Kenwood CS-4125A, CS-4135A Schematic

20MHz/40MHz OSCILLOSCOPE

CS-4125A CS-4135A

SERVICE MANUAL

KENWOOD TMI CORPORATION

© 2002-2/B51-1159-00 (K/K)

FILTER		PUSH KNOB		KNOB
(B11-0540-04)		(K24-3028-03)		(K29-7253-03)

40MHz OSCILLOSCOPE CS-4135A

MODE		SOURCE
AUTO NORM FIX TV-F TV-L		VERT CH1 CH2 LINE
	ON
	OFF
CH1 ALT CHOP ADD CH2	CH2 INVERT	SLOPE
VERT	ON
MODE	OFF

CH1 or Y			CH2 or X
	POSITION		POSITION
2 3			2 3
VARIABLE			VARIABLE
VOLTS / DIV			VOLTS / DIV
.2	.1 50	20 m V	.2 .1 50	20 m V
.5	.	. 10	.5	. 10
1		BAL		BAL
		5		5
2	5 1	2	1	2
		CAL		CAL
AC	GND	DC		DC

H O R I Z O N T

POSITION

3

SWEEP

ms

2 1

	5
	10
	20
	50	1
	1
S	5	5
		2
x 10 MAG
	ON/	OFF

POWER	CAL	ILLUM	FOCUS	INTEN	CH2	EXT TRIG
				CH2
				INPUT		INPUT
	~			400V	400V	42V
		1KHz		PK MAX	MAX	PK MAX
	1V p-p ~

TRACE ROTA CAT 1 1

POWER SWITCH		RUBBER FOOT ; FRONT		KNOB		KNOB		MOLD PANEL
(S68-0687-05)		(J02-0525-33)		(K29-7255-03)		(Large ; K29-7256-03)		(CS-4125A ; A63-0436-01)
						(Small ; K29-7254-03)		(CS-4135A ; A63-0437-01)

REAR PANEL (A83-0236-12)

	CHI	Z . AXIS INPUT
	OUTPUT
		42V˚ PK MAX
	WARNING

TO AVOID ELECTRIC SHOCK THE POWER CORD PROTECTIVE

GROUNDING CONDUCTOR MUST BE CONNECTED TO GROUND.

F O R C O N T I N U E D P R O T E C T I O N A G A I N S T F I R E , R E P L A C E O N L Y

W I T H F U S E O F T H E S P E C I F I E D V O L T A G E A N D C U R R E N T R A T I N G S .

D I S C O N N E C T P O W E R S U P P L Y B E F O R E R E P L A C I N G F U S E .

SELECTOR	~LINE VOLTAGE FUSE 250V
100	100V	T A	D O N O T
120	120V		R E M O V E C O V E R .
220	220V	T A	R E F E R S E R V I C I N G
230	230V		T O Q U A L I F I E D P E R S O N N E L .

SERIAL

50/60Hz MAX W

KENWOOD TMI CORPORATION

100

230

220

120

RUBBER FOOT ; REAR		AC SELECTOR		CORD WRAP
(J02-0565-04)		(E68-0619-05)		(W01-0529-08)

CS-4125A/CS-4135A

WARNING

The following instructions are for use by qualified personnel only. To avoid electric shock, do not perform any servicing other than contained in the operating instructions unless you are qualified to do so.

	CONTENTS
SPECIFICATIONS ..........................................................................................................	3
SAFETY ..........................................................................................................................	6
CIRCUIT DESCRIPTION ................................................................................................	7
BLOCK DIAGRAM ........................................................................................................	10
ADJUSTMENT ..............................................................................................................	12
PARTS LIST(UNIT).......................................................................................................	20
PARTS LIST (ELECTRICAL) ........................................................................................	22
SCHEMATIC DIAGRAM ...............................................................................................	48
P.C. BOARD .................................................................................................................	64

LOW CAPACITY PROBE

Earth clip

PC-54

Atenuation	Trimmer
Selector switch

2

CS-4125A/CS-4135A

SPECIFICATIONS

	ITE MS				CS -4125A		CS -4135A
CRT
Type					Rectangular with internal graticule
Acceleration Voltage					Approx. 2kV		Approx. 12k V
Display Area					8 x 10 di v (1 div = 10 m m)
V E RTICAL AXIS		(CH1 a nd CH2)
Sensitivity					1 mV, 2 mV/div ±5% , 5 mV/div to 5 V /div ±3%
Attenuator					1-2-5 step, 12 ranges with fine adjustment
Input Impedance					1 MΩ ±2% , Approx. 23 pF
Frequency Respons e
	5 mV/div to 5 V /div			DC: DC to 20 M Hz, within –3 dB			DC: DC to 40 M Hz, within –3 dB
				AC: 10 H z to 20 M Hz, within –3 dB			AC: 10 H z to 40 M Hz, within –3 dB
	1 mV/div, 2 mV/div				DC: DC to 5 MHz, within –3 dB
					AC: 10 H z to 5 MHz, within –3 dB
Rise Time
	5 mV/div to 5 V /div				Approx. 17. 5 ns (20 MHz)		Approx. 8. 75 ns (40 MHz)
	1 mV/div, 2 mV/div				Approx. 70 ns (5 MHz)
Crosstalk					-40 dB maximum
Operating Modes				CH1	: CH1 signal trance
				CH2	: CH2 signal ttrance
				ALT	: Alternating display of two signals
				CHOP : Chopped display of two signals
				ADD	: Display of combined C H1 + CH2 waveforms
CHOP Frequency					A pprox. 250 k Hz
Channel Polarity					Normal or inverted, channel 2 only inverted
	Maximum Input Voltage				800 V peak to peak or 400 V (DC + AC peak)
	(peak to peak)
HORIZO NTAL AXIS

