Sherwood RV-5030R User manual

SERVICE MANUAL
RV-5030R
STEREO A/V PROLOGIC RECEIVER
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Circuit
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Specifications:
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P.C.Board
Parts
List-..-:-..::ccccessessccssececscseresseseses
36
Circuit
Description
Semiconductor
Lead
Identification
Alignment
Procedures
&
Internal
Diagram
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Semiconductor
Voltage
Chart
Wiring
Diagram
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Schematic
Diagram
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Chassis
Parts
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S Sherwood

SAFETY PRECAUTIONS
Service
Should
not
be
attempted
by
anyone
unfamiliar
with
the
necessary
precautions
on
this
player.
The
WARNING
following
precautions
are
necessary
during
servicing.
1. Many electrical and mechanical parts in this
player
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 AX 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 characterstics 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 exposed metal parts of the cabinet, such
as terminals, screw heads, metal overlays,
etc., to be sure the set is safe to operate
without danger of electrical shock. .
Plug the AC line cord directly into a 120 V AC
outlet(120
V
AC
version
only).
(Do
not
use
a
line isolation transformer during this check.)
Use an AC voltmeter, having 5000 Q per volt
or greater sensitivity, in the following manner:
Connect a 1500 Q 10 watt resistor paralleled
by a 0.15 uF 150 V AC capacitor, between a
known good earth ground (water pipe,
conduit, etc.) and the exposed metal parts,
one
at
a
time.
Measure
the
AC
voltage
across
the combination of a 1500 Q resistor and a
0.15 iF capacitor. Reverse the AC plug at the
AC outlet and repeat AC voltage
measurements for each exposed metal 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.
(5000
Q
per
volt
or
greater
sensitivity)
Reading
should
not
exceed
0.75
V
~ Receiver
AC Outlet
OQ) AC VOLTMETER
Good earth ground such as
a water pipe, conduit, etc.
0.15 #F 150V AC
Place this probe on each exposed metal part.

SPECIFICATIONS
[audio
Sesion
Front
———SSSSCSCSCS~S~S~dr
[Nominal
RMS output power:
at distortion below 0.2% 20 Hz
both channels driven at 8 Q
at distortion below 0.2% 1 kHz
both channels driven at 8
Inter-modulation distortion
at 80W output 60 Hz : 7 kHz=4 : 1 Smple
Hoarmonic distortion at 80 W output : 20 Hz
1 kHz 0.1 9
20 kHz 0.15 0.2
Frequency response at AUX
8
Q
load,
1
W
output
;
20
Hz-20
kHz
oa
|
+1.5
Input
sensitivity
for.
80
W
output
:
PHONO
2.5
—
2.5+0.4
CD / AUX 150 150+30
Tone
control
BASS,
100
Hz
+10 +12
TREBLE, 10 kHz +10 +12
Phono
amp
overload
at
0.5%
THD
-30
dB
160
140
°
Loudness compensation at Volume’: “st
100 Hz +6 +6242
10 kHz +3 4341.5
Channel separation with 4.7 kQ shorted
at AUX input 1 kHz 62 45
10 kHz 53 35
Signal to noise ratio, input shorted
with IHF-A PHONO at 10 mV | = 5
CD, TV/AUX, TAPE1 a
Audio Section-Center
RMS output power at distortion below 0.9% 1 kHz, 8 Q a
Signal to Noise ratio, input shorted
with IHF “A” (Dolby prologic, 3 Stereo)
-line input level 350 mV
Frequency response 8 © load, 1 watt output ee 100-21 k 150-15 k
Audio Section-Rear
RMS output power at distortion below 0.9% 1 kHz, 16 Q
Signal to noise ratio input shorted
with IHF “A” (Dolby prologic, Hall)
-line input level 350mV, Delay 20ms
’ | Frequency response 8Q load, 1 watt output
at -3dB(Dolby prologic)

