Crown Studio Reference I Manuel de service

PROFESSIONAL STUDlO AMPLIFIERS Studio Referenc dio Referenee Some models may be exported under the name Asrr@rou@ O "99 8by Crown Ir~ternatit:,na

Sf ~dio Reference Service Manual This pa@@ intentionally left blank introduction 4 -2

Studio Referenee Service ,Msnual The following specifications on Bode Wajsctlon [CMR): Better than 100 dB be- Mode, with an 8 Ohm load, a ted full ban

Enable: A front panel push button used to turn the Stereo mode wid)~ both ~haanneIs driven: amplifier on and off, 1,190 watts per channel into 4 ohms.

Dynamic Ranga/Lsuel Meter: Each Channel has a five- segment meter that displays either the dynamic range of the output sigrrai in dB sr the output lov

Studio Reference Service ManuaI This page inten&ianally /aft blank

Studio Reference Service Manual age Convers The Studis Reference Ampfifiers can be wired for 100 VAC? I20 VAG, 200 VAC, 220 VAC or 240 VAC opera- tion

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Studio Reference Service Manual INVERTING LOW SIDE BRIDGE OUTPUT BWUNCE PNP STAGE Circuit Theory 4-1

Bcrcrurn. , , , Sfudjo Weference Service Manual --,-..-.- -.".- ..,. ".,- R~K 0 - k to interrupt around lw~=os via the Ground " - St

ence. Their outputs drive their respechive tVA, muting transistors, The QQEP transistors steal drive as dictated by th@ BDEP circuitry or shunt the au

@Krawn" --,,, Stlidio Refgrence Service Manual , , , .-. -""..."" R~K 6 *-...- The information furnished in this manual do

Figure 4.3 is a simplified exampfe of the grounded bridgs output topology. It consists of four quadrants of three deep DarDington (composite) emitter-

E ! t Rev 0 k -..,- ,,. , Sfudio Reference Service Manual @CraUme rn I k72VDC statically) is capable of produsing 288V rent (negative amplifi~r output

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and power is applied diractty to the transformer. 4,9.3 Signal Indlcatlan 4,8.3 Over Voltage Proteetion Ul El serves as a window comparator for the pu

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R@K 0 ----..., ...- - ,,, ,, , -...I...YIIIIIIIIIIllllYllllllYl Studio Reference Service , , ,, Manual -.,- mcrmwn* Checkou Procedures t8,9 -10.

Gheckou Procedures 5.9 Voltage Gain Spee 2666 Gg%n; Gain of 20,8 k3%. Spac 0.775V 5e~%itlvi~: REF I ."---Gain at '508.65 &3%, REF !i -~~

Checkau Procedures 5.13 Crosstalk Prccedure Shed: inject a 6Q Hz sine wave. REF I out- s~@@: -6048 at 20 kHz, put level = 46 VAC. REF I! output fewel=

Checkou Procedures 5,16 ODEP Limiting 5.17 Mute and Turn On Delal Spss: No ascillatisn on ODEP Limiting wave form\ Sp@@: Clamps signal; 3 ts 5 second

R~K Q Studio R@f@f@n@e Service Msnuaf - -.-. "... <..."<. --"<,."...--- , , - @crownq I i f Checkou Procedures 5

Rev. Q 12-98 Initial Printing

This page intantiarmally ieft blank Electrical Checkout 5-6

6 Schema Schematics 6- 1

Phis page intentionally left bblank Schematics 6-2

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1 2 3 4 5 6 9 8 9 10 3 1 22 13 14 25 16 3 7 18 19 20 21 22 23 24 Not Shown 25 $crew, 8-32 x .75 FLSHD End Cap Handls Screw, 8-32 x 0.5 FLTHD Main Chas

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Parts information 7-5

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Studio Reference Service Manua f -- Screw, 8-1 8 x 1.375 PNWD 8$1018%10822 Main Madufe Spacefx 375 Toggle Nut Plastic Board Support, 7$8 Lock Screw, 6

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@Crownx Studio Reference Service Manua$ -...- ,,, ,, , ,, ,,, ,, --,-." .,...p" Rev+ 0 pu..,"-

Back Pane Bask Panel Plate Shield, Circuit Breaker Screw, 8-32 x 38 PNHD Screw, 6-32 x .25 WasherE W6 lnt, Shar REF I Circuit Breaker$ 30A REF I! Circ

SCYGW, 8-42 x "332 TI5 NPN Power Transistor$ REF I NPN Power Transistor, REF II PNP Power Transistor* REF I PNP Power Transisto6 REF II Meatsink

Pa& Infarmalion 7- 1 2

Rev" 0 -- * -,--,,,.. "... ,,- , , Studio Ref@r@bac@ Service Manual %--.".,- - , , @croum* P -* - Capacitor, 6300y F 150V (REF 9) Capa

Parts informahian 7-1 4

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Studio Refereace amplifi- output module built on PC board P10423- ers, there has been several updates and revisions. list: af madules is comptete up t

Rev 8 - . .- Studio Reference Service Manu3l @crown 1 Bntroductisn ...

