Sanyo VHR-790 Service Manual page 4

Head playback output voltage check
Warning
)assette Used
Display
Envelope Detection Output Voltage
Main Cause
Envelope detec- 4V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
kz+"'-o"v !%(:::::::::
When the output voltage differ-
Cassette
tion output
(IC301
Pin
25 or
with normal
R3032 Mark side:
playback –
see Fig. 2-l-1) "v
output
Switching pulse
(TP183: see Fig.
normal
CH-1 CH-2
2-l-2)
Envelope detec- ~v ___________________________________
When the output
voltage differ-
tion output
(IC301 Pin 25 or
R3032 Mark side:
,,L1l
blinking
see
Fig. 2-l-1) 'v &!Y:~Jhan
'n~fiw:::::::
Switching pulse
been performed accurately
(TP183: see Fig.
CH-1 CH-2
One video head is clogged
Recorded
2-l-2)
One video head has worn out
cassette
(with tabs)
When the average output volt-
Envelope detec- 4V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
tion output
(IC301 Pin 25 or
R3032 Mark side:
IL,, bllnking
see Fig. 2-l-1)
"v ~,:,than ~K~::;;;;;
Switching pulse
(TP183: see Fig.
Both video heads are clogged
CH-1 CH-2
2-l-2)
. Both
video heads have worn
out
Envelope detec- ~v ___________________________________
tion output
(IC301 Pin 25 or
"L" blinking
R3032 Mark side:
Rental
see Fig. 2-l-1) 'v klz~:$flan
:$gg:d
Switching pulse
cassette
(TP183: see Fig.
CH-1 CH-2
One video head is clogged
(without tabs) 2-l-2)
One video head has worn out
Some rental cassettes may have extremely low video playback outputs
even when both video heads are normal.
As the average output voltage of the two heads maybe less than 0.5V for some, no warning displays will be
shown.
3. Cylinder rotation accumulated time display
Press the STOP button on the remote control for approximately 10 seconds and the cylinder rotation accumulated time excluding
the cassette out and standby operation time will be displayed on the "Hours" display in units of 100 hours. ("33" will be displayed
for 10 seconds for 3,200 to 3,299 hours.)
To erase the cylinder rotation accumulated time display, press the RESET button on the remote control during the accumulated
time display.
I
I
—1
I
Cylinder rotation accumulated display (Tape counter "Hours" display)
-4–