Tuning
coverage
for
USA
/
Canada
87.5-107.9
Tuning
coverage
for
Europe
87.50-108.00
Usabie
sensitivity
at
noise
&
distortion
3%
75ohm
input
Image
rejection
at 106
MHz
IF
rejection
at
90
MHz
Full
limiting
at -3
dB
50
dB
quieting
sensitivity
at
98
MHz
:
MONO
STEREO
Distortion
at
1
mV
input
:
MONO
STEREO
Signal
to
noise(S
/
N)
ratio
at
1
mV
input
:
MONO
STEREO
De-emphasis
at
100-10,000Hz
AM
rejection
ratio
at 100
pV-20
mV
input
Search
level
at
98
MHz
Output
voltage
at
75
kHz
dev.
:
MONO
1kHz
mod.,
1mV
input
STEREO
0.45+0.15
Muting
threshold
at
98
MHz
3.5-10
Overload
THD
at
98
MHz,
100%
mod.
2
0.6
at
100
mV
PF
input
Spurious
response
at
98
MHz
antenna
input
3
wV,
1/21F,
2x1/21F
Capture
ratio
at
1
mV
input
Alternate
channel
selectivity
at
0.1
mV
input
Stereo separation : 100 Hz
at 100% mod., 1 mV input 1 kHz
10 kHz
Distortion :
at 100% mod., 1 mV input through IHF Filter MONO
STEREO
‘| Automatic stereo threshold
Residual 19 kHz & 38 kHz at 1 mV input
Tuning
coverage
for
USA
/
Canada
520-1710
Tuning
coverage
for
Europe
522-1611
Usable
sensitivity
600
kHz,
1010
kHz,
1400
kHz
(603
kHz,
1008
KHz,
1404
kHz
for
Europe)
at
400
Hz,
30%
mod.,
S/N=-20
dB
350 700
Image
rejection
at
1400
kHz(1404
kHz
for
Europe)
35
28
IF
rejection
at
600
kKHz(603
kHz
for
Europe)
35
30
AGC
figure
of
merit
from
100
mV/m
at
1010
kHz
45 35
(1008 kHz for Europe)
Distortion
at
400
Hz,
30%
mod.,
5
mV/m
input
0.8 2.0
IF
bandwidth
at
6
dB
down,
350
pV/m
input
8
5-12
Output
voltage
at
400
Hz,
30%
mod.,
5
mV/m
input
165
165+
40
Audio response at 5 mV/m input 1 kHz 0 dB,
1010
kHz(1008
kHz
for
Europe),
-6
dB
50-2
k
70-1.8
k
Selectivity
at
10
kHz
350
2V/m
input
25
20
Signal to noise(S/N) ratio at 1010 kHz
(1008
kHz
for
Europe)with
antenna
input
5
mV/m
40
35
RF
overload
400
Hz
80%
mod.,
100
mV
input
5
10
Search
level
500+
6dB

Speaker load impedance
Power consumption :
No signal
Full signal at both channels
220 V 50 Hz 400 waits
240 V 50 Hz 400 watts
Dimensions
(W)17.3
7
x
(H)5”
x
(D)15”
(W)439
x
(H)127
x
(D)381mm
Weight(Net)
22
|bs(10
kg)
Power Requirements :
: 120 V 60 Hz for American/Canadian Version
:
120/220
V,
60/50
Hz
for
Multi-voltage
Version
(switchable)
:
230
V
50
Hz
for
General
European
Version
:
230
V
50
Hz
for
German/ltalian
Version
: 240 V 50 Hz for U.K/Australian Version
:
230
V
50
Hz
for
swiss/Scandinabian
Version
TIMOOW>SYS
Note
:
Nominal
specs
represent
the
design
specs.
All
units
should
be
able
to
approximate
these-some
will
exceed
and
some
may
drop
slightly
below
these
specs.
Limit
specs
represent
the
absolute
worst
condition
_that
still
might
be
considered
acceptable
;
in no
case
should
a
unit
fail
to
meet
limit
specs.
5