Sensitivity

Input Impedance

Frequency response (-3 dB )

X-YPhase Difference

Operating Modes

Maximum Input Voltage

Same as vertical axis (CH2)

Same as vertical axis (CH2)

DC: DC to 500 k Hz

AC: 10 H z to 500 k Hz

3° or less at 50 kHz

X-Yoperation is selectable with X-Ysetting switch CH1: Y-axis

CH2: X-axis

Same as vertical axis (CH2)

SWEEP SYSTEM

Sweep Modes

Sweep Time

Sweep Magnification

Linearity

NORM: Triggered sweep

AUTO: Auto free run with no signal input

0.5 µs /div to 0. 5 s/div ±3% ,	0.2 µs /div to 0. 5 s/div	±3%
(0.2 µs /div: UNCAL)
1-2-5 step, 20 r anges with fine adjustment
10 x magnification, ±5%	10 x magnification,	±5%
(20 ns/div: UNCAL)
±3% (0.2 µs /div: UNCAL)	±3% , ( ±5% at x 10 MAG)
(±5% at x 10 MAG, 20 ns/div :UNCAL)

3

CS-4125A/CS-4135A

SPECIFICATIONS

ITE MS						CS -4125A					CS -4135A
TRIGGERING
Triggering Source				VERT	: Input signal selection with VERT MODE control
				CH1	: CH1 input signal
				CH2	: CH2 input signal
				LINE	: Commercial - use power source
				EXT	: Signal input through EXT TRIG terminal
External Trigger
Input Impedance								1 MΩ , Approx. 23 pF
Maximum Input Voltage							84 V peak to peak or 42 V			(DC + AC peak)
Trigger Coupling Modes							AUTO, NORM and FIXare capacitively coupled
					TV-F: Vertical sync pulses of a composite video signal
								are selected for triggering.
					TV-L: Horizontal sync pulses of a composite video signal
								are selected for triggering.
Trigger sensitivity
CS -4135A
MO DE		S IGNAL F RE Q .							S O URCE
								V E RT, CH1 , CH2			E XT
NORM		10 Hz to 20 M Hz						1.5 div.			0.25 V peak to peak
		20 MHz to 40 M Hz						2 div.			0.3 V peak to peak
AUTO						Same as above specs at 50 Hz or above
TV-F, TV-L		Composite video Signal						1div.			0.2 V peak to peak
FIX		50 Hz to 40 M Hz						2 div.			0.5 V peak to peak
Trigger sensitivity
CS -4125A
MO DE		S IGNAL F RE Q .							S O URCE
								V E RT, CH1 , CH2			E XT
NORM		10 Hz to 5 MHz						1 div.			0.2 V peak to peak
		5 MHz to 20 M Hz						1.5 div.			0.3 V peak to peak
AUTO						Same as above specs at 50 Hz or above
TV-F, TV-L		Composite video Signal						1div.			0.2 V peak to peak
FIX		50 Hz to 20 M Hz						2 div.			0.5 V peak to peak

4

RE GULATO RY INFO RMATIO N

LVD EN61010-1 (1993) + A2 (1995)

EMC EN61326-1 (1997) + A1 (1998) GROUP1 CLASS B EN61326-1 (1997) + A1 (1998) Min

The above specifications are subject to change without notice.

Probe (PC-54)

Instruction manual

Power cord

Replacement fuse

2

1

1

1

Line Frequency Power Consumption

ACCE S S O RIE S

AC 100 V / 120 V / 220 V / 230 V, 50 / 60 Hz

Max. 30 W

Line Voltage

Width

Height

Depth

Weight

Adjustment

Output Impedance

Output Voltage

Input Impedance

Sensitivity

Frequency

INTE NS ITY

Voltage

Waveform

CS-4125A/CS-4135A

SPECIFICATIONS

ITE MS		CS -4 1 2 5 A		CS -4 1 3 5 A
CALIBRATE D S IGNALS
		Positive square wave
		1 V peak to peak		±3%

Approx. 1 kHz

MO DULATIO N

				TTL level, decreases brightness
				Approx. 5 kΩ
	Usable Frequency Range			DC to 3.5 MHz
		Maximum Input Voltage		84 V peak to peak or 42 V (DC + AC peak)
	CH1 S IGNAL O UTP UT
				Approx. 50 mV/div	(at into 50 Ω load)
				Approx. 50 Ω
	Frequency Response			100 Hz to 10 MHz, ±3 dB	100 Hz to 20 MHz, ±3 dB
				(into 50 Ω load)	(into 50 Ω load)
	TRANCE RO TATIO N
				Adjustable semi-fixed resister on the front panel
	DIME NS IO NS / WE IGHT (			) dimensions include protrusion from basic outline dimensions.
				290 mm (290 mm)
				150 mm (172 mm)
				390 mm (443 mm)
				Approx. 6.6 kg	Approx. 6.9 kg
	E NV IRO NME NTAL
	Within Specifications			10 to 35 °C / 85% RH or less
	temp. / hum. range
	Full operation temp. / hum.			0 to 40 °C / 85% RH or less
	range
	E NV IRO NME NTAL (Indoor Use O nly)
				Altitude up to 2000 m
				OVER VOLTAGE CATEGORY ø
				POLLUTI ON DEGREE 2
	P O WE R S O URCE
					±10%

5

CS-4125A/CS-4135A

SAFETY

SAFETY

Before connecting the instrument to a power source, carefully read the following information, then verify that the proper power cord is used and the proper line fuse is installed for power source. The specified voltage is shown on the rear panel. If the power cord is not applied for specified voltage, there is always a certain amount of danger from electric shock.

Line voltage

This instrument operates using ac-power input voltages that 100/120/220/230 V at frequencies from 50 Hz to 60Hz.

