Mackie M1200, M1400, M1400i Schematic

M•1400 / M•1400i / M•1200

SERVICE MANUAL

Version 1.2

1998 MACKIE DESIGNS, INC.

820-179-00

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The lig htning flash w ith arro wh ea d symb o l within an e quilate ral trian gle is inte nde d to ale rt the use r to the p rese nc e o f uninsulate d "d ang ero us vo lta ge " w ithin the p rod uc t's e nc lo sure , tha t ma y b e o f suffic ient m ag nitud e to c on stitud e a risk o f ele ctric sho c k to pe rson s.

Le symb o le é c la ir a ve c po int d e flé c he à l'inte rie ur d'un tria ng le é q uila té ra l e st utilisé p our a le rte r l'utilisa te ur d e la p ré se nce à l'inte rieur d u c of fre t d e "vlo tag e d ang e re ux" no n iso le d 'a mp le ur suffisa nte p o ur c on stitue r un risq ue d 'é lé c tro c ution.

AT TENT ION : POUR EVITE R LE S

RI SQUES DE CHOC ELECT R IQU E, NE

PA S EN LEV ER L E COUV ERCLE . A U CUN

EN TRET IEN DE PIECE S IN TER IEUR ES

PAR L'US AGE R. C ONFIER L 'ENT RET IEN

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SA N S L AIS SER AUC UNE PA R T IE A

DE C OUVER T .

The exc lam ation p o int within a n e q uila te ra l tria ng le is intend e d to a le rt the use r to the p re se nc e of imp o rta nt op e ra ting and ma inte nan c e ( se rvicing ) instruc tio ns in the literature a c c om pa nying the a pp lia nce .

Le p o int d'e xc la ma tio n à l'inté rie ur d 'u n tria ng le d e la pré se nc e d 'instruc tio ns imp orta nte s p ou r le fo nc tio nne me nt e t l'e ntre tien (se rvic e ) da ns le livre t d 'in struc ion a c c o mp a g na nt L'a p p a re il.

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TABLE O F C ONTENTS

INTRO DUC TION............................................................. 2

SYSTEM O VERVIEW ....................................................... 3

SUMMARY O F FEATURES .....................................................................4

SPEC IFIC ATIO NS...................................................................................6

C IRC UIT THEO RY........................................................... 8

INPUT C IRCUITRY..................................................................................8

POWER AMPLIFIER C IRC UITRY...........................................................8

PRO TEC TION C IRCUITS .......................................................................9

THERMAL MANAG EMENT..................................................................10

SERVIC E PRO C EDURES............................................... 11

REQ UIRED EQ UIPMENT LIST..............................................................11

TRO UBLESHO O TING TIPS - O UTPUT FAILURES................................12

TEST AND 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

INPUT PCB SC HEMATIC .....................................................................23

INPUT PCB LAYOUT............................................................................24

DISPLAY PCB SCHEMATIC ................................................................25

DISPLAY PCB LAYO UT........................................................................26

MAIN PC B SC HEMATICS...................................................................27

MAIN PC B LAYO UT............................................................................30

SOFT START PC B SC HEMATIC ...........................................................31

SOFT START PC B LAYO UT...................................................................32

INTRO DUC TION

This ma nua l c o nta ins c o m p 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 m p lifie rs. O p e ra ting instruc tio ns will be 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 w ne r’ s ma 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 de sig ne d fo r

p ro fe ssio na l ap p lic atio ns. The y fe ature a ud io p hile q ua lity so und , e xc e lle nt stab ility, e xte nsive pro tec 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 w itho ut g e ne ra ting und e sira b le a rtifa c ts.

SERVIC E O N THE M•12 00/ M•1400 IS

TO BE PERFO RMED BY EX PERIENCED

M•1200/M•1400 SERVIC E MANUAL

TECHNICIANS O NLY!

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 m p s, d isc re te a na lo g c irc uitry, a nd tro ub le sho o ting high p o w e r so lid state a m p lifie rs. Pre se ntatio n o f this ma nua l do e s no t c o nstitute e ndo rse me nt o f q ua lific a tio ns b y Ma c kie De sig ns.

TECHNIC AL SUPPO 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 ble 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 w ith a ny q ue stio ns (Be tte r sa fe tha n so rry!).

DISCLAIMER

! SMD !

The M•1200/ M•1400 m a ke s e xte nsive

use o f surfa c e m o 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 w o rk.

The info rm a 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 m a nua l is p ro te c te d unde r c o p yrig ht a nd m a y no t b e re p ro d uc e d b y a ny me a ns witho ut e xp ress writte n p e rmissio n fro m Ma c kie De sig ns, Inc .

