Philips CDR570 Service Manual page 27

Service modes, repair tips and faultfinding trees
SERVO DRIVERS CHECK
USE CDR MAIN BOARD CIRCUIT DIAGRAMS 3 AND 4 AND CDR MAIN BOARD BOTTOM VIEW : SERVO DRIVERS TESTPOINTS
SLEDGE SERVO
PM3392A
VSL
GND
CH1:1.00 V= MTB 500ns
Switch on player
in MDD mode
Execute "sledge inwards"
and "sledge outwards" tests
NOK
Check power part
Check reset and clock part
OK
Check S1V65 (=1V65) at
testpoint S9
OK
Check voltages testpoints S4, S5, S7, S8 : +/- 1.6V
OK
Check voltage testpoint S1 : if S1=0V then S3=0V
if S1=1V65 then 1V<S3<4V
if S1=3V3 then S3=5V
Check voltage testpoint S2 : if S2=0V then S6=0V
if S2=1V65 then 1V<S6<4V
if S2=3V3 then S6=5V
OK
Check VSL signal at testpoint S10
OK
Check SL+ signal at testpoint S11 :
+3V (going to 5V4 when executing "sledge outwards")
Check SL- signal at testpoint S12 :
+5V4 (going to 3V4 when executing "sledge outwards")
OK
SLEDGE SERVO OK
Figure 5-17
CDR 3rd gen. 5.
OK
SLEDGE SERVO OK
NOK
Check IC7215, T7201, T7202
NOK
Check CDM3800
NOK
Check opamp 7225
NOK
Check MACE 7270
NOK
Check driver 7240
Check MACE 7270
CL06532018_019.eps
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