Power cord

The ground wire of the 3-wire ac power plug places the chassis and housing of the oscilloscope at earth ground. Do not attempt to defeat the ground wire connection or float the oscilloscope ; to do so may pose a great safety hazard. The appropriate power cord is supplied by an option that is specified when the instrument is ordered.

The optional power cords are shown as follows in Fig.1

Line fuse

The fuse holder is located on the rear panel and contains the line fuse. Verify that the proper fuse is installed by replacing the line fuse.

Voltage conversion

This oscilloscope may be operated from either a 100V to 230V, 50/60 Hz power source. Use the following procedure to change from 100 to 230 volt operation or vice versa.

1.Remove the fuse holder.

2.Replace fuse F1 with a fuse of appropriate value, 1 amp for 100 VAC to 120 VAC operation. 630 m amp for 220 VAC to 230 VAC operation.

3.Reinsert it for appropriate voltage range.

4.When performing the reinsertion of fuse holder for the voltage conversion, the appropriate power cord should be used. (See Fig. 1.)

	Plug configuration	power cord and plug type	Factory installed	Line cord	Parts No. for
			instrument fuse	plug fuse	power cord
		North American	0.7A, 250V
		120 volt/60 Hz	slow blow	None	E30-1951-05
		Rated 15 amp	5x20mm
		(12 amp max ; NEC)
		Universal Europe	0.3A, 250V	None
		220 volt/50 Hz	slow blow		E30-1952-05
		Rated 16 amp	5x20 mm
		U.K.	0.3A, 250V	5A
		240 volt/50 Hz	slow blow		E30-1963-15
				Type C
		Rated 5 amp	5x20 mm
		Australian	0.3A, 250V	None
		240 volt/50 Hz	slow blow		E30-1953-05
		Rated 10 amp	5x20 mm
		North American	0.3A, 250V
		240 volt/60 Hz	slow blow	None	–
		Rated 15 amp	5x20mm
		(12 amp max ; NEC)
		Switzerland	0.3A, 250V		–
		230 volt/50Hz	slow blow	None
		Rated 10 amp	5x20 mm

Fig.1 Power Input Voltage Configuration

6

CS-4125A/CS-4135A

CIRCUIT DESCRIPTIONS

Vertical Attenuator Circuit

The attenuators of channel 1 and 2 basically consist

of rotary switches and passive elements (resistors, condensers, and trimmer condensers) on PC boards. The resistors have a precision of 0.5% for minimizing any error between the steps of the attenuators.

Vertical input signals from the BNC input receptacle enter the first-stage attenuator circuit, along the path selected by the AC - GND - DC switch. Then they pass through either attenuator 1/1, 1/10, or 1/100, along the path selected by the vertical rotary switch, and become input into the 1st preamplifier (first - stage buffer amplifier).

The 1st preamplifier consists of IC1 (CH2: IC2) hybrid IC. The element used for IC1 features a wide dynamic range and minimized temperature drifting. IC1 functions in the preamplifier as a circuit in which temperature drifting is considered. Input signals, impedance converted in this buffer amplifier, arc sent to the second - stage attenuator where they are passed through either attenuator 1/1, 1/2, 1/4, or 1/10. They are then sent to the vertical amplifier. The second-stage attenuator constitutes a low impedance resistance network with favorable frequency characteristics. The resistors used, as is those of the first stage attenuator, have a precision of 0.5% for minimizing any error between the steps of the attenuators. The rotary switches in this stage include one which increases the gain of the preamplifier to 5- fold when the sensitivity is 1 mV/div or 2 mV/div. IC1 and IC2 have the protection circuit to a large incoming signal.

TC1(51) and TC3(53) are input capacitance regulators for attenuator 1/10 and 1/100, respectively; while TC2(52) and TC4(54) are 1 kHz square wave characteristic regulators for attenuator 1/10 and 1/100. VR1(51) and VR2(52) are step DC balance regulators for attenuators, the former is for user use with adjustment enabled from the front panel.

Vertical Preamplifier Circuit

Signals output from the attenuator circuits are then input into the 2nd preamplifier which consists of a IC3(CH2:IC4) hybrid IC. This IC , with a gain of approximately 12fold , is an amplifier for suppressing DC level temperature drifting. When the sensitivity is either 1 mV/div or 2 mV/div, the gain is further increased another 5-fold(sum of approximately 60-fold) as a result of the gain resistivity of IC3(CH2:IC4) being switched over by the second attenuator switches S1(CH2:IC4) d and e. VR3(53) is the regulator for the DC offset which occurs during this time. Setting the 5 - fold gain is done by a resistor with a 1% precision and a non-regulated operation is achieved. VR4(54) and VR5(55) are 1 kHz square wave characteristic regulators for the sensitivity of 1 mV/div and 10mV/div. TC501(CH2, TC502) are frequency characteristic regulators. Signals which become sufficiently amplified in the 2nd preamplifier pass through the variable circuit of the vertical axis sensitivity, constituted by the volume of the attenuator rotary switch, and then become input into the 3rd amplifier. The 3rd amplifier is a IC5(CH2:IC6) hybrid IC. Signals input into this amplifier become as complementary signals and are output to the 4th amplifier as electric current signals.

The IC contains the CH1(CH2) position circuit, CH2 INV circuit, and CH switch circuit. These are controlled by the CH1(CH2) position volume and CH2 INV switch on the panel unit and the vertical mode switch signals coming from the horizontal side.

VR57 is a sensitivity regulator for CH2 signals while TC6 and TC56 are frequency characteristic regulators for CH1 and CH2, respectively.

