3. Maintenance
6
See Fig.3.3 for
enlarged view.
Fig.3.1 NP Board (20P8188)
See Fig.3.2 for
enlarged view.
3.1 Adjustment
Switching regulator frequency
and +5 V are adjusted by R34 and R84 respectively as shown in Table
3.1.
Table 3.1 Adjusters on NP board
Test points
Adjuster
Rating
Gate of Q16 and GND(R80)
R34
82.3 to 84.3 KHz
J2#3(+) and J2#5(-)
R84
5.07 V to 5.17 V
Fig.3.2 Power supply circuit, enlarged view (NP Board)
Regulator, U8
Type : PQ09RA1
Code : 000-131-421
Q16 gate
4A Fuse
R34 (F - ADJ)
R84 (V - ADJ)
J2