CIRCUIT
DESCRIPTION
—
‘4
bit
CMOS
Microprocessor:CXP50116-530Q
VOL. INDICATOR—PC1
*-TAPE M, MUTE~PCO
Jem AM STEP
—PD3 +—+PD2
‘
am
a ee
“VCR 1 +PC2
—*VOL. UP-S0/PHO — SURR+S2/PH2
— Vepp
e) —* VOL. DOWN<-S1/PH1
=) —* STAND BY+-S3/PH3
+—EXTAL
) — Vaer
2 : 2 : 2
PS g
2
$4/PG0— )—+PD1—TUNED
S5/PG1+— @ ¢3)+—+PD0+-STEREO
S6/PG2—) @)+—+PY3/RMC
@)++-PY2/WP+ POWER DOWN
i) -PY1/PWM-— CE5(IC508)
69+—+PY0-+ TUNER MUTE
§}«—+PE3—+ CENTER MUTE
G)+—-PE2— SURR. MUTE
66)—+PE1—* MAIN MUTE
65+ PEO CE4(IC101 IC 102)
6)—+PF3— (IC506
CXP50116-530Q
63<—+PF2—+
CECE)
G)+—+PF1— CE1 (IC802)
<—+PFO-- FM MODE
G)—+PA3—> DATA {ict01, 10102, 1C506
@)—»PA2—~-
CLK
\IC508,
C509,
1C802
@)—+PA1—> C-LINK
$7/PG3-—@
$8/PKO<— ©
$9/PK1+-©
$10/PK2—()
S11/PK3—
SEG $12/PJ0<—©
$13/PJ1—
$14/PJ2—@
$15/P53+-@
$16/T15—@
$17/T14—@)
$18/T13+—@
$19/T12— @
$20/T11—@
$21/T10-— (8) @)+—+PA0+— DIGI-LINK
$22/T9— 9 @§+—+-PX2/SI+- VCR2 F/R
$23/T8<— @ @)-—+PX1/SO--REMOCON
T7<~@ @)++PXO/SC-PROTECTION
T6—@ @<— EC
@— PB3/AD7+-SURR. MODE
@)—+PB2/ ADG-
8-39-40
GRID 13
wT LO
Qa
~o~6
H
oo
-
rae
" ;
KEY MATRIX ~2EQORO«
i hom Boke
bbe

Input and Output Terminal Functions
Code
S4/PGO-S19/T12 These are segment signal output pins of FL controller/driver.
$20/T1-S23/T8
T7-To
These are timing signal output pins of FL controller/driver
and key scan pins.
This is external interrupt dedicated pin.
TX, TEX Not used
RST This is the system reset of the device.
No connection
This is the power supply pin.
These are the key input pins.
PIO/ADO-PB1/AD5
PB2/AD6
PB3/AD7 This is the channel mode control pin of surround mode.
m QO
<|z -
PX0O his is the protection input pin.
his is the remote control input pin.
U
|
ais
PX2
PAO
PAI This is the mechanical deck control pin
PA2-PA3 These are used to control the PLL IC, analog switching IC.
shift register IC, volume IC, delay IC.(CLK, DATA)
PFO This is the FM mode control pin.
PF1 This is used to control the PLL IC.
PF2 This is used to control the shift register IC.
PF3 This is used to control the volume IC.
This is used to control at analog switching IC.
This is the main mute output pin.
zu
|
PE2 This is the surround mute output pin.
This is the center mute output pin.
PYO This is the tuner mute output pin.
PY1 This is used to control the delay IC. ;
PY2 This is the power down pin.
PY3
his is the tuner stereo input pin.
his is the tuner tuned input pin.
hese are used to control FM and AM step.
This is used to eliminate the noise of the PLL IC
in the Tape 2 Monitor mode.
This is used to control volume indicator.
PC2 This is used to control VCR1
his is used to control VCR2
his pin provides the ground potential.
hese pin serve for connecting a clock oscillator crystal.
jo connection.
vu Ss
PD2-PD3
PCO
4
U U | |
eo —
XTAL, EXTAL
Zz
VREF
VFDP
PHO-PH1
PH2
PH3
|
his is the power supply pin of the FL controller.
hese are used to control the motor volume.
his is used to control surround speaker.
his is used to control stand-by mode.
ajala
Zz <=
7

Digital Tuning System Description
FM ANT
AM ANT
<Qegm FV PLL Loop
<<] AM PLL Loop
FM FRONT END PACK
oe
ee
7
H
|
|
FM
RE
FM
MIX
1
Low
Pass
Filter
!
1.
Q802,803
|
|
FM OSC
I
PLL Prescaler
|
FM IN
|
i
IC802
”
AM
IN
:
1 Display

