Hitachi DV-W1U - Manual (Page 9)

1 - 5
IS THERE
AN IMAGE?
No
Yes
BREAKDOWN BEFORE IC1201
CHECK IC1505 OR +8V LINE ETC.
CHECK IC1101/ IC1601
BREAKDOWN OF Q1505 OR
Q1506 OR D1504
BREAKDOWN OF
IC1501, IC1507
ARE IC1501
pins 8, 9, 15, 20
5V?
ARE THERE
SIGNALS AT IC1501
PINS 13, 15 and
IC1507 pins 9-14?
IS Q1505
BASE VOLTAGE
0V?
IS Q1505
COLLECTOR
VOLTAGE
8V?
IS IC1501 pin 21
and IC1507 pin 3-6
VOLTAGE 5V?
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
ARE THERE
SIGNALS AT IC1501
pins 1, 2, 3, 5 AND
IC1507 pins 40, 41, 45,
46, 47, 38?
NO SOUND
IS Q1507, Q1501
COLLECTOR
VOLTAGE 8V?
Yes
ARE SIGNALS AT
IC1507, IC1508,
IC1509, IC1510
pins 7, 8?
Yes
BREAKDOWN OF
Q1305, Q1307-Q1311, Q3503, Q3504
No
BREAKDOWN OF IC1201
BREAKDOWN OF IC1506
Yes
ARE IC1505
pin 3 +5V & pin 1 +8V
ARE THERE
SIGNALS AT IC1501
pins 26,27,28 and
IC1507 pins 34, 35, 36?
BREAKDOWN OF IC1501
No
BREAKDOWN OF Q1507, Q1501
No
BREAKDOWN OF
IC1507, IC1508, IC1509, IC1510
No
3-2. AUDIO CIRCUIT