ARTEMIS

DIGITAL+ANALOG SATELLITE RECEIVER

SERVICE MANUAL

DO NOT CHANGE ANY MODULE UNLESS THE SET IS PLUGGED OFF.

ARTEMIS operates with 170-250VAC main supply and this voltage level has THE RISK OF ELECTRICAL SHOCK.

SCART CONNECTION

20 18 16 14 12 10 8 6 4 2

19 17 15 13 11 9 7 5 3 1

SCART (TV, VCR, DECODER)

Pin Signal

Audio output B

Audio input B

Audio output A

Audio common return

BLUE return

Audio input A

BLUE

Function switching(Slow switching)

GREEN return

GREEN

RED return

Blanking return

RED

Blanking(Rapid switching)

Video output return

Video input return

Video output

Video input

Common return

Video output : Composite video signal; 1 Vp-p3dB/75 W

Video input  : Composite video signal; 1 Vp-p3dB/75 W(for VCR&DEC.)

Audio output  : 0.5 Vrms / Z = 1kW

Audio input  : 0.5 Vrms / Z = 1kW (for VCR&DEC.)

Function switching  : 12V / 6V for 4:3 / 16:9 / Z = 10kW

SERIAL (RS232)

Pin  Signal

1. DCD (Data carrier detect)

RXD (Receive data)

TXD (Transmit data)

DTR (Data terminal ready)

GND (Signal ground)

DSR (Data set ready)

RTS (Ready to set)

CTS (Clear to set)

RI (Ring indicator)

INTRODUCTION:

DVB-S Artemis (analog & digital satellite receiver) is designed with ST chipset. The technical information of the receiver will be explained as three parts in the following pages: Power Board, Main Board and Front Panel Board.

POWER BOARD:

The VIPER concept is used for power supply. Viper50 (IC100) is designed to work until 50 Watts in family of Viper with 5 pins. The receiver works between 170 and 250 VAC mains voltage by using Viper50 in SMPS (Switch Mode Power Supply). The secondary voltage regulation is adjusted by changing the duty cycle of drain signal according to the feedback voltage, which is got from the secondary side of transformer. The feedback voltage is 5V. This is connected to the comparator pin of Viper50 (IC100-pin5) via IC101 (Optocoupler). The comparator pin also protects the box against short circuits and overload. The Vcc voltage of IC100 is between 9-12V at pin2. The Viper50 works at a fixed frequency. This frequency is fixed by RC oscillator at pin1. The pin4 is ground and the pin3 is drain of MOSFET, which is inside the Viper50.

The switching of LNB supply voltage is done here. 18V and 22V outputs of transformer switched by Q100, Q101, Q102 and H/V output of STV0199 (ICL1). By this way overheating and unnecessary power consumption of ICL5 (LM317) that regulates the LNB supply is prevented.

MAIN BOARD:

The main board contains two parts: Front-end and Back-end. The digital signal is demodulated in Front-end and then decoded in Back-end. Analog signals are processed in different part.

The tuner is capable of getting both digital and analog broadcasts. After the modulated signals (I, Q outputs) exit from tuner, they go to STV0199 (ICL1) for demodulation process. In this IC, QPSK (Quadrated Phase Shift Keying) demodulation and Forward Error Correction (FEC) are done which is necessary to demodulate DVB-S transmission. TS (transport stream): The multiplexed digital stream which includes video, audio and data information related to more than one channel (can be only one channel for SCPC signals) and DVB tables. TS signals which are generated after demodulation, reach to ST20 (ICS1) via 8 bits data bus. However, Byte Clock, Packet Clock and Error signals are also sent to ST20 (ICS1) for demultiplexing process of TS. ICL1 (STV0199) is controlled by IIC. In addition, 22kHz tone which is needed for DiSEqC signals, is generated at pin16 of ICL1 (STV0199).

LNB supply voltage (13/18V) is regulated via LM317 (ICL5). Switching of supply voltage between LNB1 and LNB2 is done by QL77, QL79 transistors. 22kHz signal which is generated by STV0199 (ICL1), is added to LNB supply here. The voltage on RL83 is proportional with the current of LNB supply. Overload on LNB supply increases the voltage on RL83, which results switching of QL74, QL73. By this way input port of STV0199 (ICL1) has the knowledge of LNB overload and then LNB supply is cut off for protection of box via IIC.

STV0199 (ICL1) generates an AGC value according to the amplitude of I, Q signals that are coming from tuner and then a generated AGC level is sent to tuner again. This provides I, Q signals to remain at constant amplitude.

