Stage Accompany PPE-2410 Manual de usuario

stageaccompany

PPE-2410

Programmable

Parametric

Equaliser

SERVICEMANUAL

Cont

ents

Safetyand

warranty 2

1.1 Safety 2

1.2 l{arranty ......2

Description

of the equaliser. 5

Takingthe PPE2410

apart.... 6

Basic

diagram. I

Basic

operationof the electronics .....10

5.1 Theinput / output board .....10

5.2 The

boost

/ cut board ...11

5.3 Thefilter board ...12

5.4 The

clip andlevel detection board.

....14

5.5 The

processor

board.... ......16

5.6 The

front board.... .....16

5,7 Thefront control board ....,.17

5.8 Themother

board ...17

5.9 The

power

supplyboard .......17

Circuit layouts.... .....18

Basic

operatíonof the software.. ......45

Downloading

of the software.. .....51

Adjustments... .....52

Final tests ...54

Specifications. ,...57

Serial boost/cutboard

(supplement

1)... ....58

New

operationalamplifier (supplement

2). ... .....67

Power

supplyupdate

(supplement

3) .....68

This manual

containsconfidential information.

Anyform

duplication is prohibited !

page:

date:

issue

2I-r2-1988

1 Safetvandwarranty

1.1 Safety

-l{arning

Inside the PPE2410,

ACvoltages

up to 240V may

be present !

-Connection

to the mains

voltage

The

PPE

2410's

chassisis connected

to ground

by the grounding

conductor

in the pou,er

cord. To avoid electrical shock,

plug the

power

cord into a properly

wired receptacle.Víhenthis ground

connectionis not present

or interrupted, all accessible

parts of

the equaliser

can

causean electrical shock.

-Fuses

To avoid fire hazard,

only replace

fuses

by the same

type and

vaIue.

-Servi

not perform

internal serviceor adjustmentsunlessthere is

another

person

present,

capableof renderingfirst aid and

reanimat

ion.

Try to perform

aII service

work

with mains

power

off. Remove

mains

plug to be sure that there are no internal voltages

present.

1.2 l{arranty

SUMMARY

StageAccompany

warrants

to the original commercial

purchaser

eachnew

Stage

Accompany

product, fromthe date of purchase

by the

original purchaser

until the endof the warranty

period, that the

product

is free of defects in materials

or workmanship.

WARRANTY

PERIOD

Thewarranty

period on all Stage

Accompany

products

is five years

from

the date of the first consumer

purchase,

with the exceptionof:

- all electrical products:

three years

fromthe date of the

first consumer

purchase;

- coneassemblies

in the loudspeaker

anddiaphragmsin the

CompactDrivers: Sl9g fromthe date of the first consumer

purchase;

PPE 24LO

SERVICE MANUAL 2

PPE 24LO

SERVICE MANUAL

pa$e:

date:

issue:

2I-te-r988

- movable

parts, such

as castors, locks, handles,hinges, fans,

etc: one

year from

the dateof the first consumer

purchase;

- computers

and

associated

peripherals: six months

fromthe

date of the first consuÍner

purchase.

HOI{TOVALIDATE

THEWARRANTY

To validate víarranty,

fill out the enclosed

warranty

card and

return it to stageAccompany

within ten daysof the purchase

date.

The

purchaser

must

always

keepthe original bill of sale to

establish the date of purchase.

ITEMS

EXCLUDED

FRO}TWARRANTY

Appeal

on warranty

will be voidedin case:

of defectscaused

by influencefrom

the outside, accident,

misuse,

neglect

or influence

of water;

- the serial number

on the warranty

and/or

product

has

been

defaced,

altered or removed;

- of damage

due

to shipment;

- of damageresulting from

neglection

of instructions listed in

the user manual;

- of damage

caused

by incorrect, abnormal

or abuse

during

delivery;

- the unit has

beenrepaired

(or shown

signs of repair) by

someonenot authorised

by Stage

Accompany;

- if the warranty

registration card has

not been

returned

StageAccompany

within 10daysof purchase;

- the original bilI of sale cannot be presented

whenever

warranty

service is required;

the cause

of damageis unknown

IíHAT

ríE I{ILL DO

Shipment

of the product

to a StageAccompany

dealer is at the risk

andresponsibílity of the customer.

StageAccompany

will pay

all labour

andmaterial expensesfor all

repairs covered

by this warranty.

StageAccompany

will not pay the

cost of shipmentto the StageAccompany

dealer or to the factory.

However

StageAccompany

witl pay

the return shippingchargesif

repairs are covered

by the s,arranty.