INTRO DUCTIO N

VERSIO N 1.1

SYSTEM O VERVIEW

This se c tio n p ro vide s a q uic k summa ry o f the M•1200/ M•1400’ s ma jo r fe ature s. It is no t inte nd e d to ta ke the p la c e o f the o w ne r’ s ma nua l. It is inc lud e d he re to he lp se rvic ing te c hnic ia ns familia 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 ide ntic a l pro d uc ts w ith the fo llo wing e xc e ptio ns:

1. The M•1400 ha s 12,000uF ma in filte r c ap s, whe re the M•1200 a nd M•1400i ha ve

10,000uF.

2. The M•1400 a nd M•1400i use a m o re p o we rful fa n tha n the M•1200.

3. The M•1400 ha s Sp e a ko n

spe a ke r o utputs (b o th in a d d itio n to bind ing p o sts).

The M•1200 wa s d isc o ntinue d in 1998 a nd re p lac e d b y the M•1400i.

Exp o rt M•1400’ s a lso ha ve a “ So ft Start” c irc uit tha t is no t insta lle d o n Am e ric a n units.



c o nne c to rs whe re the M•1200 a nd M•1400i ha ve ¼”

FAST REC O VERY DESIG N

So lid sta te po w e r a m p lifie rs ha ve a re p utatio n fo r so und ing ha rsh whe n d rive n into c lipp 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 sant 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 m p lifie r re c o ve rs fro m c lip p ing .

TYPICAL AMPLIFIER MACKIE FR SERIES

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 quic kly w itho 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 hieve d b y two uniq ue d e sig n e le me nts; the

Full Sym m e 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 m inim izing the

ne e d fo r ne g a tive fe e db a c k, a nd the Ba ke r C la m p pre ve nts o utput/ d rive r d e vic e satura tio n. Ho w the se c irc uits o pe 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.

ARTIFACTS CAUSED BY LATC HING AND PARASITIC OSCILLATIO N

SYSTEM OVERVIEW

SUMMARY O F FEATURES

FRO NT PANEL

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 de sig ne d so tha t a +4dBu (1.23V rms) inp ut sig na l drive s the a mp lifie r to full rate d

p o we r into 4Ω.

2. METERS

The M•1200/ M•1400’ s me ters indic ate the re la tive o utput le ve l o f the a mp lifie r re fe re nc e d to full po w e 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 tec 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 w ing 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 RT LED(s).

• He a tsink te m p e ra ture b e yo nd 80 d e g re e s Ce lsius.

M•1200/M•1400 SERVIC E MANUAL

4. SHO RT

The Sho rt LEDs lig ht to sho w tha t the a mp lifier 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 da nc e o n the o utput.

5. TEMP STATUS

The HO T LED lig hts to ind ic a te tha t the a mp lifier ha s e ng a g e d p ro te c tio n d ue to he a tsink te m p 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 ars o f stud y to full c o m p rehe nd.

PR OFE SS IO NA L POW ER AMP LIFIE RFULL S YMM ETRY D UAL D IFFER ENTI AL HI GH CU RRE NT DE SIGN

GAIN/dB CH

2218

-3

6 1 4

SENSITIVITY

1.23v (+4dBu)

-6

4 26

-9

-2

SIG

GAIN/dB

-3

-6

-9

-2 0

SIG

SENSITIVIT

221

2416

2 6

8 3 0

1.23v (+4dBu)

1 12 3 4 5 6

CH1CH

INTERNALSTATUS

PROTECT

SHORT

TEMP STATUS

1&2

COLDHOT

OFF

POWER

SUMMA RY OF FEATURES

VERSIO N 1.1

REAR PANEL

1. SPEAKER O UTPUTS

The M•1400 ha s Spe a ko n mo d e ls ha ve b ind ing po sts. Fo r b ridg e d mo no o p e ra tio n, the + o utp ut c o m e s fro m c ha nne l o ne ’s po sitive te rmina l a nd - fro m c ha nne l two ’s po sitive .



c o nne c to rs whe re the M•1200 ha s ¼” sp e aker o utp uts. Bo th

2. INPUT

The M•1200/ M•1400 ha s b o th XLR and ¼” TRS inp uts. The y a re e le c tric a lly ide ntic a l (w ire d in p a ra lle l). In b rid g e d m o no o r p a ra lle l m o no mo d e c ha nne l 2 inp ut is d isa b le d .

3. THROUGH

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 pro vid e s a c o nve nie nt w a y to c ha in a m p lifie rs o r p a ss the sig na l to a ny o the r d e vic e .

4. LO W CUT FILTER

Swe e ps the b uilt in hig h p a ss filte r fro m 10Hz to 170Hz.

5. C O NSTANT DIREC TIVITY HO RN EQ / AIR EQ

Built in she lving EQ p ro vide 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 po 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 pe ratio n. AMP MODE a nd O UTPUT APPLIC ATIO N switc he s sho uld no t b e c ha ng e d while the unit is o n.

