Philips MRD300/37 Service Manual page 11

REPAIR INSTRUCTIONS
Check
CN701pin 11=5V
pin12=12V
Check CN702 pin1,3
YES
see F its audio output
Ceck IC152 data From
RB101pin3/ce,pin4DI,
pin5/CL,pin6/DO
Check Repair Between
RB101 to main pcb IC400
and IC400 Circuit
VT section circuit
Check IC152
J
Digital Line
No sound
At DVD mode Check
Q288"C"=5V
OK
Check Between cn300 to
Av pcb cn300 and IC100
ok
Check IC100 circuit
2-5
G
Tuner
No Output
NO
NO
NO
Check tuner vt From c161
NO
low Frequency=1.5-2.0v
High Frequency=8.0-9.0V
NO
VT No Change
Check IC152 osc input
pin13=-AM input
pin14--FM input
NO
A:Repair AM osc stion(T003)or
(Between IC101Pin30 to IC152 pin13 circuit)
B:Repair FM osc section
(Between EF001 Pin8 to IC152 pin14 circuit)
Check FM IF output
NO FM function
Q101,Q102
yes
CCheck AM IF
NO
(T102/CF103) Check T105
OK OK
Check IC101audio ooutput
IC101 pin16 to RB101 pin13(R-CH)
IC101pin17 to RB101pin15(L-CH)
OK
Check main pcb of Tuner input Circuit
(Between IC401pin4 and pin11)
I
Audio Line
No sound
Check IC403 to IC404
IC405,IC406 Circuit
OK
Check IC404,IC405
IC406 to IC407 Circuit
YES
Check Q402,Q405,Q404
Circuit
2-5
H
Ear Head phone
No sound
Check Between RB501 to RE-INSERT AND FIX
YES
CN400 Cable loose or INT THE CABLE
NO
Check Between Check IC403 and
NO
IC412 to IC410 and its around
IC408 Circuit
YES
Check IC412 circuit