Digitech_RP-1_Service_Manual.pdf

(2642 KB) Pobierz

RP-I Setup and Test Procedures

To access the RP-I setup and test menus, enter the UTILITY

mode and scroll left or right until the software version

number is displayed. Press the.parameter down button, twice

to enter the test menu.

Scroll right to access the

compressor

gain trim, distortion gain trim, and A/D

calibration programs.

The procedures for these setup

routines are detailed below.

Further scrolling will show

the EQ test, speaker simulator test, compression test,

distortion test, noise gate test, HISC test, RAM test, and

display tests. When done, return to the main utility menu.

i. Compressor gain trim: With a 1 Vp-p, 1KHz sine wave

measured at test pointoone (TPI) on the main PCB, adjust

P6 (50K trimpot) until the signal measured at TP4 is the

s~me amplitude as the signal at TPI.

2. Distortion gain trim: Adjust P7 (50k trimpot) until the

voltage measured at pin 7 of U97 is between -3mV DC and

+3mV DC.

3. A/D Calibration a) Gain: With a 14 Vp-p, IKHz sine wave

measured at TP2, adjust P2 (10K trimpot) until the signal

measured at TP3 is 14 Vp-p.

b) Bias: Reduce the signa! level 50 dB

t~ 44.3 mVp-p and adjust P3 (50K trimpot) until the

signal seen at TP3 is just barely all positive going or

all negative going.