Page 1
SS
1300
LAB 1300
SERVICEMANUAL
LAB.GRUPPEN
Andersson
& Bavholm
AB
Gullregnsvagen
16
S-434
44 KUNGSBACKA
SWEDEN
Tel.
+
46 300
-
168
23
Fax.
+
46 300
-
142 46
Page 2
RU
Page 3
Page 4
880125
LAB. GRUPPEN AE SS 1300
Component-list
Resistors
Rl,
R87
R2, R8, R9
R3,
R12,
R70
R4, R5
R6
RIO, R22, R23
Rll, R28
R13, R67
R14, R15, R16,
R17
R18, R19,
R20, R21
R24
R25
R26, R37, R38,
R75, R77
R29, R30
R31, R32,
R35,
R36, R68,
R72
R33, R34
R39
R40, R41
R42
R43, R44
R45, R64
R46-R58
R62, R63,
R78
R65
R66, R74, R69
R71, R73
R76
R82
-
R81
R27
R83
R85
R127
2.2
kOhms 0.25 W
1
kOhm 1%
33 kOhms
47
Ohms
1%
422
Ohms
27 kOhms
1.8
kOhms
1%
12 kOhms
1W
100 Ohms
82
kOhms
120 Ohms
220 Ohms
10 kOhms
4.7
kOhms
1%
100
kOhms
1 MOhrn
820 Ohms 5
W
150
Ohms 0.25 W
100
Ohms 0.25 W
4.7 Ohms 5
W
2 . 2 kOhms 0.25 W
0.33 Ohm 5 W
10
‘Ohms 4 W
1.5
kOhm
56 kOhms
220 kOhms
10 Ohms
22 kOhms
3.3
kOhms
82
Ohms
120 kOhms
0.25 W
150
kOhms
220.
kOhms
(NTC)
Capacitators
Cl
C2
C3
C4
C5
C6,
C7
C8,
C9
CIO, Cll
Cl
2
C13,
C14
C17
j
C18,C109,C110
Cl
9
C20
C21
C22
C23
C26
SSI 300
C27
SSI 300
C26 Labi300
C27, Labi 300
Transistors
WQ2
Q3,
Q4
Q5, Q6,
Q15
Q17, Q20,
Q41
Q7, Q8,
Q22
Q9,
Q10,
Qll
,
Q13,
Q14,
Q16,
Q18, Q19,
Q42
Q12,
Q21
Q23-Q28
Q32-Q37
QUO
Miscellaneous
FI, F2
PI
150
pF ker
4.7
uF/35
V
lOO'uF/lOV
680
'pF ker
22 nF
150
pF ker
470
pF ker
1
nF/lOOV
22 nF/400V
1
nF
4.7
uF/lOOV
0.1
oiF/400V
220
ojF/16 V
10
I1F/50V
4.7
uF/50V
39
pF ker
1 nF/400
V
100 nF ker
0,22
uF 200V
2,2
uF 50V
BC
547
B, selected
MPSA 42
BC
557
B
MJE
350
BC 547
B
MJE 340
MJ 15022
MJ15023
Q
6015,
triac
T 6.3
A
1 kOhm,
trimpot
Diods
Dl, D2
D3, D4,
D5, D6,
D7, D8, D9,
DIO,
Dll, D12,
D24,
D30
D13, D14
D15, D16,
D17
j
D20,
D21,
D22,
D23
D18,
D19
D25,
D26
D114
15V
Zener 0.4W
1
N
4148
BAV 21
iisr
4004 ;
27V
Zener
0.4
W
1
N 5404
HS
10,
diac 10 V
Page 5
Cliplimiter
LAB
1000
/
SS
1300
/
LAB
1500
RA, RH,
RI
1
.
5Kohm 1%
RB
,
RC
15 Kohm
RD
270
Kohm
RF, RG
27 Kohm
R2,R3
Should
be removed
RIO
Change to
10 Kohm 1%
0.7W
CA
4
. 7uF/ 50V
OBS. Only
LAB
1500
QC
BC 547
QD,QE
BC 557
UA
VTC5C4
(Vactec)
SA
Switch
Page 6
R10
Page 7
R?8
lab.gruppen
LAB
13QQC
POWER
AMPLIFIER
LED
DISPLAY
irw-coai*-*
(S3C3C9C3 ©
LAB
130QC
POWER
AMPLIFIER
INPUT
BUFFER &
FAN
SPEED CONTROL
Page 8
Page 9
SS
1300/LAB
1300 POWER
AMPLIFIER
LED
DISPLAY
Page 10
880125
SS 1300
Input and LED-display
LAB.