CH1(CH2) trigger signals from the 3rd terminal of IC5(CH2:IC6) become amplified in the feedback amplifier in Q16 (19). These trigger signals are converted into electric current signals in Q17 (20) and sent to the trigger source switch on the horizontal side. CH1 trigger signals become amplified between the collector of Q16 and Q18 and in turn become output as CH1 out signals via the emitter follower of Q23. In contrast, CH2 trigger signals become amplified between the collectors in Q19 to Q21, become X - axis signals by being passed through the emitter follower in Q22, converted into electric current signals in VR151 and R182, and in turn output into the horizontal signal switch circuit on the horizontal side. VR151 is the sensitivity regulator of X signals while VR152 is an X position regulator for regulating the DC level of X signals.

The electric current signals which were switched over in the 3rd amplifier are input into the 4th amplifier consisting of Q4 and Q5. After becoming amplified they are directly input into the output amplifier as voltage signals. The 4th amplifier is a feedback amplifier which features minimized fluctuation in the frequency characteristics even when the 3rd amplifiers of CH1 and CH2 are parallel-connected during ADD. Also, the vertical output amplifier can be driven by low output impedance.

Q3 becomes turned on during ADD. The operating current is passed through R103, R104, and VR101 so that the operating current in the 4th amplifier does not become fluctuated when the operating currents from the 3rd amplifiers of CH1 and CH2 flow into the 4th amplifier. VR101 is the ADD balance regulator.

VR102 is the balance regulator of +Y and -Y on the CRT.

Adjustment is made so that the luminescent line comes to the center of the CRT.

Vertical Output Amplifier Circuit

Signals output from the 4th amplifier are amplified about 45 - fold in the output amplifier, Q6 through Q15, and drive the Y deflecting plate of the CRT.

This output amplifier is a feedback amplifier. The final stage Q12 and Q14 are driven by complimentary emitter followers Q8 and Q10, Q9 and Q11, respectively. By doing so, the linearity of the first and last transition high frequencies is improved and the input impedance is made higher. Q13 and Q15 work to obtain sufficient gain during constant current loss in Q12 and Q14, respectively. Negative feedback is sufficiently applied as well. Consequently, this circuit achieves low impedance output of large amplitude signals with good linearity.

VR103 is a sensitivity regulator based on CH1 signals for the entire vertical amplifier. TC101 is a frequency characteristic regulator for the entire vertical amplifier in general and for the output amplifier in particular. VR104

7

CS-4125A/CS-4135A

CIRCUIT DESCRIPTIONS

is the operating point voltage regulator for the output amplifier.

Horizontal System

The horizontal system can be roughly divided into the trigger circuit, sweep circuit, output circuit, and blanking circuit. The TRIG SOURCE switch on the panel unit drives trigger sources switch circuits IC207 (hybrid IC), D202-D205, and Q202. Desired trigger signals can be elected. The trigger source switch circuit is connected to an input buffer for trigger signals from each channel coming from the vertical amplifier, line trigger signals from the power source system, and external synchronizing signals generated in Q201.

Selected synchronizing signals are sent to the trigger level setting circuits Q203 - Q206 and IC202c via the emitter follower in Q203. The trigger level setting circuit constitutes a Schmitt circuit and its threshold level

can be adjusted by	VOLUME for trigger level setting on
the panel unit. The	trigger level becomes fixed voltage

when the switch in the MODE of a panel side is a fix trigger. VR250 is adjusted so that trigger may start a voltage value in the center of sin wave only at the time of fix.

Selected synchronizing signals are sent to Q207 - Q211 for video - sync separation via C206, Q207, D206 and D207 are polarity switch circuits and Q209 is a sync tip clamper. Q211 is a switch circuit for vertical synchronizing signal separation.

Either ordinary synchronizing signals or video - sync signals become selected at IC202a. IC203a, for MODE switch selecting on the panel unit and the sweep gate flip - flop becomes activated.

Gate signals from IC204b, IC205b turn Q221 ON/OFF in both AUTO and NORM modes and control the sweep HIC in IC201. The interior of IC201 comprises a constant - current charged type ramp wave generating circuit and its time constant becomes determined by an S201 code and C215 or C216. If the S201 code is below 1 ms/div, the time constant adjustment circuit in Q219 becomes activated and VR201 contributes in determining the time constant as well.

If there are no trigger signals during the AUTO mode, the AUTO circuits in Q212-Q215 work and generate sweep gates automatically.

IC201 does not generate ramp waves as the sweep gate become shut by IC205b in the X - Y mode.

Q216 - Q218, Q511, IC205c and IC205d determine the upper limit and hold off time of ramp waves.

Ramp waves from IC201 become output as sweep signals via Q222. Sweep signals and X - axis signals, the latter from the vertical system, become selected by switching circuit Q223, Q224, Q226, and Q227. They are then applied to output systems after Q301.

Horizontal Output Circuit

When horizontal signals are input into Q301 and voltage signals, corresponding to the horizontal position, are input into Q302, differential signals become generated by the collectors in Q307 and Q308, Q309 and Q310. Q303 - Q310 are feedback amplifiers for constant - current load.

They constitute horizontal output amplifiers which feature good linearity and low power consumption. Q315 and Q316 become conductive during X10MAG and increase the horizontal amplifier gain to 10 - fold.

Signals from the horizontal output amplifier are sent to the horizontal deflecting plate of the CRT.

Blanking Circuit

Blanking system circuits generate blanking signals for the CRT and signals which switch each channel in the vertical system. The selected signals are divided into 1/2 in IC204b, which is T - shaped flip - flop connected, and become channel switching signals.

In contrast, signals from the CHOP transmitter and sweep gate negative - phase signals (IC204b Q - signals) are turned into blanking signals in Q230 and IC205a. They are then sent to the blanking amplifier in the power supply system.

Chop Circuit

A CHOP transmitter constitutes IC206a and IC206b. CHOP circuit operates, only when a setup of a panel unit is CHOP sweep.