7. O UTPUT APPLICATIO 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 ag e s the b uilt in lo w pa ss filte r. The FREQ UENC Y 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 O FER m o d e , inputs 1 a nd 2 a re summe d re g a rd le ss o f AMP MO DE se tting . (Re m e 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 rea te r tha n the dista nc e b e twe e n yo ur e a rs, ~250Hz unle ss yo u ha ve a g ro ssly larg e he a d!)

(MONO BRIDGE)

1200 WATTS

4 OHM LOAD MIN.

600 W A TTS CH

2 OHMS LOAD MIN.

120 VAC 50/60 Hz

1500 WATTS

CAUTION

MONO BRIDGE

SPEAKER OUTPUTS

1 5

4 62

/ BRIDGE / MONO

CHANNEL

LOW CUT

FILTER

BALANCED

TYPICAL

RUNBALANCED

35 Hz

STAGE

MONITOR

100 Hz

170 Hz

OFF

CONSTANT DIRECTIVITY

HORN EQ/AIR EQ

4.5

6k Hz2k Hz AIR EQ

OFF

TYPICAL

INPUT

3 7

STEREO TYPICAL

OUTPUT APPLICATION

FULL

RANGE

(

CH1 & CH2)

LIMITER

STEREO

TYPICAL

AMP MODE

MONO BRIDGE

OFF

WOOFER

SUB

FREQUENCY

125Hz

63Hz

THRUTHRU

CHANNEL

HORN EQ/AIR EQ

LOW CUT FILTER

TYPICAL

35 Hz

STAGE

MONITOR

100 Hz

170 HzOFF

4.5k Hz

6k Hz2k Hz AIR EQAIR EQ

AIR EQ

INPUT

BALANCED

UNBALANCED

CONSTANT DIRECTIVITY

OFF

TYPICAL

SYSTEM OVERVIEW

SPEC IFIC ATIO NS

M•1200/M•1400 SERVIC E MANUAL

C O NTINUO US AVERAG E O UTPUT POWER, BO TH C HANNELS DRIVEN:

M• 120 0

225 wa tts pe r c ha nne l into 8 o hms fro m 20Hz to 20kHz, with no mo re tha n 0.025% THD

400 wa tts pe r c ha nne l into 4 o hms fro m 20Hz to 20kHz, with no mo re tha n 0.050% THD

600 wa tts pe 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 mono o p e ration:

800 wa tts into 8 o hm s 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 w e r a t 1% THD:

250 wa tts p e r c ha nne l into 8 o hms 425 wa tts p e r c ha nne l into 4 o hms 640 wa tts p e r c ha nne l into 2 o hms 850 wa tts into 8 o hms b rid g e d

1280 wa tts into 4 o hms b rid g e d

M• 140 0 / M• 140 0i

250 wa tts pe r c ha nne l into 8 o hms fro m 20Hz to 20kHz, with no mo re tha n 0.012% THD

425 wa tts pe r c ha nne l into 4 o hms fro m 20Hz to 20kHz, with no mo re tha n 0.025% THD

630 wa tts pe r c ha nne l into 2 o hms fro m 20Hz to 20kHz, with no mo re tha n 0.050% THD

Bridg e d mo no o p e ra tio n:

850 wa tts into 8 o hm s 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 ximum Po we r a t 1% THD:

300 wa tts p e r c ha nne l into 8 o hms 500 wa tts p e r c ha nne l into 4 o hms

700 wa tts p e r c ha nne l into 2 o hms 1000 wa tts into 8 o hms b rid g e d 1400 wa tts into 4 o hms b rid g e d

No te: Po w e 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 (Expo 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 with c o ntinuo us sine wa ve te sting . A c c ura te me a sure m e nt o f p o we r re q uire s a stea d y a nd sta b le AC sup p ly. This me ans 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 do 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 ds, w e re c o mme nd tha t the lim ite r c irc uit b e e ng ag e d.

POWER BANDWIDTH:

20Hz to 70kHz (+0, –3 dB)

FREQ UENC Y RESPONSE:

20Hz to 40kHz (+0, –1 dB) 10Hz to 70kHz (+0, –3 dB)

DISTO RTIO N:

THD, SMPTE IMD, TIM < 0.025% @ 8Ω

< 0.050% @ 4Ω < 0.150% @ 2Ω

SIGNAL-TO -NOISE RATIO :

> 107 d B be lo w ra te d p o we r into 4 o hms

C HANNEL SEPARATIO N:

> 80 d B @ 1kHz

DAMPING FAC TOR:

350 minimum

INPUT IMPEDANC E:

20k  b a la nc e d b rid g ing

INPUT SENSITIVITY:

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 INPUT LEVEL:

9.75 vo lts (+22 d Bu)

SPEC IFIC ATIO NS

VERSIO N 1.1

RISE TIME:

< 4.4µs

SLEW RATE:

Vo lta g e Sle w Rate > 50V/ µs

> 100V/ µs b rid g e d

C urre nt Sle w Rate > 32A/ µs a t 2Ω

C MRR:

> 40 d B, 20Hz to 20kHz

LO AD ANGLE:

8(±jx) time ind e pe nd e nt a t 8Ω 4(±jx) time d e p end e nt, T > 6 min. a t 4Ω 2(1±jx) time d e p e nde nt, T > 2 m in. a t 2Ω

TRANSIENT RECO VERY:

< 1µs fo r 20 dB o ve rdrive @ 1kHz

HIG H FREQUENCY O VERLOAD AND LATC HING:

No latc h up a t a ny fre q ue nc y o r le ve l.

