AMSTRAD SRX345 User manual

Please note: when any work is carried out on aset, the following safety must be carried out to ensure continued
electrical safety.
1) Flash Test:
Test at 4kV between the live and neutral of the mains lead joined together and ALL accessible metal points on the
exterior of the set.
2) Insulation Resistance Test:
Test between the live and neutral of the mains lead joined together and ALL accessible metal points on the extericr
of the set to show resistance of at least 4M ohm.
Contents
Contents, Tech. Specs., Safety
Alignment Instructions
Cabinet Exploded Diagram &Parts List
Electrical Parts List
P.S.U. &Front Panel PCB Component Layout
Main PCB Component Layout
Schematic Diagram P.S.U. Main
Schematic Diagram P.S.U. LNB
Schematic Diagram Front PCB
Schematic Diagram Main Video,
Audio &Microprocessor.
Schematic Diagram Main Output Switching
Multilingual Tech. Specs.
Engineering Notes &Voltage Charts
Page! SPECIFICATION U
2RECEIVER
3-4
5Dimensions, weight: 335 x250 x62mm, 1.9kg
Mains supply: 220- 230V ac 50Hz
6-8 Tuning range: 700-2050MHz
8Channel bandwidth: 27MHz
Local oscillator range: 0and 9.3- 12GHz
9Fine tuning range: ±1 0MHz
10 Dynamic range: -20 to -60dBm
AM co-channel interference threshold: -!5dBc typical
11 Threshold: 8dB C/N (with threshold extension
12 RF output: Channel 38 (adjustable 30-40)
Audio subcarrier: 5.5-8.5MHz
13 Audio output level: 2V pk-pk at 50kHz input deviation
Audio response: 40Hz- 15kHz
Input/output connectors: LNB 75 ohms F-type
14 RF 75 ohms coaxial (x2)
15-19 AUDIO OUT RCA phono (x2)
SCART/PER1TEL 21 -way
20 DECODER 21-way
Date of First Publication April 1994.
Information published was latest available at the time of print.
Amstrad reserves the right to supply selective components.
BACK PANEL SOCKETS
Input frequency range:
Output frequency range:
Local oscillator:
Gain:
.Noise figure:
Polarisation switching:
Output connector:
1070-1 1.80GHz
950- 2050MHz
9.75GHz
55dB
IdB typical
Electrical (I3/I7V)
75 ohms F-type
In keeping with our policy of continually improving our service and the technical quality of our products, we reserve thr right to change component type,
manufacturers,sources of supply or technical specifications at any time.
Amstrad Pic.
BRENTWOOD HOUSE, 169 KINGS ROAD. BRENTWOOD ESSEX CM14 4EF
TV SCARTIPERITEL
1Audio out R
2Audio in R
3Audio out L
4Audio ground
5Blue ground
6Audio in L
7Blue*
8External switching
9Green ground
10 Serial interface (data) t
11Green*
21 19 17 15 13 11 9753 1
DECODER
12 Serial interface (clock) t
13 Red ground
14 Serial interface ground t
15 Red*
16 Blanking*
17 Video ground
18 Blanking ground
19 Video out
20 Video in
21 Shield/ground
1Audio out R
2Audio in R
3Audio out L
4Audio ground
5Ground
6Audio in L
7(not used)
8Audio/video INT/EXT
9Ground
10 PAL baseband out
(unfiltered/undamped) *(not implemented)
t(dealer use only)
1 1 Green
12 MAC baseband out
13Ground
14 (not used)
15 (not used)
16 (not used)
17Video ground
18 (not used)
19 PAL baseband out
(filtered/damped)
20 Video in
21 Shield/ground
2