GRUPPEN AB
Active Input
R100, R200
R105
,
R106,
R203, R204,
R205, R206
R107,
R208
R108,
R207
R109, R209
R101, R110
C101,
C202
C102,
C201
C103,
C104,
C203, C204
C105, C106,
D101,
IC1
D102
P2, P3
7.5
kOhms 1
% =29dB
10
kOhms
1%
4
20 kOhms
1%
100 Ohms
4.7
kOhms 5W
47
yiiF/50V
150
pF ker
47
uP/25
V
15V
Zener 0.4
W
LF 353 or
TL 072
4.7
lcOhms log pot
2
, 67kohms 1% =23dB
LED~display
R112
R113
R114
R115
R116
R117
R119, R120,
R121,
R122,
R123, R124,
R125
R126
R128,
R129,
R118
C108
D103
D104,
D105
D106-D113
Dill
Q101,
Q102
Q103
Q104-Q109
680 kOhms
0.25W
2.7
kOhms
1.2
kOhms
680 Ohms
330
Ohms
120 Ohms
33 kOhms
100
Ohms 1W
2.7
kOhms
220 Ohms
4.7
uF/lOOV
1 N'4004
LED, Yel
LED, Green
LED, Red
MPSA 42
MPSA
92
BC 547 B
Channel B:
Same as
above,
except
that it
starts
with
no. 200
Page 11
Page 12
SPEED
CONTROL
Page 13
Page 14
890417
LAB.
GRUPPEN
AB
SS 1300
Power
Supply
Resistors
R1
47 Ohms
9
W
R2
220 Ohms
4 W
R3
12
kOhms
9
W
R4
22 kOhins
0.25
W
R5,
R17
220. kOhms 0.7
W
R6,
RIO, R20,
R21
2.2
kOhms
0.25
W
R7
3.3
kOhms
50 W
R8
270
kOhms
0.7 W
R9
,
R35
330
kOhms'
"
Rll
8.2 MOhms
400 V
R12
15 kOhms
0.25 W
R13
1.2
kOhm
"
R14
1 kOhm
R15
36 kOhms
"
R16
1 MOhm
R18
39 kOhms
"
R19
470 Ohms
"
R22,
R24,
3.9 Ohms
"
R23
390
Ohms
4 W
R25-R27
0.1 Ohm
4 W
R28
220
Ohms
9
W
R32
1.5 MOhm
400
V
R36
2.2 Ohms
1 W
VR1
trimpot
2.5
kOhms
VR2,
VR3
"
10
kOhms
Diodes
D1
Rectifier
Bridge,
D2,
D6-D8
35 A
/
600
V
IN
4148
D3
IN
4004
D4,
D16
BYV
26 C
D5
12 V Zener
1 W
Dll,
D12
BYR 29-800,
D13,
D14
alt.
BYT
12PI-1000
BYT
30P-3OO
D9,
DIO
017-
IN 5818
BZW 06P15B
Mi
see11
aneous
Capacitators
Cl,
C4
0.22 uF/250
V,
RIFA
' PME
271
C2,
C3
4.7 nF/250
V,
RIFA
PME
265
C6A-C6D
C7, C14
220
nF/385
V
390
pF
ker
.
C8, CIO
C9,
Cl
2
10
uF/63
V
lOiaF/16
V
Cll
1
iiF/50
V
C13, C17
560
pF
ker.
C15,
Cl
6
10 nF
ker.
C18,
C19
1 nF
C20-C23
2200 iiF/100
V
C24,
C25
C26,
C27
C28
2.2
iiF/100
V
0.6
Tip’
4.7
'nF/2
kV
C29
C30
100
nF/50
V
10 nF
C31
0.1
^iF ker
Transistors
Q1
Triac Q6025W6
Q2 BSM
181
ICl
TDA
4700 A
IC2
TSC
429 CPA
Fan
Speed
Control
R29
4 . 7k0hms
0.7 W
R30
18 kOhms
0.25
W
R31
1 kOhm
R33
470 kOhms
"
R34
220
kOhms NTC
D15
5.6 V Zener
0.4 W
Q3 TIP
41 C
Q4
MPSA
06
Fan
1,
Fan
2
80 x 80
mm, 24 V D(
TR1
Transformer,
Ferrite N
27
LI
LAB.
