Yamaha DRX-1 Service Manual page 66

DRX-1
USE DVIO BOARD CIRCUIT DIAGRAMS 2, 3, 4 AND 5 AND DVIO TOP VIEW TEST POINTS
66
6. DVIO Board-2
RESET & CLOCK CHECK DVIO
Power On and exit
stand-by mode
Enable DVIO board:
- press channel up or down
untill the display shows CAM3
- press tuner key in order to
switch to the DV-source
The red LED above the
DV-input will light up.
OK
Check Reset signal (LOW)
on testpoint F214
OK
Check uP clock
on testpoint F201
(11,05MHz)
OK
Check CLOCKAUDTMP
on testpoint F303
(8,192MHz)
OK
Check Clock 27MHz
on testpoint F305
OK
Check Clock 27M_DV
on testpoint F307
(27MHz)
OK
Check Clock 27M_CON
on testpoint F308
(27MHz)
OK
Reset- and clock signals
are OK
Fig. 23
- Check connection
to Front DVIO
NOK
- Check IC 7203
- Check T 7207
- Check R 3203
NOK
- Check IC 7203
- Check T 7202
- Check x-tal1200
NOK
- Check IC 7203
- Check R 3201
- Check IC 7303
NOK
- Check IC 7307
- Check R 3315
- Check IC 7308
NOK
- Check IC 7303
- Check R 3317
- Check IC 7308
NOK
- Check IC 7404
- Check R 3318
- Check IC 7308
NOK
- Check IC 7500
- Check R 3319