Krell Industries KAV-250cd C Service Manual

THE LEAOER IN AUOIO ENOINEERINO

KAV-250cd Compact Disc Player

Service Manual

v99.0
September, 1999

Table of Contents

Specifications

Unit Test Procedure

Test Equipment Required

Preliminary Test Procedure
Burn-in Procedure
Final Test Procedures

HDCD® & CBS Test Disc Contents

2

3-5
3
3

4

5

Schematic Diagrams and Bill of Materials are separately attached

HDCD® is the registered trademark of Pacific Microsonics, Inc.

KAV-250cd Compact Disc Player Specifications

Frequency Response
20 Hz - 20 kHz +0.0dB, -35dB

Signal to Noise Ratio
103dB, "A" weighted

Distortion
20 Hz - 20 kHz -84dB THD

Power Consumption
30 W

Transport
Drawer Loading, mechanically isolated drive
mechanism featuring a linear drive laser
assembly

DAC
20-bit Dual Burr Brown .PCM-1702
devices

Analog Outputs
1 pair balanced via XLR connectors
1 pair single-ended via RCA connectors

Digital Output
1 SPDIF via RCA connector

Remote Control
Wireless Infrared

Dimensions
19w x 3.7h x 15d inches
48w x 9.4h x 38d centimeters

Weight
Unit
Shipping

18 Ibs., 8.2 kg

28 Ibs., 12.7 kg

2

1. Purpose

KAV-250cd Compact Disc Test Procedure

To verify proper assembly and functionality

2. Test Equipment Required

1 Fluke 75 MM or a 8085 A MM or equivalent (Digital Multi-Meter)
1 Hitachi V-212 Oscilloscope or equivalent
1 ATS-1 (Audio Precision Analyzer) or equivalent
1

Variac (Autoformer), 240 VAC output capable
1 Pacific Microsonics HDCD® Process Test Disc
1 CBS CD 1 Standard Test Disc
1

DAC Processor with Coaxial and Toslink inputs and sync lock indicator.

3. KAV-250cd Preliminary Test Procedure

a)

Visually inspect the KAV-250cd for all proper cable and hardware
connections. Set the KAV-250cd to the appropriate line voltage.

b) Set the Variac to the appropriate voltage position. Plug the Variac’s output AC

cord into the KAV-250cd. If no problem is found, turn off the Variac with the
dial still set to the proper voltage. Turn on again to reset the microcontroiler.

c) Observe that the Stand-by LED and the HDCD® LED illuminate momentarily.

The Display window will not illuminate until the Power button is pressed.

Press the Power button. The Stand-by LED will extinguish and the Power
LED illuminates. The Display window will illuminate the following: 0, track,
index, M, S.

d)

Make the proper balanced output connections between the KAV:250cd and
test equipment. Load the CBS test disc, .set track 1 to repeat and press play.
The Voltage. will be approximately 4 V on the output. Adjust the output for

4.000 Vrms with the corresponding trim pots for each channel.

Note: Use the Open/Close button to load the disc. Make sure the KAV-250cd

reads and displays the contents of the disc. After approximately 6 seconds the

Display window will stop showing the contents, and show the number 1 and 0:00.

e)

Use the Analyzer to check that the KAV-250cd conforms to the following

requirements:

.3

Balanced Output

Output Voltage = 4.000 V

THD@ lkHz <-85dB

Noise Low < -94 dB
Noise Low < -90 dB

(set bandwidth for THD @ 20 Hz - 20 kHz)
(DCO for all phases + 000.0 V +/- 5 mV)

Note:

Noise and THD are taken with reference to their output voltage.
Play track 1 for the Output Voltage Specification
Play track 8, index 1 for the THD Specification
Play Track 4 for the Noise Specification

f)

While monitoring the balance output for both channels, place the KAV-250cd
into the pause mode. The output will drop to zero and the Pause Symbol "will
illuminate. Take the KAV-250cd out of pause and the signal will return for
both channels and the Display extinguishes.

g)

Remove the balance connections from the KAV-250cd and make the proper
single-ended connections between it and the AST-1.

h) Remove the CBS test disc and then load the HDCD® test disc.
¯ Play track 1. The Voltage reading will be approximately 2 V.