Mains
filter
L2
2 layer
choke
L3-L5
1
layer
choke
FUl
T6.3A
Fuse
FU2
F10A
Fuse
SI
Power
Switch,
Marquardt
1802.0102
S2
Temp
switch
open
80°
C
Page 15
Page 16
KUNGSBACKfi
SUEDEN
Page 17
LAB 1300
RECTIFIER
BOARD
PSUA
Component-list
930201
230V AC
Resistors
Transistors
R]
-
Qi Q6025J6
R2
i MQ
500V
Q2
-
R3
33 n Q3
BC 546
R4
33 Q. Q4
TIP
41
C
R5
X
47 Q, 9W
R6
180
Q 5W
R7
2.2
n 1W
Fuse
R8
4.7 kO
1% IW
(long
leg)
FT
Fuse
T8A
H2 50V
R9
470
kH
RIO 18
kO 1%
R1
1
1.8 kQ
Switch
R12
0 Q
R13
4.7 Q
sr
Marquart
1552.3102
Capacitors
Chokes
Cl
o.n
m-F
x
C2
X
2.2 nF
Y
DRV
2.7mH 8A
220V
C3
X
2.2
nF Y
DR2
X
2.7mH 8A
220V
C4
0.22
pF X
C5
X
2.2
nF Y
C6
X
2.2 nF
Y
x
110V
AC
C7 100
pF 50V
C8a 220
pF 385V
R5
22 Q 9W
C9a
220
pF
385V
C2
4.7
nF Y
C8b
x
-
C3
4.7 nF Y
C9b
x
-
C5
4.7 nF Y
C8c
1800
(iF 200V
C6
4.7
nF
Y
C9c 1800
pF
200V
C8b
1500 pF
200V
Cl 2
3300
pF 100V
C9b 1500
pF 200V
Cl 3 3300
pF 100V
FI
F30A
C14
3300
pF 100V
F2
Circuit
Breaker
Cl 5
3300
pF 100V
S2
Marquart
1803.0102
C16
22
pF
16V
DR1 1.4mH
16A 11
OV
Cl
7
2.2
pF 63V
DR2
1
.4m H
I6A 1
10V
Diods
D1
600V 35A
D2
BYW26C
D3
BYT30PI400
D4
BYT30PI400
D5
5.6V Zener
Page 18
LAB
1300
SWITCH-TRANSISTOR
BOARD
PSUB
Component-list
921030
Resistors
Capacitors
Transistors
R1 18 kQ
9W
Cla
220
pF 385V
Ql
BUP 307
R2
18 kQ
9W
C2a 220
pF
385V Q2
BUP
307
R3 18 kQ
9W
Clb
220
pF 385V
Q3
BUP
307
R4 100
Q 5W
C2b
220
pF 385V
Q4
BC
327
R5
100 Q 5W
Clc
1800
pF 200 V Q5
TIP
50
R6
0.1 Q4W
C2c
1800
pF
200V
Q6
BC547
R7 0.1 Q
4W
C5 0.6
pF 500V
R8
0.1 Q4W
C6 2.2
nF 1.5 kV
R9
1.5 kQ
2W
Cl
10
pF 63V
Switches
R10 4.7 kQ
5W
C8
10
pF
50V
Rll 4.7 Q
C9
10
pF 50V
S2
Tempswitch
R12 15 kQ
1%
CIO
4.7
pF 50V
R13 82 kQ
1%
CM 1 nF
R14
36.5 kQ
1%
C12
330
pF
R15 15 kQ
1%
C13
10 nF
*
from
931101
R16 180
Q
C14
10 nF
R17 220
kQ 1%
Cl 5
330
pF
R22
4,7 Q
(long
legs)
Cl 6
1
nF
R23
6.8 kQ
R18
4.7 kQ 1%
Cl 7 10 nF
R30 30 kQ
1%
R19 4.7 kQ
1%
Cl 8
1
nF
R20
432 kQ
1%
C19
10
pF 50V
R21 750 kQ
1%
C20 1
nF
R22*
470 Q C21
2.2 nF
Y
R23* 2.2 kQ
C22 2.2
nF
Y
R24 4.7 Q
R25 15 kQ
1%
R26 1 kQ
1%
Diods
R27
4.7 Q
R28 33 Q
D
I
BYT I2PI 1000
R29
I MQ 1%
D2 BYR
29-800F
R30* 22 kQ
(BYT
12
PI 1000)
R31
220 kQ
1%
D3 15V 1.3W
Zener
R32 36.5 kQ
1%
D4 5.6V 0.4W Zener
R33 270 kQ 1%
D5
IN 4148
R34 1 kQ
1%
D6 BYW 26C
R35 1 kQ
1%
D7
1 N
4004
R36 15 kQ 1%
D8 IN
4148
R37
4.7
Q
D9
IN 4148
R38 4.7 Q
D10 IN
4148
R39 4.7
Q
Dll BYW
26C
R40
1
MQ
1%
D12 BZW
06P15B
Trim potentiometers
Integrated circuits
TP1
10
kQ
Ul
TDA 4718A
TP2 10
kQ
TP3
2.5
kQ
Page 19
LAB.GRUPPEN
AB
SERVICEKIT
KEY
FOR
Switch
transistor
board
PSUB
LAB
1200
LAB
1300C
LAB2000C
R22
680
Q
4.7 Q
82
Q
R23
2.2
KQ
6.8 KQ
2.2
KQ
R28
82
a
33
n
33
Q
