Mackie FAST RECOVERY M-1400 User manual

M•1400 / M•1400i / M•1200
SERVICE MANUAL
1998 MACKIE DESIGNS, INC.
820-179-00
Version 1.2

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equilateraltriangleisintendedtoalerttheusertothe
presenceofuninsulated"dangerousvoltage"withinthe
product'senclosure,thatmaybeofsufficientmagnitudeto
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®
TABLE O F C O NTENTS
INTRO DUC TIO N............................................................. 2
SYSTEM O VERVIEW ....................................................... 3
SUMMARY O F FEATURES .....................................................................4
SPEC IFIC ATIO NS...................................................................................6
C IRC UITTHEO RY........................................................... 8
INPUTC IRC UITRY..................................................................................8
PO WER AMPLIFIER C IRC UITRY...........................................................8
PRO TEC TIO N C IRC UITS .......................................................................9
THERMALMANAG EMENT..................................................................10
SERVIC E PRO C EDURES............................................... 11
REQ UIRED EQ UIPMENTLIST..............................................................11
TRO UBLESHO O TING TIPS - O UTPUTFAILURES................................12
TESTAND BIASING PRO C EDURE......................................................13
PARTS............................................................................ 15
Q UIC K PARTS......................................................................................15
C HASSIS ASSEMBLY............................................................................16
HEATSINK ASSEMBLY..........................................................................18
C O MPLETE PARTS LIST........................................................................20
SC HEMATIC S / PC B LAYO UTS.................................... 23
INPUTPC B SC HEMATIC .....................................................................23
INPUTPC B LAYO UT............................................................................24
DISPLAY PC B SC HEMATIC ................................................................25
DISPLAY PC B LAYO UT........................................................................26
MAIN PC B SC HEMATIC S...................................................................27
MAIN PC B LAYO UT............................................................................30
SO FTSTARTPC B SC HEMATIC ...........................................................31
SO FTSTARTPC B LAYO UT...................................................................32
Click on any item to open that page

M•1200/M•1400 SERVIC E MANUAL
INTRO DUC TIO N
2
INTRO DUC TIO N
This ma nua l c o nta ins c o mp le te se rvic e info rma tio n fo r the M•1200, M•1400 a nd M•1400i
a ud io p o we r a mp lifie rs. O p e ra ting instruc tio ns w ill b e to uc he d o n b rie fly. Fo r c o mp le te
o p e ra ting instruc tio ns re fe r to the o wne r’ s m a nua l.
The FR Se rie sM•1200 a nd M•1400 a re hig h p o we r a ud io a mp lifie rs d e sig ne d fo r
p ro fe ssio na l a p p lic a tio ns. The y fe a ture a ud io p hile q ua lity so und , e xc e lle nt sta b ility,
e xte nsive p ro te c tio n c irc uitry, a nd le g e nd a ry Ma c kie re lia b ility. Pa te nte d Fa st Re c o ve ry
c irc uitry a llo ws the M•1200/ M•1400 to re c o ve r fro m c lip p ing witho ut g e ne ra ting
und e sira b le a rtifa c ts.
To se rvic e the M•1200/ M•1400, te c hnic ia ns sho uld b e fa milia r with o p -a mp s, d isc re te
a na lo g c irc uitry, a nd tro ub le sho o ting hig h p o we r so lid sta te a mp lifie rs. Pre se nta tio n o f
this m a nua l d o e s no t c o nstitute e nd o rse me nt o f q ua lific a tio ns b y Ma c kie De sig ns.
TEC HNIC ALSUPPO RT
Ma c kie De sig ns Te c hnic a l Sup p o rt De p a rtme nt is a va ila b le 8AM - 5PM PST, Mo nd a y -
Frid a y a t 1-800-258-6883 (o utsid e US c a ll 011-425-487-4333) Ple a se fe e l fre e to c a ll with
a ny q ue stio ns (Be tte r sa fe tha n so rry!).
DISC LAIMER
The info rma tio n c o nta ine d in this ma nua l is p ro p rie ta ry to Ma c kie De sig ns, Inc . The
e ntire ma nua l is p ro te c te d und e r c o p yrig ht a nd ma y no t b e re p ro d uc e d b y a ny me a ns
witho ut e xp re ss writte n p e rmissio n fro m Ma c kie De sig ns, Inc .
SERVIC E O N THE M•1200/ M•1400 IS
TO BE PERFO RMED BY EXPERIENC ED
TEC HNIC IA NS O NLY!
! SMD !
The M•1200/ M•1400 m a ke s e xte nsive
use o f surfa c e mo unt c o mp o ne nts.
Se rvic ing te c hnic ia ns sho uld ha ve the
to o ls a nd e xp e rie nc e to p e rfo rm
surfa c e mo unt re wo rk.

VERSIO N 1.1
SYSTEM O VERVIEW 3
SYSTEM O VERVIEW
This se c tio n p ro vid e s a q uic k sum ma ry o f the M•1200/ M•1400’ s ma jo r fe a ture s. It is no t
inte nd e d to ta ke the p la c e o f the o wne r’ s m a nua l. It is inc lud e d he re to he lp se rvic ing
te c hnic ia ns fa milia rize the mse lve s with the M•1200/ M•1400.
DIFFERENC ES BETWEEN THE M•1400, M•1400i AND M•1200
The M•1200 a nd M•1400 a re e le c tro nic a lly id e ntic a l p ro d uc ts with the fo llo wing
e xc e p tio ns:
1. The M•1400 ha s 12,000uF ma in filte r c a p s, whe re the M•1200 a nd M•1400i ha ve
10,000uF.
2. The M•1400 a nd M•1400i use a mo re p o we rful fa n tha n the M•1200.
3. The M•1400 ha s Sp e a ko nc o nne c to rs whe re the M•1200 a nd M•1400i ha ve ¼”
sp e a ke r o utp uts (b o th in a d d itio n to b ind ing p o sts).
The M•1200 wa s d isc o ntinue d in 1998 a nd re p la c e d b y the M•1400i.
Exp o rt M•1400’ s a lso ha ve a “ So ft Sta rt” c irc uit tha t is no t insta lle d o n Ame ric a n units.
FASTREC O VERY DESIG N
So lid sta te p o we r a mp lifie rs ha ve a re p uta tio n fo r so und ing ha rsh whe n d rive n into
c lip p ing . The usua l e xp la na tio n is o d d ha rmo nic s g e ne ra te d b y ha rd c lip p ing , b ut In
fa c t muc h o f the unp le a sa nt so und is c a use d b y la tc hing a nd p a ra sitic o sc illa tio ns tha t
o c c ur a s the a mp lifie r re c o ve rs fro m c lip p ing .
TYPIC AL AMPLIFIER MAC KIE FR SERIES
ARTIFACTSCAUSEDBY
LATCHINGANDPARASITIC
OSCILLATION
Ma c kie ’ s Fa st Re c o ve ry d e sig n re c o ve rs fro m c lip p ing q uic kly witho ut g e ne ra ting a ny
und e sira b le a rtifa c ts. This p e rfo rma nc e is a c hie ve d b y two uniq ue d e sig n e le me nts; the
Full Symme try Dua l Diffe re ntia l fro nt e nd p ro vid e s e xc e lle nt line a rity while minim izing the
ne e d fo r ne g a tive fe e d b a c k, a nd the Ba ke r C la mp p re ve nts o utp ut/ d rive r d e vic e
sa tura tio n. Ho w the se c irc uits o p e ra te is c o ve re d in d e p th in the c irc uit the o ry se c tio n.