HIG H FREQUENCY STABILITY:

Unc o nd itio na lly sta b le d riving a ny re a c tive o r c ap a c itive lo ad .

TURN ON DELAY:

3 se c o nd s

LIMITER SEC TIO N:

C o mp le me ntary Po sitive a nd Ne g ative Pe a k De te c ting

INDICATO RS:

6 m e te r LEDs p e r c ha nne l

SIG (Sig na l Pre se nt), –20, –9, –6, –3, O L

(O v e rlo a d )

C H 1 & 2

PROTEC T LEDs SHO RT LEDs

TEMP STATUS

C O LD/ HO T LEDs

POWER CO NSUMPTIO N:

65 wa tts a t id le

900 wa tts w ith m usic al p ro g ra m fully lo a de d

(2 o hms p e r sid e , o r 4 o hms b rid g e d )

550 wa tts w ith m usic al p ro g ra m fully lo a de d

(4 o hms p e r sid e , o r 8 o hms b rid g e d )

850 wa tts a t full p o we r into 8 o hms

(c o ntinuo us sine w a ve )

1500 wa tts a t full p o we r into 4 o hms

(c o ntinuo us sine w a ve )

2500 wa tts a t full p o we r into 2 o hms

(c o ntinuo us sine w a ve )

AC LINE PO WER:

US 120VAC , 60Hz Euro pe 240VAC , 50/ 60Hz Jap a n 100VAC , 50/ 60Hz Ko re a 220VAC , 60Hz

VARIABLE LO W-C UT FILTER:

10Hz (Off) to 170Hz, 2nd Orde r Be ssel

SUBWO O FER LOW-PASS FILTER:

Switc he d : 63Hz/125Hz, 3rd Ord e r Be sse l

C O NSTANT DIRECTIVITY HIG H FREQ UENC Y BO O ST:

2kHz to 6kHz (+3 dB p o ints) 6 d B/ o c tave hig h-freq ue nc y she lving filter, (she lving o c c urs a t a p p ro xima te ly 30kHz)

AC DRO P-O UT VO LTAG E:

At a p p ro xima te ly 50% o f ra te d line vo lta g e

PHYSICAL:

He ig ht 3.5 inc he s (89mm) Width 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 are a lw a ys striving to ma ke o ur stuff b e tte r at Ma c kie De sig ns b y inc o rpo ra ting ne w a nd imp ro v e d ma te ria ls, c o m p o ne nts, a nd ma nufa c turing m e tho ds, w e re se rve the right to c ha ng e the se sp e c ific a tio ns a t a ny time witho ut no tic e .

SPEC IFIC ATIO NS

C IRC UIT THEO 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 lain the uniq ue c irc uits a nd a rc hite c ture. Samp les in this se c tio n will re fer 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.

INPUT C 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 INPUT BO 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 m o d e , the sum ming a m p (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 ga in c o ntro l o n the DISPLAY BOARD. Afte r the g a in c o ntro l, the sig na l is b uffe re d b y U7A, returne d to the INPUT BO ARD a nd ro ute d to the MAIN BO ARD via J16.

C ha nne l 2’ s inp ut sig na l pa th is e le c tric ally id e ntic a l to C ha nne l 1’ s in STEREO m o d e . In PARALLEL MO NO m o de 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 pe ratio 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 .

M•1200/M•1400 SERVIC E MANUAL

PO WER AMPLIFIER CIRC 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 utput with c o m p le me nta ry o utput d e vic e s. The m a in p o we 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 are mute d fo r 4 se c o nd s o n p o we r up a s C53 c ha rg e s via R203. Muting is a c hie ve d b y turning o ff Q73, re mo ving c urre nt so urc e s fo r the diffe rentia l pa irs. (Wa it a minute ! PAIRS? Re a d o n…)

An imme d ia te ly o b vio us d e pa rture fro m sta nd a rd d e sig ns is the Dua l Diffe re ntia ls a nd