VERT MODE Circuit

Signals from the CHOP transmitter and sweep gate signals become selected at IC202b, IC203b, whereby CHOP signals are selected during a CHOP operation, while sweep gate signals are selected during an ACT operation. IC204a outputs the change signal of vertical amplifier according to the signal from IC203b, and the state of a setup of a panel unit.

Low Voltage Circuit

[CS-4125A]

The power supply consists of four regulated circuits and two non - regulated circuits. IC1 constitutes an HIC for controlling 4 circuit lines consisting of those for +8 V(Q4, D4), -8 V(Q5, D5), +140 V(Q1, Q2, D3), +5 V(Q3), each voltage becomes determined based on -8 V. VR1 adjusts to -8 V. The +10 V circuits, D6 and C10, are unstable and constitute a power source for the horizontal sweep HIC. The ±10 V generated with D2, C2 and C3 is a non-regulated power which is supplied to high - voltage oscillation circuit and trance rotation circuit. [CS-4135A]

The power supply consists of five regulated circuits and two non-regulated circuits. IC1 constitutes an HIC for controlling 4 circuit lines consisting of those for +8 V(Q4, D4), -8 V(Q5, D5), +140 V(Q1, Q2, D3), +5 V(Q3), each voltage becomes determined based on -8 V. VR1 adjusts to -8V . The +80 V power is generated by Q31 to Q33 using the +8 voltage as the reference. The +10 V circuits, D6 and C10, are unstable and constitute a power source for the horizontal sweep HIC. The ±10 V generated with D2, C2 and C3 is a non-regulated power which is supplied to the scale illumination circuit, highvoltage oscillation circuit and trance rotation circuit.

8

CS-4125A/CS-4135A

CIRCUIT DESCRIPTIONS

High Voltage Blanking Circuit

Q8 oscillates at approximately 50 kHz applying the reactance of the converter transformer. The oscillation voltage appearing in the high voltage coil are turned into stable.

[CS-4125A)

The oscillation voltage appearing in the high-voltage coil are turned into stable -1800 V in the voltage doubler rectifier circuits C25, C26, D9, and D10, and in rectifier circuits Q9 and IC2a.

[CS-4135A]

The oscillation voltage appearing in the high - voltage coil is subjected half - wave rectification then turned into regulated -1500 V by the control circuit formed of Q9 and IC2a.

The voltage across the anode and cathode is about 12 kV. [ both ]

On the secondary side of the converter transformer, there is the coil for the CRT heater for turning the heater on via R52.

Voltage signals, approximately 300 V peak to peak, become extracted from the high voltage coil and used as modulated signals for blanking. This is necessary for employing signals from blanking amplifiers Q15, Q6, and Q7 for the cathode potential.

The modulated signals drive the DC regeneration circuits, D11 - D14, C23 and C24, and provide signals for controlling the brightness of the CRT G1 electrode.

Q10 - 12 are transistors for controlling the focus and they achieve high pressure resistance by being cascade connected.

CAL Circuit

[CS-4125A]

IC71a is a transmitter. Oscillation frequency is decided by surrounding CR. Q71 is the signal outputted from a transmitter, and is the transistor which switch. Output level is decided by voltage of R82, D71, R83, and +140 V when Q71 is OFF.

[CS-4135A]

IC31a is a transmitter. Oscillation frequency is decided by surrounding CR. Q91 is the signal outputted from a transmitter, and is the transistor which switch. Output level is decided by voltage of R72, D91, R73, and +140 V when Q91 is OFF.

Trance Rotation Circuit

This circuit consists of a complementary circuit formed with Q13 and Q14 and drives the rotator coil located on the CRT cone by means of the current from their common emitter.

Scale Illumination Circuit

[CS-4135A]

Q34 and Q35, which are connected in parallel, handles the current flowing through the illumination lamps. They vary the scale illumination VR connected to their common base to control the brightness of the illumination lamps.

9

CS-4135A BLOCK DIAGRAM

X65-1500-00 A/2

X80-1550-00 B/4

CH2 INVERT

CH2

CH1

X80-1550-00

X80-1550-00 A/4

(OVERALL UNIT)

POSITION

POSITION

S206

C/4

VR205

VR204

TRACE

TRACE ROTA

ROTATION

ROTATION COIL

VR302

CIRCUIT

Q13,Q14

X65-1500-00

B/2

INPUT

VERTICAL

SCALE

CH1

AC GND DC

ATT.

ATT.

PRE AMP.

SELECTOR

ILLUM

ILLUMINATION

ILLUM. LAMP

BUFFER

OUT PUT AMP.

INPUT

S401

S1 first

S1 second

IC3

IC5

VR301

CIRCUIT

IC1

Q3,Q4~Q15

Q34,Q35

TRIG

CH1 OUT

Vertical

OUT PUT AMP.

FOCUS

BUFFER

Q18,Q23

FOCUS

Q16,Q17

CIRCUIT

VR303

Horizontal

Q10! Q12

INPUT

CH2

AC GND DC

ATT.

ATT.

PRE AMP.

SELECTOR

BLOCK

BUFFER

INPUT

S402

S2 first

S2 secound

IC4

IC6

IC2

X-AXIS

H

TRIG

BUFFER

INTEN

HIGH VOLTAGE

H

BUFFER

Q21,Q22

VR304

CIRCUIT

K

Q19,Q20

CHANNEL

IC2a,Q8,Q9

D11!

D14,T1

G1

CONTROL

P1

IC204a,IC206d

CRT

D218,D219

INVERT

VOLTAGE

DOUBLER

12kV

DIAGRAM

IC206d

RECTIFIER

A1

CHOP OSC.