M•1200/M•1400 SERVIC E MANUAL
SUMMARY O F FEATURES
4
SUMMARY O F FEATURES
FRO NTPANEL
1. G AIN
De te nte d g a in c o ntro ls a d just the le ve l se nt to e a c h o utp ut se c tio n. The g a in struc ture
is d e sig ne d so tha t a +4d Bu (1.23V rms) inp ut sig na l d rive s the a mp lifie r to full ra te d
p o we r into 4Ω.
2. METERS
The M•1200/ M•1400’ s me te rs ind ic a te the re la tive o utp ut le ve l o f the a mp lifie r
re fe re nc e d to full p o we r. The SIG (sig na l p re se nt) se nse s the inp ut p rio r to the g a in
c o ntro l.
3. PRO TEC T
The Pro te c t LEDs lig ht ind ic a ting the c ha nne l ha s b e e n mute d fo r o ne o f the fo llo wing
re a so ns:
•4 se c o nd turn o n d e la y
•O utp ut d e vic e s b e yo nd Sa fe O p e ra ting Are a (SO A), a lso lig hts SHO RTLED(s).
•He a tsink te mp e ra ture b e yo nd 80 d e g re e s C e lsius.
4. SHO RT
The Sho rt LEDs lig ht to sho w tha t the a mp lifie r ha s e ng a g e d p ro te c tio n d ue to a sho rt o r
lo w imp e d a nc e o n the o utp ut.
5. TEMP STATUS
The HO TLED lig hts to ind ic a te tha t the a mp lifie r ha s e ng a g e d p ro te c tio n d ue to
he a tsink te mp e ra ture o r p o we r tra nsfo rme r c o re te mp e ra ture .
6. PO WER SWITC H
This re ma rka b le d e vic e re q uire s ye a rs o f stud y to full c o mp re he nd .
OL
-3
-6
-2
0
-3
-6
-9
-2
0
SIG
O
L
SIG
CH
1
30
28
26
20 2218
2
4
1
6
1
4
8
1.23v(+4dBu)
SENSITIVITY
GAIN/dBCH
2
PROTECT
COL
D
HOT
SHORT
TEMPSTATUS
INTERNALSTATUS
CH
1
CH
2
CH
1&2
ON
OFF
POWER
3v
2v
1v
3
0
2
8
2
6
2
02
2
1
8
2416
14
8
1.23v(+4dBu)
SENSITIVIT
Y
GAIN/dB
3
v
2
v
1v
PROFE S S IONALPOWERAMPLIFIERFULL SYMMETRYDUALDIFFERENTIALHIGHCU R RENTDESIGN
-9
1 12 3 4 5 6

VERSIO N 1.1
SYSTEM O VERVIEW 5
REAR PANEL
1. SPEAKER O UTPUTS
The M•1400 ha s Sp e a ko nc o nne c to rs whe re the M•1200 ha s ¼” sp e a ke r o utp uts. Bo th
mo d e ls ha ve b ind ing p o sts. Fo r b rid g e d mo no o p e ra tio n, the + o utp ut c o me s fro m
c ha nne l o ne ’ s p o sitive te rmina l a nd - fro m c ha nne l two ’ s p o sitive .
2. INPUT
The M•1200/ M•1400 ha s b o th XLR a nd ¼” TRS inp uts. The y a re e le c tric a lly id e ntic a l
(wire d in p a ra lle l). In b rid g e d mo no o r p a ra lle l mo no mo d e c ha nne l 2 inp ut is d isa b le d .
3. THRO UG H
Ye t a no the r ja c k wire d in p a ra lle l with the Inp uts, the thro ug h ja c k p ro vid e s a
c o nve nie nt wa y to c ha in a mp lifie rs o r p a ss the sig na l to a ny o the r d e vic e .
4. LO W C UTFILTER
Swe e p s the b uilt in hig h p a ss filte r fro m 10Hz to 170Hz.
5. C O NSTANTDIREC TIVITY HO RN EQ / AIR EQ
Built in she lving EQ p ro vid e s hig h fre q ue nc y c o mp e nsa tio n whe n using c o nsta nt
d ire c tivity ho rns.
6. AMP MO DE
Thre e p o sitio n slid e switc h se le c ts STEREO , PARALLEL MO NO o r BRIDG E MO NO o p e ra tio n.
C ha nne l O ne ’ s inp ut sig na l is use d fo r PARALLEL MO NO a nd BRIDG E MO NO o p e ra tio n.
AMP MO DE a nd OUTPUTAPPLIC ATIO N switc he s sho uld no t b e c ha ng e d while the unit is
o n.
7. O UTPUTAPPLIC ATIO N
Pla c ing the thre e p o sitio n slid e switc h in its c e nte r p o sitio n d e fe a ts the b uilt in LIMITER fo r
b o th c ha nne ls. Se le c ting SUB WO O FER e ng a g e s the b uilt in lo w p a ss filte r. The
FREQ UENCY switc h se le c ts b e twe e n 125Hz a nd 63Hz c uto ff fo r the lo w p a ss filte r. In SUB
WO OFER mo d e , inp uts 1 a nd 2 a re summ e d re g a rd le ss o f AMP MO DE se tting .
(Re me mb e r, huma n he a ring is una b le to d isc e rn d ire c tio n a t fre q ue nc ie s whe re the
wa ve le nth is g re a te r tha n the d ista nc e b e twe e n yo ur e a rs, ~250Hz unle ss yo u ha ve a
g ro ssly la rg e he a d !)
CHANNEL
21
CHANNEL
CH
1
CH
2
SPEAKEROUTPUTS
+
--
+
63Hz
125Hz
CONSTANTDIRECTIVITY
HORNEQ/AIREQ
CONSTANTDIRECTIVITY
HORNEQ/AIREQ
INPUT
THRUTHRU
INPUT
AMPMODE
FREQUENCY
4.5
k Hz
ON
6kHz2kHz
MONOBRIDGE
LIMITER
( CH1&CH2)
OFF
FULL
RANGE
SUB
WOOFER
LOWCUT
FILTER
LOWCUT
FILTER
OUTPUTAPPLICATION
CAUTION
BALANCED
O
R
UNBALANCED
BALANCED
O
RUNBALANCED
AIREQ
MONO
BRIDGE
ON
/BRIDGE/MONO
170HzOFF
4.5kHz
6kHz2kHz
AIREQ
120VAC50/60Hz
1500WATTS
+
-
170Hz
100Hz
OFF
STAGE
MONITOR
100Hz
STAGE
MONITOR
OFF
TYPICAL
ON
OFF
TYPICAL
TYPICAL
35Hz
TYPICAL
35Hz
(MONOBRIDGE)
1200W A TTS
4OHMLOADMIN.
600 WATTSCH
2OHMSLOADMIN.
STEREO
TYPICAL
STEREO
TYPICAL
AIREQAIREQ
1 5
4 62
3 7
2
53
4

