Instruction manual

Installation
3-2
1720/1721
1
1
A3 Main Bd
J696 Ext sync source
J796 Subcarrier refJ921 X High gainJ920 Y High gain
J245 Blanking disable
Front
Figure 3-1: Plug jumper locations. A small arrow on the board, next to the plug
jumper, denotes pin 1.
Table 3- 1: Internal Jumper Selection
Jumper
Number
Name Position Purpose
A3J696 External Sync Source (EXT REF Input) 1-2 EXT REF (factory preset)
Converted to CW Subcarrier Input 2-3 CH-A INPUT
A3J796 Subcarrier Reference 1-2 EXT REF (factory preset)
2-3 CW Subcarrier appl ied to EXT REF INPUT
A3J920 Y Input High Gain Out Balanced 600Ω input (factory preset)
In Single-ended high gai n mode
A3J921 X Input High Gain Out Balanced 600Ω input (factory preset)
In Single-ended high gai n mode
A3J245 Blanking Disable Out Normal Bl anking (fact ory preset )
In CRT Blanking disabled
A3A1 J100 Light Enable 1-2 Lights Enabled (factory preset)
2-3 Lights Disabled