Philips MRD300/37 Service Manual page 10

REPAIR INSTRUCTIONS
D
POWER SUPPLY
NO WORKING
ALL VOITAGE
NO OUTPUT
YES
CHECK F901
BAD CAUSE DAMAGE
NO
Check RL901
NO
working or not
yes
YES
Check T903 pin3
approx if +28v Voltage
D905and their conjoint part
no
Check BR901
and RT901
Check +7v and -7v Check IC 401 pin16=+7V
NO
give circuit pin7=-7V offirm correct
2-4
CHECK D905 AND
+30V Voltage
No Output its conjoint part
CHECK D906 AND
+6V Voltage
No Output its conjoint part
CHECK D907 AND
+12V Voltage
No Output its conjoint part
CHECK D908 AND
-24V Voltage
No Output its conjoint part
Check RL901 and
its conn circuti
Check T903,IC903,IC904,
SN901,D902.D906,D907,
F
Aux/Tv in
No Sound
Check JK400 Check Repair Between
loose bad INT IC401 to JK300 and IC403
Circuit
NO NO
Check Repair IC403 to
YES
IC100 tata
E
Audio Output
No Sound
Check CN500 and its Check IC402,IC502,IC503
NO
conjoint part Pin4,7,12,15 Voltage=30V
YES
Check repair in 3.3V 2.5V Check IC500 their Voltage
NO
net its conjoint part correct is 3.3V 2.5V
Check IC100 and its Check Between IC500 to
NO
conjoint part IC100 Circuit
2-4
Repair Between IC503
L/R channel
to JK500 and IC500
No Sound
circuit
Repair Between IC502
RS/center channel
to JK500 and IC500
No Sound
circuit
Repair Between IC402
LS/SUB channel
to JK500 and IC500
No Sound
circuit
Repair Between IC1000
YES
IC402 IC502 IC503 to
and IC403 circuit