M•1200/M•1400 SERVIC E MANUAL
SPEC IFIC ATIO NS
6
SPEC IFIC ATIO NS
C O NTINUO US AVERAG E O UTPUT
PO WER, BO TH C HANNELS DRIVEN:
M•1200
225 w a tts p e r c ha nne l into 8 o hms fro m 20Hz to
20kHz, with no mo re tha n 0.025% THD
400 w a tts p e r c ha nne l into 4 o hms fro m 20Hz to
20kHz, with no mo re tha n 0.050% THD
600 w a tts p e r c ha nne l into 2 o hms fro m 20Hz to
20kHz, with no mo re tha n 0.095% THD
Bridg e d m o no o p e ra tio n:
800 w a tts into 8 o hms fro m 20Hz to 20kHz, with
no mo re tha n 0.050% THD
1200 wa tts into 4 o hms fro m 20Hz to 20kHz, w ith
no mo re tha n 0.095% THD
Ma ximum Po we r a t 1% THD:
250 w a tts p e r c ha nne l into 8 o hms
425 w a tts p e r c ha nne l into 4 o hms
640 w a tts p e r c ha nne l into 2 o hms
850 w a tts into 8 o hms b rid g e d
1280 w a tts into 4 o hm s b rid g e d
M•1400 / M•1400i
250 w a tts p e r c ha nne l into 8 o hms fro m 20Hz to
20kHz, with no mo re tha n 0.012% THD
425 w a tts p e r c ha nne l into 4 o hms fro m 20Hz to
20kHz, with no mo re tha n 0.025% THD
630 w a tts p e r c ha nne l into 2 o hms fro m 20Hz to
20kHz, with no mo re tha n 0.050% THD
Brid g e d m o no o p e ra tio n:
850 w a tts into 8 o hms fro m 20Hz to 20kHz, with
no mo re tha n 0.025% THD
1260 wa tts into 4 o hms fro m 20Hz to 20kHz, w ith
no mo re tha n 0.050% THD
Ma xim um Po we r a t 1 % THD:
300 w a tts p e r c ha nne l into 8 o hms
500 w a tts p e r c ha nne l into 4 o hms
700 w a tts p e r c ha nne l into 2 o hms
1000 w a tts into 8 o hms b rid g e d
1400 w a tts into 4 o hm s b rid g e d
No te : Po we r ra ting s a re sp e c ifie d a t
120VAC (U.S. a nd C a na d a ) a nd 240VAC
(Exp o rt) line vo lta g e s.
The M•1200/ M•1400 p o we r a m p lifie rs d ra w
la rg e a mo unts o f c urre nt fro m the AC line w ith
c o ntinuo us sine wa ve te sting . Ac c ura te
me a sure me nt o f p o we r re q uire s a ste a d y a nd
sta b le AC sup p ly. This me a ns the line
imp e d a nc e m ust b e ve ry lo w to insure tha t the
p e a k AC line vo lta g e d o e s no t sa g to le ss tha n
97% o f its va lue .
If d riving hig hly re a c tive lo a d s, we re c o mme nd
tha t the limite r c irc uit b e e ng a g e d .
PO WER BANDWIDTH:
20Hz to 70kHz (+0, –3 d B)
FREQ UENC Y RESPO NSE:
20Hz to 40kHz (+0, –1 d B)
10Hz to 70kHz (+0, –3 d B)
DISTO RTIO N:
THD, SMPTE IMD, TIM < 0.025% @ 8Ω
< 0.050% @ 4Ω
< 0.150% @ 2Ω
SIG NAL-TO -NO ISE RATIO :
> 107 d B b e lo w ra te d p o we r into 4 o hms
C HANNEL SEPARATIO N:
> 80 d B @ 1kHz
DAMPING FAC TO R:
350 m inimum
INPUTIMPEDANC E:
20k  b a la nc e d b rid g ing
INPUTSENSITIVITY:
1.23 vo lts (+4 d Bu) fo r ra te d p o we r into 4 o hms
G AIN:
30.25 d B (32.5V/ V)
MAXIMUM INPUTLEVEL:
9.75 vo lts (+22 d Bu)