ALT-CHOP

BLANKING

BLANKING

IC206a,b,c

G2

SELECTOR

SELECTOR

CRT

Q229

CIRCUIT

IC202b

IC205a,Q230

Q6,Q7,Q15

BIAS

X80-1550-00

IC203b

D221,D222

P2

VR4,R50,R51

SWEEP TIME

D/4

S201

Z.AXIS INPUT

CH1

OUTPUT

TV SYNC. SIGNAL

SEPARATOR

Q207~Q211

HORIZONTAL

REFERENCE

TRIG SOURCE

D206,D207

TRIG MODE

A SWEEP GATE

A SWEEP

HORIZONTAL

SIGNAL

VOLTAGE

SYNC. SIGNAL

SELECTOR

SELECTOR

CIRCUIT

CIRCUIT

OUTPUT AMP.

CAL

EXT TRIG

SELECTOR

GENERATOR

IC207,Q202

IC202a

IC204b

IC201

Q301~Q310

INPUT BUFFER

Q222~Q224

IC31a,Q91

INPUT

D202~D205

IC203a

IC205b

Q219~Q221

Q315,Q316

Q201,Q231

Q226~Q227

D17,D91

TRIG LEVEL

AUTO FREE RUN

IC202c,d

CIRCUIT

Q203~Q206

Q212~Q215

DC

D210

POWER TRANSFORMER

HOLD OFF

SWEEP END

CIRCUIT

DETECT

IC205c,IC205d

Q217

Q216,Q218,Q511

LOW VOLTAGE

CIRCUIT

IC1,Q1~Q5

Q31~Q33

D1~D6,D31

X80-1550-00 A/4

AC

	VERT MODE	SOURCE	SLOPE	TRIGGER	MODE	X-Y	HORIZONTAL	HORIZONTAL	" 10 MAG	POWER SWITCH
				LEVEL		S204,Q201	VARIABLE	POSITION		&
	S205	S201	S203		S202,D202				S403
				VR203		D201,D203	VR202	VR201		FUSE
									X65-1500-00
	X80-1550-00 B/4
									B/2

10

4135A-4125A/CS-CS

CS-4125A BLOCK DIAGRAM

X65-1490-00 A/2

X80-1540-00 B/4

CH2 INVERT

CH2

CH1

(OVERALL UNIT)

POSITION

POSITION

S206

VR205

VR204

X65-1490-00

B/2

CH1

AC GND DC

ATT.

INPUT

ATT.

PRE AMP.

SELECTOR

VERTICAL

BUFFER

OUT PUT AMP.

INPUT

S401

S1 first

S1 second

IC3

IC5

IC1

Q3,Q4~Q15

X80-1540-00

X80-1540-00 A/4

CH1 OUT

C/4

TRACE

TRIG

OUT PUT AMP.

TRACE ROTA

ROTATION

ROTATION COIL

BUFFER

Q18,Q23

VR302

CIRCUIT

Q16,Q17

Q13,Q14

CH2

AC GND DC

ATT.

INPUT

ATT.

PRE AMP.

SELECTOR

Vertical

BLOCK

BUFFER

INPUT

S402

S2 first

S2 secound

IC4

IC6

IC2a,Q8,Q9

IC2

K

X-AXIS

FOCUS

FOCUS

TRIG

BUFFER

CIRCUIT

VR303

Horizontal

BUFFER

Q21,Q22

Q10~Q12

CHANNEL

Q19,Q20

CONTROL

H

IC204a,IC206d

CRT

D218,D219

INTEN

HIGH VOLTAGE

H

VR304

CIRCUIT

SEPARATOR

INVERT

D11~D14,T1

G1

DIAGRAM

IC206d

P1

CHOP OSC.

ALT-CHOP

BLANKING

IC206a,b,c

BLANKING

G2

SELECTOR

SELECTOR

Q229

CIRCUIT

CRT

IC202b

IC205a,Q230

X80-1540-00

Q6,Q7,Q15

BIAS

IC203b

D221,D222

P2

VR4,R50,R51

D/4

SWEEP TIME

S201

Z.AXIS INPUT

CH1

OUTPUT

TV SYNC. SIGNAL

Q207~Q211

TRIG SOURCE

D206,D207

TRIG MODE

A SWEEP GATE

A SWEEP

HORIZONTAL

HORIZONTAL

REFERENCE

SIGNAL

VOLTAGE

SELECTOR

SELECTOR

CIRCUIT

CIRCUIT

OUTPUT AMP.

SYNC. SIGNAL

SELECTOR

GENERATOR

CAL

EXT TRIG

IC207,Q202

IC202a

IC204b

IC201

Q301~Q310

INPUT BUFFER

Q222~Q224

IC71a,Q71

INPUT

D202~D205

IC203a

IC205b

Q219~Q221

Q315,Q316

Q201,Q231

Q226~Q227

D17,D71

TRIG LEVEL

AUTO FREE RUN

IC202c,d

CIRCUIT

Q203~Q206

Q212~Q215

DC

D210

POWER TRANSFORMER

HOLD OFF

SWEEP END

CIRCUIT

DETECT

IC205c,IC205d

Q217

Q216,Q218,Q511

LOW VOLTAGE

CIRCUIT

IC1,Q1~Q5

D1~D6

X80-1540-00 A/4

VERT MODE

SOURCE

SLOPE

TRIGGER

MODE

X-Y

HORIZONTAL

HORIZONTAL

" 10 MAG

POWER SWITCH

LEVEL

S204,Q201

VARIABLE

POSITION

&

S205

S201

S203

S202,D202

S403

VR203

D201,D203

VR202

VR201

FUSE

	X80-1540-00 B/4	X65-1490-00
		B/2

11

4135A-4125A/CS-CS

CS-4125A/CS-4135A

ADJUSTMENT

To obtain the best performance, periodically calibrate the unit. Sometimes, only one mode need be calibrated, while at other times, all modes should be calibrated. When one mode is calibrated, it must be noted that the other modes may be affected. When calibrating all modes, perform the calibration in the specified sequence.