Electrical Parts List
PtNo
Description
ICs
IC MC14053BCP
ICTDA61602X
IC LM1894N
IC 2406 EEPROM
IC 68HC05D24 CPU V3.I0
IC 78L05AC Regulator
IC UPD6450CX-002
ICLM392 _
IC !SlU60LIr Sensor
IC CS3842A
IC CNY17F-3X PCI11L Opto
C'pler
IC TL431CLP Shunt Regulator
10,10
IC2
ficlli
'rnmm
IC5
ic6
;
IC8
IC300
IC500
IC600
IC601
242222
242315
250009
241531
241544
241529
241537
241539
241538
IC602
JC -Transistors
TR43 Tr DTC124ES
TR2,4,7,8,10 Tr 2SC1740S 2SC945X
1144,15,17
19-22,26,29
31,32,34,37
38,40-42
300,302
TR44 Tr DTA114E
TR1,3,5,6,12 Tr 2SA933S 2SA733K
27,28;30,33
36,301
TR600 TrMJF18004
TR304 Tr 2SD313D
TR303 Tr 2SB1143T
152050
50016
273263
150874
240737
50005
240037
Diodes
D1N4148 270754 Dl-6,603-
605
D1
D7
D8 /if- -
D600
D303
D602,606
Ip7,608
D601
D4
D501
D500
241430
240377
241233
241403
241406
241633
240733
241402
240815
241631
241632
DBB609
DZ BZX55C 6.V8 500mW
DZ 27V 500mW
DDF10M Bridge
DFE1A
DRGP10D
DRL2Z
DIN4005
DZ5.1V 500mW
LED Red SLP030RA
LED Green SLP030GA
Ref No Description
Coils
Coil lOpH
Coil lOOpH 1404AE
Coil lOOpH 1041D
Coil lOOpH Choke 10457
Coil 1.2pH
Coil 1.8pH
Coil 18pH
Coil 3.3pH
Coil 33pH
Coil 33pH Choke
Coil3.9pH '
Coil 8.2pH
Coil 330pH Toroidal
Tx pains Switching LLP007TH
Line Filter 39pH Toroidal
PLNo
L8
LI,13
L12.13
L16
L7
L10
L9
L3
Lll
L601.602
L2
L4,5,14
L300
T600 A
L600 A
241636
242224
241637
Miscellaneoms
Scart Socket
Remote Control Handset
CATV Cable 3C-2W
Carton
Polypacking
User Instructions
Tact Switch
Tuner Assy 1500-P2
Shield Metal IR Sensor
Fpse 1.25A(T)
VRSF 10K Cl linear
VRSF 500 Q50100 PSU
Trimmer Cap 40pF
Crystal 17.73447MHz
Crystal 4.0MHz
RF Modulator CH30-40 5V
Ceramic Discri.
CDA10.52MG38V
Cer. Filter SFE10.52MJA10-A
Ceramic Discri.
CDA10.7HG38V
Ceramic Filter SFE10.7MJA10-A
Phono Jack Red White
Slide Switch
153030
241568
153048
242309
241629
242310
240860
242177
FS600
A
VR1
VR1
C91
XL11
240083
240710
241638
24
241640
254427
242178
240077
241028
240076
241027
240798
240)800

ALIGNMENT INSTRUCTIONS
NOTE:
Electrical adjustment is required after replacing certain components and certain mechanical parts, It is important to
perform these adjustments only after all repairs and replacements have been completed. Also, do not attempt these
adjustments unless the proper equipment is available.
NOTE: This flow chart indicates, the electrical adjustment step.
TEST EQUIPMENT REQUIRED
1. Oscilloscope: Dual-trace with 10:1 probe,
V-RanQe: 0.001 -50v/Djv.,
F-Ranoe: AC-DC-20MH7
2. PAL Pattern Generator
(Color bar with 100% white)
3. AC Voltmeter (RMS)
i.LNB Voltage Adjustment
Purpose:
To separate receiving signal into horizontal and vertical polarisation.
Symptom of Mtsadjustment:
Receiving signal is not separated into horizontal and vertical correctly.
Test Point Adj. Point Mode Input
LNB Voltage
LNB: 450mA Load
LNB Polarity: H(+17V)
RV1 ;
(PSU PCB) ——
Tape M. EQ. Spec.
—Voltage Meter H: 17.2-18.0V<V: 12.8- 14.0V)
Connections of M. EQ.
Reference Notes:
1.Check that LNB Polarity is “H” on the step 1(Vp-p Voltage Adjustment).
2. Connect equipment as shown in the above table.
3. Adjust RV1 to obtain 17.6V LNB Voltage.

