Quad 44 Service Manual

Page 1

QURD 44

service data

For Service Manuals Contact
MAURITRON TECHNICAL SERVICES
8 Chewy Tree Rd. Chinnor
Oxon OX9 40V
Tel:- 01844351694 Fax:- 01344-352564
Emailz- anqmnwmufitrmmm

Page 2

QURD 44 service data

Contents page
Introduction ................................................ 3
Test Procedure ............................................... 3
Test Equipment .............................................. 3
Anti RIAA Network ........................................... 5
Fault Finding V. . , j ..................................... 8
44 Functional Block Diagram ................................... 9
Input Selector M12428: ...................................... 1O
ISS 5 Overlay Diagram ................................... 10
ISS 4 8 5 Circuit Diagram ................................ 10
Modifications .......................................... 1 1
ISS 4 Et 5 Components List ............................... 11
Mother Board and Power Supply M12436 ....................... 12
ISS 4 Overlay Diagram ................................... 12
ISS 4 Circuit Diagram ................................... 13
I88 5 Overlay Diagram ................................... 14
ISS 5 Circuit Diagram ................................... 15
Modifications .......................................... l 6
Components List ........................................ 17
Disc Input M12515: ......................................... 18
[SS 4 Overlay Diagram ................................... 18
lSS 4 Circuit Diagram ................................. 18
lSS 5 Overlay Diagram ................................... 19
188 5 Circuit Diagram ................................... 19
Modifications .......................................... 20
Components List ........................................ 20
Moving Coil Disc Input M12542: ............................... 21
lSS 3 Overlay Diagram ................................... 21
lSS 3 Circuit Diagram ................................... 21
Modifications .......................................... 22
Components List ........................................ 22
TapelnputM12496:...H..........,...H. .................. 23
ISS 3 Overlay Diagram ................................... 23
lSS 3 Circuit Diagram ................................... 23
Modifications .......................................... 24
Components List ........................................ 24
Radio and Auxiliary Input M12511: ............................. 25
lSS 1 Radio Overlay Diagram ............................. 25
lSS 2 Radio Overlay Diagram ............................. 26
ISS 1 and 2 Radio Circuit Diagram ..................... 25. 26
ISS 2 Auxiliary Overlay Diagram ........................... 27
ISS 2 Auxiliary Circuit Diagram ............................ 27
Modifications .......................................... 28
Components List ........................................ 28
Tone Control Board M12512: ................................. 29
ISS 8 Circuit Diagram ................................... 29
ISS 8 Overlay Diagram ................................... 3O
ISS 9 Circuit Diagram ................................... 31
ISS 9 Overlay Diagram ................................... 32
Modifications .......................................... 33
Components List ........................................ 34
Miscellaneous Modifications ................................... 35
Miscellaneous Components List ................................ 36

Completed Sub Assemblies List ................................ 36

Page 16

QURD 44 service data

modifications

ORIGINAL ISSUE BOARD M12436 ISS 3

M12436 ISSUE 4

The printed copper loop surrounding the board identification number has been turned into a large copper pad. This is
to minimise the effects of earth loop hum.

The Green 3 way pin cluster has been removed and the holes enlarged to accommodate two spade type tags.

M12436 ISSUE 5 SERIAL NUMBER 12000

The board now incorporates a modified version of the relay circuit which had previously been fitted to the tone

control board. M12512 ISS 8.

The two types of relay are not interchangeable

The board is also fitted with modified connectors, C400, C401 change from 47n to 100n.

If a ore-serial number 12000 44 is to be fitted with an Issue 5 mother board the following instructions should be

followed

1. Remove and discard the relay H82 24V and transistors TRSOO and 501 from the tone control board,
M12512 lssue 8 or earlier.

2. Remove and discard the 2-way and 5-way connections between the tone control board and the mother board
Replace with new connectors soldered to the tone control board, using the same colour coding. The new
connectors complete with wiring may be ordered as Quad reference:

2-way O44CON2
5-way O44CON5

.\\

a g
g A
G 3
KEEN

o
u o a ELL): f,
g G l; MAWE
5 5 § Geey B

Fig. 18

3. Modify the existing 1vaay connector by cutting off the five teeth marked A. Remove the sharp comers at B, to
enable the connector to fit snugly into the mother board connector, with the white wire nearest the bottomof the
44.

When re-connecting the signal leads, maintain the channel identification, red is right and white is left. In the
connection between the output socket and the mother board. the white wire should now occupy the eyelet
closest to the 5-way connector

COMPONENT ALTERNATIVES:

TR4OO TlP32, BD242
TR401 BC441. BC440-6
TR402 BC461, BC460-6
TR403 TlP31. 80241
TR404 E5270. BC413C

16

- M

Page 20

QURD 4 4 service data

modifications

ORIGINAL ISSUE BOARD M12515 I85 4

Eoualisation is to IEC for which: t1 = 751w
t2 = 318m
13 = 3180,15
t4 = 7950113

COMPONENT EQUIVALENTS
1C3OO 1C301 - TDA1034, NE5534,

M12515 ISS 5 SERIAL NUMBER 12000

The circuit has been completely re-designed for manufacturing purposes. This module should only be used on 44s
fitted with mother board type M12436 ISS 5. Use with mother boards M12436 lSS 3 and 4 may result in severe

switch off thumps.
Equalisation is to RlAA for whichztl = 75,13

{2 = 31 811.8
t3 = aisops

DISC MODULE M12515 ISS 4 DISC MODULE M12515 ISS 5
Part No. Description Circuit Reference Part No. Description
C180PHL Capacitor 180p 0300, C301 C100NJS Capacitor 100nF 5 250v 832561
C10UOKT Capacitor 10p. 16V C304, C305 CiUSOKT Capacrtor 1.5;1. 10 Ten!
CU033JS Capacnor 33h C306, C307
CU150JS Capacitor .1511. 15% C308, C309 C2U20KT Capacitor 2.2M 10 16V Tant
CZUZOKT Capacitor 2.2;L 16V C310, C311 C2U20TM Capacitor 2.2V. 25V
C47P0KJ Capacitor 47p C312, C313, C33NOJS Capacitor 33nF 5 250V B32561

