ADC SS 450X BSR EQ 5000 Service Manuals

Page 2

A lull ms?

1. Apply a sinewais an Hz and 7 kHz
mixed 4:1 to input JackleINE, TAPE»
1. TAPE-2), measure the IMD of the
outputs at the output JachstLINE.
TAPErl. TAPE-2D.

Verify that it does not exceed the
limit of 0.00E 9L.

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x MAXIMUM OUTPUT VOLTAGE TEST

1. Apply a sinewsve from 20 Hz to 20 kHz
to input jacks(LINE, TAPE-l. TAPErZ).
measure the output voltage at the
output jocksrLINE. TAPE-l. TAPE-2L
Verify that the output voltage is
more than 50 Vrmss

THD is 1 x
Frequenc output(v)
20 Hz more than 5.0
l kHz more than 5.0
20 kHz more than 5.0

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ADJUSTMENT AND TEST PROCEDURES

EEIORE enJlSTIhG AND TESTLVG

x Allolv a minimum of lo minutes harmrup x
For the test equipments and the unit
under test.

x Maintain rated ac line voltage.

INSTRUMENTS REQUIRED

1 De volt meter
t vacuum tube voltmeter
x Audie signal generator

Before EdJustxng, confirm that the
regulated 1 5 \'dc. t 12 Vrlo. +43 vac.
7.5 Vac supplies operating correctly.

Oscilloscope
Digital voltmeter
Frequency counter

SETTING THE SWITCHES AND CONTROLS

REC switch r.
EQ sulteh ...
DUEBING selector
MONITOR selector
RTA selector rr.i L + R position
HOLD switch ... .. OFF position

STEP selector ii.r,..i. 2 on position
METER SENSKTIVITY rr,.. Max. position

. OFF position
ON position

SOURCE position
SOURCE position

i PINK NOISE OUTPUT ADJUSTMENT

1. Connect the test Equipment to the
unit as shown in Fig.2.

2- Set the PINK NOISE switch to mil

3. Adlust the semievsrlsole resistor
swam so that the loo ml; is obtained
at LINE OUT Jacks

Centerla dB)

position

Max. position
OFF position

OFF position

LINE position
OFF position

Max. position

EQ slide levers

ATTenunter control
PINK NOISE switch .
SUBSONIC switch t..
LINE/MIC selector ..r
Reverb switch .
Depth control .ir..

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1. with a o oav sinewave applied to
input jacks(LIN.. TAPE-l, TAPEoZl.
Verify that the ouputs at the output
JackstLINE, TAPErl, TAPE-2) is as
shown for the following frequencies:

UNE w

Frequency outputlv)
20 Hz : l dEV

1 kHz : 1 MW

20 kHz 1 l dEv
vIvM

2n ihi

Fig. 3

l CENTER FREQUENCY TEST

1 Apply a sinewave to LINE IN Jack so 7" " 7-1
that the ouput voltage at the LINE CE"EF fre Deelec° T015
OUT jack i51.0 V. '7 V
2. Move esch slide levers from 0 dB to 1'5 Z 1 1° * 23'434'7 1 1
+15 dB position severally. 53 7 i 1,0 " 55'759-3 2
3. Tune the audio signal generator 25 Z 1 1° * 113'139 "2
frequency for maximum ouput voltage 25 Hz 2 10 x 225-275 HZ
is ohtained at LINE UUT Jacki 50° 1 1 1° 50'559 3
1 kHz 2 10 x o 9-1.1 kHz
2 kHz 1 IO X 1-8-2iz kHz
4 kHz 1 10 X SIG-4.4 kHz
5 kHz 1 In % 7.2-8.8 khz
15 kHz 1 10 * 14.4-17 5 kHz

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x SPECTRUM ANALYZER ADJUSTMENT

1. connect the test equipment to the
unit as Shown in Fig.3.

2. Apply a 5 mv, 1 kHz sinewote to both
left and right LINE INPUTS.
Adjust the semlevarlable resistor
SVRZDl so LhnL the first segment on
the 1 kHz range or average range is
Just on.

x REVERE CIRCYJIT E.E.D BIAS ADJUSTMENT

1. connect the test equipment to the
unit as shown in Fig. 4.

2 Apply a 1.5 v, 1 kHz sinewave Yrom
Tm.

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v ka UN u
5 mV

Fig. 3

3. Adjust the Semi-variable resistor
SVRTOl so that the waveform of TF5 is
symmetrical clipping. At this time,
you may adjust the input voltage for
easy to see the clipping condition or
waveform.

usolmstope

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5 V mu m

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to I95

x nIsToNTIoN TEST

1. Terminate the output jaclelNE, TAPE-
1, TAPErZ) with 10 kg in parallel
with 1000 pE to grounds

2. Apply a sinewsue to the input
jacks following frequencies. measure the
Total Harmonic Distortion of the
outputs at the output jackleINE.
TAPE-l. TAPE-21.

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(LINE output voltage is L0 Vnns)

THU)

below 0.008

Frequency

helaw 0.003
below n 003 l
LJ

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2a H: l kHz 20 m1

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