2.Video Level Adjustment
Purpose:
Adjust Contrast level of video signal at TV Scart/Modulator output.
Symptom of Mlsadjustment:
Display will be too dark or too bright.
Test Point Adi. Point Mode Input
SK2 Pin 19
LNB: 450mA Load
LNB Polarity: H(+17V)
RV1
(Main PCB) -CH8: 1317.5MHz, White
100%, RF= -45dBm, C/N= Max
Tape M. EQ Spec
Wave Monitor Video Level: 1Vp-p±0.5Vp-p
fConnections of MEQ.
Wave Monitor
BS Tuner Set
Figure
;1i
1Vp-p
T
Reference Notes:
1. Input CH8: 1317.5MHz, White 100%. RF= -45dBm, C/N =Max.
2. Connect the signal from SK2 Pin 19to Wave Monitor.
3. Adjust RV1 (Main PCB) to obtain 1Vp-p.
3. OSD Freq. Adjustment
Purpose:
To adjust frequency of OSD (On Screen Display) control signal.
Symptom of Mlsadjustment:
OSD may be not distinct or colour background may be grey.
Reference Notes:
1.Push ‘TIMER” key on the Remote Control to place units in TIMER mode.
2. Connect equipment as shown in the above table.
3. Adjust C91 to obtain 17.734475MHz.
5. Clamp Level Adjustment {with 450mA LNB load)
Adjust RV3 to achieve 1.85V at the Jn. of RV3 &R5.
Note: This allows maximisation of video ADC input.

MmDescription
47k Q
100k Q
100k Ql/2w
150k Q
180k Q
220 kQ
470k Q
820k Ql/2w
1MQ
WireWound
Capacitors
4.7pF
15pF
22pF
33pF
47pF
56pF
82pF
lOOpF
150pF
200pF
270pF
330pF
330pF IkV
lOOpF
O.QOlpF
0.001 pF!
0.0033pF
0.0047pF
0.01 pF
0047pF
0.1 pF
241381
Cl-3,25,34,98, 110,613
C602»603,608
C27,27,60
C104
C9,30,33,35,38,616
C20
C2,12;16,26,39,40,41,56,57,82,85
87,89,100,107,306
Electrolytic
C31,43,1 02,
lOpF 16V np
lOpF 35V
68|iF 400V
lOOuF 10V
lOOuF 16V
PtNo.
Ref. No.
Resistors l/6w
Unless stated differently
R308
R610
R609
R32
R1 10,1 15
R54-56.84.129
R35,36,59,60,73,76,1 16,120,121
0.91 nl/2w
2.2 Ql/2w
4.7 Ql/2w
27Q1/4W
75 n
75 Ql/4w
ioo n
R617
R607
RIO
R8,14,1 5,106,1 11,173
R176
R3,47,48,50,309,608
R71
R157,158,203,204
R93,162
R49
R3940
Rl,7,9,51,65,67,103,108,1 13,118
130,144,618
R34,37
R72,200,201
R70
R29.30
R7,81 1,12,21,22,31,57,58,62,63,
87,88,124-126,133,137,611,616
R622
R620A.621A
R26
R310
R16
R107.112
Rl,82,142,320
R23,24,86, 117,148, 149,154,155
319
iooni/4w
100 Ql/2w
120 n
1500
180 n
220 n
2400
270 0
330 0
3900
430 O
4700
560 0
750 0
820 0
9100
IkO
R74
R66
R2,4,5, 17, IS,43,68,69,79,80, 104
105,300,305,306,312,318,614,615
624
R38,89,90
R2,77,83,109,1 14,119,141,171
R52.131
R613
R621A
15k O
22k O
27k O
27k 01%
33k Ol/4w

Description Ref. No,
lOOpF 25V C612
100pF 50V C302
330pF 16V C622
330iiF 35V C621
330pF 50V C620
470jiF6.3V C46
470pF 10V C623
470pF 16V C305
..
3*t00-7^2P-3 DISPLAY PC8
PSP0397I
Polyester
0.22pF63V
0.22uE250V
IARNING LI
RVfcOO
Meta] Film .
C601
C600

