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Page 2
Checking the speaker protection relay
- Disconnect speaker load.
- Apply 6 to 8 V d.c. with 220 kohm in series (+ and - alternatelv) to R508/R509. The relay should then open.
The power supply board seen from the solder side
NOTE!
lnput FET's 0103/0104 and O203/O2O4 are matched pairs, and should be.replaced with the same group. Each matched pair of transistors needs a spesific value of source resistors (written
by hand on the pc board). After replacing the FET's, check for correct current.
The voltage across R147 /R247 should be 2.2Y t 0.2 V.
All measurements in the amplifier must be made with a probe having minimum 5 kohms.
Peak clipping
Adjust R1371R237 to minimum tight in LED at slight dipping.
220 kohm
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