BBK BX900U User manual

Model: BX900U
CONTENTS
PAGE
Specifications ……………………………………………………………………………………………………... 1-6
Block Diagram ................................................................................................................................................7
Safety Checks .............................................................................................................................................8-9
Wiring Diagrams……………………………………………………………………………………………………….10
Schematic Diagrams……………………………………………………………………………………...……....11-12
Printed Circuit Boards………………………………………………..………………………..…………..….… 13-14
Exploded View..............................................................................................................................................15

永 福 电 子 有 限 公 司
YUNG FU ELECTRONICS LTD
Model No CD003 Date:2013-1-17
Section: FM TUNER Page: 1 of 6
Measuring Items Condition Unit Normal Limit Test Data
1 2 3
Tuning Frequency Range Low End MHz 64 +/-0.5
High End MHz 108 +/-0.5
Intermediate Frequency MHz 10.7 +/-0.1
Max. Sensitivity 64MHz dB 20
90MHz dB 20
106MHz dB 20
-30dB Quieting S/N Sensitivity 64MHz dB 26
90MHz dB 26
106MHz dB 26
Dial Calibration 64MHz MHz 0.5
60MHz MHz 0.5
106MHz MHz 0.5
IF Rejection 90MHz dB 40 35
Image Rejection 106MHz dB 26 20
AM Rejection 90MHz dB 40 30
RF Overload Distortion:100dB 75KHz Dev 90MHz % 3 4
10%THD Output Power 75KHz Dev 90MHz W 8 7.8
Maximum o/p 75KHz Dev 60dB W 8 7.8
Distortion at Max Volume 22.5KHz Dev
Distortion at Max Volume,75KHz Dev
90MHz % 10
90MHz % 25
-6dBAudio Fidelity Low Freq Hz 100 150
High Freq KHz 4.5 3.8
-3dB Limiting Sensitivity 90MHz dB 30 35
Distortion at Ref Output,75KHz Dev 90MHz % 1 3
S/N Ratio with 1mV 90MHz dB 50 40
Modulation Hum 90MHz dB 55 45
Noise Output (Hum and Noise) Max Vol mV
Min Vol mV <3
Auto Tuning Stop(Seek) Sensitivity 64MHz dB 20 28
90MHz dB 20 28
106MHz dB 20 28
Fall Out Voltage(AC) 90MHz % <70
Fall Out Voltage(DC) 90MHz % <70
Fall Out Voltage 9VDC Clock Backup % -30
AFC Holding –3dB KHz
Stereo Separation: 1Mv75KhzDev 100HZ dB
1KHZ dB 28
10KHZ dB
Stereo indicator Sensitivity 90MHZ dB 24 28
Mono/Stereo Output Difference 90MHZ dB 1
L/R Channel Output Difference dB 3
Test Conditions Approved By: 程挺锋
1.Supply Voltage : AC 220-240V 50Hz
2.Standard Output : 50 Mw
3.Speaker impedance: 4 OHM
SPECIFICATIONS
1

永 福 电 子 有 限 公 司
YUNG FU ELECTRONICS LTD
Model NO: CD003 Date: 2013-1-17
Section: CD Page: 2 of 6
Measuring Items Condition Unit Norm
al
Limit Test Data
1 2 3
Distortion at Max Vol CD-1(0dB) 1KHz % 25
CD10% THD Output Power CD-1(OdB) 1KHz W 8 7.8
CD Output Level Voltage(Max) 1KHz W 8 7.8
Frequency Response Speaker Output
CD-1,1Khz at Reference Output OdB
63Hz dB
100Hz dB +/-3
1KHz dB
10KHz dB +/-3
20KHz dB
THD at Standard Output(at-10dB) 1KHz % 1
Separation:CD-1at Speaker Output 100Hz dB
1KHz dB 45 40
10KHz dB
S/N Ratio(Input Filter)
Dynamic Range
Initial Reading Time
TCD-782 dB 45
TCD-782 Sec
TCD-782 Sec <10
Access Time: TCD—782 First Track Sec <8
Last Track Sec <10
Interruption Philips#444A Scratch mm 0.8
Black Doc mm 0.6
Fingerprint mm 0.075
Eccentricity TCD-712R mm
Vertical Deviation TCD-713R mm 0.8
Hum and Noise Vol Max mV <10
Vol Min mV <3
Minimum Operating Voltage(AC) % <80
Minimum Operating Voltage(DC) % <70
Maximum power Consumption Full load burn-in W
Test Conditions Approved By: 程挺锋
1.Supply Voltage : AC 220-240V 50Hz
2.Standard Output : 50 mW
3.Speaker impedance: 4 OHM
SPECIFICATIONS
2

永 福 电 子 有 限 公 司
YUNG FU ELECTRONICS LTD
Model NO: CD003 Date: 2013-1-17
Section:EQ Page: 3 of 6
Measuring Items Condition Unit Norm
al
Limit Test Data
1 2 3
ROCK 20Hz dB
100Hz dB
1K dB
10K dB
20K dB
CLAS 20Hz dB
100Hz dB
1K dB
10K dB
20K dB
POP 20Hz dB
100Hz dB
1K dB
10K dB
20K dB
JAZZ 20Hz dB
100Hz dB
1K dB
10K dB
20K dB
FLAT 20Hz dB
100Hz dB
1K dB
10K dB
20K dB
Test Conditions Approved By: 程挺锋
1.Supply Voltage : AC 220-240V 50Hz
2.Standard Output : 50 mW
3.Speaker impedance: 4 OHM
SPECIFICATIONS
3