Schematic
Diagram
P.S.U.
Main
10
WRITTEN
PERMISSION

Schematic
Diagram
P.S.U.
LNB

Schematic
Diagram
Front
PCB
H
0
H
O
o
M
H
<
W
0
H
Q
I
M
W
H
0
Z
H
6<? h
ofi H
03 ob
rl
-H
>0
>MZ
in h
++*
hcm <n
o
w
a! D
0M
0) H
>
m
m+
CM
H
>
O
<
H
<
Q
Zb
00

Schematic Diagram Main, Video, Audio &Microprocessor
SFEiO .7MUA10-A XL
3
SFE10 .52MUA10-A XL4
SFEIO .7HA 19XL5
«« DENOTES MODEL DEPENDENT
VALUES AS LISTED BELOW
REF SRX340/3S0
SRD650 SRD540/550
R1470 IK
R2 22K 4K7
R4 10K iK5
R7 470 470
R50 220 390
R159 470K 470K
ALL INFORMATION CONTAINED ON
THIS DRAWING IS COPYRIGHT OF
AMSTRAD pic .
LEGAL ACTION WILL BE TAKEN
AGAINST ANY COMPANY USING OR
COPYING THE DESIGN/IDEAS OR
INFORMATION CONTAINED ON
THIS DRAWING WITHOUT PRIOR
WRITTEN PERMISSION. 13

Schematic Diagram Main Output Switching
PHONO SOCKETS
AUDIO OUT
THAT
&SRD550
S£aRT details 1
PIN FUNCTION
3AUDIO OUT A~
1AUDIO OUT B
6AUDIO INPUT A
2AUDIO INPUT B
4AUDIO COMMON RE
19 VIDEO OUT
20 VIDEO IN
17 VIDEO RETURN
15 RED
13 RED RETURN
11GREEN
9GREEN RETURN
7BLUE
5BLUE RETURN
8SWITCH
16 BLANK
18 BLANK RETURN
12 DATA 1
10 DATA 2
14 DATA RETURN
21 COMMON RETURN
** DENOTES MODEL
VALUES AS JELOW
mSRX340/50
SRD650/E SRD540/50
C106 I50o 82p
R106 150 55 120 5.«
R1073k 55 !2k 5X
R1 10 75 55 47 5%
Rill 150 55 120 5*
R1 12 3k 55 2k 75*
R1 15 75 55 68 5*
R1 16 100 55 27 5*
L17NF 8U2
C86 jNF 33P
ALL REFEREIICE^ TO
PL803 &PL506 ARE FOR
SRD650/E MkC f^CB
SHT #1
14
ALL INFORMATION CONTAINED ON
THIS DRAWING IS COPYRIGHT OF
AMSTRAD pic.
LEGAL ACTION WILL BE TAKEN
AGAINST ANY COMPANY USING OR
COPYING THE DESIGN/IDEAS OR
INFORMATION CONTAINED ON
THIS DRAWING WITHOUT PRIOR
WRITTEN PERMISSION.

SWITCH
IMe
AUDIO OUTPUT
AUDIO INPUT
AUDIO OUTPUT
AUDIO 8ND
BLUE SND
AUDIO INPUT
BLUE
SW .VOLTAGE OUT
GREEN GND
DATA LINE 2
BREEN
DATA LINE 1
RED GRAND
DATA GND
RED
BLANKING SIGNAL
VIDEO GND
BLANKING SIGNAL
VIDEO OUTPUT SND
VIDEO INPUT
SHIELD/GND
15

Test Waveforms
Fig. 1. TP Junction of RV lSc R19
Video Baseband
Fig 2TP TR6 Collector
De Emphasis Video
Fig. 7TP D6 5.5Vp-p
VSynch (OSD)
Fig. 3TP TRIO Collector
Sub Carrier Filter
Fig 4TP J-n of C11&R167 16Vp-p
Clamped (Ed Removed)
Fig IOTP Jn R29& 1C 2Pin 14
Audio (Left)
Fig. 5TP TV Scart Pin 19 lVp-p
Video Out
Fig. 6TPD5 5.5Vp-p
HSynch (OSD)
Fig. 11TP Jn R29 &C22
Audio (Left)
16