Symme tric al Vo lta g e Am p 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 simple . 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 duc e so me d isto rtio n. Mo st a mp lifie rs use ne g a tive fe e db a c k to re duc e this p ro b le m (c re a ting a fe w m o re in the p ro c e ss). Ma c kie FR Se rie s a m p lifie rs ta ke a d iffe re nt a p p ro a c h. By using two c o m p le m e nta ry “ m irro r ima g e ” fro nt e nd c irc uits a ny d isto rtio n c ause d b y no n-line a r tra nsisto r c urve s is e ffe c tive ly c anc e le d o ut in the b ia s string , w itho ut fe e db 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 m p . The

Ba ke r C la m p 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 m p sc he m a tic , Q27 is a c o m m o 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 dio d e dro 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 drive r tra nsisto r Q 28 (D3, D2, Q29V se e a vo lta g e g re a te r tha n o ne dio d e dro p b e lo w the +80V sup p ly, e ve n if the +80V supp ly fluc tua te s. Q 27 a lso drive s the lim ite r LDR LED U2A. The ne g ative sid e ha s the same c irc uit mirro re d .

). Q 29 will ne ve r

b e

C IRCUIT THEO RY

VERSIO N 1.1

PRO TECTIO N CIRC UITS

Re fe r to sc he ma tic s o n pa g e s 27-29.

The M•1200/ M•1400 ha s two o utput 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 m p if the o utput d e vic e s a re lo a d e d b e yo nd the ir safe o p e ra ting a re a (SOA). 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.

SOA PRO TEC TIO N

The SO A p ro te c tio n c irc uit se nse s the vo lta g e dro p a c ro ss the e mitte r re sisto rs muc h like sta nd a rd VI c urrent 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 ed s ~1V. If the y a re o n fo r lo ng e no ug h to c ha rg e C38 (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 sw itc he s Q 79 a nd Q 78.

If SOA d e te c tio n is tripp 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 CRO WBARS

The DC Cro w b a r c irc uit pro te c ts spe a ke rs in the e ve nt o f a n o utput fa ilure b y b lo wing a ll rail fuse s. SC Rs Q 21-24 a re use d to sho rt the +/ - 80V sup p ly supp 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 m p a ra to r U4A (po sitive ) o r U4B (ne g ative ). The SCRs are the n fire d via d rive r tra nsisto rs Q87, Q 88.

NOTE: The LM339 c o m p a ra to r IC is use d e xte nsive ly in the M•1200/ M•1400. It diffe 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 pe n c o lle c to r o utp ut. If the vo lta g e a t the inve rting input e xc e ed 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. Othe rwise , the o utp ut is o p e n.

C IRCUIT THEO RY

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 utp ut de vic e s e ve nly a nd d o e s no t c o lle c t dust o n the c irc uitry. The fa n o pe ra te s a t two sp e e d s, c o ntro lle d b y the a m p lifie r. An LM35DZ mo unte d in the c e nte r o f the he a tsink p ro vide s te m p e ra ture info rma 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 CO 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 utp ut vo lta g e is p ro g ra m m e d b y the ra tio o f R209 to R211/ / R207 (/ / =p a ra lle l). Whe n the unit is p o we re d up C 83 c ha rg e s thro ug h R241 p ro viding a 40 sec o nd d e la y b e fo re the fa n sta rts. As C83 c ha rg e s, U6D’ s o utput switc he s to -16V, sta rting the fa n. The n U6A’ s o utp ut switc he s to o pe n, a llo w ing U6B to inc re a se the fa n sp e e d , if trig ge re d . R240 a nd C 82 g ive the fa n e xtra vo ltag e whe n starting .

The fa n sp e e d is inc re a se d b y U6B a dd ing R211 in p a ra lle l w ith R207. (Q 91 w a nts it’s b a se a dio d e dro 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 trigg e re d b y U4D to inc re a se fa n sp e e d if;

M•1200/M•1400 SERVIC E MANUAL

• C ha nne l 1 SOA p ro te c tio n is ac tiva te d (U5C ), O R

• C ha nne l 2 SOA p ro te c tio n is ac tiva te d (U5D), O R

• The he a tsink is a b o ve 60 d e g C ( U5B) A ND p ro g ra m is d e te c te d (U4C ), O R

• The he a tsink te m p 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 po 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 lding Q 89 o ff. Whe n p o w e 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 Q89’ s c o lle c to r fa lls be 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 rme r c o re te m p e ra ture will a c tiva te O VERTEMP. U5A a c tiva te s o ve rte mp if the LM35DZ de te c ts he a tsink te m p e ra ture a b o ve 80 d e g C . Fe e d b ac k re sisto r R137 re sc ale 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 efo re o ve rte m p is d e a c tiva te d . O ve rte m p c a n a lso b e a c tiva te d b y the p o we r tra nsfo rme r the rma 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.

C IRCUIT THEO RY

VERSIO N 1.1

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 all c o m p o ne nts a nd a sse m b lie s. Disasse m b 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 xplo d e d d iag rams in the pa rts se c tio n.

