Fisher STATESMAN 3 S 78 Service Manual

Page 1

THE FISHER

STATESMAN I
. SERVICE

I 5 r, MODEL S-78

PRICE: $1.00

FISHER RADIO CORPORATION - NEW YORK

Page 10

ALIGNMENT INSTRUCTIONS .

MULTIPLEX SECTION

GENERAToII INDICATOR ALIGNMENT
RF
AUDIO 1er A
STEPS CONNECTION FREQUENCY 33%; CONNECTION ADJUST INDICATION NOTES
Audio osgillaior AC VTVM Io iundion Lloo Us! hex . I
I connccled ia lug I 5° 2 '°" N°"' or C2) and R728 alignnlonl coal) M'""'" ""9'
Mulvialox gonoralar 19 KC (:5 (p5) 1100 lop and
1 audio ou'Dul Ia ailaI vane, None DC VIVM In T.S.P. I01 boNom (Use hex Maximum voltage 1
lug I (So. Nola I) mv alipnmoni Idol)
Scope herix. inpulvo 1101 S bl 2 L' '
- I9KCot Io em; la a : Issawus
3 Same as sup 1 I9 58"?! '°"°' None van. indullo iungc'ion (Use K-Iran pallern. ilvegurd I
officzlé glnd R209, ulignmem '00 phasc cf panorn
xiemu sweep
Vuvryxg:enercior lisfiaitlasx pufllrn
I aquul s an remain
4 Same as sup 2 l9 xc Nona Same as Slop :l {mm 5° ,9 Ham," on, m I, 2
200 my eniiro 150 "IV Tang:
Ac VTVM and soap.
(Lflfiégffo'flly iron. inpur Io ohannal 210° ,9 Maximum indicafion on
5 Sam. as 5999 2 1 I, m ' None A ouiaul lug. w h .05.) AC V1VM.Cluon 1000 l. a
1;; P'P; DC lvnfimol sr§$p.w1 cps waveform on scope
- ' M Ia , . .
. Minimum roading on
locum on rlohl
. Ac VTVM should pa
5 Sam: us Slop z [Bfhfo'fiflnzmy' Non. samo as slop 5 M {ffgmw or Iaqsr 33 duh-low I
(2 3 LP) veadlng ubffilnod In
' Step 5
Move scope inpul and Nor. anal record
7 Sumn as Sm: 2 Same as Sup 6 Non, AC VTVM Io channel B -- volmge reading I
ovlpur lug an Ac VTVM
(IAoloIzops o'n lelfl h AEIVJVM lreadigg
z anno on y, ___ s ou oal oasl db
5 5" ° 5' 2 I velr rm: N0" 5" M 5"? 7 below roading oIsservod I
(2.3 P-P) in sup 7
9°00 1 °" "9" AC VTVM readin
9
9 Sarno or sun 2 (Bl fihffi,";'"j,""' None 5am. os soap 7 - should be rho saml as I
(1 a M) observed in Step 7
WI 1" 'i" i fiiVJVM l°°li n
: arms on y, ____ s ou or or an
In Same ax Slop 2 1 m" "m Non. samo a. sroa 7 belawuwiw alum I
(2.5 P-P) in Slop 9
n Repeal SIaps 9 and 10 with sec 9 and AC VTVM cannemd Io (hnnnel A oufipm lug, but slarl wilh
aoco cps apoliad lo leH :hanne ror Iirsi reading, Ihon swiloh lo riahl channel for (and readings
Mulriplu oonoralor loo°/ ~ .
12 If aquuI Io I000 up; on It (75 KC Div.) {39°13}? '1" f: ____ 1', "d "g?
300~ehm anionno lA) channol only No pm» ° " V 9 "" "9
Iorrninals emphasis °'' '" °" C "V
AREii'ir'i/"I'I'Tdil' I?"
. s ou o
13 Same as Slap I2 1333,5335 3,3,; 5513:]? Sarno ax Sioo 12 m5 aI loos. 33 db loolayr
reading ubservad in
5...: I2
Ac VTVM reading
H s s. 12 3000 (p: on Iefl Same as s 2 ____ should bo lo db below A
9 l 9 (A) channel only Srop I2 m I" 5"? roading ubxerved in
Skin 12
3000 ' h s hAclaVIiwiardl'odhinlg
cpson IIQ I urns G! l on 0 saw
5 5° 5" 1 lal channel only slop 12 5° 5" 1 - wading obsazrvcd in 4
lap I

NOTE: The above procedure is based on The use of the FISHER

Model 300 Multiplex Generator.

I - ln maps 2 Ihraugh II, Ihe audio ourpuI or rho MulIiplox sonoranr
should be connected Io lug I or The muliiplu sub-chassis Ihrough a
new ohm, Vwalr, carbon resisior, and o 150 uui oaaaoilor should
be ronnoorod beiween lug I and ground. The wiring horn rho MPX
TEST idols on «he rnoin chassis Io lug I musl be disconnooiod during
Shops 2 Ihrough il.

2 # Tho rorliaal umplimde of The Ilssoious poilorn will increase slighvly

us rho gonoralor oquuI is incraased. This ix a normal ooourrenoo.

3 - If DC VTVM reading in: below -9 volts when maximum reading
is obtained on Oh: AC VTVM, readiusi honor of ZIOO, 'Ilen repeat
Shop 5. horror rhis procedule uniil maximum AC VTVM roading is ab-
Iainod wilh DC VTVM rooding groaior Ihon -9 vol.

4-Tune The FISHER to Oh: RF output fraquency of "II Mulliplox
Gene'uiov,