Philips CDR570 Service Manual page 28

GB 28 5. CDR 3rd gen.
SERVO DRIVERS CHECK
USE CDR MAIN BOARD CIRCUIT DIAGRAMS 3 AND 4 AND CDR MAIN BOARD BOTTOM VIEW : SERVO DRIVERS TESTPOINTS
TRAY SERVO
PM3392A
TRAYOUT
GND
CH1:2.00 V= MTB 500us
PM3392A
TRAYIN
GND
CH1:2.00 V= MTB 500us
PM3392A
osc. a
TR+
GNDTR+
TR-
GNDTR-
CH1:5.00 V=
CH2:5.00 V= MTB 500us
PM3392A
osc. b
TR+
GNDTR+
TR-
GNDTR-
CH1:5.00 V=
CH2:5.00 V= MTB 500us
Service modes, repair tips and faultfinding trees
Switch on player
in MDD mode
Execute "TRAY" tests
NOK
Check power part
Check reset and clock part
OK
Check S1V65 (=1V65) at
testpoint S9
OK
Execute "tray open" test
Check Tray Out signal at testpoint S19
during command
Tray In (testpoint S20) stays at 3V2
OK
Execute "tray close" test
Check Tray In signal at testpoint S20
during tray command
Tray Out (testpoint S19) stays at 3V2
OK
Check TR+ (testpoint S21), TR- (testpoint S22) :
- values without commands 4V2
- values during "tray open" command (osc. a)
- values during "tray close" command (osc. b)
OK
Check signal TRAYSW at testpoint S23 :
3V3 during commands open and close,
0V after completion
OK
TRAY SERVO OK
Figure 5-18
OK
TRAY SERVO OK
NOK
Check IC7215, T7201, T7202
NOK
Check MACE 7270
NOK
Check MACE 7270
NOK
Check driver 7240
Check CDL4009
NOK
Check CDL4009
CL06532018_020.eps
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