Se ve ra l imp o rta nt p o ints c o nc e rning the asse mb ly:

• 4 o f the sc re w s 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 iec e ) in p la c e . Whe n re mo 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 w s (750-050-04)

a re re p lac e d ne xt to the filte r c ap s. The la rg e r he a d m a c hine sc re w s c an a rc to the c ap a c ito r b o dy.

• Be sure a ll tywra p s a re re pla 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 UIPMENT LIST

• 30 MHz dua 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 8m V DC with a minim um o f 2 d ig its o f

a c c ura c y, a nd d o wn to .1Ω)

• Sine w a ve o sc illa to r / Func tio n g ene ra to r (20Hz - 20KHz)

• 4 lo a d re sisto rs (8Ω with a m inim um 500W p o we r ra ting )

• 10A / 120V Va ria c With AC vo ltm e 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 rang e )

• 0.1uF 400V film c a p a c ito r insta lle d a c ro ss dua l b a na na p lug

• 16 A WG sho rting jump e r installe d a c ro ss d ua l b a na na p lug

REC O MMENDED EQ UIPMENT LIST (PERFO RMANCE VERIFICATIO N)

• Disto rtio n a na lyzer 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 .

SERVIC E PRO C EDURES

M•1200/M•1400 SERVIC E MANUAL

TRO UBLESHO O TING TIPS - O UTPUT FAILURES

Afte r a c a ta stro phic fa ilure , it is like ly tha t the fo ur +/ -80V sup p ly fuses will b e b lo w n. Re p lac e fuse s a nd ve ry slowly b ring up the Va ria c while m o nito ring line c o nsum p tio n. It is like ly tha t sub sta ntia l line c urre nt will be p ulle d due to sho rte d o utput p a rts. At the same 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 w ill 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 utput o ffse t b e lo w +/ - 2V, o r te m p 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 utput tra nsisto rs. If o ne b a d o utp ut is fo und , re p lac e a ll e ight in the c ha nne l. Whe n a n o utput d e vic e sho rts it c an p la c e hig h c urre nt stre sse s o n the o the r o utp ut pa rts. The se o utput p a rts c a n fa il o ve r time . Sinc e lo ng te rm re liab ility is p a ra mo unt, ple a se re p lac e a ll the o utputs.

All e ig ht o f the 3W 0.22Ω e m itte r re sisto rs must b e ve rifie d fo r pro pe 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 utput tra nsisto r fro m “ d o ing it’ s sha re ” a nd w ill p lac e m o 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 and p re-d rive rs a re no t sho rte d . If

o ne drive r is sho rte d re p lac e it’ s ma te . Do the sa m e with the p re -d rive rs. Also c he c k a ll the re sisto rs surro und ing the drive rs and 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 m m o n to d a m a ge the se p a rts whe n the a mp lifie r fa ils in a sp e c ta c ula r w a y! Lo o k fo r sho rts o n Q76, Q77, 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 ause so m e o dd a symme tric al c lipp ing pro b le m s. O p e n p a rts will no t a llo w the c urre nt limiting to o pe ra te e ffe c tive ly. If p ro b le ms e xist in the se se c tio ns the amp lifie r mig ht fa il

into a sho rt, o r m ig ht c lip p re m a ture ly w he n lo a d e d to 2Ω.

All o f the a bo ve tro ub le sho o ting (No t inc lud ing p a rt re p la c e me nt) takes pe rha p s 15 to 30 m inute 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 bo ve , it will allo w 99% o f the a mp 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 an lea d to a frustra ting a nd time c o nsum ing re p a ir.

Slo w ly 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 utp ut is c e nte re d (no DC o ffse t). It mig ht b e d e sira ble 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 m p o ra rily so the a m p lifie rs are a c tive e ve n w he n the sup p lie s a re still ve ry lo w. If the a m p sta ys c e nte re d , ve rify tha t it will pa ss a nic e c le an sine w a ve . Re mo ve a ny te st jum p 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 atio n” se c tio n.

SERVIC E PRO C EDURES

VERSIO N 1.1

BIAS AND TEST PRO C EDURE

Afte r the unit ha s b e e n re pa 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 pre se nt, d isto rtio n spe c ific atio ns sho uld b e ve rifie d .

1. Ad justs bia s in b o th c ha nne ls (R1 & R51) fo r 8m V +/ - 0.3mV a t b ia s te st po ints (J53 &

J54) a fte r unit ha s id le d fo r a fe w m inute 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 (900mA 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 less tha n +/ - 50m V.

2. Ap p ly a 1KHz sine w a ve to the inputs 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 sym m e tric a l a nd und isto rte d . Drive the o utputs into c lipp ing a nd ve rify symme tric a l “fla t-to p p ing ” o n the wa ve fo rm.

3. Re d uc e o utput le ve ls, install 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 lipp ing be 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 ar a nd a t c lipp ing (p a ra sitic o sc illa tio n).