PPE 24TO

SERVICE MANUAL

pa$e:

date:

issue:

2t-L2-1988

PPE 24IO

SERVÏCE MANUAL

pa$e:

date:

issue

eI-L2-1988

CAUTION

l{arranty

work

canonly be performed

at our authorisedservice

centers

or at our factory. Every

repair or attemptedrepair by a non

authorised

party will void the warranty.

StageAccompany

resêrves

the right to alter specifications without

prior notice.

3 Takingthe PPE

2410

apart

In most

servicing cases,it will be sufficient to remove

the

equaliserstop panel. After this you

will have

access

to aII the

boards.

First be sure that the mains

plug is removedfromthe receptacle.

Then

remove

the eight top panel

screwsand

four side panel screws

(fig 1). Nowthe top panel

canbe removedandthe motherboardwith

all the plug in boards

wiII be visible.

rl'---

r,if

littl

illl

ii L_

Fig 1 Topside of the ?PE2410

The

plug in boardscanbe taken

out just by pulling (fig 2).

Access

to the front andinput / output boardcanbe obtained

removing

the tv{o

screuísof the appropriate

bar at the side panels

the PPE2410.After removing

the bars the front or back

panel canof

PPE E41O

SERVICE MANUAL

page: 7

date: e1-Ie-1988

i ssue: I

taken out.

The motherboard

and the power

supply board can be taken out by

removingthe screwsthat lock themto the bottom panel. For the

power supply board an additional four screws that secure the power

transistors have to be removed

(see fig.3).

!]SPL,iY & 3!::!NS

Fis 2PPE2410 with removedtop panel

É.

íl

É.

cí

PPE 24LO

SERVÏCE MANUAL

pa$e:

date:

issue

2r-1e-1988

____t

-r

Fig 3Power

supply details

lÈïÈiixl

tïo l.ErE-

EqIEIISI.J DIGIT^L

ATTE}.TXTOR

PROCESSOR

CIRCUIT FRONT

CONTROL

CTRCUIT DISPLAYS& BUTTONS

CLIP & LEVEL

DETECT

ION

DI6ITA. I DTCITAL

^TTENATTn ES_!5!L_ I ATTElr.nTm

ISANETI a

IOUT I a

rr +-tl

l..&*l-r ll qrrPurGND

( LrFr

ffii F

SAJ€Í GND

LIFT

IMIDï

| qÍ

Íl€J

f-ïi--t

[-leËql

POWfR

SUPPLY MAINS

S\NI TCH

MAINS

FI LTER

BASTC

DIAGRAX PAGE

PPE

24TO

SERVÏCEMANUAL

page

date

issue

09-05-r

989

update I

5 Basic operation of the electronics

This chapter describes someof the key circuits of the PPE2470. The

completecircuit drawingscan be found on page 18 to 44.

5.1 The input / output board

The input / output board contains the electronics for the input

amplifiers, the bypass

relays, the output amplifiers, the MIDI and

the SAnetconnections.

The input amplifier is a straightforward opampdifferential

amplifier.

The amplifier provides for a 3 dB gain. Common

moderejection can be

trimmedwith TR2for low frequencies and with TRl for high

frequencies. See

page

52 for the exact adjustment

procedure. The

value of R4 is three times higher than R5 to obtain the same

input

impedanceat the + and - inputs (24k0 each leg).

o{í $ttr

Fig 4 Input amplifier

Both inputs and outputs are equiped

with reiays to provide full

bypass in case the power

of the equaliser is turned off.

The outputs are electronically balancedand have

a DC

servo

feedback. This feedback

provides for a Iow output offset.

The outputs are cross-coupled so that a shortcircuit of one output

results in a 6 dB extra gain on the other (transformer simulation).

Output symmetrycan be adjusted with TRS

and TR6. See page 52 for

the adjustment procedure.

The output board also contains the digital interfaces.

A SN75176RS422

driver provides the SAnet

interface.

MIDI,

is only buffered and the controller is located on the processor

board

PPE

24TO

SERVÏCE }'ÍANUIAL

page:

date:

i ssue

09-05- I989

: update I

OJTF1JT.

CTI1 OJTRJT

Fig 5Output amplifier

5.2 The boost / cut board

The boost / cut board contains the electronics to supply the filters

with the right amount

of signal and to add the filter output to the

original signal.

Each

of the two channels has its ownboost / cut board and figure 6

shows

the basic set up.

The input level is controlled by DCl and extra gain can be addedÍn

the feedback

network around

R13

and R14. The digital code at the

digital input of the DAC

determines

the attenuation of the circuit.