At the backend part, there is a 32-bit CPU (ST20-ICS1) that controls all processes. Demultiplexer of the CPU provides the transmission of the desired channels information from TS (Transport Stream) to MPEG Decoder IC (Sti3520 ICS1). The program that runs on ST20 is in Flash memories (ICSM1, ICSM2). 8Mbits DRAMs (ICSM3, ICSM4) are used for data memory of this program.

ST20 (ICS1) uses 32- bit data and 20- bit address buses for access to flash, DRAM and Sti3520. It uses RAS, CAS etc. (read, write, enable) signals to activate related IC while accessing them.

The clock which is needed by ST20 (ICS1 is generated at power on mode by 27MHz crystal (XS1) and ICS3 (74HCU04). The same clock is used by Sti3520 (ICS1) and STV0118 (ICV2) at the same time. The output of PWM outputs of ST20 (ICS1) is filtered to have a DC level via RS51 and CS25. At the output of ICS2, the 27MHz clock can be adjusted according to capacity of pins of 27MHz crystal to ground. This capacity is related with DC value on DS1 and DS2 (BB909) at pins of crystal. This operation maintains synchronization between audio-video that are coming from MPEG transport stream and PCR clock.

ST20 (ICS1) can communicate any micro controller via RS232 by using ICS4 (MAX232- RS232 level converter). The RS232 output of receiver is used for debug any problem using Windows Hyper Terminal program.

Sti3520 (ICM1) is responsible for decoding of MPEG video and audio signals. The video, which is compressed using MPEG2 and audio, which is compressed using MPEG1 Layer 1-2, are processed here. Sti3520 (ICV2) uses 4 pcs. DRAM (ICD1, ICD2, ICD3, ICD4) for this operation via 64 bits data and 9 bits address buses. After decoding, CCIR 601 formatted 8-bit video and PCM formatted audio, are generated by Sti3520 (ICM1).

STV0118 (ICV2) converts digital video that is generated by Sti3520 (ICM1) to RGB and CVBS analog video. If digital broadcast has a teletext information, STV0118 (ICV2) inserts teletext info into VBI (vertical blanking interval) which can be watched on TV. Digital audio that is PCM formatted on Sti3520 s output, is processed by TDA1311 (ICA2) and amplified by LM833 (ICA1) and then switched through ICN2 (74HC4052) and finally reaching STV0056 (ICN1).

This box has also stereo analog satellite receiver property realized using STV0056 (ICN1). All of the analog processes are done by STV0056 (ICN2). The base band signal coming out of the tuner (RL9 is filtered before entering STV0056 (ICN2). Analog video output is on pin64 of STV0056 (ICN2). STV5730 (ICN3) is used for realizing analog signal stability and insertion of analog OSD (On Screen Display) characters to video. The analog video is driven through scart outputs using QN1 after it leaves from pin27 of STV5730 (ICN3). Separately from Sti3520, STV5730 (ICN3) is used for analog OSD since the CVBS output of STV0056 (ICN2) is not synchronize with digital OSD of Sti3520. The audio of analog broadcasts is also demodulated in STV0056 (ICN2) and directed from pin3 (VOL_L) and pin62 (VOL_R) to scart audio outputs. 50mS (inside IC), 75mS (RN44, CN42) and J17 (RN40, CN45, CN44, RN39) are used for de-emphasizing of analog audio. Volume control is done by STV0056 (ICN2) for both digital and analog mode.

In digital mode, RGB signals are only delivered to TV scart. CVBS output is distributed through STV0056 (ICN2) to TV, VCR and DECODER scarts.

Crypted analog channels can be watched by DECODER connection. When DECODER becomes active, audio and video signals are driven to TV and VCR scarts, which is activated by pin8 of DECODER scart.

The program information is stored in 64Kbits EEPROM (24C64 ICSM5) via I2C.

FRONT PANEL BOARD:

To show program number, 4 digit 7 segment displays (MD1001, MD1002) are used on front panel board. They are driven by SAA1064 (IC1000) which is controlled by IIC. The functional keys are Standby, TV/Radio, Menu, OK, Vol+, Vol-, Prog+, Prog-. IR module (MD1000) is used for remote control. Standby/power on led is used to indicate whether the box is in Standby or Power on mode with Red (Standby) and Green (Power on). Lock led is used to show signal lock for digital transponders.

IC LIST

ST20-TP2 (ICS1) Programmable Transport IC for DVB Applications.