YUNG FU ELECTRONICS LTD
Model NO: CD003 Date: 2013-1-17
Section: Audio Page: 4 of 6
Measuring Items Condition Unit Normal Limit Test Data
1 2 3
Max Power O/P at Headphone 90MHz MW
FM 75KHz Dev 1KHz
CD OdB 1KHz
AUX IN 500mV 1KHz
BLUETOTH 784 OdB 1KHz
dB +/-3
90KHz dB +/-3
784 OdB 1KHz dB +3/-0
OdB 1KHz dB +3/-0
784 OdB 1KHz dB
Bass Boost 100Hz dB
125Hz dB
Test Conditions Approved By: 程挺锋
1.Supply Voltage : AC 220-240V 50Hz
2.Standard Output : 50 Mw
3.Speaker impedance: 4 OHM
SPECIFICATIONS
4

永 福 电 子 有 限 公 司
YUNG FU ELECTRONICS LTD
Model NO: CD003 Date: 2013-1-17
Section: AUX SECTION Page: 5 of 6
Measuring Items Condition Unit Normal Limit Test Data
1 2 3
10%T.H.D Power O/P 500MV(Input) W8 7.8
Stereo Separation 180MV(Input) dB 38 35
Min Hum 180MV(Input) mV 0.7 2
Max Hum mV
S/N dB 55 50
Total Harmonic Distortion %0.5 1
Test Conditions Approved By: 程挺锋
1.Supply Voltage : AC 220-240V 50Hz
2.Standard Output : 50 Mw
3.Speaker impedance: 4 OHM
SPECIFICATIONS
5

永 福 电 子 有 限 公 司
YUNG FU ELECTRONICS LTD
Model NO: CD003 Date:2013-1-17
Section: BLUETOOTH Page:6of 6
Measuring Items Condition Unit Norm
al
Limit Test Data
1 2 3
Distortion at Max Vol 784(0dB) 1KHz % 25
CD10% THD Output Power 784(OdB) 1KHz W 8 7.8
CD Output Level Voltage 1KHz W 8 7.8
Frequency Response Speaker Output
CD-1,1Khz at Reference Output OdB
63Hz dB
100Hz dB +6/-3
1KHz dB
10KHz dB +6/-3
20KHz dB
THD at Standard Output(at-10dB) 1KHz % 1
Separation:CD-1at Speaker Output 100Hz dB
1KHz dB 45 40
10KHz dB
S/N Ratio(Input Filter) TCD-784 dB 40
Hum and Noise Vol Max mV <15
Vol Min mV <5
Minimum Operating Voltage(AC) % <80
Minimum Operating Voltage(DC) % <70
Test Conditions Approved By: 程挺锋
1.Supply Voltage : AC 220-240V 50Hz
2.Standard Output : 50 Mw
3.Speaker impedance: 4 OHM
SPECIFICATIONS
6

BLOCK DIAGRAM
7

5
SAFETY CHECKS
Important Note!!! Do the following safety checks after servicing this unit.
1. Remove all the externally connected test equipment and wires before testing the unit.
2. Use the safety test circuit as shown below.
3. Plug the power cord or unit to be tested into the test receptacle.
4. Switch the unit being tested to ON or PLAY.
5. Connect external jack/terminal contact VTVM across a 1k resistor in the test circuit. Set the meter to
a high (150V AC) scale to avoid meter damage and then touch the points with the test probe.
If the meter reading indicates less than 3 volts on all test points, set the meter to a low (3V AC) scale
and repeat the test.
6. Any reading greater than 0.2 volt indicates a potential shock hazard. If this occurs, determine the
cause of the leakage, correct the problem, and repeat the safety test.
ALIGNMENT AND ADJUSTMENT
SERVICE ADJUSTMENT
Lubrication
The mechanical parts are factory coated with a thin coat of light grease and should not require further
lubrication. If a light grease is applied, be careful not to get any grease on the play/record head or erase
head, hubs, pulleys, tapes reels, drive belts, or switches. Use a good lubricant such as Silicon Lube G331L
or Lubricate (00).
Service Check
Before aligning the mechanism, wipe off any accumulated dirt with denatured alcohol. Wipe around parts
where the tape contacts and around all rotating parts. Drive belts are specially processed. Do not clean
them with alcohol.
8

7
CD PLAYER CHECKING PROCEDURES
A. WAVE E/F BALANCE ADJUSTMENT
1) Test Point : VC, TS10.
2) Test Disc : Sony Test CD Type 3.
3) Test Equipment :
Scope : DC 0.2 V 0.5 ms.
4) Test Mode : Play Sony CD, Type 3, Track 1, Press FF.
(Fast Forward), Until A=B (as Figure Bellow).
SCOPE : DC POSITION
A
B
Figure A
B. FOCUS-BIAS ADJUSTMENT
1) Test Point : VC RFO.
2) Test Disc : Sony Test CD, Type 3.
3) Test Equipment :
Scope : DC 0.5 V 0.5 Ps.
4) Test Mode : Play Sony CD, Type 3, Track 1,
Make Wave Form (Eye Pattern) Max. And Clear.
SCOPE : AC POSITION
Figure B
9

WIRING DRAWING
10

SCHEMATIC DIAGRAMS
11

SCHEMATIC DIAGRAMS
12

SCHEMATIC DIAGRAMS
13

PRINTED CIRCUIT BOARDS
14

PRINTED CIRCUIT BOARDS
15

16