Acom 1500 Ersatz-Handbuch - Seite 2

Blättern Sie online oder laden Sie pdf Ersatz-Handbuch für Verstärken Acom 1500 herunter. Acom 1500 9 Seiten. Tube replacement

c) Before proceeding, please make sure that no residual DANGEROUS VOLTAGES are

present in the amplifier. For this purpose take approximately 1m of WELL-INSULATED

lead (adequate for 3000V). Bare it to about 1cm at both ends.

Tighten one end of the wire under the GROUND STUD (on the rear

panel). Only

AFTERWARDS, holding the wire BY THE INSULATION, at a distance of minimum 10cm (4

Inch), ground with the tip of its second end momentarily and consecutively each

part on the HV rectifier PCB, especially:

- the HV output J3;

- the wire-wound resistor R12 on its both sides;

- the four HV diodes on their both sides.

With the tip of the same

permanently grounded

wire, on the MAINS PCB ground

momentarily the diode D19 on its both sides (D19 is located at the PCB edge, near

the powerful MOSFET transistor which is installed on the chassis).

Removing the Screen above the RF Deck.

Using a Philips-1 screwdriver, unscrew 18 pcs of countersunk-head screws to

release the aluminum cover above the RF deck. Lift and pull the cover to remove

it.

Repeat step 2(c) to discharge any residual high voltages, this time grounding

momentarily the copper strip of the plate anti-parasitic suppressor and the tube

anode cap with the tip of the

permanently grounded

wire.