Magnavox DV225MG9 Service Manual page 33

FLOW CHART NO.12
Hi-Fi audio can not be recorded normally. (E-E mode is normal.)
Is the REC FM signal outputted to Pin(26) of IC451?
Yes
Is the line between Pin(8) of CN253 and
Pin(26) of IC451 normal?
Yes
Replace the Cylinder Assembly.
FLOW CHART NO.13
Hi-Fi audio can not be playbacked normally. (Hi-Fi E-E mode is normal.)
Is the Playback Envelope signal outputted to
Pin(33) of IC451?
Yes
Replace Cylinder Assembly.
FLOW CHART NO.14
Audio can not be recorded normally in the linear audio mode. (E-E mode is normal.)
Is the audio signal inputted into Pin(76,78,80) of IC301?
Yes
Does the Bias oscillation circuit operate normally?
Yes
Is the audio signal outputted to Pin(10) of IC301?
Yes
Is the audio signal outputted to Pin(9) of IC301?
Yes
Replace ACE head.
FLOW CHART NO.15
Audio can not be playbacked normally in the linear audio mode. (E-E mode is normal.)
Is the audio signal supplied to Pin(6) of IC301?
Is there no dirt on the surface of ACE head assembly?
Yes
Is the height of ACE head assembly appropriate?
Yes
Replace the ACE head assembly.
No
No
Replace IC451.
No
Service the line between Pin(8) of CN253 and
Pin(26) of IC451.
No
Is the Hi-Fi-H-SW signal inputted into to Pin(39) of IC451?
Yes
Replace
Check the Hi-Fi-H-SW line between
IC451.
Pin(39) of IC451 and Pin(25) of
IC501, and service it if defective.
No
Check the line between Pin(6) of IC451 and
Pin(76,78,80) of IC301, and service it if defective.
No
Check the Bias oscillation circuit ( Q421,Q422,
Q425,Q426) and service it if defective.
No
Replace IC301.
No
Replace IC301.
Yes
Is the audio signal outputted to Pin(10) of IC301?
Yes
Check the line between Pin(10) of
IC301 and Pin(4) of IC451, and
service it if defective.
No
Clean the surface of ACE head assembly.
No
Readjust the height of the ACE head assembly.
1-10-12
No
No
Replace
IC301.
E8E62TR