VERSIO N 1.1
SPEC IFIC ATIO NS 7
RISE TIME:
< 4.4µs
SLEW RATE:
Vo lta g e Sle w Ra te > 50V/ µs
> 100V/ µs b rid g e d
C urre nt Sle w Ra te > 32A/ µs a t 2Ω
C MRR:
> 40 d B, 20Hz to 20kHz
LO AD ANG LE:
8(±jx) time ind e p e nd e nt a t 8Ω
4(±jx) time d e p e nd e nt, T> 6 min. a t 4Ω
2(1±jx) time d e p e nd e nt, T> 2 min. a t 2Ω
TRANSIENTREC O VERY:
< 1µs fo r 20 d B o ve rd rive @ 1kHz
HIG H FREQ UENC Y O VERLO AD AND
LATC HING :
No la tc h up a t a ny fre q ue nc y o r le ve l.
HIG H FREQ UENC Y STABILITY:
Unc o nd itio na lly sta b le d riving a ny re a c tive o r
c a p a c itive lo a d .
TURN O N DELAY:
3 se c o nd s
VARIABLE LO W-C UTFILTER:
10Hz (O ff) to 170Hz, 2nd O rd e r Be sse l
SUBWO O FER LO W-PASS FILTER:
Switc he d : 63Hz/ 125Hz, 3rd O rd e r Be sse l
C O NSTANTDIREC TIVITY HIG H
FREQ UENC Y BO O ST:
2kHz to 6kHz (+3 d B p o ints)
6 d B/ o c ta ve hig h-fre q ue nc y she lving filte r,
(she lving o c c urs a t a p p ro xima te ly 30kHz)
LIMITER SEC TIO N:
C o mp le m e nta ry Po sitive a nd Ne g a tive Pe a k
De te c ting
INDIC ATO RS:
6 me te r LEDs p e r c ha nne l
SIG (Sig na l Pre se nt), –20, –9, –6, –3, O L
(O ve rlo a d )
C H 1 & 2
PRO TEC TLEDs
SHO RTLEDs
TEMP STATUS
C O LD/ HO TLEDs
PO WER C O NSUMPTIO N:
65 w a tts a t id le
900 w a tts w ith m usic a l p ro g ra m fully lo a d e d
(2 o hms p e r sid e , o r 4 o hms b rid g e d )
550 w a tts w ith m usic a l p ro g ra m fully lo a d e d
(4 o hms p e r sid e , o r 8 o hms b rid g e d )
850 w a tts a t full p o we r into 8 o hms
(c o ntinuo us sine wa ve )
1500 w a tts a t full p o we r into 4 o hms
(c o ntinuo us sine wa ve )
2500 w a tts a t full p o we r into 2 o hms
(c o ntinuo us sine wa ve )
AC LINE PO WER:
US 120VAC , 60Hz
Euro p e 240VAC , 50/ 60Hz
Ja p a n 100VAC , 50/ 60Hz
Ko re a 220VAC , 60Hz
AC DRO P-O UTVO LTAG E:
At a p p ro xim a te ly 50% o f ra te d line vo lta g e
PHYSIC AL:
He ig ht 3.5 inc he s (89m m )
Wid th 19.0 inc he s (483mm )
De p th 15.25 inc he s (387mm )
O ve ra ll De p th 16.25 inc he s (413mm )
Ha nd le De p th 1.25 inc he s (32mm )
We ig ht 36 p o und s (16.3kg )
Sinc e w e a re a lwa ys striving to m a ke o ur stuff
b e tte r a t Ma c kie De sig ns b y inc o rp o ra ting ne w
a nd im p ro ve d ma te ria ls, c o m p o ne nts, a nd
ma nufa c turing me tho d s, we re se rve the rig ht to
c ha ng e the se sp e c ific a tio ns a t a ny time
witho ut no tic e .

M•1200/M•1400 SERVIC E MANUAL
C IRC UITTHEO RY
8
C IRC UITTHEO RY
Muc h o f the c irc uitry in the M•1200/ M•1400 is se lf e xp la na to ry fro m the sc he ma tic . This
se c tio n will e xp la in the uniq ue c irc uits a nd a rc hite c ture . Sa mp le s in this se c tio n will re fe r
to C ha nne l 1 (Le ft) fo r c irc uitry tha t is id e ntic a l o n b o th c ha nne ls.
INPUTC IRC UITRY
Re fe r to sc he ma tic o n p a g e 23.
The sig na l p a th b e g ins with the INPUTBO ARD. Fo llo wing C ha nne l 1’ s inp ut, sig na l is fe d
to a unity g a in d iffe re ntia l o p -a mp , U1A. The sig na l is ne xt se nt to U1B whic h se rve s a s
b o th HPF a nd C D ho rn EQ . If no t in SUBWO O FER mo d e , the summing a mp (U2B) a nd
LPF’ s (U3A, U3B) a re b yp a sse d . The sig na l is se nt via J11 to the g a in c o ntro l o n the
DISPLAY BO ARD. Afte r the g a in c o ntro l, the sig na l is b uffe re d b y U7A, re turne d to the
INPUTBO ARD a nd ro ute d to the MAIN BO ARD via J16.
C ha nne l 2’ s inp ut sig na l p a th is e le c tric a lly id e ntic a l to C ha nne l 1’ s in STEREO mo d e . In
PARALLEL MO NO mo d e C ha nne l 2’ s inp ut sig na l is ig no re d a nd C ha nne l 1’ s inp ut is se nt
to C ha nne l 2’ s g a in c o ntro l via SW5A. Fo r BRIDG E MO NO o p e ra tio n, C ha nne l 1’ s inp ut
sig na l is inve rte d b y U2A a nd ro ute d to the MAIN BO ARD via SW5C .
PO WER AMPLIFIER C IRC UITRY
Re fe r to sc he ma tic o n p a g e 27.
The M•1200/ M•1400 use a c la ss AB trip le d a rling to n o utp ut with c o mp le me nta ry o utp ut
d e vic e s. The ma in p o w e r sup p ly is +/ - 80V, the re is a lso a +/ - 90V sup p ly fo r the fro nt
e nd c irc uitry. C ha nne ls a re mute d fo r 4 se c o nd s o n p o we r up a s C 53 c ha rg e s via R203.
Muting is a c hie ve d b y turning o ff Q 73, re mo ving c urre nt so urc e s fo r the d iffe re ntia l p a irs.
(Wa it a minute ! PAIRS? Re a d o n…)
An imme d ia te ly o b vio us d e p a rture fro m sta nd a rd d e sig ns is the Dua l Diffe re ntia ls a nd
Sym me tric a l Vo lta g e Amp s. The re a so ning b e hind this fro nt e nd a rc hite c ture is
a c tua lly q uite simp le . Tra nsisto rs tra nsfe r c ha ra c te ristic s a re no t e ntire ly line a r, so e ve n
the b e st c o nve ntio na l fro nt e nd d e sig n will intro d uc e so me d isto rtio n. Mo st a mp lifie rs
use ne g a tive fe e d b a c k to re d uc e this p ro b le m (c re a ting a fe w mo re in the p ro c e ss).
Ma c kie FR Se rie s a mp lifie rs ta ke a d iffe re nt a p p ro a c h. By using two c o mp le me nta ry
“ mirro r im a g e ” fro nt e nd c irc uits a ny d isto rtio n c a use d b y no n-line a r tra nsisto r c urve s is
e ffe c tive ly c a nc e le d o ut in the b ia s string , witho ut fe e d b a c k!
Ano the r d e sig n fe a ture uniq ue to Ma c kie FR Se rie s Am p lifie rs is the Ba ke r C la mp . The
Ba ke r C la mp ha s two func tio ns; 1) Pre ve nt o utp ut/ d rive r tra nsisto rs sa tura ting , 2) Drive
the LIMITER LDR. Re fe rring to the le ft ma in a mp sc he ma tic , Q 27 is a c o m mo n b a se
a m p lifie r, it will turn o n if Q 31’ s c o lle c to r rise s mo re tha n two d io d e d ro p s a b o ve the
+80V sup p ly, p re ve nting it fro m rising furthe r. The re a re thre e d io d e d ro p s b e twe e n
Q 31’ s c o lle c to r a nd the b a se o f d rive r tra nsisto r Q 28 (D3, D2, Q 29Vb e ). Q 29 will ne ve r
se e a vo lta g e g re a te r tha n o ne d io d e d ro p b e lo w the +80V sup p ly, e ve n if the +80V
sup p ly fluc tua te s. Q 27 a lso d rive s the limite r LDR LED U2A. The ne g a tive sid e ha s the
sa m e c irc uit mirro re d .