The following calibration required an accurate measuring instrument and an insulated adjusting flat blade screwdriver. If they are not available, contact your dealer. For optimum adjustment, turn the power on and warm up the scope sufficiently (more than 30 minutes) before starting. Before calibrating the scope, check the power supply voltage.

TEST EQUIPMENT REQUIRED

The following instrument or their equivalent should be used for making adjustment.

	Test Equipment	Model
	Digital Multi Meter	45
		(FLUKE)
	Pulse generator	PG-506
		(Tektronix)
	Time Marker	TG-501
		(Tektronix)
	Sine-wave Generator (1)	SG-503
		(Tektronix)
	Sine-wave Generator (2)	SG-502
		(Tektronix)
	Square Wave Generator	211B
		(HP)
	Capacitance meter	3520
		(HIOKI)
	Oscilloscope	2465B
		(Tektronix)
	Pattern generator	CG-911
		(KENWOOD TMI)
	Frequency counter	FC-756
		(KENWOOD TMI)
	CASE JIG	CASE JIGU 20M
		(KENWOOD TMI or H/C)

PREPARATION FOR ADJUSTMENT

Control Settings

The control settings listed below must be used for each adjustment procedure.

Exceptions to these settings will be noted as they occur. After completing a adjustment, return the controls to the following setting.

NAME OF KNOBS	POSITION
MODE	AUTO
X-Y	OFF
SOURCE	VERT
VERT MODE	CH1
CH2 INVERT	OFF
SLOPE	OFF (+)
TRIGGER LEVEL	12 O’clock
V.POSITION	12 O’clock (both CH1,
	2)
VOLTS/DIV	10mV (both CH1, 2)
VOLTS VARIABLE	CAL (both CH1, 2)
AC-GND-DC	DC (both CH1, 2)
H. POSITION	12 O’clock
SWEEP TIME VARIABLE	CAL
SWEEP TIME/DIV	0.1ms
SWEEP TIME/DIV MAG	OFF
(x10)

12

CS-4125A/CS-4135A

ADJUSTMENT

Item

Adjustment

Procedure

point

-8 V

VR1

[CS-4125A]

[CS-4125A]

The probe of multi-meter is applied to the CN8-4 (20M) of a power

X80-1540

supply unit, and it adjusts so that it may be set to –8.00 V.

[CS-4135A]

1

X80-1550

[CS-4135A]

The probe of multi-meter is applied to the CN11-6 (40 M) of a power

supply unit, and it adjusts so that it may be set to –8.00 V.

Adjustment range: -8.00 V to –8.05 V

CRT center

VR102

MODE : AUTO

VOLTS/DIV : 50mV (both CH)

[CS-4125A]

VERT MODE : CH2

VOLTS VARIABLE : CAL (both CH)

X65-1490

AC-GND-DC : GND

2

[CS-4135A]

X65-1500

1) CH2 INVERT is turned ON-OFF and the position which

luminescent line does not move is looked for by CH2 POSITION.

2) CH2 POSITION leaves as it is and adjusts luminescent line in the

scale center of CRT by VR102.

Operating point

voltage

VR104

[CS-4125A]

of vertical amplifier

[CS-4125A]

Adjust luminescent line to a CRT center.

X65-1490

In the state of two clauses, a main part is adjusted by VR104 so that

[CS-4135A]

the voltage of CN6-1 may be set to 67.00 V.

X65-1500

[CS-4135A]

Adjust luminescent line to a CRT center.

3

In the state of two clauses, a main part is adjusted by VR104 so that

the voltage of CN6-1 may be set to 37.50 V.

Adjustment range: [CS-4125A] 66.95 V to 67.05 V

[CS-4135A] 37.45 V to 37.55 V

*1. Carry out and adjust SWEEP TIME to 1ms in the state of sweep.

*2. Make it short-circuit, measure and adjust CN6-1 and 4.

Operating point

voltage

VR301

MODE : AUTO

VOLTS/DIV : 50 mV (both CH)

of horizontal amplifier

[CS-4125A]

VERT MODE : CH1

X-Y : ON

X65-1490

AC-GND-DC : GND

[CS-4135A]

4

X65-1500

1) Move the spot to the CRT center by operating the H.POSITION

controls.

2) It adjusts by VR301 so that the voltage of CN7-1 may be set to

68.00 V.

Adjustment range: 67.95 V to 68.05 V

* Make it short-circuit, measure and adjustment CN7-1 and 3.

ASTIG

VR4

FOUCUS : 12 o’clock

X-Y : ON

[CS-4125A]

X80-1540

A FOUCUS knob is the state at 12:00 position, and it adjusted by

5

[CS-4135A]

VR4 so that it may become the smallest about spot.

X80-1550

NG

NG

Best point

FOUCUS center

VR3

FOUCUS : 12 o’clock

X-Y : ON

[CS-4125A]

6

X80-1540

A FOUCUS knob is the state at 12:00 position, and it adjusted by

[CS-4135A]

VR3 so that it may become the smallest about spot.

X80-1550

13

CS-4125A/CS-4135A

ADJUSTMENT

Item

Adjustment

Procedure

point

INTEN

VR2

X-Y: ON

CS-4125A]

7

X80-1540

1) Spot is displayed on CRT and INTEN knob is made the position at

[CS-4135A]

9:00.

X80-1550

2) Adjust VR2 so that spot may disappear in the position at 9:00.

