( ) Set the transposer to "C" (normal pitch).
( ) Set the master pitch control (on A P 1) to the centre of rotation.
( ) Depress the swell pedal completely.
( ) Push the programming switch "Cancel" (if applicable).
3.3 First-Time Power On
Important: There will be AC line voltage present from now on at various locations
in the organ. Keep your hands away from the AC line connector, power
transformer, AC toggle switch and pilot light.
( ) Turn on power to the organ for a few seconds only. Quickly scan the
instrument with your eyes and nose on the lookout for smoke. The power
amplifier may hum and hiss slightly and even a few faint sounds may be heard.
But there should be no July 4 spectacle taking place.
( ) If everything seems to behave in an orderly manner check the power supply
voltages (+ and -15 V D C).
( ) In case of trouble at this stage remove the supply lines at the subunits
throughout the organ one by one (but positive and negative lines simultaneously)
to isolate the culprit. Keep notes of what you are doing such that you can restore
the instrument after locating the problem.
( ) Confirming test for operating power supply, tone generator and power
amplifier: Hold a finger of one hand to the terminal "E" of one of the power
amplifiers. The amplifier will hum now. Run a finger of the other hand along the
foil side of the circuit boards G 2 of the tone generator. Tones should be heard
besides all other noises.
( ) Jam a key of each manual in the depressed position. While holding on to the
amplifier terminal, touch the terminals "SO" or "SIN- of the keyer block. Again,
tones at various pitches should be heard.
3.4 Testing of the L/Man Drawbars
( ) Set all trim pots on the preamplifiers to their centres of rotation.
( ) Pull all 12 drawbars of the lower manual out half way.
( ) Jam a key in the centre of the lower manual in the depressed position. There
should be no audible sound yet.
( ) Clip the test lead to plug 4, terminal S 2 of the right preamp. The drawbar
signal should appear from the right speaker.
[ ] If no tone is heard touch the terminal E 2 (plug 3) of the right Area m p with
one hand (use a short piece of bare wire to reach down into the rear opening of
the connector) and touch the input pins of the lower manual drawbars with your
other hand. You should hear 11 different pitches when touching the drawbar pins
sequentially. If no tones appear the problem is likely to be found on the
preamplifier. Are the supply voltages present? Do you measure - 15 V D C at the
control terminal S2? Is the ribbon cable installed underneath the preamplifiers?
( ) Clip the test lead to the terminal S 2 of the left preamp. The sound should
now appear from the left speaker.
( ) If a problem appears to be confined to the preamplifiers consult the manual A
M 540 and find out which IC's are responsible for the input gating of E 2/S 2.
Swap IC's of like types.
( ) Push all drawbars except the left most drawbar home. The sound will
disappear. Pull out single drawbars of the lower manual one by one and check
for proper sequence of the pitches. Release the key on the lower manual.
3.5 Testing of the Lower Manual Envelope Control
The operation of the 4 envelope control switches for the lower manual can be
tested by using the drawbars.
( ) Turn on the switch "Soft Attack". When depressing a key on the lower manual
the tone buildup should be slower than before.
( ) Turn on the switches "Short Sustain"; " Medium Sustain" and "Long Sustain"
successively. The tone decay after the release of a key should become
progressively longer.
AM 079 (Part)
6