VERSIO N 1.1
C IRC UITTHEO RY 9
PRO TEC TIO N C IRC UITS
Re fe r to sc he ma tic s o n p a g e s 27-29.
The M•1200/ M•1400 ha s two o utp ut p ro te c tio n c irc uits in a d d itio n to the ra il fuse s. The
first mute s the a mp if the o utp ut d e vic e s a re lo a d e d b e yo nd the ir sa fe o p e ra ting a re a
(SO A). The se c o nd is a c ro wb a r c irc uit tha t e nsure s the ra il fuse s b lo w if the re is DC o n
the o utp ut.
SO A PRO TEC TIO N
The SO A p ro te c tio n c irc uit se nse s the vo lta g e d ro p a c ro ss the e m itte r re sisto rs muc h like
sta nd a rd VI c urre nt limiting tra nsisto rs. Q 76 a nd Q 77 will turn o n if the e m itte r d ro p
e xc e e d s ~1V. If the y a re o n fo r lo ng e no ug h to c ha rg e C 38 (thro ug h R159), the SO A
p ro te c tio n c irc uit is a c tiva te d b y tra nsisto r switc he s Q 79 a nd Q 78.
If SO A d e te c tio n is trip p e d , the c ha nne l is mute d b y d isc ha rg ing C 53 thro ug h R200 a nd
D65, fa n sp e e d is inc re a se d , a nd the “ SHO RT” LED lig hts.
DC C RO WBARS
The DC C ro wb a r c irc uit p ro te c ts sp e a ke rs in the e ve nt o f a n o utput fa ilure b y b lo wing
a ll ra il fuse s. SC Rs Q 21-24 a re use d to sho rt the +/ - 80V sup p ly sup p lie s to g ro und .
O utp ut sig na l fro m b o th sid e s is fe d thro ug h 100K re sisto rs R90, R89 to C 21, e sse ntia lly
fo rming a LPF. DC o n e ithe r o utput will trig g e r c o mp a ra to r U4A (p o sitive ) o r U4B
(ne g a tive ). The SC Rs a re the n fire d via d rive r tra nsisto rs Q 87, Q 88.
NO TE:
The LM339 c o mp a ra to r IC is use d e xte nsive ly in the
M•1200/ M•1400. It d iffe rs fro m a sta nd a rd o p -a mp
use d a s a c o mp a ra to r in tha t it ha s a n o p e n
c o lle c to r o utput. If the vo lta g e a t the inve rting inp ut
e xc e e d s the no n-inve rting , the LM339’ s o utp ut
switc he s to it’ s ne g a tive sup p ly. O the rwise , the
o utp ut is o p e n.

M•1200/M•1400 SERVIC E MANUAL
C IRC UITTHEO RY
10
THERMAL MANAG EMENT
Re fe r to sc he ma tic o n p a g e 29.
The M•1200/ M•1400 T-De sig n He a tsink/ Fa n c o o ls o utput d e vic e s e ve nly a nd d o e s no t
c o lle c t d ust o n the c irc uitry. The fa n o p e ra te s a t two sp e e d s, c o ntro lle d b y the
a mp lifie r. An LM35DZ mo unte d in the c e nte r o f the he a tsink p ro vid e s te mp e ra ture
info rm a tio n to the fa n c o ntro l a nd o ve rte mp c irc uits. The re is a lso a the rma l b re a ke r in
the p o we r tra nsfo rme r.
FAN C O NTRO L C IRC UIT
The fa n vo lta g e c o me s fro m a fe e d b a c k re g ula to r c irc uit fo rme d b y Q 91 a nd Q 92. The
o utput vo lta g e is p ro g ra mme d b y the ra tio o f R209 to R211/ / R207 (/ / =p a ra lle l). Whe n
the unit is p o w e re d up C 83 c ha rg e s thro ug h R241 p ro vid ing a 40 se c o nd d e la y b e fo re
the fa n sta rts. As C 83 c ha rg e s, U6D’ s o utp ut switc he s to -16V, sta rting the fa n. The n
U6A’ s o utp ut switc he s to o p e n, a llo wing U6B to inc re a se the fa n sp e e d , if trig g e re d . R240
a nd C 82 g ive the fa n e xtra vo lta g e whe n sta rting .
The fa n sp e e d is inc re a se d b y U6B a d d ing R211 in p a ra lle l with R207. (Q 91 wa nts it’ s
b a se a d io d e d ro p a b o ve g ro und , so Q 92 d o ub le s its Em itte r vo lta g e ). U6B is trig g e re d
b y U4D to inc re a se fa n sp e e d if;
•C ha nne l 1 SO A p ro te c tio n is a c tiva te d (U5C ), O R
•C ha nne l 2 SO A p ro te c tio n is a c tiva te d (U5D), O R
•The he a tsink is a b o ve 60 d e g C (U5B) AND p ro g ra m is d e te c te d (U4C ), O R
•The he a tsink te mp e ra ture is a b o ve 80 d e g C (U5A).
U6C a nd Q 89 a re use d to re se t the c irc uit o n p o we r d o wn. Und e r no rm a l o p e ra tio n
C 50 is c ha rg e d via D57, Ho ld ing Q 89 o ff. Whe n p o we r is re mo ve d C 50 d isc ha rg e s a nd
Q 89 switc he s o n a s the ra ils c o lla p se . Whe n the vo lta g e o n Q 89’ s c o lle c to r fa lls b e lo w
g ro und U6 switc he s to the ne g a tive ra il d isc ha rg ing C 82 a nd C 83.
THERMAL SHUTDO WN
Extre me he a tsink o r tra nsfo rm e r c o re te mp e ra ture will a c tiva te O VERTEMP. U5A
a c tiva te s o ve rte mp if the LM35DZ d e te c ts he a tsink te mp e ra ture a b o ve 80 d e g C .
Fe e d b a c k re sisto r R137 re sc a le s U5A’ s vo lta g e re fe re nc e so tha t the he a tsink must c o o l
to b e lo w 50 d e g C b e fo re o ve rte mp is d e a c tiva te d . O ve rte mp c a n a lso b e a c tiva te d
b y the p o we r tra nsfo rme r the rm a l b re a ke r (via Q 89). In e ithe r c a se , b o th c ha nne l a re
mute d via D69 a nd D66.

