Pioneer PDP-6010FD Service Manual page 56

1
A
No video from TV signal
=> TV
TV signal is not displayed on the
screen.
Yes
Is the input selecter set to TV?
(ANT-A or B)
B Yes
Is a signal output normally from
the FE to IC4601?(pins 55, 57)
Yes
Which signal is not output,
main or sub signal?
MAIN
Is a signal output from IC4601?
(pins 42, 45)
3
Yes
C
Has the signal arrived at IC4801?
(pins 22, 26)
7
Yes
Is the communication between
each IC on the MAIN Assy and
the microcomputer normal?
Yes
Has the symptom been settled
when the MAIN Assy is replaced?
Yes
Replace the MAIN Assy.
D
Waveforms
Input signal: Color-bar
E
IC4601 - pin 49 (Composite)
5
V: 500 mV/div H: 20 μsec/div
F
56
1
2
No
Set the Input selector to TV.
(ANT-A or B)
No
Check around the FE and check
the communications between FE
2
and microcomuputer. If there was
no ploblem replace MAIN Assy.
SUB
No
Check around IC4601 and check the
communications between IC4601
4
and microcomuputer.If there was no
ploblem replace IC4601.
No
Check the circuit between IC4601 and
IC4801 and replace broken parts.
8
No
Check around the IC that is found to
have failure in communication and
the microcomputer. If there was no
ploblem replace MAIN Assy.
No
The panel is defective.
IC4601 - pin 57 IC4601 - pin 42 (S-video)
2 3
V: 500 mV/div H: 20 μsec/div V: 500 mV/div H: 20 μsec/div
IC4801 - pin 70 (Composite) IC4801 - pin 22 (Composite)
6 7
V: 500 mV/div H: 20 μsec/div V: 500 mV/div H: 20 μsec/div
PDP-6010FD
2
3
No
Is a signal output from IC4601?
(pin 49)
Yes
No
Has the signal arrived at IC4801?
(pin 70)
IC4601 - pin 45 (Composite)
4
V: 500 mV/div H: 20 μsec/div
IC4801 - pin 22 (S-video)
7
V: 500 mV/div H: 20 μsec/div
3
4
5
6
IC4601 - pin 45 (S-video)
4
V: 500 mV/div H: 20 μsec/div
IC4801 - pin 26 (S-video)
8
V: 500 mV/div H: 20 μsec/div
4