4. Re m o ve c a p a c itive lo a d ing a nd m inimize 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 bly in a unit tha t is func tio ning p ro p e rly.

5. C o nne c t the a m p lifie r d ire c tly to the AC line a nd c o nne c t a n 8Ω d ummy 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 sym m e tric a l c lipp ing . The o utput will c lip so m e w he re b e twe e n 120V - 140V p k/ p k de p e nd ing o n ho w stiff the line is. C lip p ing sho uld b e a s de sc rib e d a b o ve . Ad d the 0.1uF c ap 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 Cha nne l 1 a nd C ha nne l 2 with 2Ω. Clip p ing sho uld b e

symme tric al, we ll b e ha ve d , a nd o c c ur so m e w he re a ro und 80V - 100V p k/ p k. Ve rify tha t c lipp 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 utput 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 m o de a nd c o nne c t 4Ω lo a d ing to brid g e o utputs (a c ro ss

b o th “ +” o utp ut b ind ing po sts). Slip so me c a rd sto c k b e twe e n the he atsink-o utle ts a nd c ha ssis sid e s. Mo nito r o ne o f the o utputs 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 utputs and ve rify tha t a ll fo ur ‘ Sho rt” a nd “ Pro te c t” LEDs lig ht and the a mp lifie r mute s.

9. Re m o ve sho rt, mo nito r o ne o f the o utputs, a nd a d just fo r a 60V p k/ p k sine o utput

(450W o f o utput p o we r b rid g e d ). Afte r a fe w m inute s the fa n w ill be g in running fa st

(he a tsink a t 60°C ) a nd a sho rt tim e late r the a m p lifie r w ill mute (he a tsink a t 80°C).

The “ Ho t” a nd “ p ro te c t” LEDs w ill c o m e o n. Re m o ve c a rd sto c k a nd a fte r a fe w minute s the a m p lifie r will c o m e o ut o f m ute mo de a nd the “c o ld ” LED will re turn.

10. Disc o nne c t lo ad ing a nd re m o ve drive . Re c o nne c t a m p lifie r to Va ria c a nd c o nfirm

tha t the id le c o nsump tio n is ro ug hly 65W o r 900mA, a s b e fo re . C o nne c t the a m p lifie r to sp e ake rs a nd ve rify tha t it so und s OK w ith m usic .

SERVIC E PRO C EDURES

M•1200/M•1400 SERVIC E MANUAL

(THIS PAG E UNINTENTIONALLY LEFT BLANK), THO SE RESPONSIBLE HAVE BEEN PUT TO THE SWO RD

SERVIC E PRO C EDURES

VERSIO N 1.1

PARTS

Q UICK PARTS

FRO NT PANEL

GAIN/dB CH

2218

1 4

1.23v (+4dBu)

SENSITIVITY

PR OFE SS IO NA L POW ER AMP LIFIE RFULL S YMM ETRY D UAL D IFFER ENTI AL HI GH CU RRE NT DE SIGN

-3

-6

-9

-2 0

SIG

-3

-6

-9

-2 0

SIG

SENSITIVIT

2416

2 6

8 3 0

1.23v (+4dBu)

GAIN/dB

CH1CH

INTERNALSTATUS

PROTECT

SHORT

TEMP STATUS

1&2

COLDHOT

OFF

POWER

HANDLE ASSEMBLYS

RIG HT, 080-023-10 LEFT, 080-023-20 SC REW(TO C HASSIS),700-028-04

REAR PANEL

(MONO BRIDGE)

1200 WATTS

4 OHM LOAD MIN.

600 W A TTS CH

2 OHMS LOAD MIN.

120 VAC 50/60 Hz

1500 WATTS

AC LINE C ORD

US, 640-006-00 EURO PE, 640-007-01 JAPAN, 640-007-02 ENGLAND, 640-007-03 ITALY, 640-007-04 AUSTRALIA, 640-007-05 SWITZERLAND, 640-007-06

STRAIN RELIEF

740-004-00

INTERNA L FUSES

RAIL FUSES; 10A 5X20MM, 510-021-00 MAIN FUSE; 20A, 510-017-00 8A, 510-023-00

G AIN C O NTRO LS

5KL PO T, 130-036-00 KNOB, 760-061-00 NUT, 705-013-00

ALL LEDS

RED T-1, 304-001-00 G REEN T-1, 304-004-00

PO WER SWITCH

500-022-00

STAR WASHER, 710-023-00

CAUTION

MONO BRIDGE

SPEAKER OUTPUTS

SPEA KER O UTPUTS

BINDING POSTS, 400-119-00 BINDING POST SCREW, 700-011-00

CHANNEL

OFF

/ BRIDGE / MONO

LOW CUT

FILTER

TYPICAL

35 Hz

STAGE

MONITOR

100 Hz

170 Hz

CONSTANT DIRECTIVITY

HORN EQ/AIR EQ

4.5

6k Hz2k Hz AIR EQ

BALANCED

INPUT

O RUNBALANCED

OFF

TYPICAL

STEREO TYPICAL

OUTPUT APPLICATION

FULL

RANGE

(

CH1 & CH2)