C302, C303 C47UOMT Capacitor 47p. 20 6.3V Tant
CU047ZL Capacitor 47h C314. C315 CGNBOKS Capacitor 6.8nF 10 400V B32560
R4K70J1 Resistor 4K7 5% R300, R301 DBC214C Transistor BC214C
R47KOJ1 Resistor 47K 5% R302, R303 DESZ70X Transistor 55270
R390RG1 Resistor 390 2% R304, R305 C180PKJ CanaCiIOr 1801) UP125 5181KB
R150KGi Resistor 150K 2% R306, R307 DO71CPX int Cct TL071CP
R9K1OG1 Resistor 9K1 2% R308, R309 25158 PCB Disc 12515 ISS 5
R10KOJ1 Resistor 10K 5% R310, R311 M12443A Disc Input Plate
R1KO0J1 Resistor 1K 2% R312, R313, PAM8634 Gold Board Socket

R318, R319 PO1124A Terminal Screw + Earth Symbol
R330RG1 Resistor 330 2% R314, R315 PSO5DNB Socket 5 pin DIN Angle Panel
R150RGI Resistor 150 2% R316, R317 PSPHONZ SOCKEt Phono Red AT7OONP
R1K20G1 Resistor 1K2 2% R320, R321 PSPHON9 Socket Phono White AT7OONP
RBKSOG1 Resistor 6K8 2% R322, R323 R1OOKG1 Resistor 100K 2 050
D5534AX Integrated Circuit NE5534AN lC300, IC301 R1OKOG1 Resistor 10K 2 050
PSOEDNB 5 Pin DIN socket SKSOO
LSC1001 Choke 1mH L300, L301

L302. L303 R150RG1 Resistor 150 2 050
S44D|LA DIL Switch DYS-4DS 5300 - 8303 R180KJ1 Resistor 180K 5 050
PAM8634 Gold Board Socket 1. 3. 4, 5, 7 R1K1061 Resistor 1K1 2 050
l12515A PCB Disc 12515 ISS 4
M12443A Disc Input Plate R330RG1 Resistor 330 2 050
PQ1124A Terminal Screw + Earth Symbol RSKOOGO Resistor 3K 2 033
PSPHONZ Socket Phono Red AT7OONP R470KG1 Resistor 470K 2 050
PSPHON9 Socket Phono White AT7OONP R47KOJ1 Resistor 47K 5 050
TC205PF Drive Screw 3/16 22 Sup Black R4K7OJ1 Resistor 4K7 5 050

R75ORG1 Resistor 750 2 050
S44DILA Switch 44 DIL DYSA4DS
TC205PF Drive Screw 3/16 2Z Sup Black

20

Circuit Reference
C3144 C315
C304 C305.
C306, C307
C310, C311
C316, C317
C308, C309
C302. C303
C312, C313
TR300, TR302
TR3011 TR303
C300, C301
IC300. IC301

1,3,4,5,7

R311. R313
R314. R315.
R318. R319.
R328, R329
R324 R332
R314, R315
R320. R322.
R326, R327
R321, R323
R330, R331
R316, R317
R300 to R307 inc.
R310 R312
R308, R309
$300 to 303 inc.

,re-w

Page 28

QUQD 44 service data

modifications

ORIGlNAL ISSUE BOARD M12511 - |SS1

M12511 15$ 2 at serial number 12000.

44's before serial number 12,000 were fitted with two radio input modules. One of the radio input modules has
been replaced by an auxiliary input module. The same printed circuit board is used for both radio and auxiliary
modules although the values of some of the components are different.

The auxiliary input module accommodates two types of input connector, DIN and PHONO.

ALTERNATIVE COMPONENTS

lC 200,201,600. 601- LM351 or TLO71.

RADIO/AUX. lNPUT MODULE

Pan No. Dascfipfion

C1OONKC Capacitor 100nF 10 250V 332561
C680NKS Capacuor680nF 10 100V 832561
PSOSDNB Socket 5 pin DIN Angle Panel
PSPHONZ Phono Socket Red

PSPHONS Phono Socket White

D071CPX lnt Cct TLO71CP

l12511A PCB Radio/Aux Board M12511 15$ 2
M12563A Aux. Module Front Plate
'M12445A Radio Module Front Plate
PAM8634 Gold Board Socket

R1OOKJl Resistor 100K 5 050

R1MO0J1 Resistor 1M 5 050

R2K20Jl Resistor 2K2 5 050

R390KJ1 Resistor 390K 5 050

R3K30J1 Resistor 3K3 5 050

TCZOSPF Drive Screw 3/16 2Z Sup Black

28

Circuit Reference

C600. C601, C200. C201
C602, C603. 0202, C303
SK600. SKZOO

SK601

SK602

ICZOO. IC201. ICBOO, lC601

1. 3, 4, 5. 7

R602. R603

R608. R609, R200, R201. R206. R207
R604. R605. R202. R203

R600. R601

R606. R607. R204. R205

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