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TROUBLESHOOTING
index:
Note:
Y86 ... Main chassis
.
X73 ... X73-1550 (or X73-1560): AMP UNI
<>
Check and judgement
X77 ... X77-1340: OVP UNIT
=z
Malfunction
1. ANALOG METER SECTION
Rectified
output
POWER
Refer to dc
-- voltage as shown
| in schematic
f diagram.
|
Each dc
voltage
YES
Circuit
Protector
selector
POWER
Transformer
T1
OVP (X77)
AMP (X73)
The ground point
;-- Obserbe the
,-- The ground point
ro Rotation for
_-. Pushing the
r- is 7}, as shown in
! waveform at P1,
t is Vg (or lg) as
| VOLTAGE control
vil) CHECK
! schematic
; 3 pin and 4 pin (5
1 shown in
} should change the
1
switch.
1
diagram.
! pin is common)
'schematic
|
Vre¢ voltage (U3,
i
diagram.
7 pin)
YES
no.
*Continue
to next
page
U7 (2/2), Q15
U6 (1/2)
U2 (X77)
U3 (2/2)
CV VR (Y86)
Note:
CV VR; VOLTAGE VR {VR1)
13
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