VERSIO N 1.1
SERVIC E PRO C EDURES 11
SERVIC E PRO C EDURES
MEC HANIC AL PRO C EDURES
The M•1200/ M•1400 d e sig n a llo ws e a sy re mo va l o f a ll c o mp o ne nts a nd a sse mb lie s.
Disa sse mb ly a nd re a sse mb ly sho uld b e se lf e vid e nt. This m a nua l ha s e xp lo d e d
d ia g ra ms in the p a rts se c tio n.
Se ve ra l imp o rta nt p o ints c o nc e rning the a sse mb ly:
•4 o f the sc re ws tha t se c ure the to p c o ve r a lso ho ld the fro nt e xtrusio n (c urve d
p ie c e ) in p la c e . Whe n re m o ving the to p c o ve r, b e c a re ful tha t the fro nt e xtrusio n is
no t d ro p p e d .
•If the MAIN PC B is re mo ve d , b e sure the sma lle r he a d ma c hine sc re ws (750-050-04)
a re re p la c e d ne xt to the filte r c a p s. The la rg e r he a d m a c hine sc re ws c a n a rc to the
c a p a c ito r b o d y.
•Be sure a ll tyw ra p s a re re p la c e d a nd tha t no wire s a re in d a ng e r o f b e ing p inc he d
in-b e twe e n the c o ve r a nd he a tsink.
REQ UIRED EQ UIPMENTLIST
•30 MHz d ua l tra c e o sc illo sc o p e
•DMM (Must b e c a p a b le o f m e a suring 8mV DC with a m inimum o f 2 d ig its o f
a c c ura c y, a nd d o wn to .1Ω)
•Sine wa ve o sc illa to r / Func tio n g e ne ra to r (20Hz - 20KHz)
•4 lo a d re sisto rs (8Ωw ith a m inimum 500W p o we r ra ting )
•10A / 120V Va ria c With AC vo ltme te r a nd a d e fe a ta b le a mme te r (1 Amp full ra ng e )
o r wa ttme te r (300 Wa tts full ra ng e )
•0.1uF 400V film c a p a c ito r insta lle d a c ro ss d ua l b a na na p lug
•16 AWG sho rting jum p e r insta lle d a c ro ss d ua l b a na na p lug
REC O MMENDED EQ UIPMENTLIST(PERFO RMANC E VERIFIC ATIO N)
•Disto rtio n a na lyze r a nd lo w d isto rtio n o sc illa to r.
(C a p a b le o f re so lving d isto rtio n a s lo w a s 0.002% fro m 20Hz to 20KHz)
•2500W AC p o we r so urc e .

M•1200/M•1400 SERVIC E MANUAL
SERVIC E PRO C EDURES
12
TRO UBLESHO O TING TIPS - O UTPUTFAILURES
Afte r a c a ta stro p hic fa ilure , it is like ly tha t the fo ur +/ -80V sup p ly fuse s will b e b lo w n.
Re p la c e fuse s a nd ve ry slo wly b ring up the Va ria c while mo nito ring line c o nsump tio n. It
is like ly tha t sub sta ntia l line c urre nt will b e p ulle d d ue to sho rte d o utp ut p a rts. At the
sa me time , lo o k fo r DC o ffse t a t the o utp ut. O ffse t o f g re a te r tha n +/ - 2.8V will trig g e r
the p ro te c tio n c irc uits a nd re -b lo w the fo ur fuse s. Ke e p the o utp ut o ffse t b e lo w +/ - 2V,
o r te mp o ra rily d e fe a t the DC -o ffse t d e te c to r (Lift o ne sid e o f D56).
Re mo ve the ma in b o a rd fro m the unit a nd c he c k fo r sho rte d o utp ut tra nsisto rs. If o ne
b a d o utp ut is fo und , re p la c e a ll e ig ht in the c ha nne l. Whe n a n o utp ut d e vic e sho rts it
c a n p la c e hig h c urre nt stre sse s o n the o the r o utp ut p a rts. The se o utp ut p a rts c a n fa il
o ve r time . Sinc e lo ng te rm re lia b ility is p a ra m o unt, p le a se re p la c e a ll the o utp uts.
All e ig ht o f the 3W 0.22Ωe mitte r re sisto rs must b e ve rifie d fo r p ro p e r va lue . Any o ff-
to le ra nc e , o r o p e n p a rts, ne e d to b e re p la c e d . An o ff to le ra nc e (hig he r re sista nc e )
e mitte r re sisto r will p re ve nt it’ s re la te d o utp ut tra nsisto r fro m “ d o ing it’ s sha re ” a nd w ill
p la c e mo re stre ss o n it’ s ma te s in the o utp ut se c tio n. Also ve rify the 8 b a se d rive re sisto rs
(2.2Ω, 1/ 4W, fusib le ) a re a ll O K. Ve rify tha t the d rive rs a nd p re -d rive rs a re no t sho rte d . If
o ne d rive r is sho rte d re p la c e it’ s ma te . Do the sa me with the p re -d rive rs. Also c he c k a ll
the re sisto rs surro und ing the d rive rs a nd p re -d rive rs.
C he c k the VI limite rs a nd d e te c to rs. It is no t unc o mmo n to d a ma g e the se p a rts whe n
the a m p lifie r fa ils in a sp e c ta c ula r wa y! Lo o k fo r sho rts o n Q 76, Q 77, Q 94, Q 95, Q 83,
Q 84, Q 96, a nd Q 97. Ve rify p ro p e r va lue o n the re sisto rs tha t g o to the b a se s o f the se
d e vic e s. It is c ritic a l tha t the se se c tio ns a re wo rking c o rre c tly. Sho rte d tra nsisto rs c a n
c a use so me o d d a sym me tric a l c lip p ing p ro b le m s. O p e n p a rts will no t a llo w the c urre nt
limiting to o p e ra te e ffe c tive ly. If p ro b le ms e xist in the se se c tio ns the a mp lifie r mig ht fa il
into a sho rt, o r mig ht c lip p re ma ture ly whe n lo a d e d to 2Ω.
All o f the a b o ve tro ub le sho o ting (No t inc lud ing p a rt re p la c e me nt) ta ke s p e rha p s 15 to
30 minute s to d o . If yo u ta ke the time , a nd d o a ll tha t is ind ic a te d a b o ve , it will a llo w
99% o f the a m p lifie rs to c o me up the first time ! Trying to hurry, a nd skip p ing w ha t is
sug g e ste d , c a n le a d to a frustra ting a nd tim e c o nsuming re p a ir.
Slo wly b ring up the sup p ly a nd ve rify tha t line c o nsump tio n isn’ t e xc e ssive a nd tha t the
o utput is c e nte re d (no DC o ffse t). It m ig ht b e d e sira b le to d e fe a t the a mp lifie r muting
(C o nne c t U5-12, 13, & 14 to g e the r) te mp o ra rily so the a mp lifie rs a re a c tive e ve n whe n
the sup p lie s a re still ve ry lo w. If the a mp sta ys c e nte re d , ve rify tha t it will p a ss a nic e
c le a n sine wa ve . Re mo ve a ny te st jump e rs (I.E. DC -fa ult d e fe a t & muting d e fe a t) a nd
p ro c e e d to the “ Re lia b ility Ve rific a tio n” se c tio n.