Control Key and Mode Switch Matrix
Searching for Station
Automatic Tuning
Press
the
AUTO
SEARCH
key
for
automatic
tuning
Pressing
the
TUNE
A
or
TUNE
V
key
causes
automatic
up
or
down
searching
for
a
station
until
a
station
is
received.
Manual Tuning
By
pressing
the
TUNE
A
or
TUNE
V
key,
the
frequency
is
changed
by
a
step.
If
the
key
is
kept
pressing
scanning
is
continued
until
the
key
is
released.
Memory
The
tuning
information
is
stored
into
an
internal
RAM
by
pressing
the
MEMORY
key
and
then
pressing
one
of
30
preset
locations
while
the
memory
indicator
‘MEMORY’
blinks.
/
If
no
key is
pressed
while
the
indicator
blinks,
the
memory
function
is
canceled.
M1 to M10
Thirty AM and FM stations can be recalled from internal RAM. When it is switched from one band to the
other band, the tuner tunes to the station last tuned on that band. Each time a station is changed, the
controller provides a signal to mute the tuner.
bac
VCRi ° SURR.
DUB : MODE
DAG

Protection Circuits
Speaker Protection Circuits
The
CPU
protects
both
this
unit
and
the
speakers
when
an
abnormally
high
current
flows
in
Q212
L/R
and
Q213
L/R
due
to
excessive
input
drive,
too
low
of
a
load
impedance,
or
short
of
the
speaker
terminals.
If
current
increase
is
excessive
the
voltage
across
R226
L/R
turns
on
Q216
L/R,
then
Q217
turns
on
Q215.
It
makes
the
protection
port
of
the
CPU
to
low
state,
and
the
CPU
turns
off
Q201
and
RLY-1.
Then
the
power
is
tunred
off.
1N4148
Q216L TO INPUT B’D
C1815 “Ki
330 10/50 Ce
ss
To
SPEAKER B’D ;
22K R239 TO CPU
R237 (PROTECTION)
\Q0214 wa
(|
24K
ey
C1815
i)
st
oO
ra
ao
x<
iQ
as
R244
TO R channel
10

Thermal Protection Circuits
This
receiver
has
a
overload
thermal
protection
circuits
to
guard
against
abnormal
operation.
When
The
temperature
of
TRANS
POSISTOR
installed
with
the
main
transformer
rises
abnormally,
the
resistance
of
the
posistor
becomes
larger
and
Q215
is
turned
on.
It
makes
the
protection
port
of
the
CPU
to
Low
state,
and
the
CPU
turns
off
Q201
and
RLY-1.
Then the power is turned off.
IN4148
C1815 HK
- 10/50
IN4148
V7
Q215
22K
R239
to
cpy
C1815
R288
(PROTECTION)
.
pe \0214
( M2
octets +15 15
.—
E)
1.5K R234
R235 F225 4.3K
7.5K
iS
CNT217 ies)
TRANS
Bind
11

Vco Voltage ({V)
Vco Voltage (V)
Vco vs. FM Band Frequency Curve
PEEEEEF EEE
AECEREE EEE rr
ae a BET aa
Se Bee a Ge me
CESS SC Ee eae BET
ad DG A i Oa a
et eee aati tala ey ata
Bl 0 a
if Fo oo eae ey 6 wee
Pe te
aa See HEH EEE
OS
DSGSC= «ao See
seeceesreee Esra cotsSaesae
EERE EERE EEE
875 89.5 91.5 93.5 95.5 97.5 99.5 101.5 103.5 105.5 107.5
FM Band Frequency(MHz)
Vco vs. AM Band Frequency Curve
oe eee ee ae
Peat Re SERRA EE ARR ARES
SE Pe eke ree ee LI] TA
eel fRRRRBR AR eee
ERERSERB.
PEE CCE ENE
520 600 700 800 900 1000 1100 1200 1300 1400 1500 1600
BRE: GERR
paeNa
AM Band Frequency (kHz)
12

‘ Level Diagram
Balance Volline
yi a
aker | -
Volume Pe
vA Amp
26.2V| 85.8W
8Q
Voltage Gain in dB
Audio Frequency (1kHz)
13