LIMITER

STEREO TYPICAL

AMP MODE

MONO BRIDGE

OFF

WOOFER

SUB

FREQUENCY

125Hz

63Hz

INPUT SEC TIO N

ALL KNO BS, 760-048-04 LO W CUT, 50KZx2 POT, 130-017-02

INPUT

THRUTHRU

BALANCED

UNBALANCED

TYPICAL

O R

OFF

CHANNEL

CONSTANT DIRECTIVITY

HORN EQ/AIR EQ

LOW CUT FILTER

TYPICAL

35 Hz

STAGE

MONITOR

100 Hz

170 HzOFF

4.5k Hz

6k Hz2k Hz AIR EQ

AIR EQAIR EQ

C D HO RN EQ , 10KC PO T, 130-037-02

M• 12 00 / M•1400i

¼” JAC K, 400-118-00 WASHER, 710-019-00 SLOTTED NUT, 705-015-00

M• 14 00

SPEA KON, 400-138-00

SC REW, 700-055-00

¼” INPUT JACK, 400-214-00 ¼” JAC K WASHER, 710-002-00 ¼” JAC K NUT, 705-003-00

MALE XLR JAC K, 400-142-00 FEMA LE XLR JAC K, 400-141-00 XLR JAC K SCREWS,700-055-00

DP3T SWITC HES, 500-023-00 DPDT SWITC HES, 500-024-00

PARTS

C HASSIS ASSEMBLY

M•1200/M•1400 SERVIC E MANUAL

1 7

16 17 18

PARTS

VERSIO N 1.1

C HASSIS ASSEMBLY PARTS LIST

ITEM # PART # DESCRIPTIO N NOTES

1 700-028-02 SEMS 6-32X3/ 8 PHP BLKZC ALL SIDE PANEL SCREWS

2 550-221-00 TO P C O VER - M1200

3 700-041-04 MC H 6-32X3/ 8 FL 100DG BLK TO P C O VER TO CHASSIS

4 551-029-00 EXTR SC RN DSPLY BZL-M1200

4 551-029-10 EXTR SC RN DSPLY BZL-M1400

5 700-041-04 MC H 6-32X3/ 8 FL 100DG BLK MANIFOLD TO FA N

6 550-277-00 SC REEN MANIFO LD - M1400

7 550-223-20 SIDE RAIL LEFT - M1200

8 550-223-10 SIDE RAIL RIGHT - M1200

9 550-222-00 BTM C OVER - M1200

9 550-244-00 BO TTO M COVER - M1400

10 080-023-20 PNT HANDLE ASSY LEFT

11 080-023-10 PNT HANDLE ASSY RIG HT

700-028-04 SEMS 6-32X3/ 4 PHP BLKZC HANDLE ASSY TO CHASSIS

700-041-04 MC H 6-32X3/ 8 FL 100DG BLK HEATSINK TO C HASSIS BO TTTO M

12 TRANSFORMER / MO UNTING

600-016-00 XFMR M1200 120V

600-016-01 XFMR M1200 230V

600-016-02 XFMR M1200 100V

705-019-00 NUT HEX 5/ 16-18

710-017-00 WASH SPLTLC K 5/ 16 HEAVY

710-024-00 WASH FLAT 5/ 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 INSUL MYLAR INPUT SHIELD

15 055-079-00 PCB ASSY INPUT 1200/ 1400

16 700-028-02 SEMS 6-32X3/ 8 PHP BLKZC INPUT PC B TO SHIELD

17 760-048-04 KNOB 9MM DARK G RAY

18 550-275-00 SPAC ER PLA TE - AMPLIFIER

710-002-00 WASHER FO R ¼” JAC KS

705-003-00 NUT FOR ¼” JAC KS

700-055-00 MC H 4-24X3/ 8 PHP BLK HILO XLR JAC K SCREWS

055-080-00 PCB ASSY DISPLY 1200/ 1400

055-081-00 PCB ASSY MAIN - 1200

080-072-01 PCB ASSY MAIN - M1400

080-072-02 PCB ASSY MAIN - M1400i

700-028-02 SEMS 6-32X3/ 8 PHP BLKZC MAIN PC B TO CHASSIS EXCEPT FO R:

700-050-04 MC H 6-32X3/ 8 FIL PHL C LR ! USE THESE NEXT TO C APS !

700-011-00 MC H 4-40X1/ 4 BTNSKT BLKO X O UPTUT TERMINALS TO C HASSIS

710-019-00 WASH FIBRE BLK (W/ JAC K)

705-015-00 NUT SLOT NC KL

700-055-00 MC H 4-24X3/ 8 PHP BLK HILO

PARTS

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