Samyung SN-100, Service Manual

-  In  this  case,  the  condition  of  connect  point  of  LCD  connector  or  of  LCD  board  must  be 

defected. The same board & connector should be cleaned with detergent material that is volatile. 

3. NBDP DATA RECEIVING 

①

. Data is not received.

- Firstly, check that ANT is correctly connected.

- Check that +12V is generated on U1 of T-025.

- Check that SRG-1150DN/SRG-1250DN receive W/K S signal. 

If not, check the third pin (IC4 of T-022) is approximately 3.2V (+3.2V is normal). And, check 

1ST, 2ND, BFO are supplied.

- Check that 1.7KHz±85Hz on CN8 of T-022 is generated.

- Check that DOT/PATTERN signal on 13

th

 of U9 of T-020 is generated.

- Check that DOT/PATTERN signal on 18

th

 of IC3 of T-020 is generated.

4. NBDP DATA TRANSMITTING

①

. Data is not transmitted.

-  Check  the  connector  that  is  correctly  connected  between  SRG-1150DN/SRG-1250DN  and 

terminal.

- Check that 1.7KHz±85Hz on the 11

th

 of DM1 of T-020 PCB.

- Check that the signal is supplied to SRG-1150DN/SRG-1250DN.

4-2 MODULATION OF SIMPLE MODULATOR

This equipment is designed to minimize adjust parts and all modulator (except the modulator for 

power  supply)  is  to  be  required  to  manufacturer  because  it  needs  an  accurate  measuring 

instrument and skilled technology.

4-3 CAUTION

1. In case of checking transmitter unit, contact dummy load.

2. In case of separating PCB (Electronic Board), pay attention to static electronic.

3. In case of modulating, use tools for mdulation.

4.  In  case  of  checking  or  modulating,  when  measuring  instrument  contact  in  each  circuit,  user 

should match signal of the circuit and PROBE of measuring.