R30
22 KQ
1%
30 KQ
1%
30 KQ
1%
R32
50
KQ
1%
36.5
KQ
1%
36.5 KQ
1%
Rectifier
board
PSUA
LAB
1200
LAB
1300C
LAB
2000C
R8
4.7 KQ
1%
on
leg
4.7 KQ
1%
on
leg
47 KQ
1%
R9
470 KQ
470 KQ
390
KQ
RIO
Not
connected
18
KQ
39 KQ
1%
Rll
1.5 KQ
1.8 KQ
6.8 KQ
R12
330
Q
0Q
1.8 KQ
C12-15
3900^F/100V
3900|iF/100V
1800jaF/100V
Q4
TIP
41
TIP 41
BDX
53
Page 20
SS
1300
POWER
SUPPLY
WARNING:
HIGH
VOLTAGE
!
320
V
DC
potential and 1200 V
AC peak-to-peak voltage
The power
supply is a primary switchmode unit, which
means that
the
electronic components
conduct AC-line voltage.
The "
earth-symbol" in the schematic
diagram is at
line potential,
also cooling-fins and
inductors
are
at line potential.
Service and measurement of
the power
supply
1/
Please
contact the
Manufacturer, to' get
more information,
before
you
do any service of the power
supply.
2/
All
warranty service is done
exclusively by
tho
Manufacturer.
3/
Bearing
personal security in
mind, and to avoid
short-circuit
during measurement, all
instruments must
be isolated
with
tjie
help
of independent 1:1 isolation
transformers.
4/
The
switching time is very short
(nano seconds),
and the
switch
period
is
35 us. A condition
for correct
measurement and
service,
is the use of a
100 MHz
oscilloscope (for ex.
Tektronix 2215
or
better).
Page 21
LAB.GRUFFEN
NOV. 92
1
)
2
)
3)
4)
5)
6)
7)
8
)
9)
10
)
Service
in SS 1300
power
supplies.
(
VALID
FOR UNITS
WITH
PSA, ALT.
PSUA
AND
PSUB
BOARDS.
)
Required
measurement
equippment:
-Audiogenerator
-AC-voltmeter/
THD-meter
-DVM
-Two
channel
oscilloscope
for audio
-Variac
0-280V, 6A
-50
MHz
oscilloscope,
ex. Tek
2225
with
lOOx probe
ex. Tek P6009
-Isolationtransformer
for the
mains, 1:1
Turn
TP3
fully
counter
clockwise.
Change
FI
on the
PSA
(
PSUA
).
Increase the
main
voltage
slowly by the
variac.
Measure
the
voltage across
Cl.
a) No
voltage:
-change R1
(
R5
PSUA
).
b) The
current
increase quickly:
-check
Dl-PSA
-check
Ql,
Q2,
Q3.
It
is now
possible
to
increase the
voltage
across Cl
to
approx.
300 V
without
currentrush.
Connect
an
oscilloscope
via a isolation
transformer
across Ql
collector
and
emitter
Turn
TP3
slowly
until a pulse
is visible
on
the
scope. The
frequency is
approx.
27 kHz.
If the
graph is
seen, go
to item
10).
If
only
narrow
spikes is seen,
check
the
following
components.
a) D13,
D14
-PSA
(D3, D4
PSUA) or
the
output
circuits.
b) D1
(
C5 ,R1,
R2, R3
)
-makes
U1 go
into
over
voltage
protection.
c) Ql-PSA
-the
softstart
circuit will
not
deliver
enough
power.
d)
U1
-the
output will
remain low
all the
time.
If
ringing
occur
after the
flyback
pulse, it
depends
on
broken D2 or R4,
R5/C6.
