Philips CDR-775, Руководство по обслуживанию

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Service modes, repair tips and faultfinding trees
GB 19 CDR 3rd gen. 5.
Figure 5-8
Figure 5-9
5.2.2 Mainboard
Power supply part on mainboard
•
Description.
The most important part of an electrical function is the power
supply. Without it will never operate. The power supplies as
well analog as digital equipment. For these reasons the power
supply is split-up in different sections. One for the digital
electronics, one for the servo controls and one for the AUDIO
part. The servo controls are the big consuming parts with high
peak-currents, also introducing disturbances in the power lines.
The audio part needs very “clean” power, because noise and
ripples have there reflection in the audio signals, specially in S/
N and THD+N. Some of the power supplies are switched off,
this to reduce consumption in case of standby.
The different power supplies are delivered to the PCB via
connector 1500 This is a 11 pole connector with following
voltages on it: +5V, +12V, -8V, VFTD, VDC1 and VDC2.
The last 3 voltages are not used on the main PCB, but are
meant for the FTD (Fluorescent Tube Display). They are
directly routed to connector 1705.
The other voltages are split up in different functions on the
PCB. The following block-diagram gives an indication of that
implementation.
Figure 5-10
• Power supply to main board.
Power supply enters the BOARD via connector 1500. Pinning
as follows:
Connector 1500
pin 1: VDC2 : 3V8 (10%
pin 2: VFTD : -38V (5%
pin 3: VDC1 : 3V8 (10%
pin 4: GND : Ground.
pin 5: D5V : +5V (5%
pin 6: D5V : +5V (5%
pin 7: GND : Ground.
pin 8: GND : Ground.
pin 9: GND : Ground.
pin 10: 12V : 12V (10%
pin 11: -8V : -8V (10%
FINALISED CD-R DISC
LOADED
SET OK
CD-R DISC PARTIALLY
RECORDED OR EMPTY
START RECORDING
FROM DIGITAL
SOURCE
START MANUAL
RECORDING FROM
ANALOG SOURCE
CD-R DISC LOADED
LEVEL
ADJUSTABLE?
NO
YES
DIGITAL IN?
OPTICAL IN?
NO
YES
RECORDING
SUCCESSFUL?
NO
YES
NO
YES
DISPLAY:
“CD R” &
OPC INFO?
YES
DISC
DETECTION &
READING?
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
•
DISC: DIRT, SCRATCHES, DAMAGED...
NO
•
POWER SUPPLY VOLTAGES
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
•
WIRING
NO
YES
DISPLAY:
“CD” &
T.O.C. INFO?
SEE CD-DA DISC
FAULT FINDING
CHECK:
•
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
•
DISPLAY BOARD (SEE FAULT FINDING GUIDE DISPLAY BOARD)
⇒
EASY JOG KNOB
⇒
I2C COMMUNICATION
⇒
ELECTRICAL SERVICE DIAGNOSTICS:
KEYBOARD TEST
•
AUDIO CONNECTIONS & CABLES
CHECK:
IC7005, OPTICAL RECEIVER 6000
•
AUDIO CONNECTIONS & CABLES
•
I/O BOARD
⇒
FLEX CONNECTION
⇒
⇒
+5V (pin 8 conn. 1000)
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR
"BERRn" ERROR OCCURS
CHECK:
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CL 96532076_018.eps
290799
CD-RW DISC LOADED
START ERASING OF LAST RECORDED TRACK
SET OK
ERASING
SUCCESSFUL?
YES
NO
FINALISED CD-RW DISC
LOADED
CD-RW DISC PARTIALLY
RECORDED OR EMPTY
NO
YES
DISPLAY:
“CD RW” &
OPC INFO?
YES
DISC
DETECTION &
READING?
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR
"BERRn" ERROR OCCURS
CHECK:
•
DISC: DIRT, SCRATCHES, DAMAGED...
NO
•
POWER SUPPLY VOLTAGES
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR
"BERRn" ERROR OCCURS
CHECK:
•
WIRING
NO
YES
DISPLAY:
“CD” &
T.O.C. INFO?
SEE CD-DA DISC
FAULT FINDING
CHECK:
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
•
IF DISC CORRUPTED TRY DC ERASE
CL 96532076_019.eps
290799
1500
VFTD, VDC1,
VDC2
Audi
o
Part
Digital
Part
Servo
Part
1705
-8V
+12V
+5V
3V3
-5V
9V
-8VA
+12VA
+5VA
D5V
D3V3
D5VS
L5V
12VPWR
+9SRVPWR
A-8V
L-5V
FS30V
Power_up.
L12V
DC to DC
CL06532018_013.eps
030300