Sharp CD-RW5000 Service Manual page 55

Troubleshooting for CD-R unit
Check the items 1, 2 and 3. If the playback/recording operation is not possible, the CD-R unit is defective.
When no sound is heard during playback, check the item 4. If there are no output signals, CD-R unit is defective.
1. Check of supply voltage
-8V
+12V Pin 2 of CNP808
+5V Pins 6 and 7 of CNP808
2. Check of control signal from the system microcomputer
1. DATA
2. CLOCK Pin 5 of CNP912
3. RESET Pin 3 of CNP912
3. Check of recording signal
CD or AUX OPT (Digital)
EBU INPUT Pin 1 of CNP911
OTHER FUNCTION (Analog)
A-IN L-ch, R-ch Pin 3 and 5 of CNP914
4. Check of playback signal
A-OUT L-ch, R-ch Pins 1 and 2 of CNP914
Troubleshooting during phono input of stereo turntable
Since this unit is not provided with an earth terminal, the hum noise may be increased during playback when it is connected to a
record player having an earth lead separated from a RCA lead.
In such a case, replace the screw shown in the following figure with XJBSD30P10000 and connect the earth lead of the player.
(Replace the black screw with a general un painted screw.)
Replace this screw and
connect the earth lead.
Pin 1 of CNP808
Pin 7 of CNP912
Stopped
CH1=5V CH2=5V
DC P*10 DC P*10
MD deck,DSS tuners or DAT decks
To the line
output
socket
Connection cable for
digital recording
Figure 55-2
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CD-RW5000
27-JUL-00 09 58
CH3=5V
DC P*10
Figure 55-1
VCR
To the line output
White
Red
RCA lead
Stereo turntable
RCA lead
MD recorder
To the optical line input socket
50 µs/d
1
2
3