Sti3520A (ICM1) MPEG Audio/MPEG-2 Video Integrated Decoder

STV0199A (ICL1) QPSK/BPSK Link IC

STV0118 (ICV2) PAL/NTSC Digital Encoder

STV5730 (ICN3) Multi-standard OSD (On-Screen-Display) IC

TDA1311A (ICA2) Stereo Continuous Calibration DAC

M29F400T (ICSM1, ICSM2) Single Supply Flash Memory

KM416C256D (ICSM3, ICSM4, ICD1, ICD2, ICD3, ICD4) 256 x 16 bit CMOS Dynamic RAM

24C65 (ICSM5) 64Kbit Serial EEPROM

STV0056AF (ICN1) Satellite Sound and Video Processor

TSH22 (ICS2) Dual Bipolar Operational Amplifier

M74HCU04 (ICS3) Hex Inverter

M74HC4052 (ICN2) Analog Multiplexer/Demultiplexer

MAX232 (ICS4) RS232 Driver/Receiver

LM833 (ICA1) Low Noise Dual Operational Amplifier

SAA1064 (IC1000) 4-Digit LED driver

M3004 (IC101) Remote Control Transmitter

Viper50 (IC100) SMPS primary IC

LM3940 (IC103) Low Dropout Voltage Regulator

LM317 (ICL5) Voltage Regulator (for LNB supply)

LM7812 (IC102) Voltage Regulator

SERVICE MENU INTERFACE

There is a service menu for service person which is accessed by pressing 1, 9, 1, 9 keys on the remote control respectively while Main Menu is on. This menu consists of five active lines and one line which states software version and build date.

RF Mod. Type : You can control RF modulator option at this line. RF modulator option can be selected as none or Alps type or Samsung type in software side by pressing left or right cursor key on the remote control.

Front Panel Test : You press OK button on the front panel to enter front panel test then you can see name of the button on the front panel you pressed. By pressing Menu button on the front panel two times, you can exit.

Remote Commander Test : You press OK button on the remote commander to enter remote commander test then you can see name of the button on the remote commander you pressed. By pressing Menu button on the remote commander two times, you can exit.

7-Segment Test : You press the OK key on the remote commander to start 7-segment display test. You can see the test pattern on the display.

Factory Settings : You press OK key on the remote control to start factory settings. These settings reinitialize whole EEPROM and store all programs of preset transponders

You can return to main menu by pressing keys on the remote control respectively again.

IC DATA SHEETS

ST20-TP2

STi3520A

STV0199A

STV0118

STV5730

M29F400T / M29F400B

4 Mb (x8/x16, Block Erase)

SINGLE SUPPLY FLASH MEMORY

M24C32

M24C64

64K/32K SERIAL I 2 C BUS EEPROM

STV0056AF

TSH22

M54HCU04

M74HCU04

HEX INVERTER (SINGLE STAGE)

74HC4051/52/53

ANALOG MULTIPLEXER/DEMULTIPLEXER

SINGLE 8 CHANNEL, DUAL 4 CHANNEL, TRIPLE 2 CHANNEL

LM833

LOW NOISE DUAL OPERATIONAL AMPLIFIERS

M3004LAB1

M3004LD

REMOTE CONTROL TRANSMITTER

VIPer50/SP

VIPer50A/ASP

LM117/217

LM317

1.2V TO 37V VOLTAGE REGULATOR

TROUBLE SHOOTING GUIDE

DO NOT CHANGE ANY MODULE UNLESS THE SET IS PLUGGED OFF.

ARTEMIS operates with 170-250VAC main supply and this voltage level has THE RISK OF ELECTRICAL SHOCK.

RECEIVER DOES NOT WORK (OR CAN NOT SEE ANYTHING ON FRONT PANEL):

heck mains voltage and fuse (F1). If they are OK, check supply voltages (3.3V, 5V, 12V etc.) on power board. Check short circuit on power board. Check reset circuit (QL80, QL81) and clock circuitries on main board (especially 27MHz clock). Check short circuit on main board also especially on data and address busses.

RECEIVER CAN NOT TUNE ANY DIGITAL OR ANALOG TRANSPONDER:

Check LNB supplies for LNB input (DL4 for LNB1, DL71 for LNB2) and tuning voltage of tuner (30V) on D63. If there is no supply, check LM317 (ICL5) circuit and check the switching circuit (Q100, Q101, Q102) on power board for LNB supply.

