Philips CDR570 Service Manual page 26

GB 26 5. CDR 3rd gen.
SERVO DRIVERS CHECK
USE CDR MAIN BOARD CIRCUIT DIAGRAMS 1, 3 AND 4 AND CDR MAIN BOARD BOTTOM VIEW : SERVO DRIVERS TESTPOINTS
RADIAL SERVO
PM3392A
VRA
GND
CH1:1.00 V= MTB 500ns
ch1:freq=532kHz
PM3392A
VRA
GND
CH1:1.00 V= MTB 500ns
ch1:freq=1.06MHz
Service modes, repair tips and faultfinding trees
Switch on player
in MDD mode
Execute "radial control" tests
NOK
Check power part
Check reset and clock part
OK
Check S1V65 (=1V65) at
testpoint S9
OK
Execute "radial control on" test
Check VRA signal at testpoint S13
OK
Execute "radial control off" test
Check VRA signal at testpoint S13
OK
Check RAD+ signal at testpoint S14 :
+4V2 (going to 6V8 when executing "radial control on")
Check RAD- signal at testpoint S15 :
+0V65 (going to 4V3 when executing "radial control off")
OK
RADIAL SERVO OK
Figure 5-16
OK
RADIAL SERVO OK
NOK
Check IC7215, T7201, T7202
NOK
Check MACE 7270
NOK
Check MACE 7270
NOK
Check driver 7240
Check MACE 7270
Check CDM3800
CL06532018_018.eps
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