Acom 1500 Manual Penggantian - Halaman 6

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6. Adjustment of the Idling Current.

After each tube replacement, the BIAS voltage needs to be re-adjusted in order to

individually align the tube operating regime. There is an information screen

"Plate Current" on the display, foreseen to monitor the plate current during this

procedure. The two adjustment trimmer-potentiometers are located on the MAINS PCB.

a) Install the aluminum RF-screen cover of the RF deck (18 countersunk screws).

Put and tighten provisionally two small strip pieces to two of the nuts on the

middle chassis wall which are close to the HV LID crowbar as well as to the cover-

presence micro-switch sensor (around the two yellow arrows in the picture below).

These will provisionally imitate a top cover presence during the adjustment

procedure. Check that the provisional pieces are tightened reliably in order not

to let them slip the crowbar or the cover-sensing switch during the next

operations.

W A R N I N G

===========================

Be careful - HIGH VOLTAGES up to 3000V will exist permanently on the accessible

wiring and on the PCBs which is

track that nobody could access the amplifier and do not leave it without

supervision during all the time that the amplifier is with the cover removed!

Connect a dummy load (or an antenna) to the output. Install all cables to the

exciter as usually. Now, feed mains voltage, turn on the amplifier and let the

tube warming up for at least 15 minutes in STANDBY mode.

and all accessible HV parts during this period!

LETHAL!

Keep away of the parts and the PCBs! Keep

Safeguard the amplifier