Notes In Installing The Dsp Board - Roland DB-700UT Service Notes

DB-700
4. Checking power limiter
4.1 Set the following controls:
MASTER knob: 0
AMPLIFIER TYPE switch: TUBE DRIVE
The DSP internal generator outputs 1 kHz, sine test
signal.
Other controls: Don't care
4.2 Check power limiter:
Leave INPUT sockets disconnected.
Connect a 680Ω load to the hot and cold terminal of
LINE OUT BALANCED socket, respectively.
Turning MASTER knob from 0 to 10, check changes in
sound from WOOFER and LINEOUT. (See Fig.1.)
MASTER VOL:0 MASTER VOL:5
LINE OUT
16 Vp-p
WOOFER
10
MASTER VOL:MAX
8.2 Vp-p 3.6 Vp-p
120 Vp-p 120 Vp-p
Fig.1
ADJUATMENT
♦
DC OFFSET ADJ
Setting
1. Connect the probes of the DC voltmeter to the plus (RED)
and minus (BLACK) sides of the 15˝ WOOFER CORD.
(At no load.)
2. Adjust VR1 (on POWER BOARD) so that the DC offset is
at 0V±50mV.
DB-700 CHASSIS
15˝ WOOFER CORD
TWEETER CORD

NOTES IN INSTALLING THE DSP BOARD

Be sure to clamp the DSP BOARD with the cable tie
(H5319105).
May. 2000
RED
DC VOLTMETER
BLACK
ORANGE
BROWN