¯

Play track 2. The HDCD® LED will illuminate, the output voltage is
approximately 4 V, or twice the voltage of track 1, the non-HDCD® track

played.

¯

Play track 1. The output Voltage will return to approximately 2 V and the
HDCD® LED will extinguish.

i) Confirm that the digital outputs sync locks with processor.

J)

Confirm all face plate buttons perform their proper, indicated operation.

Confirm remote control operation.

k) Remove the test disc and all connections from the KAV-250cd.

4. Burn-in Procedure

a)

Switch off tl~e unit and let sit for five or ten minutes. Turn the unit back on and

load the CBS test disc. Program the lS’ and last tracks of the disc and set disc

to the repeat mode.

b) Allow unit to sit, turned on for 1 day. Confirm functionality of all operation, s.

c). Proceed with Final Test Procedure.

5. Final Test Procedure

a)

Set the Variac to the appropriate voltage position. Plug the Variac’s output AC
cord into the KAV-250cd.Turn on the Variac and follow step c) through k)
the KAV-250cd Preliminary test procedure.

Note: Refer to the following requirements instead of step e) in the Preliminary

test procedure.
At step h), perform the HDCD® test, balance out.
Verify for proper single ended operation.

Balanced Output

Single-Ended

Non HDCD® Output Voltage = 3.950 V
< V < 4.050 V (Track 1 HDCD test disc)

HDCD® Output Voltage = 7.900 V
< V < 8.100 V (Track 2 HDCD test disc)

Non HDCD® Output Voltage = 1.975V A V

2.025V
HDCD® Output Voltage = 3.950V _< V _< 4.050V

Frequency Response (Use CBS test disc)
@ 60 Hz & 1 kHz +0 dBr ± 0.02 dBr

60 Hz: Track 7, index 1

1 kHz: Track 8, index 1
@ 10 kHz-0.1 dBr ± 0.03 dBr
10 kHz: Track 9, index 1.
16 kHz: Track 9, index 3

20 kHz: Track 10, index 1
THD (Same tracks as Frequency Res.)

@ 1 kHz _< -82 dB

THD

@ 1kHz<-82dB

Noise (Use Track 4 set to repeat, CBS)
Noise < -95 dB

(Test @ 10 Hz - 300 kHz)

Noise ._<-91 dB

(Test @ 10 Hz - 300 kHz)

Note: DCO for all phases = 0.0V ± 6 mV

5

=

a)

1
2
3
4
5
6
7
8
9

Pacific Microsonics HDCD® Process and CBS Records CD-1 Test Disc
Contents

Pacific Microsonics HDCD® Process Test Disc Contents (by track number)

Non-HDCD® 0 dB FS, 1 kHz, Reference Tone
HDCD®maximum steady state level, 1 kHz tone

Non-HDCD® -14 riB, 1 kHz tone

Non-HDCD® -14 dB, 1 kHz tone, version 1

HDCD® -14 dB, 1 kHz tone, version 2
HDCD® -14 dB, 1 kHz tone, version 3
Non-HDCD® -74 dB, 997 Hz tone
HDCD® special DC test, version 1
HDCD® special DC test, version 2

b)

CBS Records CD-1 Test Disc Contents (by track number)

Reference L & R
0dB, 1 kHz

2 Left Separation, 0 dB

1 K, 125, 4K, 1 OK, 16K Hz

3

Right Separation, 0 dB
1 K, 125, 4K, 1 OK, 16K Hz

4 Signal/Noise L & R

Infinity Zero w/o emphasis

5 Dynamic Range, L& R

1 kHz, -60 dB w/o emphasis

6 Frequency Response

L& R, 0dB, 4, 8, 17, 31 Hz

7 61,127, 251,499 Hz
8 997,1999,4001,7993 Hz

9

10,007, 12,503, 16001, 17,989 Hz

10 19,997 Hz

(Also used for pitch error)

