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Service Notes
This check list assumes that the associated equipment (CTV and Video Recorder) are operating correctly on AV and HF
reception.
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.
1. Supply voltage for the Out - Door Unit (Down Converter) in the Paropolic Dish.
Preparation:
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a) Depress SHF switch to " 15 V" position ( (33) from Operation Manual)
- BNC sockets X and Y = 15 V
- BNC sockets X and Y = 150mA (measure in series with the antenna cable - Ipyic X, Y to each SHF Convertor).
b) Release SHF switch to" 0" position
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- No DC voltage.
2. External switching supplies.
This is necessary when tow Parapolic Dishes are connected to the Receiver.
Preparation:
:
Select the required antenna and polarity with switch
Q'°{35( No. (3) in the Operating Instruction).
OV = Dish 1, horizontal, Display indication"0"
°H1"
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3V = Dish 1, vertical,
Display indication"1"
"H1"
6V = Dish 2, horizontal, Display indication"2"
"H2"
9V = Dish 2, vertical,
Display indication"3"
"H2"
3. Output signals loaded with 75 Ohms
a) Euro - AV Video socket ( No.
in the Operating Intructions).
Contact 19 Video signals SANS Vp
Contact 1/3 Audio signal - between 100mV- 500mV depending upon the modulation of the transmission being received.
b) Euro - AV TV socket (No. (22) in the Operating Instructions).
Contact 19 Video signal - sf Y/ 1 Vop
Contact 1/3 Audio signal - between 100mV - 500mV depending upon the modulation of the transmission being received.
c) DIN AV socket (No. (1) in the operating Instructions).
—
Contact 2 Video signal - SM/
1Vpp
Contact 4/6 Audio signal - between 100mV - 500mV depending upon the modulation of the transmision being received.
- Le sti io and the EURO - AV TV sockets are wired in parallel. Therefore only one socket should
loaded.
4. Measurements within the SAT Receiver.
a) In Power Supply stage : refer to over voltages and DC voltage levels given in the circuit diagram.
b) Service checks in the I2C Bus.
The I¢C
Bus should be checked as in Table 1 only when
- the antenna installation
- the peripheral units
- and the Power Supply stage
are all working correctly.
Table 1
emesis | ense [anew
a
The data must be present on the I2c
Bus even then there is no input form
the T.P. or keyboard. If the data is
missing, disconnect the SDA and SCL
lines remove plug 1 - 10). If data re
ars,
the fault is do to an overload on the I<C
Bus.
Possible cause:
SAT. Tuner (Store or Pll).
Pin 25, 26, 1C100
25
Table 2
Possible faults in the complete set.
Button sticking
10 ms pulse
IC 100
(normally 50 ps)
Pin 9, 10 or 11
T 107 short circuit
Q 116
Pin 9, 10 or 11
IR - pre - amplifier
IC 100 Pin 24
No Channel and Pro-
gramme switching
from T. P.
IC 1211 Pin3
IC 1300 Pin 16
IC 1301 Pin 16
Short circuit on or break
IC 100 Pin 37, 38, 39;
in the CLOCK DATA and
IC 1300 and IC 1301
ENABLE lines
Pin 19, 20, 21
IC 1300, IC 1301
_ Incorrect Display
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|
IC 1300, IC 1301
3V-LED on
defective
3,5V-LED off
Pin 1 - 6, 23,24
No CCVS/Sound -
IF-sigph
ir
OOO
No or incorrect display
C 1302 short circuit
(Programme switching
possible)
IC 100 Pin 21
Voltages applied to the microcomputer IC 100 on switching on - preprogrammed at the factory to PROGRAMME 1 (RAI)
Pin
Level
Function
1
V
2
|
High
Reset
3
High
| - Bus Clock
4/7
5V
Vec
5
2Vss
4MHz Clock
6
3,5Vss
4MHz Clock
9,10,11
50sec Impulse
Key scanning
|
12
High
Audio switch over "t1","d2"
("t2" = Low; "t3" =High; "d1" =Low)
13
High
Audio switch over "t1","d2"
( "t2" = Low; "t3"= Low; "d1"= Low)
14
Sound PLL enable
15
Sound PLL Clock
'
en
d a s
16
Low
W/N
"Chytuty
( wyclyty
= High )
17, 18, 19, 20
Low
21
High
AFC
22
High
AFC
23
Low
| - Bus data
24
High
IR -
input
25
SDA I€C
- Bus
26
SCL I€C - Bus
27
Low
Video polarity "hi"
"h-1" = High; "h-2" = High; "h2" =Low;
28
High
Muting
30
Low
Deviation "h1"
"h2" = High
31
_ High
On Stand by = Low
32
High
Aerial "H1"
33, 34, 35, 36,
Key scanning
37
Display Clock
38
Common data (display, fine tuning, sound PLL)
39
Display enable
40
Fine tuning enable
26
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