Philips CDR570 Service Manual page 25

Service modes, repair tips and faultfinding trees
5.2.4 Servo drivers check
SERVO DRIVERS CHECK
USE CDR MAIN BOARD CIRCUIT DIAGRAMS 1, 3 AND 4 AND CDR MAIN BOARD BOTTOM VIEW : SERVO DRIVERS TESTPOINTS
FOCUS SERVO
PM3392A
Moving between
1V3 and 2V
VFO
GND
CH1:500mV= MTB2.00us
PM3392A
VFO
GND
CH1:500mV= MTB2.00us
PM3392A
FOC-/FOC+
GND
CH1:50.0mV= MTB 500ms
ch1: freq= 1.61 Hz
Switch on player
in MDD mode
Execute "focus" tests
NOK
Check power part
Check reset and clock part
OK
Check S1V65 (=1V65) at
testpoint S9
OK
Execute "focus on" test
Check VFO signal at testpoint S16
OK
Execute "focus off" test
Check VFO signal at testpoint S16
OK
Check signal across FOC+/FOC- at testpoints S17
and S18 when executing "focus on"
OK
FOCUS SERVO OK
Figure 5-15
CDR 3rd gen.
OK
FOCUS SERVO OK
NOK
Check IC7215, T7201, T7202
NOK
Check MACE 7270
NOK
Check MACE 7270
NOK
Check driver 7240
Check MACE 7270
Check CDM3800
5. GB 25
CL06532018_017.eps
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