11 Sweep Frequency Response

0 dB, 5 Hz - 22.05 kHz

12 De-emphasis Error, L&R

1 K, 125, 4K, 10K, 16K Hz

13 Intermodulation Distortion

(SMPTE, Twin Tone) L&R

60 Hz + 7 kHz

14 Wow and Flutter, L&R

0 dB, 3150 Hz

15 Access Time, L&R

0 dB, 317 Hz

16

17

18

19

20

21

Square Waves, L&R
0 dB, 1,002.27 Hz

Impulse & Polarity Test

0 dB, L&R ~-

Linearity, 997 Hz, L&R

0 dB, -1, -3, -6, -10, -20,.-30, -39.99,

-49.97,-59.94,-70.31,-80.77,-90.31 dB
Linearity with Dither

997 Hz, L&R
*-70.31, -80.77, -90.31, -100 dB

Fade to Noise w/Dither, L&R
* -60dB, 500 Hz

Monotonicity, L&R
t t ,102.5 Hz 10 LSB

Additional Test Tracks

6

THE LEAOER IN AUOIO ENGINEERING

KAV-250cd Compact Disc Player

Service Manual

Schematics and Bill of Materials

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DATE

ii12/98

2124198
2126/98

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KRELL Industries, Inc.

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KRELL Industries, Inc.

TITLE

DAC

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820035\DSCH SHEET 4 OF 6

4,6 ÷I5V

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4.0V RMS DIFF

Addition of Capacitors are
to correct overshoot seen
on square wave @ 20 kHz

TITLE

DRAWING NO.

KRELL-Industries, Inc.

RIGHT OUTPUT

8200 35\DSCH

SI~KK’~; 5 OF 6

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KRELL Industries, inc.

TITLE

’ LEFT OUTPUT

DRAWING NO..

820035\DSCH SHEET 6 OF 6

|
|
|

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Sub Assembly
Pad No

1990095
1990095

1910959500100
1910959500100

Sub Assembly Description

KAV-25’0cd
KAV-250cd

KAV-250cd PARTS SUPPLI

KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100

KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
i910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KA~/-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI
1910959500100 KAV-250cd PARTS SUPPLI

1990095950100 KAV-250cd PARTS BOUGHT
1920330950140 KAV-250cd TRIMPLATE

Component No Component Description

1910959500100 KAV-250cd PARTS SU PPLI
1990095950100 KAV-250cd PARTS BOUGHT

1422601000060
149000004022
1580055000044
1701110200790
176121100033
178702400001
1840904400230’
1869595000095
1920330950140
1920540950105
194000000000
1960100000100
i960101700095
1960601900195
196095950001

HDCD FILTER PMD100
SMALL LED-BLUE
REMOTE W/RECIEVER
2 METER 2 COND. 26AWG
KRC-3 END CAP
KAV-300i BUTTON
CLS-440-2 PEM NUT
SANYO TRAN/P FOR 250cd
KAV-250cd TRIMPLATE
KAV-250cd FACEPLATE
WARRANTY CARD ALL PROD
COMPLIMENTARY CARD
KAV-250 cd OWNERS MANA
KAC-250cd ENVELOPE
KAV-250cd INTR~ LETTER

191095950200

KAV-250 cd SHIPPING

1920000950140

KAV-250cd TRIMPLATE

1920540950105 KAV-250cd FACEPLATE

1920900950105 KAV-250cd FACEPLATE

1920900950105 KAV-250cd FACEPLATE

1920000950105 KAV-250 cd FACEPLATE

Sub
Qty Assembly
Per Level

1 1
1 1

1

2

1

2

1

2

1

2
2 , 2
7 2
6 2
1

2

1 2
1

2

1 2
1 2
1 2
1 2
1 2

1 2

Reference Designators