User Guide

16
16
DVM-2815
Ye s
No
FLOW CHART NO.13
The key operation is not functioning.
Are the contact point and the installation state of the
key switches (SW2201 - 2214) normal?
Is the control voltage normally supplied to pins(38,
39, 40, 41, 42) of IC3001?
Check the switches (
SW2201 - 2214 )
and their periphery, and service it if defective.
No
Re-install the switches (
SW2201 - 2214 )
correctly or replace the poor switch.
Replace IC3001.
Ye s
Ye s
Ye s
Ye s
Ye s
No
No
No
No
FLOW CHART NO.12
The fluorescent display tube does not light up.
Is 3.3V voltage supplied to Pin(6) and
Pin(24) of IC2001?
Is the voltage of approximately -24V to -28V
supplied to Pin(15) of IC2001?
Is there 500kHz oscillation at Pin(26) of IC2001?
Are the filament voltage supplied between
Pins(1, 2) and Pins(34, 35) of the fluorescent
display tube? And the negative voltage applied
between these pins and GND?
Replace the fluorescent display tube.
Check the P-ON+3.3V line and service it if defectiv
e.
Check the -FL (-28V) line and service it if defective
.
Check R2015, IC2001 and their periphery, and
service it if defective.
Check the EV+3.3V
line, and service
it if defective.
Is the "H" signal inputted
to base of Q1016?
Check D1016, D1017, T1001, and their periphery,
and service it if defective.
Is -17V voltage supplied to collector of Q1005?
No
Ye s
Ye s
No
Check Q1015, Q1016, D1055, and
their periphery, and service it if defective.
38pin 39pin 40pin 41pin 42pin
KEY1 KEY2 KEY3 KEY4 KEY5
0.00 - 0.50
SW2201
POWER
SW2204
SKIP DOWN
SW2207
DISC-5
SW2210
DISC-3
SW2213
STILL/PAUSE
0.51 - 1.53
SW2202
STOP
SW2205
SKIP UP
SW2208
DISC-4
SW2211
DISC-2
SW2214
EXTRA
CHANGE
1.54 - 2.57
SW2203
PLAY
SW2206
SELECT
SW2209
OPEN/CLOSE
SW2212
DISC-1
-----
2.58 - 3.30 (KEY OFF) (KEY OFF) (KEY OFF) (KEY OFF) (KEY OFF)
IC3001
Terminal Voltage of Pins (38 - 42) on IC3001