Confirmation And Adjustment Of; Secondary Power Supply Voltage; Dne-1000 - Sony DNE-1000 Maintenance Manual

1-11. Confirmation and Adjustment of

Secondary Power Supply Voltage

1-11-1. DNE-1000

DNE-1000 has the power supply of +5 V(A), +5 V(B),
_5 V, and +12 V.
The power indicator is used the +5 V(A) and the fan is
used the +12 V.
After the attachment of all required boards are completed,
confirm the power supply voltage in the unit as described
below.
1. Confirmation for voltage of +5 V(A), +5 V(B),
and _5 V
The check terminals to attach the probes of a digital
voltmeter for the voltage measurement of the +5 V (A), +5
V (B) and _5 V are mounted on the IO-122 and VIF-12
boards.
[Check procedures]
1. Open the front panel. (Refer to the section 2-2-1.)
2. Confirm that the power supply unit is properly inserted
and securely fixed with the four screws.
3. Turn ON the power and confirm that the eight CPU
(*1)
RUN indicators on the CPU-211 board light up.
(*1) : CPU RUN indicators
D403, 404, 405, 416, 501, 601, 701 and 803 (A3
and A4) on the CPU-211 board
4. Remove the five screws (BVTT 3
retainer.
n
Never attach the digital voltmeter without removing
the board retainer. There is danger of causing a short
circuit between check terminals and board retainer.
5. Connect the digital voltmeter between check terminals
on each board. Confirm that the voltage values of
each check terminal meet the following specifications.
Voltage Specification
+5.00 ± 0.05 V
+5 V(A)
+5.00 ± 0.05 V
+5 V(B)
_5.00 ± 0.05 V
_5 V
DNE-1000
x 5) and the board
Check terminal
IO-122 board
CN4 (+5 V) ↔ CN5 (GND)
VIF-12 board
CN4 (+5 V) ↔ CN8 (GND)
VIF-12 board
CN5 (_5 V) ↔ CN8 (GND)
1-11. Confirmation and Adjustment of Secondary Power Supply Voltage
CPU-211 board
D403
D601
D405
D701
CN21
(+5 V)
CN20
(GND)
IO-122 board
CN4
CN5
(+5 V)
(GND)
D201
D202
D203
D204
D205
D206
D207 D208
D102
D101
D103
D104
D105
D106
D107 D108
D110
D109
D112
D111
(A side/component side)
Adjustment potentiometer
1RV1
1RV2
1RV3
D501
D404
D416
D803
(A side/component side)
VIF-12 board
CN5
(_5 V)
CN4
(+5 V)
CN8
(GND)
(A side/component side)
1-29(E)