Turn TP3
fully
clockwise:
a) Check
the
outputvoltage
on C22,
C23
-PSA (C13,
C15
PSUA) for
82.5V
DC
-
Adjust
with TP2.
b)
Check
the
softstart
circuit by turn on
and
off the
mainswitch and
look
at
the
oscilloscope.
c)
Increase
the power by
applying a
audiosignal
to
the
amplifier
and turn up
the
gaincontrols.-The
pulsewidth will
increase.
d)
Check the
over-/
undervoltage
protdftion
circuits by turning
the
variac up
to
280
VAC and
down to 130
VAC. (No
bad
).
V/'
CIV' IX
r
3OOv
Page 22
Lab.grupfen
1
NOV.
Si
Service
in the SS
1300
output-circuits.
Required
measurement
equipment:
-Audiogenerator
-AC
-voltmeter/
THD-meter
-DVM
-Two
channel
oscilloscope for
audio
1)
a) Identify
which
channel, A or B,
which is
broken, by
checking if the
fuse(s)
F2 and/or
F3 are
melt.
b)
Take
away the F2 and
the F3 on the
other
channel.
c)
Replace F2 and
F3 with two
resistors 47
0/
5W on
the broken
channel.
2)
Turn the
TP3 on
switchtransistor
board PSUB
fully
counter clockwise
and
turn on
the main
switch on the
amplifier.
3)
Turn TP3
slowly
clockwise until
the voltage
across C17
and C18 is
1-2V.
(TP3 is
the current
limit adjustment,
and act like
a variac in
this case.)
4)
If the
voltage
across C17 or C18
won t reach
IV without
high heat
disipation
in the
47Q/
5W-resistors,
change D22
or D23.
5)
Measure the
outputvoltage
refered to ground
at R62.
If
the
voltage is positive:
Someone of the
transistors
Q21,
Q23-Q28
is
broken.
If the
voltage is
negative: Someone of the
transistors
Q22,
Q32-Q37 is
broken.
If
the
voltage is below
+/-20mV: The
output circuits
are probably
ok.
In that
case go further
to item
7).
6)
To
determine
which output
transistor(s)
which are
defect,
proceed as
follow:
a)
Connect the DVM
with the
referens to
point R62/ R63.
b)
Measure the voltage
across the
emitter-resistors
R46-R50
and R54-R58.
c) Those
emitter-resistors with the
highiest
voltage indicate
corrsponding
defect
outputdevice.
d)
Desolder and
unscrew the defect
transistor(s).
e) Increase the
railvoltage by
turning TP3
clockwise
and measure
the
output
voltage
in accordance to
item
5).
7)
If the
railvoltage can be
increased (with
TP3
)
without any high
heatdisipation
in the
47£V
5W-resistors, the amplifier
can be
connected to
a sinewawe
source
at the
input. The
output will
be checked by
an oscolloscope.
(
The
amplifier
can run
without or
with reduced load.)
If there
still is a DC-
potential at the
output, check
the
drivertransistors
Q7-
Q9
and
Q12
and
their mica
insulations. If there
still is DC,
go to item
9).
If
the sinewawe is
distorted,
check the
DC-protection triac
QUO, if it
still
distortion
go to item
9).
Page 23
2
8)
Final
check:
Then the signal
is undistorted; replace
the two
47^-resistors with fuses,
T 6.3A.
a) Adjust the
railvoltage by TP2 to
82.5V on the PSUB.
b) Check
the quisentcurrent by
measuring the
current thru the F2, adjust to
200 mA
by PI.
c)
Check output by
a sinewawe up to full swing
into 4O load.
d) Check
of short-circuit protection:
-
Adjust outputvoltage
to 10 V AC.
-
Short the output by a
resistor 0.3
-0.50/
5W.
-
Check symetry of
the shortcircuitvoltage
across the 0.3D-resistor by
the
scope.
9)
Service in
driver circuits
a)
Desolder R12, R24 and R25.
b)
Connect a
resistor 33
kQ
between point R2£/ R27
and R1
2/
C3.
c)
Connect a scope at R22/ R27.
d) Apply
a sinewawe to the amplifier,
and the
drivercircuits can be checked
separately without
the outputcircuits.
10)
Check of
DC- voltages:
a)
D1
+15V
ref. to ground.
b) D2
-15V
n
c)
Q3
collector -14V
»
d) R4, R5
-0.5V
it
e) R8, R9
-1.2V
ref. to
+
Railvoltage.
f) R14, R15
-0.5V
ii
g)
R16, R17
+0.5V
ref. to
-
Railvoltage.
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