ALIGNMENT PROCEDURES
Equipment Required
e AM signal generator e Audio generator
® Oscilloscope e Distortion meter
¢ AC voltmeter e DC voltmeter
e FM signal generator e Frequency counter
e Stereo modulator
Note: Remove line cord antenna from FM external antenna terminal when aligning.
Alignment and Test Points (Tuner P.C.Board)
AM IF and RF Alignment
Preparation ;
1.
Output
of
Signal
Generator
should
not
be
higher
than
necessary
to
obtain
an
optimum
output
reading.
2.
Signal
Generator
Modulation:
30%.
3.
Switch:
Press
to
AM.
Signal ~ Receiver Equipment Adjustment
Generator Frequency on Connection Point
Frequency the Display
450
kHz
Place
at
a
non-
AC
voltmeter
Maximum
(400
Hz,
Mod.)
interference
spot}
to
TAPE
OUT
reading
around
600
kHz
|
jack.
600 kHz 600 kHz T801
(400 Hz, Mod.) (ANT Coil)
1400 kHz 1400 kHz TC801
(400 Hz, Mod.) (ANT Trimmer)
1000
kHz
1000
kHz
FL
display
Indication
on
(400
Hz,
Mod.)
TUNED
receiver
with
indicator
output
of
500
nV/m
14

FM IF Alignment
Preparation
1.
Signal
Generator
output
should
be
no
higher
than
necessary
to
obtain
an
optimum
output
reading.
2.
Switch:
Press
to
FM.
3.
Signal
generator
deviation:
75
kHz.
4.
Be
sure
to
disconnect
FM
line
cord
antenna
during
alignment.
Signal
Receiver
Equipment
Adjustment
Generator
Frequency
Connection
Point
Frequency
Display
98.1
MHz
98.1
MHz
Distortion
Minimum
(1
kHz,
Mod.)
meter
to
distortion
TAPE OUT jack
98.1
MHz
98.1
MHz
Same
as
Zero
reading
(1
KHz,'Mod.)
.
Step
1
on
AC
voltmeter
:
with
SSG
output
level of 6 pV
Tape out
2" (60Cm)
Receiver
AM
Signal
Generator
—
ee
woane
ee
em
ee
ee
ee
ee
ce
ee
ee ee
——
ee
ee ee
AM
Signal
Generator
Direct Coupling
AM Alignment Connection
1250 (112.50)
O
Zin=502
(752)
©)
Z
out=3002
(Balanced)
O
1500
FM
Dummy.
Antenna
to
3000
Antenna
terminal
of
receiver
FM Dummy Antenna
15

