Grundig GDR 6460 VCR, Service Manual

Page: 54 / 58

GRUNDIG Service
GDR 6460 VCR
2 - 38
B. No NORMAL AUDIO playback in record/playback mode(Check in REC mode)
No Normal Audio playback in
record/playback mode
Are there Audio signal at IC251
pin#2~11?
Is there recording signal at
IC251 pin#21?
Check Input SCART JACK.
Check Input Front JACK.
Check ICD02(DVD)
Check signal flow circuit.
YES
NO
NO
NO
Signal at IC251 pin#21 is transferred
to IC301 pin#13,15,17?
Collect signal at C222 is about
70Vp-p at 70KHz?
Check IC251.
YES
YES
Check Q203.
NO
Check P201 pin#2, 4, 8 and A/C
HEAD.
YES
REC (H) BASE voltage at Q206
is 5V?
Check IC501 pin#45.
NO
YES
C. No Hi-Fi Playback audio(PLAY MODE)
NO
Check A.SW at IC501
pin#19.
Is Audio signal at IC251 pin#41?
Is Audio signal output at IC602 pin
#3, 13?
Is Audio signal output at IC251
pin#16,17?
Are CLK and DATA obtained at
IC251 pin#42,43?
NO
Is 5V obtained at IC251 pin#40?
Replace IC251.
YES
YES
Is 12V obtained at IC251 pin#34?
NO
YES Check POWER circuit.
YES
Check Output JACK.
YES
Check IC602.
NO
D. No Hi-Fi playback in record/playback mode (REC MODE)
Are there Audio signal
at IC251 pin#2~11?
Is FM OSC signal at IC251
pin#36?
Check input SCART JACK.
Check input front jack.
Check ICD02(DVD).
Replace DRUM.
YES
NO
NO
NO
Is FM OSC signal at P401 pin#2?
Replace IC251
YES
HEAD CLEANING.
YES
E. No NORMAL AUDIO playback (PLAY MODE)
Is Playback Audio signal at
IC301 pin#11?
Replace IC251.
YES
NO
NO
Is there Playback Normal Audio
signal at IC251 pin #16,17?
Check A/C HEAD and IC301
YES
Check Output JACK.
YES
Is there normal Audio signal at
IC251 pin#17, 18?
NO
Check power circuit.
NO
Voltage at IC251 pin#34 is 12V?
Voltage at IC251 pin#40 and at
IC301 pin#18 is 5V?
F. No Sound in JK101 COAXIAL Jack.
Pin #25 of P100 is Digital
signal SPDIF?
Check JK101 and PCB pattern.
Check MPEG board.
YES
NO