VOLTAGE CHARTS
IC300 LM392
PIN 124.96V
24.54V
37.07V
40.021V
55.29V
65.30V
715.31V
826.33V
IC500
PIN 1
7
_3
4-6
7
IC501
PIN 1,2
3,5,6
J
2
j
2
10,11,13
J7
14
74LS164
3.96V
4.05V
0.29V
0.28V
0
74LS164
5.07V
4.01V
4.02V
_0
5.07V
5.05V
4.05V
4.06V
5.06V
LM324
_0
6.49V
5.07V
26.5V
0
0.55V
0
IC902
PIN 1,3,4
2,5-8,12
9,11
10
13
14
15
CD4053BE
0.068V
0
4.96V
4.95V
4.98V
4.97V
6V
IC1
PIN 1
2,12,14,15
6-8,10,11
9
3
4,26
5,8,15,16,18,25
6,7,10
9,11
12,13
14,17,19-21
22
2.42V
2.03V
1.72V
1.72
0.46V
2.33V
5.09V
IC2 TDA61602X
PIN 10.41V
22.51V
LM1894N
12.78V
6.3V
6.32V
6.33V
5.39V
0.74V
5.86V
8V

IC4
PIN 1-4,7
5
6
33,40
3,7,9,11,13,14
17,18,20-23
25,26,28,34-36
4
24C16
0
5.
68HC0524 CPU
4.94V
78L05AC
12.77V
0
4.95V
PIN 1,2,8,10,12 5.09V
15,16,24,29-31
IC8 UPD6450CX-002 OSD
PIN 1,3,9 0
24.92V
4,5,10,11 4.92V
62.5V
72.4V _
1
82.36V
12 5.49V
13 5.10V
14 2.29V
15 1.49V
16 2.58V
17 1.74V
18 1.73V
19 5.01V
32 2.98V
37 4.78V
38 2.25V
39 2.27V
MC14053BCP
2.76V
V
3.9V
4.1V
0
0.12V
2.68V
2.94V
3V
12.76V

TRANSISTORS
REF Q/TR cB E
112.31V 4.69V 12.82V
612.01V 8.02V 1.67V
712.02V 2.28V 1.7V
89.43V 2.6V 1.94V
12 7.03V 12.03V12.69V
14 10.37V 0.1V 0
16 0.25V 3.59V 3.55
20 12.07V 2.18V 1.06V
23 4.32V 1.94V 1.34V
24 1.43V12.04V12.68V
26 12.02V 1.04V 0.4V
27 3.2V 1.05V12.68V
28 2.04V 12.04V 12.68V
29 12.05V1.37V 0.79V
30 1.94V12.04V 12.68V
31 12.04V 2.16V 1.57V
33 4.96V 4.24V 5.04V
36 010.27V 5.41V
37 11.96V 00
38 3.74V 0.6V 0
40 3.97V 3.87V 3.23V
42 2.6V 00
280 3.4V 0.04V 0
REF CBE
300 3131V 0.12V 0
301 6.15V 31.32V 31.34V
302 31.32V 15.36V 15.29V
900 00.3V 0.7V
901 12.69V 00.76V
903 6.93V 0.01V 0
904 0.04V 0.22V 0.7V
906 00.7 0.7
907 0.7V 0 0
908 1.0V 4.96V 5V
909 IV 4.96V 5.0
910 IV 4.96 5.01
911 00 0
912 000.6V
913 00 0
914 000
915 0.04V 0.68V 0
916 0.01V 0.04V 0.03V
917 5.06V5.06V 4.38V
918 0.6V 0 0
919 0.01V 00.28V
920 0.03V 00.56V I
NOTE FOR THE ENGINEERS
Please note which type of satellite dish and type of LNB is installed when installing this equipment.
This receiver is factory set for SLB3 or TLB3. To use older type of Amstrad LNB, change receivers local oscillator
setting to 10GHz. To do this press set-up repeatedly so installation menu is displayed on the screen. Press select +to
change LNB setting to 10.000GHz and then exit.
Reset:
To achieve full factory reset
1)
:Set in stand by mode
2)
:Press Ok, Setup and Status buttons in sequence on the handset
3)
:Hold Setup button pressed down until LEDs on the front panel start to flash.
Now the set is in full reset mode.

