Wurlitzer 7300, Инструкция по эксплуатации

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TUNIN G
The generators i nclud i ng the m aster osc i llators have been carefull y tuned at the factor y and
should not requ i re an y tun i ng unless so m e co mp onent i n the " m aster osc i llator stage" has been
changed. The tun i ng cons i sts of adjust i ng t w elve tun i ng slugs controll i ng the to p octave notes .
Tun i ng wi ll requ i re the use of a Strobo-Tuner i nd i cator and an i nsulated tun i ng hex-head w rench.
G eneral Ce m ent No. 8606 or W alsco No. 2543. The p rocedure i s as follo w s:
1 . Re m ove the to p .
2. Un
p lug the cable to the External A mp l i f i er and p lug th i s end i nto the Strobo-Tuner.
The level of the s i gnal to dr i ve the Strobo-Tuner can be controlled b y the E xp ress i on
Pedal.
3. Before atte
mp t i ng an y tun i ng, the techn i c i an should v i susll y locate the tun i ng slugs
for each note. The sh i eld cans are p ro p erl y m arked. Turn
i ng the slug
wi th the hex ­
head w rench clock wi se wi ll decrease the pi tch or flatten the note; turn i ng the slug
counter-clock wi se wi ll i ncrease the pi tch or shar p en the note.
4. Cancel all sto p s on the organ.
5 . Move the 8' Sto
p to the h i ghest p os i t i on .
6. The second octave, w h i ch ar-e the ke y s fro m C-13 to B-24, wi ll be used for the tun i ng.
7. De p ress ke y C-13 and observe the Strobo-Tuner. If the note i s not i n tune, the slug
should be rotated unt i l the Strobe p attern stands st i ll .
8. All the other notes i n the octave are handled the sa m e w a y . W hen all the t w elve slugs
have been adjusted, the ent i re organ i s tuned, because these "t w elve m aster" to p
octave notes control the ent i re range of the organ no m atter w hat sto p i s used.
ELECTRONIC UNI T S
I m portant - Before re
p lac i ng electron i c co mp onents i nd i scr imi natel y the techn i c i an should al w a y s
p erform a v i sual check look i ng f o r broken wi res, cold solder jo i nts, etc .
One of t w o t yp es of m eters are to be used i n troubleshoot i ng the electron i c un i ts - a Vacuu m Tube
Voltoh my st or a 20, 000 ohms p er volt m eter.
A conven i ent s i gnal trac i ng probe and s y ste m can be e mp lo y ed b y us i ng the i n p ut p hone p lug out
of the Express i on Pedal Cable and touch i ng s i gnal p o i nts i n the Co m bo s y ste m . For exa mp le, the
out p ut s i gnal from the generators can be p robed and heard at the IC' s or the ke y board b y touch i n g
the p hone p lug center to an y o f the nu m bered p o i nts found on Sche m at i cs No. 130684 and 1 30708.
Th i s p rocedure can qu i ckl y i solate the serv i ce to e i ther the generator or the ke y board.
The follo wi ng troubleshoot i ng suggest i ons are g i ven i n chart for m and cover the m ajor i t y of
serv i ce the techn i can m a y be called on to p erfor m :
I . COMBO DEAD
A . Neon pi lot la mp off
B . P i lot la mp on
No hu m or no i se out of the
s y ste m .
C . P i lot la mp on.
Onl y hu m or no i se out of
the s y ste m .
CHECK
1 . ON/OFF S wi tch
2 . Fuse
3 . Po
w er cord connect i on .
1 . Cables to E xp ress i on Pedal.
2. Check TR-8 and TR-9 Stages.
3 . Check M Br i ghtness Control.
1. Check 10 V and 1 4.8 V to Master
Osc i llator .
2. Check 3 .45 V to IC's
3. Check TR-8 and TR-9 Stages.
4 . Check Phone Jack .
5 . Chec k E xt ernal Am p l i f i er .
6. Ch
e ck set scre w on Ex p ress i on
Control Pot .