If the receiver can only tune analog transponders (or only tune digital transponders), check 5V switching circuit (QY2, QY3, QRY1 and QRY2) of tuner. Please check Base Band Video output of tuner on emitter of QL1 for analog channels. If you could not see Base Band video signal, there can be malfunction on IIC bus or tuner is not functioning else check this signal on input pin (pin16) of STV0056 (ICN1). Please check video output (pin64) of STV0056 (ICN1) and pin27 of STV5730 (ICN3). Be sure that video buffers (QN100, QN1) are OK. If you could not see video signal on pin64 of STV0056 (ICN1), please check the suppliers (12VV on CN11, 12VA on CN10, 5VD on CN6) of STV0056 (ICN1).

NO DIGITAL VIDEO SIGNAL ON TV SCART WHEN LOCK LED IS ON:

First of all, be sure that the channel is not scrambled and check CVBS signal using VCR/DECODER scart output. If you get CVBS, probably there are no RGB outputs, check the RGB buffers (QV11, QV12, QV13), switching transistors of Fast Blank (QN90, QN91) and then check RGB outputs on STV0118 (ICV2). If you could not get any video signal from scart outputs, please check CVBS and RGB outputs on STV0118 (ICV2). Please, follow comments about STV0056 (ICN1) above mentioned when you see CVBS signal only on STV0118 (ICV2) output.

NO SOUND ON DIGITAL CHANNELS:

Please check audio L, R inputs (CN66, CN65) of STV0056 (ICN1) and then check pin11 (D_LOUT) and pin4 (D_ROUT) of ICN2 (74HC4052) when you could not see any audio on STV0056 (ICN1) inputs. Finally, check audio outputs of TDA1311 (ICA2).

NO SOUND ON ANALOG CHANNELS:

First, you should check again audio outputs (CN17, CN18) of STV0056 (ICN1). If they are not OK, check supplies (12VV on CN11, 12VA on CN10, 5VD on CN6) of STV0056 (ICN1) and then check de-emphasis circuits (CN42, RN44, CN32, RN29 for 75ms and RN40, CN45, CN44, RN39, RN30, CN36, CN35, RN31 for J17) and measure VREF voltage as 2.4V on CN39. Check the filter circuit (CN2, RN3, RN1, LN1, CN5, and CN3) on base band audio input before STV0056 (ICN1).

NO RF SIGNAL ON RF MODULATOR OUTPUT:

Check Modulator using test pattern signal (press Prog+ & OK buttons at the same time on front panel). If it is OK, check the video signal on RN7 else check QN1.

BAD DECODING ON DIGITAL TRANSPONDERS:

Be sure that Symbol Rate and Frequency of transponder are true. The signal quality and antenna position are very important. Also be sure that you can see the digital OSD properly, if not check any short circuit on DRAMs (ICD1, ICD2, ICD3, ICD4) and Sti3520 (ICM1) address and data buses.

BAD OSD IN ANALOG MODE:

Change 17.734MHz crystal (XN100) or check CN107, CN108 and supply voltages of STV5730 (ICN3).

BAD OSD ON DIGITAL MODE:

Check the RGB buffers (QV11, QV12, QV13), switching transistors of Fast Blank (QN90, QN91) and then check RGB outputs on STV0118 (ICV2). Be sure that there is no any soldering problem on STV0118 (ICV2) and on YUV buses of Sti3520 (ICM1).

NO SOUND FROM VCR SCART:

Please check audio inputs of VCR scart on CN60 (VCR_LIN), CN63 (VCR_RIN).

NO SOUND ON AN ANALOG ENCRYPTED CHANNEL:

Be sure that the frequency and audio settings (de-emhpasis and bandwidth selection) are correct. Check audio outputs (CN61 for R, CN64 for L) of STV0056 (ICN1) for DECODER and then check switching of DECODER audio inputs on ICN2 pins. If you see decoded audio inputs on pins (CN65, CN66) of STV0056 (ICN1), please check audio circuits of STV0056 (ICN1).

NO DiSEqC SWITCHING FUNCTIONALITY:

Check 22kHz signal output (RN94) of STV0188 (ICL1) and then check pin3 of LM317 (ICL5). If it is not OK, change LM317 (ICL5) or external components.

RS232 CONNECTION:

To find any hardware problem on board quickly, use RS232 connection of box and your PC with Windows Hyper Terminal program. You can see any Error Messages by this way on your PC (RS232 settings: Bits per sec = 9600, Data bits = 8, Parity = None, Stop bits = 1, Flow Control = None).