. . . E 100/200 C 9857- 1 Wed LED J5/F5 EIQ1/261 G9857-1 Wed LED J6/F6 HW16 C 8812-7 5.5" Cable Tie A5 HW17 C 88 3 2-9 5.5" Cable Tie B5 HW4

$tud8'8 Refe:rt;1sA)~e Service ManuaI 8 Madu R 124/Z2 410266-682t 6,8K 5% 91/A1 R125/225 AI0266-1011 1005% 02/A2 8126i228 A10266-1811 1005% Q2

R530/630 A10265-16821 1 OK 7 % W53 9 j63 1 8'1 0266-493 "19K 5% MC7915CT G% W532/632 A10265-1002U OK 1 % R533/633 A 10265-3 QQ2"i "

This page intentionally left bDank Maduie Information 8-6

Rev" 0 8 Modu ormation

12 Pin Header J3 "'UP47 NPN 14 2SC4029 NPN E5 2SA1559 PNP J5 C05 C 6806- 1 .Q1&aF 186V 34 2SC4029 NPN G5 COG C 6886-f .OfgF10OY G4 2SA15

R43 A18268-5101 51 5% R44 A10266-2021 2K 5% R45 A1 8266-751 1 750 5% R46 --- Not tlsed --- 847 --- Not Used --- R48 --- Nat Used --- I 6 Ohm Jrnp O Oh

Module In.lormatisn 8-10

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... ... " 5 Electrical Checkout and A

@CTaWm8 Studio R@fef@nce Service M38-sua$ ---."..- --- Rex 0 I S -25 Tab HI "25 Tab HI 25 Tab 11 25 Tab 1% REF Control Module infarmation 8-

Module information 8-13

R@K 0 Studio Referenee Service Manual 1 N4004 1 N4084 1 N4004 1 N40Q4 1 N4084 f N4084 1 N4004 ^4 N4804 1 N4064 IN4148 1 N4004 1 N4148 f N4148 1 N4I4$

52 6 7325-1 BPDT 62 PC Board D 8853-0 LM339 C4 f 4 Pin Socket @4 MCSBl5CT E2 MC7915CT E5 MOC3011 F4 -25 Tab HI "25 Tab HI 25 Tab I1 25 Tab I &quo

8 Modu nformation

R~K 0 . , Studio Reference Service Manual --- @Grown" 88 843504-2 Gontrgl Mod@!@ Pa@% kist HWI HW2 m&t& HW3 C? 4-6 .JpF 56V HW4 C2 C 6096

R6 A10265-"to031 lOBK 1Yo R7 Af 8266-3331 33K 5% R8 --- Not Used --- R9 A10266-3924 3.9K 5% W10 Af 0266-2221 2.2% 5% W1"S A"19266-2221

- OVER VOLT AGE CUT gaFF r--------- I i

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Studio Reference Sewice M~nual @ CraWms 8 Modu ormation Module lnfsrmatisn 8-22

-- R"14/244 A1 0266-47"i 470 55% K5/85 R1458245 A10266-4713 470 5% J6/E5 W1461246 A10265-11821 t1,8K 1% 04804 R 147j247 G 5868-2 0 OHM 05/05

A102@6-6$21 6,8K5% O"I/Al A10266-1011 106 5% 02/A2 Al0266-1011 7005% 821A2 Al0266-6821 6,8K5% N3/A3 A10266-1331 13K5% N2/A2 At 0268-1 041 7 OOK 5

@crowne P -..".. ...- , , , , Studio Reference Service pw Manusf R~K 0 P P Figure 2.1 Studio Wefsrence Dimensions ...

8 Modu ormation Module Information 8-32

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8 Ohm Jrnp O Ohm Jrnp 0 Ohm Jmp O Ohm Jrnp O Okn Jrnp O Ohm Jmp O Ohm Jmg O Ohm 3mp 0 Ohm Jrnp 6 Qhm Jmg 0 Ohm Jmp 0 Ohm Jmp O Ohm Jrnp 6 Ohm Jrnp O Q

8 Modu nformation NPN A@@ Rag $ Figure 8.9 04338Q-8 Bu$ut Mod~& M2p Module Information 8-33

5fudi~ Refgrenc~ Service Manual R43 A1 0266-2231 22K 5% A1 0266-821 1 820 5% M%Bll W44 A1 0266-223 1 22K 5% A"i066-"I221 1,8M 5% 12 W45 A1 6

Module lnformati~n 8-38

t .I Ths Studia Referenee The Studio Reference amplifiers are the flagship sf Crown Internatfsna\. They oRsr the best in sound re- production with a d