MPX Alignment
pc '
Voltmeter Tape Out
FM Antenna Receiver
Terminal (3000) | fT
. FM Dummy
FM Signal © Tuner
Generator etki nna LT BL Front-End
es oe
FM RF/IF and MPX Alignment Connection
Preparation
. Switch: Press to FM.
. Tune for 98 MHz on band. |
. Signal Generator output level: 1000 nV.
: Deviation: 75 kHz, at 100% modulation of composite signal.
. Connect Signal Generator to FM antenna terminal through FM dummy antenna (300 ).
aRWN=
19
kHz
Signal
Output
Adjust
for
Modulation
Generator
Indicator
Level
Frequency
Connection
Setting
Pilot off Carrier only Frequency counter
: connect to TP4
1 (HOT) of PCB
and ground
8% mod. Composite to AC voltmeter to Adjust for about
2
channel
TAPE
OUT
jack
450mV
of
audio
output
ikHz R of R channel
8%
mod.
Composite
to
AC
voltmeter
to
AC
voltmeter
reading
channel
TAPE
OUT
jack
should
be
at
least
IkHz
L
of
R
channel
33dB
below.
8%
mod.
Composite
to
AC
voltmeter
to
Same
as Step
3.
channel
TAPE
OUT
jack
1kHz
R
of
L
channel
If
you
could
not
obtain
—35
dB
readings
in
Steps
3
and
4
(compared
with
Step
2),
readjust
VR804
until
you:
obtain
—33dB
readings
for
both
Steps
3
and
4.
Nominal
is
—
43
dB.
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TROUBLESHOOTING
aa ae and Remedy
Receiver
inoperative
A)
Faulty
AC
power
cord.
(FL
indicator
does
not
light)
Replace.
B)
Defect
in
the
power
switch.
Replace.
C)
Broken
wire
in
the
power
transformer.
Replace
the
power
transformer.
D)
Blown
power
Replace
the
fuse.
Fuse
blows
when
power
is
turned
on.
A)
Defective
power
transformer.
Replace.
B)
Short
in
the
primary
or
secondary
of
the
transformer
circuitry.
Repair
the
short
C)
Damaged
rectifier
D208
to
D211
Replace
the
defective
componeni(s).
D)
Short
circuit
in
the
rectifier
circuit.
Repair
the
short.
A) Speaker switch A or B defective.
Replace the defective switch(es).
B)
Defect
in
transistor
Q212!
L/R,
Q213
L/R
on
the
Main
Amp.
Board.
Replace the defective component(s).
Speaker
A
inoperative
A)
Speaker
switch
A
defective.
Replace.
Speaker
B
inoperative
A)
Speaker
switch
B
defective.
Replace.
One
channel
does
not
work
when
A)
Defect
in
transistor
Q212
L/R,
Q213
L/R
onthe
Main
Volume
is
at
maximum
with
a
test
Amp
Board.
signal
applied
to
the
center
terminal
of
Locate
and
correct
the
defect.
.
Volume
control
VR5
of
the
dead
B)
Break
in
copper
foil
of
printed
circuit
board.
channel
Repair
the
short.
C) Short in speaker output terminal.
Repair or replace.
Power indicator lights but no sound from
both channels
Speaker works normally but headphones
inoperative
A) Headphone plug does not mate with jack.
Replace the plug.
B) Defective resistor R901, R902.
Replace.
A) Poor contact in phono input jack.
Repair or replace the jack.
B) Defective phono switch or IC103.
Replace.
PHONO input inoperative
LOUDNESS
has
no
effect
A)
Defective
loudness
switch.
Replace.
B) Defective resistor R601, R602, R603, R604, C601,
C602, C603, C606.
Replace the defective components(s).
A) Defective front-end. (FE306-A15)
Replace.
B) Defective FM switch.
Replace the switch.
FM inoperative
21

FM inoperative
Poor multiplex separation
STEREO indicator does not light
FM volume not sufficient
FM Mono has no effect
AM inoperative
Bass control has no effect
Cause and Remedy
C)
Defective
transistor
Q801,
Q805,
Q806,
1C801,
1803.
Replace
the
defective
transistor(s)
or
IC(s).
D) Defective coil T803 or T804
Replace the coil(s).
E) Defective lead-in.
Repair or replace the lead-in.
F)
Ceramic
filter
CF801,
CF802,
CF803
defective.
Replace
the
defective
ceramic
filter(s).
G) Defective controller circuit component.
Replace.
A) Improper adjustment.
Readjust VR803 and VR804.
(Refer to MPX Alignment.)
B) IC803 defective.
Replace.
C)
Variable
resistor
VR803
or
VR804
defective.
Replace the variable resistor(s).
A) Defective indicator in FL.
Replace.
B)
Improper
adjustment
of
VR803
of
tuner
board.
Make
readjustment.
C) Defective IC803
Replace the defective component.
A)
If
volume
fron
both
L
and
R
channels
is
not
loud
enough:
Front
end
Section
defective
Faulty
1C801,
Coil
T803,
Defective
C838
of
tuner
Board.
if
sound
of
one
channel
is
not
loud
enough:
Defective
T806,
T807
A) Defective FM MODE switch.
Replace.
A) Damaged IC801 of tuner board.
Replace.
B)
Defective
T801,
T802,
T805
or
CF804
of
tuner
board.
Replace
the
defective
component(s).
C) Resistor R829, R817 defective.
Replace the defective component(s).
D) Capacitor C836, C818, C813 defectiv.
Replace the defective capacitor(s).
E) Defective AM switch.
Replace.
F) Defective varicap diode VD1, VD2
Replace varicap diods(s).
G) Damaged AM loop antenna.
Repair or replace.
H) Defective controller circuit component.
Replace.
A) Variable resistor BASE defective.
Replace.
B)
Defective
R720-722,
R725,
C707,
C717,
C711,
C714.
Replace
the
defective
component(s).
22