VERSIO N 1.1
SERVIC E PRO C EDURES 13
BIAS AND TESTPRO C EDURE
Afte r the unit ha s b e e n re p a ire d , the fo llo wing sho uld b e d o ne to a ssure lo ng te rm
re lia b le o p e ra tio n. If a d isto rtio n a na lyze r is p re se nt, d isto rtio n sp e c ific a tio ns sho uld b e
ve rifie d .
1. Ad justs b ia s in b o th c ha nne ls (R1 & R51) fo r 8mV +/ - 0.3mV a t b ia s te st p o ints (J53 &
J54) a fte r unit ha s id le d fo r a fe w minute s. With Full AC line vo lta g e a p p lie d to unit,
it will p ull a ro und 65W fro m the line (900m A a t 120V). Me a sure fo r DC o ffse t o n b o th
o utp ut c o nne c to rs. DC o ffse t sho uld b e le ss tha n +/ - 50mV.
2. Ap p ly a 1KHz sine wa ve to the inp uts a nd ve rify tha t the unlo a d e d o utp uts ha ve a
wa ve fo rm tha t is symm e tric a l a nd und isto rte d . Drive the o utp uts into c lip p ing a nd
ve rify sym me tric a l “ fla t-to p p ing ” o n the wa ve fo rm.
3. Re d uc e o utp ut le ve ls, insta ll the 0.1uF c a p a c ito r jump e r fro m the o utp ut to g ro und
c o nne c tio ns, a nd ve rify tha t c lip p ing b e ha vio r is p ro p e r. Ve rify tha t no hig h
fre q ue nc y o sc illa tio n o c c urs ne a r a nd a t c lip p ing (p a ra sitic o sc illa tio n).
4. Re mo ve c a p a c itive lo a d ing a nd minim ize sine o utp ut. Ve rify a nd re -a d just b ia s if
re q uire d . No te tha t the b ia s will no t d rift a p p re c ia b ly in a unit tha t is func tio ning
p ro p e rly.
5. C o nne c t the a mp lifie r d ire c tly to the AC line a nd c o nne c t a n 8Ωd um my lo a d to
b o th c ha nne ls. Bring sine w a ve le ve l up o n b o th c ha nne ls a nd ve rify symme tric a l
c lip p ing . The o utp ut will c lip so me whe re b e twe e n 120V - 140V p k/ p k d e p e nd ing o n
ho w stiff the line is. C lip p ing sho uld b e a s d e sc rib e d a b o ve . Ad d the 0.1uF
c a p a c itive lo a d ing a nd ve rify c lip p ing is still we ll b e ha ve d .
6. Ind ivid ua lly lo a d C ha nne l 1 a nd C ha nne l 2 with 2Ω. C lip p ing sho uld b e
symm e tric a l, we ll b e ha ve d , a nd o c c ur so m e whe re a ro und 80V - 100V p k/ p k. Ve rify
tha t c lip p ing is we ll b e ha ve d a fte r a d d ing the 0.1uF c a p a c itive lo a d ing .
7. Re d uc e o utp ut le ve l to 20V p k/ p k a nd sho rt first c ha nne l o ne a nd the n c ha nne l
two . The fro nt p a ne l “ sho rt” a nd “ p ro te c t” LEDs sho uld fla sh o n the re sp e c tive
c ha nne ls.
8. Pla c e a mp lifie r in b rid g e mo d e a nd c o nne c t 4Ωlo a d ing to b rid g e o utp uts (a c ro ss
b o th “ +” o utp ut b ind ing p o sts). Slip so me c a rd sto c k b e twe e n the he a tsink-o utle ts
a nd c ha ssis sid e s. Mo nito r o ne o f the o utp uts a nd a d just fo r a 20V p k/p k sig na l.
Sho rt a c ro ss b o th o utp uts a nd ve rify tha t a ll fo ur ‘ Sho rt” a nd “ Pro te c t” LEDs lig ht a nd
the a mp lifie r mute s.
9. Re mo ve sho rt, m o nito r o ne o f the o utputs, a nd a d just fo r a 60V p k/p k sine o utp ut
(450W o f o utp ut p o we r b rid g e d ). Afte r a fe w minute s the fa n will b e g in running fa st
(he a tsink a t 60°C ) a nd a sho rt tim e la te r the a mp lifie r will mute (he a tsink a t 80°C ).
The “ Ho t” a nd “ p ro te c t” LEDs will c o me o n. Re mo ve c a rd sto c k a nd a fte r a fe w
minute s the a mp lifie r will c o me o ut o f mute mo d e a nd the “ c o ld ” LED will re turn.
10. Disc o nne c t lo a d ing a nd re mo ve d rive . Re c o nne c t a mp lifie r to Va ria c a nd c o nfirm
tha t the id le c o nsum p tio n is ro ug hly 65W o r 900mA, a s b e fo re . C o nne c t the
a mp lifie r to sp e a ke rs a nd ve rify tha t it so und s O K with music .

M•1200/M•1400 SERVIC E MANUAL
SERVIC E PRO C EDURES
14
(THIS PAG E UNINTENTIO NALLY LEFTBLANK), THO SE RESPO NSIBLE HAVE BEEN PUTTO THE SWO RD

