BOSS DR 55 SERVICE NOTES

Page 1

FEB.21,1980 DR-55

DR-55 ISERVICE NOTESI

SPECIFICATIONS

OUTPUT DES : +5 V (8 ms) CSQ : +4 V (10 ms)
VOICE : (at OUTPUT Jack, Power source 6 V)
VOLUME, TONE : at max. ACCENT : at min.
Amplitude (Vpp) Frequency (Hz) J Decay (ms)
. . I7 I " I -
min. avr. I max. min.; avr. Imax. I min. avr. max.
I I
BD l.O 1.3 1.6 4 14 62 18
I I (16 ms) I
RS 0.7 0.9 l 2 0.65 0.75 IL.85 I 5 7 10
,__ I {1530 mSII I
SD 0.5 0.4 o 6 2 7 3.1 I 3 5 I 55 75 lOO
(noise) l.2 (320 ms)I
HH 1.2 r I I I I 3% I 55 70
I I I I I I J L

POWER REQUIREMENTS - 4.5 V-6.5 V. ICu draw 5.5 ma @6 V}
(x

DIMENSIONS - 211 (W) x 116
WEIGHT - 850 g
LED TLR~124 Switch 33362335 Knob no l2
(019-028) (OOlleBI \ (ole-125)
I.
\ I
, I
Knob no.78
r ' I
(Ola-O78) IE

Chassis no.29l-efi
(061-291)

Jack SG-8026

<009~O48I
Knob no.77 Switch SSP-O4205 Switch SQPRZ4-12P
(016~O77) (001-293) (OOl-ZZS)

* For the STAAT and STOP switches, refer to the Parts List

@Roland Printed in Japan AC2 I

Sleeve Nut No.2 3 X 16.4 mm

(120-002) Chassis

/////////'No.290
(061-290)

Chassis
No.29l
removable
screws

(two at rear)
3 x 8 mm

Battery Connector
w/strap (OlO-OOl)

Take caution

against pinching
leads between pc
board and the nut.

PCB RY-Z
(150-002)

E Holder HESA

(064H055) Covers No.65 I

(065-065) I

Battery Case
No.50 TH~l§O3/4B
(012-050)
<:> I :>-}V~_.Rubber Foot
I Bush No.19
* See caution below when {068-019)
covering the PCB. JZBBfil
Jack
rm" 1 #22 7' 1
(OUiIUT) EMfiQF/W q {gggt SWitCh)
r _ _P\ , ______ J.
Sin-0435 01 b30_ E H m £_____ 7, @I O HLJ-OZES-Ol-OEO
(009~o26) (CO9~026)

I
Coin Screw 3 x 8 mm .(123-014)

* CAUTION: Do not lay jack leads over the PCB as shown in dotted line.
Since high gain stage is located on that area, the leads will

provide feedback loop.

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