VK3TAE - AMATURE RADIO

SHINWA TSUSHINKI

SD303C RADIO PROGRAMMERMOD'S AND INFO

Original Shinwa SD303C Radio EEprom Programmer

CONVERSION OF THE MIDLAND 70-1050 DATA PROGRAMMER

TO A SHINWA SD303C PROGRAMMER

The 70-1050 Midland programmer can be converted to a SHINWA SD330C Radio Programmer

Conversion Steps.

1. Remove the 4K7 Resister from AR1 Pin 1 to 4

2. Remove Wire link from Eprom A4 Pin 2 to IC A10 GND PCB Solder point

STEP 1 STEP 2 PCB BOARD VARIATION

3. Place wire – Eprom A4 Pin 2 to A1 Pin 27 (D80C39HC).

4. Cut track between Pin 26 to Pin 27 of A4 (eprom)

5. Add a 100K Res between A4 Pin 1 to Pin 26 (eprom)

6. Run wire from A4 Pin 26 (eprom) to Toggle Switch.

7. Drill ¼” Hole through PCB + Case Add 2 pos DPST Sw

8. Place Wire - Pin 1 Z3 eeprom socket (5v) to switch.

9. Wire from switch to A10 Pin 26

10. Remove Midland eprom - Replace with Shinwa S/W ver 3

110VAC to 240VAC CONVERSION.

1. Place Orange wire from pin 1 (AC In) to Pin 2 (T1)

2. Place Brown Wire from Pin 2 (T1) to Pin 1 (AC In)

3. Change AC Plug to desires countr

Power Lead IN - Active to No 3 for 220V and Neutral to AC IN (F1) - Earth to frame

Midland 110 V Shinwa 220V R1 Pcb Different Markings

ADDITIONAL NOTES:

PCB Board Versions. ROM Writer 6376 Both Units

Midland 70-1050 has a ver R0 Board

Shinwa SD3003C has a ver R1 Board.

Version R1 has only a few track alteration on A10 pin 2 Area

A (L) (H) and a (C) is added to the Board to allow for HI Low Bank Switching on the eprom

The Eprom in the Midland is a 2764 and the Shinwa is a 27128.

The Shinwa eprom is divided into 2 banks. The Switch switches the banks between the SH/GII and the SC/X series radios.