VERSIO N 1.1
PARTS 15
PARTS
Q UIC K PARTS
FRO NTPANEL
OL
-3
-6
-2
0
-3
-6
-9
-2
0
SIG
O
L
SIG
CH
1
30
28
26
20 2218
2
4
1
6
1
4
8
1.23v(+4dBu)
SENSITIVITY
GAIN/dBCH
2
PROTECT
COL
D
HOT
SHORT
TEMPSTATUS
INTERNALSTATUS
CH
1
CH
2
CH
1&2
ON
OFF
POWER
3v
2v
1v
3
0
2
8
2
6
2
02
2
1
8
2416
14
8
1.23v(+4dBu)
SENSITIVIT
Y
GAIN/dB
3
v
2
v
1v
PROFE S S IONALPOWERAMPLIFIERFULL SYMMETRYDUALDIFFERENTIALHIGHCU R RENTDESIGN
-9
REAR PANEL
CHANNEL
21
CHANNEL
CH
1
CH
2
SPEAKEROUTPUTS
+
--
+
63Hz
125Hz
CONSTANTDIRECTIVITY
HORNEQ/AIREQ
CONSTANTDIRECTIVITY
HORNEQ/AIREQ
INPUT
THRUTHRU
INPUT
AMPMODE
FREQUENCY
4.5
k Hz
ON
6kHz2kHz
MONOBRIDGE
LIMITER
( CH1&CH2)
OFF
FULL
RANGE
SUB
WOOFER
LOWCUT
FILTER
LOWCUT
FILTER
OUTPUTAPPLICATION
CAUTION
BALANCED
O
R
UNBALANCED
BALANCED
O
RUNBALANCED
AIREQ
MONO
BRIDGE
ON
/BRIDGE/MONO
170HzOFF
4.5kHz
6kHz2kHz
AIREQ
120VAC50/60Hz
1500WATTS
+
-
170Hz
100Hz
OFF
STAGE
MONITOR
100Hz
STAGE
MONITOR
OFF
TYPICAL
ON
OFF
TYPICAL
TYPICAL
35Hz
TYPICAL
35Hz
(MONOBRIDGE)
1200W A TTS
4OHMLOADMIN.
600 WATTSCH
2OHMSLOADMIN.
STEREO
TYPICAL
STEREO
TYPICAL
AIREQAIREQ
G AIN C O NTRO LS
5KL PO T, 130-036-00
KNO B, 760-061-00
NUT, 705-013-00
STAR WASHER, 710-023-00
PO W ER SW ITC H
500-022-00
ALL LEDS
RED T-1, 304-001-00
G REEN T-1, 304-004-00
HANDLE ASSEMBLYS
RIG HT, 080-023-10
LEFT, 080-023-20
SC REW(TO C HASSIS),700-028-04
A C LINE C O RD
US, 640-006-00
EURO PE, 640-007-01
JAPAN, 640-007-02
ENG LAND, 640-007-03
ITALY, 640-007-04
AUSTRALIA, 640-007-05
SWITZERLAND, 640-007-06
STRA IN RELIEF
740-004-00
INPUTSEC TIO N
ALL KNO BS, 760-048-04
LO W C UT, 50KZx2 PO T, 130-017-02
C D HO RN EQ , 10KC PO T, 130-037-02
¼” INPUTJAC K, 400-214-00
¼” JAC K WASHER, 710-002-00
¼” JAC K NUT, 705-003-00
MALE XLR JAC K, 400-142-00
FEMALE XLR JAC K, 400-141-00
XLR JAC K SC REWS,700-055-00
DP3TSWITC HES, 500-023-00
DPDTSWITC HES, 500-024-00
SPEA KER O UTPUTS
BINDING PO STS, 400-119-00
BINDING PO STSC REW, 700-011-00
M•1200/ M•1400i
¼” JAC K, 400-118-00
WASHER, 710-019-00
SLO TTED NUT, 705-015-00
M•1400
SPEAKO N, 400-138-00
SC REW, 700-055-00
INTERNAL FUSES
RAIL FUSES;
10A 5X20MM, 510-021-00
MAIN FUSE;
20A, 510-017-00
8A, 510-023-00

M•1200/M•1400 SERVIC E MANUAL
PARTS
16
C HASSIS ASSEMBLY
4
5
8
12
3
6
1 7
1
11
9
10
12
13
15
16 17 18
14

VERSIO N 1.1
PARTS 17
C HASSIS ASSEMBLY PARTS LIST
ITEM # PART# DESC RIPTIO N NO TES
1700-028-02 SEMS 6-32X3/ 8 PHP BLKZC ALL SIDE PANEL SC REWS
2550-221-00 TO P C O VER - M1200
3700-041-04 MC H 6-32X3/ 8 FL 100DG BLK TO P C O VER TO C HASSIS
4551-029-00 EXTR SC RN DSPLY BZL-M1200
4551-029-10 EXTR SC RN DSPLY BZL-M1400
5700-041-04 MC H 6-32X3/ 8 FL 100DG BLK MANIFO LD TO FAN
6550-277-00 SC REEN MANIFO LD - M1400
7550-223-20 SIDE RAIL LEFT- M1200
8550-223-10 SIDE RAIL RIG HT - M1200
9550-222-00 BTM C O VER - M1200
9550-244-00 BO TTO M C O VER - M1400
10 080-023-20 PNTHANDLE ASSY LEFT
11 080-023-10 PNTHANDLE ASSY RIG HT
700-028-04 SEMS 6-32X3/ 4 PHP BLKZC HANDLE ASSY TO C HASSIS
700-041-04 MC H 6-32X3/ 8 FL 100DG BLK HEATSINK TO C HASSIS BO TTTO M
12 TRANSFO RMER / MO UNTING
600-016-00 XFMR M1200 120V
600-016-01 XFMR M1200 230V
600-016-02 XFMR M1200 100V
705-019-00 NUTHEX 5/ 16-18
710-017-00 WASH SPLTLC K 5/ 16 HEAVY
710-024-00 WASH FLAT5/ 16 HARD (USS)
550-249-00 PLATE XFMR MTG - M1200
780-111-00 RUBBER PAD
700-059-00 HEX 5/ 16-18X3IN G D-5
13 550-247-00 SHIELD INPUT- M1200
14 780-042-00 INSULMYLAR INPUTSHIELD
15 055-079-00 PC B ASSY INPUT1200/ 1400
16 700-028-02 SEMS 6-32X3/ 8 PHP BLKZC INPUTPC B TO SHIELD
17 760-048-04 KNO B 9MM DARK G RAY
18 550-275-00 SPAC ER PLATE - AMPLIFIER
710-002-00 WASHER FO R ¼” JAC KS
705-003-00 NUTFO R ¼” JAC KS
700-055-00 MC H 4-24X3/ 8 PHP BLK HILO XLR JAC K SC REWS
055-080-00 PC B ASSY DISPLY 1200/ 1400
055-081-00 PC B ASSY MAIN - 1200
080-072-01 PC B ASSY MAIN - M1400
080-072-02 PC B ASSY MAIN - M1400i
700-028-02 SEMS 6-32X3/ 8 PHP BLKZC MAIN PC B TO C HASSIS EXC EPTFO R:
700-050-04 MC H 6-32X3/ 8 FIL PHL C LR ! USE THESE NEXTTO C APS !
700-011-00 MC H 4-40X1/ 4 BTNSKTBLKO X O UPTUTTERMINALS TO C HASSIS
710-019-00 WASH FIBRE BLK (W/ JAC K)
705-015-00 NUTSLO TNC KL
700-055-00 MC H 4-24X3/ 8 PHP BLK HILO

M•1200/M•1400 SERVIC E MANUAL
PARTS
18
HEATSINK ASSEMBLY