mode : LD COAXIAL
Main Vol. Position : 50 position.
Trim Vol. Position : All "0" dB
Test Point : Spk-out & Pre-out
Test Disc : DOLBY TEST DISC VERSION 1.0
Center, Rear Delay : Oms
|
No
|
DESCRIPTION
CONTENTS-TEST
TONE
CHAP
FF
|
c
|
Rr
[sw]
JOUTPUTLEVEL
LEVEL
JOUTPUTLEVEL
|
tH
OdBFS
L/C/RILS/RS
(2
eaBe
OUTPUT
LEVEL
30kHz
OdBFS
LFE
(Pre
Out)
_reheTe
OUTPUT
LEVEL
MAIN
VOL.
:
MIN.
1kHz
OdBFS
L/C/R/LS/RS
mel
ef
fe
[
«eps
pl
ww
OUTPUT
LEVEL
MAIN
VOL.
:
MIN.
30kHz
OdBFS
LFE
(Pre
Out
Exe
RS
|
sw
UNIT
:
a
5 CECT el
Spa eee CCT ee TE
ae
4
om
7
A
tao
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sowie
SY
ev
[cuamnec
seaman
mersweowsest
sparen
fe
|
Tels [eTs[s[o[
ow
[
fowet seraramon er tawowsrsc ————S—S—=sd omen ee Pt |
ferimeosrsa fares Te [eT
x
ia Dette cS rear] wr |e
ES
[aamew
[ee
[Le
]
Ss
ER]
oe]
ow
CHANNEL SEPARATION REF : 30kHz OdBFS LFE 18(REF)
UNIT

ee
OO
Ec
a
ese
oe
oe
ES
far
|
or
[ROBEY
soos
Te
Te
[|
es
all
ow
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CL
|
a
CI
paren
fe Ts
[5]
~e
fefststa
UNIT
ae
anes
[STs
[3]
[2
fsfstspr
[Por
|e
fees
ls
[s[oTT
REF : 1kHz OdBFS L
30Hz OdBFS LFE
REF : 1kHz OdBFS LFE
30Hz OdBFS L/C/R/LS/RS/LFE
REF : 1kHz OdBFS L/C/R/LS/RS
30Hz OdBFS L/C/R/LS/RS
ese
raven [eps sy
Te fepepe De]
ranen] eT [3 [
30Hz OdBFS LICIRILSIRSILFE | 2 frjs|s|n|
eos
ec
no
ene]
3
comenierast rere wo [| CTS [3
a Ce
Cor |
: PS me er TST
= a
CS
USING VER2.0
cans TEST)
REF : 1kHz OdBFS L/C/R/LS/RS
30Hz OdBFS LFE
REF : kHz OdBFS UCIRILSIRS
REF : 30kHz “3dBFS LIC/R/LS/RS/LFE,
ST ON > SW: NO

a DTS SECTION
Measurements
conditions,
unless
otherwise
noted
:
Input
Function
:
DVD
Digital Input Mode : OPTICAL or COAXIAL
Speker Mode : FL-CL-RL, SW-YES
Trim Vol Position : All "0" dB
Test Point : Spk-out & Pre-out
Test disc : DTS Set-Up Disc VER.2
Master vol. Position : 50
* CHAPT 10 : LEFT CH. 1kHz SINE WAVE 0dBFS
11: RIGHT CH. 1kHz SINE WAVE OdBFS
12
:
LEFT
SURROUND
CH.
1kHz
SINE
WAVE
0dBFS
13:
RIGHT
SURROUND
CH.
1kHz
SINE
WAVE
0dBFS
14 : CENTER CH. 1kHz SINE WAVE 0dBFS
15 : LFE CH. 30Hz SINE WAVE OdBFS
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