Philips CDR770 - 5.2.4 Servo Drivers Check; Focus Servo

Service modes, repair tips and faultfinding trees
GB 25CDR 3rd gen. 5.
5.2.4 Servo drivers check
Figure 5-15
NOK
OK
OK
FOCUS SERVO OK
Switch on player
in MDD mode
SERVO DRIVERS CHECK
USE CDR MAIN BOARD CIRCUIT DIAGRAMS 1, 3 AND 4 AND CDR MAIN BOARD BOTTOM VIEW : SERVO DRIVERS TESTPOINTS
Execute "focus" tests
Check power part
Check reset and clock part
Check S1V65 (=1V65) at
testpoint S9
NOK
Check IC7215, T7201, T7202
OK
Check MACE 7270
OK
Check signal across FOC+/FOC- at testpoints S17
and S18 when executing "focus on"
NOK
Check driver 7240
Check MACE 7270
Check CDM3800
OK
FOCUS SERVO OK
FOCUS SERVO
OK
Check
VFO signal at testpoint S16
Execute "focus on" test
NOK
Check
VFO signal at testpoint S16
Execute "focus off" test
Check MACE 7270
NOK
PM3392A
CH1:500mV= MTB2.00us
VFO
GND
PM3392A
CH1:500mV= MTB2.00us
VFO
GND
Moving between
1V3 and 2V
PM3392A
ch1: freq= 1.61 Hz
CH1:50.0mV= MTB 500ms
GND
FOC-/FOC+
CL06532018_017.eps
290200