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(2) Results of diagnosis
Table 1-3 summarizes the results of diagnosis and the circuits/parts deemed to be defective in the B mode.
Loading
motor
Trouble
sensors
Tape
detection
switches,
etc.
Capstan
motor
Cylinder
Table 1-3 Results of B Mode Self-Diagnosis (1/2)
(There is one pulse or less within two
The pulse from the supply end sensor Is
defective. (No pulse is input for more than
100 ms continuously within two seconds.)
The pulse from the take-up end sensor is
defective. (No pulse ts input for more than
100 ms continuously within two seconds.)
Capstan motor
Trouble sensors (end sensor/end LED)
Q0905
IC0901
Trouble sensors (end sensor/end LED)
Q0905
ICO901
DC-DC converter circuit (B+ line)
TAB
The erase prevention tab detection switch
_| detects the record inhibit state (OFF).
¥
ME
The ME/MP tape detection switch detects
the MP state (OFF).
The Hi-8 MP tape detection switch detects _
the normal MP state (OFF).
_
$30
(OFF).
CFG
The CAPST. FG pulse is defective.
The cassette holder switch detects the state
where the cassette holder is not lowered
Caution:
These switches flash when they are
not pressed.
It is abnormal if they flash when
pressed.
Trouble sensor
ICO0901
(150 pulses or less within two seconds.)
Capstan motor
IC0651
IC0901
DC-DC converter circuit
The SW30/25 (CYL. FG) pulse is defective.
(No pulse is input normally within two
seconds.)
Cylinder
IC0631
IC0901
DC-DC converter circuit
Mechanism
mode
switch
UST
The unloading stop position detection signal
| is defective.
REW
The rewind position detection signal is
defective.
Caution:
The positions shown on the left are
detected in the order described
within 10 seconds.
Mechanism mode switch
E7-5
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