Velleman K4020, Manual

Page: 26 / 56

H4020-ED2-26
ASSEMBLY
VERY IMPORTANT
- MOUNT ALL COMPONENTS AGAINST THE PRINT
- USE A SMALL SOLDERING IRON OF MAX. 40W
- USE THIN (1mm) SOLDERING TIN
- CARELESS ASSEMBLY WILL UNDOUBTEDLY LEAD TO PROBLEMS
The amplifier consists of two identical prints, which will be mounted on the left
and right hand side of the heat sink of the house. Between the prints, the
toroidal transformers will be mounted on the bottom plate.
On the front panel the prints of the LED power meters are mounted (option).
ASSEMBLY OF THE AMPLIFIER PRINTS P4020A (REPEAT PROCEDURE
TWICE)
Mount the jumpers marked J on the pcb.
Jumper JG (next to C35) must be fitted for now (see also section "Bridge
configuration")
Mount the following 1/4W resistors:
- R26 and R52, 3K3 (orange, orange, red)
- R27 and R28, 8K2 (grey, red, red)
- R29 to R31, 330K (orange, orange, yellow)
- R32 to R36, 18K (brown, grey, orange)
- R37 and R38, 4K7 (yellow, purple, red)
- R39 and R40, 47K (yellow purple, orange)
- R41, 47 ohms (yellow, purple, black)
- R42, 27K (red, purple, orange)
- R43 and R44, 10K (brown, black, orange)
- R45A, 470 ohms (yellow, purple, brown) (*) see note
- R45B and R47, 560 ohms (green, blue, brown)
- R46, 47K (yellow, purple, orange) (*) see note
- R48 to R51, 10K (brown, black, orange)
- R53 to R58, 180 ohms (brown, grey, brown)
- R59, 39K (orange, white, orange)
- R60, 1K5 (brown, green, red)
- R65 and R66, 1K (brown, black, red)
- R61 to R64, 2K2 (red, red, red)
- R67 and R68, 82K (grey, red, orange)
NOTE: When the amplifier will be used in a bridge configuration, R45A should
not be fitted in one amplifier and a jumper should be fitted for R46.