This level in dB can be calculated with the formula:

A=20*Iog n

4096

where n is the decimal value of the bit code. when

extra gain is

used, add 10 or 20 dB.

since the Ínternal resistance of the DA

converter influences the

overall gain of the circuit, R13, R14and R15

should be matched

the DA

converter. Page

22 contains a table where

the exact values

canbe found.

TheDAC

resistance

can

be measured

between

pins 1 and20 after

has

beenremoved

fromits socket.A condition is that you have

supply

the DAC

with a voltage

of 1.2V between

pins 3 (Gnd)

and

18 (vdd).

PPE 24LO

SERVICE },!{NUAL

09-05- I989

board and each board

7 shows

the basic

page

date:

issue: update I

FiS. 6 Boost / cut board set uP

Next the signal is fed to four DA

converters which provide the cut

signal for the state variable filters. In figure 6 only one (DC4)

shown

for the cut signal of filter 1. This circuit can provide a

gain factor of -0.89.

After inverting the signal with IC1-b, another four DAconverters

feed the signal for boost purposes

to the filters. The boost circuit

for filter 1 is shown

(DC8)

and this circuit can provide a gain

factor of 8.44,

Here again, aII the feedback

resistors have to be matched

to the

DAC.

The values can be found in the tables at page

24. The DAC

resistance can be measuredbetween

pins 1 and 16 after the DAC

has

been removed

from its socket. A power

supply is not necessary.

The original signal is added

with the filter outputs at the input of

ICZ-a. The polarity of the output signal of each

of the filters

determines

whether the signal is going to be boosted

or cut at a

certain frequency. The frequency is determined

by the filter

settings at the filter board

The output level is controlled by DCZ.

5.3 The

filter board

Eachchannel

contains four

configurat ion

is equiped

with its own

filter

state variable filters. Figure

of a state variable fi Iter.

Glu

Mtlr

PPE 24TO

SERVICE }ÍANUAL

pa$e

date:

issue

filter with DAC's

09-05- I

989

updat e

Fig.7 State variable

The boost and cut inputs (from the boost/cut board) are summedat

IC1-a. Next you find a circuit with 3 multiplying DAC's

and multiple

feedback. DCz

and DC3

are matched

and determine together with C9 and

Cl3 the center frequency

of the bandpassfilter. C9 and Cl3 are of

the samevalue. The centre frequency is given by the formula:

fc= 2.

where

Rdac

is the internal

digital code present at the

given by:

ntR6""'C

value of the DAC

digital input

). (which dependson the

The DACresistance is

Rdac :256

. Rfb

n Represents

the analogue

value of the digital code (oooooooo

= 0 to

11111111

= 255) and Rfb is the basic resistance of the R-2Rnetwork

inside the DAC.

The value varies between

5 and 1s k0 and the correct

values of the capacitors can be found in the tables at page

27.

DC1

determines

the O-factor and its value is given by:

I resistors that

table at page

31.

=Rdac'R3JR4

nffiRT

should be matched

to DCl can be found in the

PPE 24LO

SERVICE MANUAL

page:

date:

issue:

2L-L2-1988

5.4 The

clip and

level detectionboard

Themain

function of the clip andlevel detectionboard

(see

schematics

at page

33) is to interface analoglevels to the

microprocessor.

There

are two types

of interfaces, one

for Ievel

detection andone

for clip detection.

For the level detection, four analogue

signals (both the inputs and

both the outputs) are precision rectified (Fig 8) and

fed to an

analoguemultiplexer. After the multiplexer, eachof the DC

signals

is convertedin a digital code.

OIl IÀRJT

Fis.8 Precision

rectifier

The

converteris built aroundIC1, IC2andIC3. After the

multiplexer the signal is passed

to a buffer andcomparator

IC3

comparesthe input signal with the reference

signal produced

by DA

converter

IC1. This reference

level dependson the digital code

produced

by the processor.

Bymeans

of succesiveapproximation,

the

processor

determinesthe digital valuewhich

is closest to the

analogue

level with the formula:

D=Uin*256

D is the analog value of the digital code (00000000

= 0 and 11111111

= 255). U,o+ is the reference voltage (-10.24 Y) adjusted with Pl.

For the cIÍp detection, all possible places where

an overload can

occur are sensed

and fed to comparators.These

are:

The two inputs of the equaliser (an overload can occur when

10 or 20 dB extra gain is used).

- The four boost outputs of each channel (each filter can

provide 19.5 dB of gain).

