Service Bulletin
From: TRIO-KENWOOD COMMUNICATIONS, INC.
TS-520/S, TS-820/S #842
Date: 01/26/81
Subject: DS-2 Replaces DS-1A DC-DC Converter
The DS-1A DC-DC converter for the TS-820 series and TS-520/S has been replaced by a new model, the DS-2. The wiring color code is the same. The physical size is smaller. Two additional mounting holes must be drilled in the transceiver rear panel.
Diagram Description: The DS-2 converter is physically smaller than the DS-1A. Two additional 2mm mounting holes need to be drilled into the transceiver's rear panel for installation. The wiring color code remains the same for both DS-1A and DS-2.
Wiring Color Code:
| Wire Color (DS-1A) | Wire Color (DS-2) | Connection |
|---|---|---|
| PURPLE | PURPLE | P.T. |
| BLUE | BLUE | R1 (BLT) |
| BROWN | BROWN | B2 (BRN) |
| GRAY | GRAY | BCT (GRY) |
| GREEN | GREEN | B1 (GRN) |
| ORANGE | ORANGE | C2 (ORA) |
| BLACK | BLACK | CCT (BLK) |
| RED | RED | C1 (RED) |
| YELLOW | YELLOW | E2 (YEL) |
| WHITE | WHITE | E1 (WHT) |
DS-2 (W type only)
Specifications
| Semiconductor | 2N4280 x 2 |
| Rated Final Stage Input Power at 13.8 VDC | SSB: 130W PEP, CW: 100W |
| Power Consumption | Receive: 3W, Heaters OFF: 0.8A, Heaters ON: 4.5A, Transmit: 15A |
| Power Supply | 12-16 VDC (standard: 13.8V) |
| Dimensions | W: 80 mm (3.15"), H: 37 mm (1.46"), D: 69 mm (2.72") |
| Weight | 240g |
Parts List
| Ref. No. | Parts No. | Description | Remarks |
|---|---|---|---|
| B50-2736-00 | Operating manual | [star] | |
| C1 | CE02W1E221 | C 220µF 25V | |
| E08-1207-05 | 12P plug | ||
| E20-0513-05 | 5P terminal | ||
| F05-1531-05 | Fuse 15A | ||
| F29-0414-04 | Insulating washer | ||
| H01-2694-03 | Carton case (inside) | [star] | |
| H10-2541-04 | Cushion | [star] | |
| H25-0029-04 | Protective bag | ||
| H25-0103-04 | Protective bag | ||
| H25-0120-04 | Protective bag | ||
| J13-0029-05 | Fuse holder | ||
| J41-0024-15 | Cord bush | ||
| R1 | R92-0121-05 | Cement resistor 2.4Ω 5W | |
| R2 | R92-0120-05 | Cement resistor 220Ω 2.5W | |
| Q1,2 | V30-1161-06 | TR 2N4280 |
Diagram Description: The DS-2 circuit schematic illustrates the use of two 2N4280 transistors (Q1, Q2) along with resistors (R1, R2), capacitors (C1), and a 15A fuse. It details connections for the power connector, DC cable, and heater switch. The unit is packaged with an operating manual, cushion, and protective bags. Installation may require self-tapping screws and a 15A fuse.