Deutsch
TECHNISCHE DATEN
EMPFANGER
Abmessungen, Gewichc
Stromversorgung:
Empfangsfrequenzbereich:
Kanalbandbreite:
Oszillatorfrequenzbereich:
Feinabstimmungsbereich:
Dynamikbereich:
Schwellenwert:
AM-Kanalinterferenzschwelle:
RF-Ausgangssignal:
Signal-Rauschabstand S/N:
(bezogen auf Basisbandbreite
5MHz fur PAL bei C/N= !4dB
und nominellen Hub s-s des
Nutzsignals)
Audio- Zwischentrager:
Audio- Ausgangspeget:
Frequenzgang:
Eingangs-/Ausgangsanschlusse:
SLB3 LNB
Eingangsfrequenzbereich:
Ausgangsfrequenzbereich:
Oszillatorfrequenz:
Verstarkung:
RauschmaB:
Trager-Ra'uschabstand C/N:
Polarisations umschaltung:
Ausgangsbuchse:
ANTENNE
Offnungswinkel:
Gewinn G:
bei I1.5GHz
Rauschtemperacur Ta:
‘Clear Sky’ beim 30°
Elevationswinkel
G/T-Wert (dB/K):
(mit o.g.LNB)
335 x62 x250mm (B xHxT). 1,9kg
220-230V/50Hz Wechselstrom
700- 2050MHz
27MHz
0und 9,3- 12GHz
±IOMHz
-20 bis -60dBm
8dB Storspannungsabstand {mit Schwellenwerterweiterung)
-15dBc (typisch)
Kanal 38 (einstellbar von Kanal 30-40)
43,5dB
5,5-8.5MHz
2Vs-s bei 50kHz Hub
40Hz- 15kHz
LNB 75 Ohm Typ F
RF 75 Ohm koaxial (2x)
AUDIO OUT RCA-Phonostecker (2x)
SCART/PERITEL 21-polig
DECODER 2l-polig
10,70-1 1,80GHz
950- 2050MHz
9.75 GHz
55dB
idB typisch
15 dB
elektrisch (1 3/ 17V)
75 Ohm Typ F
SDM60 SDM80
3,0 2.4
36dB 38dB
75K 65 K
14 16.5
BUCHSEN AN DER GERATERUCKSEITE
20 18 16 14 12 10 8 6 42
bBShmSm
21 19 17 15 13 11 97531
TV SCARTIPER/TEL
1Audio-Ausgang rechts 11Grun*
2Audio-Eingang rechts 12 Serielle Schnittstelle (Uhr)
'
3Audio-Ausgang links 13 Rot/Erde
4Audio/Erde 14 Serielle Schnittstelle (Erde)
5Blau/Erde 15 Rot*
6Audio-Eingang links 16 Austastsignal*
7Blau* 17 Video/Erde
8Externe Schaltspannung 18 Austastsignal/Erde
9Grun/Erde 19 Video-Ausgang
10 Serielle Schnittstelle 20 Video-Eingang
(Daten) t21 Abschirmung/Erde
DECODER
1Audio-Ausgang rechts 12 MAC-Grundband-Ausgang
2Audio-Eingang rechts 13 Erde
3Audio-Ausgang links 14 {nicht belegt)
4Audio/Erde 15 (nicht belegt)
5Erde 16 (nicht belegt)
6Audio-Eingang links 17 Video/Erde
7(nicht belegt) 18 (nicht belegt)
8Audio/Video 1NT/EXT 19 PAL-Grundband-Ausgang
9Erde (gefiltert/geklemmt)
10 PAL-Grundband-Ausgang 20 Video-Eingang
1
1
(ungefiltert/ungeklemmt)
Grun
21 Abschirmung/Erde
*(nicht belegt)
t(Verwendung nur durch Fach handler)