PPE 24LO

SERVICE MANUAL

pa$e: 15

date: 21-I2-1988

lssue: I

Thefilter output summing

point (each

fÍlter can

provide

small amount

of boostat the samefrequency

causing

the

output to clip).

All signals are single sided rectified andattenuated6 dB

before

they are fed to the comparator.

The

comparatorhasoutputs on logic

level and

are interfaced to the data bus through74HC244

buffers.

ICl5 latches the control signals for bypass,input gain and

the

multiplexer.

PPE 24LO

SERVICE MANUAL

page:

date:

lssue

2L-12-1988

PPE 24LO

SERVICE }{ANUAL

5.7 Thefront control board

The

front control boardcontains

the drive electronics for the

displays on the front boardand

the circuitry to readthe position

of the switches.

All information

for the displays is sent serially to the front

board. Eachframe

contains

the informationfor onecolumn

(32 bits).

Eachtime data is written to a certain columnof leds or displays, a

read

anda write cycle is performed.

In the read

cycle, the "video int" level is lowand

the display data

is stored by the processor

into RAllIC9. The

processor

adressbuss

is passed

to the RAIIthrough

ICl andIC2. The

data contains32 bits

that are divided over 8 nibbles. The

data is stored into IC9

through

IC10-A.

In the write cycle, "video int" is high anddisplay control is taken

over completelyby the control circuit. TheRAl,{nibbles are

subsequently

loadedinto IC11

andserially transmittedto the front.

The

endof the cycle is detectedby ICS.

The

readout

circuit for the switches

comprehenses

IC12, IC13

and

IC14.

Thekeybuf

signals are normallyhigh. To reada row

switches,

oneof the keybuf

signals is madelow by the processor.

The

output of IC13

goes

low

andthe keycot

byte is transferred to

the data bus.

5.8 Themother

board

0n the mother

boardall interconnections

betweenthe various PCB's

are made.

It also containsthe decodinglogic for variouscontrol andchip

enable

signals.

5.9 The

power

supplyboard

The

power

supply

(page

43 and

44) is a straightforward regulated

supplywith 78 and79 series regulators.

The

5 volt supply

(mainly

for the digital circuitry) is extended

with a power

transistor to provide for a higher

current capability.

Its output is filtered to eliminate

processor

noise

out of the

supply

andmainsnoÍse

out of the processor

circuit.

pa$e:

date:

issue

2L-12-1988

5.5 The

processor

board

The

processor

circuit (see

page

35) containsa microprocessor,

power

down

protection, memory

and

the MIDI

controller.

The

processor

hasthree different kinds of on board

memory.

IC4 is

an EPROI'Iwhich

contains

the software

for starting the processor,

testing the other memories

anddownloading

the system

software.

IC3, a Flash

EPRO}I,

contains

the systemsoftware

andcanbe

programmed

through

SAnetwithout removingit.

ICSis a RALlwhich

contains

program

variables, e.g. the equaliser

control settings. This IC is provided

with battery backup

to save

the settings when

the mains

power

is switched

off. The

battery has

a life time of approx. 10 years.

IC7 and IC8 are protection IC's to save

is switched on and off.

IC6 is the MIDI controller which is the

MIDI and the processor.

0n the PCB,

R7and

C24are omittedand

Dl is replaced

by a 0 0

resistor. l{ith these

components,

the programming

voltage of the

flash EPROI/

canbe influenced.

5.6 Thefront board

The

front board

(seepage

37& 38) contains

the user interfaces:

buttons

anddisplays.

Boththe readout

of the buttonsand

the display drive are

multiplexed.

The

buttonsare scannedin the following víay:

AII keyrow

signals are normallyhigh. Keycol0 to 7 are normally

pulled'high'by the resistor networkA6. To read

a rorf,

of switches,

its keyrowinput is made'Iow'by the processor.

Every

button that

Ís pushed

causesa shortcircuit between

its row

and

its columnso

all of the columnsof the activated switchesare pulled low.

Unactivated

switchesIeavetheir column

high. AII keycol levels are

read

by the processor,

the next keyrowis made'Iow'and the same

procedure

follows. Bymaking

all the keyrow

signals subsequently

low, alI the buttons

are scanned.

The

displays are driven in a similar way.The

control logic on the

front control board

loadsthe data for a certain column

into the

shift registers IC3, IC4, IC7andIC1. After this is finished,

demultiplexerIC9

selects the right column.

Theregisters are Ioaded

again

aqd

the next column

is activated.

memory

contents whenpower

direct interface between

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