Electrical Adjustments; Equipment Required; (Ps-81 Board) - Sony PCM-1630 Operation And Maintenance Manual

SECTION 3
ELECTRICAL ADJUSTMENTS
3-1. EOUIPMENTS REQUIRED
(1) DIGITAL DC VOLTMETER
Effective digits; more than 4¥2 digits
Accuracy; less than 0.02% ±1 count
(2) STANDARD SIGNAL GENERATOR
Hewlet-Packard Model3325A
(3) NTSC TEST SIGNAL GENERA TOR
Tektronix 1410
Plug in Unit; SYNC GENERATOR SPG 1/2
(4) AF OSCILLATOR
Tektronix Model SG505
(5) DISTORTION METER
Tektronix Model AA501
(6) FREQUENCY COUNTER
Hewlet-Packard Model 5315A/OPT003
(7) OSCILLOSCOPE
Tektronix Model475A
(8) EX-71 EXTENSION BOARD
Sony Part No. A-7850-303-A
One EX-71 board is supplied with PCM-1630.
(9) ADJUSTMENT SCREWDRIVER
Sony Part No. 7-700-733-01
3·2. +5V·±22V VOLTAGE ADJUSTMENT
(PS-81 BOARD)
Equipment: Digital DC Voltmeter
EX-71 Extension Board
Connection: Apply the line voltage set by the voltage
selector to the unit.
Adjustment
1. Insert the EX-71 extension board into the AD-23
board slot in the card rack.
2. Put the AD-23 board on the extension board.
3. Measure the following check points.
PCM-1630 (UC/AEP)
3-1
Check Points
Voltage
(AD-23)
Adjustment
Specifications
+ GND
(PS-81)
+5V
A47·48 A49·50
RVl
+5V±0.05V
B47•48 B49·50
+22V
A3·B3
Al•2
Bl·2
RV2
+22V±0.2V
-22V A4·B4
Al·2
-22
v
± 0.3
v
-
Bl·2
Note:-22 V must be checked only because it is linked with
+22V.
Adjustment Location
RV2 RV1 PS-81 board
Heat sink
4. Insert the EX-71 extension board into each AD-23,
DEC-15 and MT-16 board slot.
5. Put each AD-23, DEC-15 and MT-16 board o.n the
extension board and check the following voltages.
Check Points
Voltage Specifications
Board Name + GND
-8V
AD-23 A6·B6 A5·B5
-8
v
± 0.3
v
+12V DEC-15 A3·B3
Al·2
+12V±0.5V
Bl·2
-12V DEC-15 A4·B4
Al·2
-12V±0.5V
Bl·2
+5V
MT-16 A46·B46
A49·50
+5
v
± 0.2
v
B49·50