CH1 STEP ATT

VR2

MODE : AUTO

AC-GND-DC : GND

BALANCE

[CS-4125A]

VERT MODE : CH1

V OLTS/DIV : 2 mV

(CH1 1 mV to 2 mV)

X65-1490

8

[CS-4135A]

Adjust VR2 so that the luminescent line does not move when VOLTS

X65-1500

is switched from 1 mV to 2 mV.

* On the basis of 2 mV, it adjusts at the 1 mV time.

* CH1 STEP ATT BALANCE VR is united with a center. (mechanical)

CH1 STEP ATT

VR3

MODE : AUTO

AC-GND-DC : GND

BALANCE

[CS-4125A]

VERT MODE : CH1

VOLTS/DIV : 5 mV

(CH1 2 mV to 5 mV)

X65-1490

9

[CS-4135A]

Adjust VR3 so that the luminescent line does not move when VOLTS

X65-1500

is switched from 2 mV to 5mV.

* On the basis of 5 mV, it adjusts at the 2 mV time.

* Don’t touch CH1 STEP ATT BALANCE VR performed by 8 clauses.

CH2 STEP ATT

VR52

MODE : AUTO

AC-GND-DC : GND

BALANCE

[CS-4125A]

VERT MODE : CH2

VOLTS/DIV : 2 mV

(CH2 1 mV to 2mV)

X65-1490

10

[CS-4135A]

Adjust VR52 so that the luminescent line does not move when

X65-1500

VOLTS is switched from 1 mV to 2 mV.

* On the basis of 2 mV, it adjusts at the 1 mV time.

* CH2 STEP ATT BALANCE VR is united with a center. (mechanical)

CH2 STEP ATT

VR53

MODE : AUTO

AC-GND-DC : GND

BALANCE

[CS-4125A]

VERT MODE : CH2

VOLTS/DIV : 5 mV

(CH2 2mV to 5 mV)

X65-1490

11

[CS-4135A]

Adjust VR53 so that the

luminescent line does

not move when

X65-1500

VOLTS is switched from 2 mV to 5 mV.

* On the basis of 5 mV, it adjusts at the 2 mV time.

* Don’t touch VR of CH2 STEP ATT BALANCE performed by 10

clauses.

ADD POSI

VR101

MODE : AUTO

AC-GND-DC : GND (both CH)

[CS-4125A]

VERT MODE : ALT

VOLTS/DIV : 10 mV (both CH)

X65-1490

12

[CS-4135A]

1) In the state of ALT, luminescent line of CH1 and CH2 is united in

X65-1500

the center of CRT by V. POSITION.

2) VERT MODE is switched to ADD, and it adjusts by VR101 so that

luminescent line may become in the center.

CH1 10 mV, 1 mV

10 mV: VR5

MODE : AUTO

AC-GND-DC : DC

Square wave

1 mV: VR4

VERT MODE : CH1

VOLTS/DIV : 10 mV, 1 mV

[CS-4125A]

SWEEP TIME : 0.5 ms

X65-1490

[CS-4135A]

1) Input a 1 kHz square wave signal to the CH1 INPUT (6 div. input)

13

X65-1500

2) Adjust each VR so that the waveform is flat.

NG

OK

NG

6 div.

14

CS-4125A/CS-4135A

ADJUSTMENT

Item

Adjustment

Procedure

point

CH2 10 mV, 1 mV

10 mV: VR55

MODE : AUTO

AC-GND-DC : DC

Square wave

1 mV: VR54

VERT MODE : CH2

VOLTS/DIV : 10 mV, 1 mV

[CS-4125A]

SWEEP TIME : 0.5 ms

X65-1490

[CS-4135A]

1) Input a 1 kHz square wave signal to the CH2 INPUT. (6 div. input)

14

X65-1500

2) Adjust each VR so that the waveform is flat.

NG

OK

NG

6 div.

CH1 V. GAIN

VR103

MODE : AUTO

AC-GND-DC : DC

[CS-4125A]

VERT MODE : CH1

VOLTS/DIV : 20 mV

X65-1490

SOURCE : VERT

VOLTS VARIABLE : CAL

[CS-4135A]

15

X65-1500

1) Input 1 kHz and 100 mV square wave signal to the CH1 INPUT.

2) Adjust VR103 so that the amplitude is 5div. (20 mV)

5 div.

CH2 V. GAIN

VR57

MODE : AUTO

AC-GND-DC : DC

[CS-4125A]

VERT MODE : CH2

VOLTS/DIV : 20 mV

X65-1490

SOURCE : VERT

VOLTS VARIABLE : CAL

[CS-4135A]

16

X65-1500

1) Input 1 kHz and 100 mV square wave signal to the CH2 INPUT.

2) Adjust VR57 so that the amplitude is 5 div. (20 mV)

5 div.

CH1, 2 TRIG level

VR6

MODE : AUTO

AC-GND-DC : AC

[CS-4125A]

VERT MODE : ALT

VOLTS/DIV : 10 mV

X65-1490

SOURCE : VERT

VOLTS VARIABLE : CAL

[CS-4135A]

X65-1500 1) 1 kHz and 6 div. sine wave are inputted into CH1 and CH2 INPUT.

2) AC-GND-DC is set to GND, V. POSITION is adjusted so that

luminescent line of CH1 and CH2 may overlap, and AC-GND-DC

is set to AC.

17

3) VR6 is adjusted so that the starting point of the waveform of CH1

and CH2 may overlap.

After adjustment O.K. state

6 div.

A starting point is united.

15

					CS-4125A/CS-4135A
			ADJUSTMENT
	Item	Adjustment				Procedure
		point
	FIX TRIG level	VR250
					MODE : FIX	AC-GND-DC : AC
		[CS-4125A]
					VERT MODE : CH1	VOLTS/DIV : 10 mV
		X65-1490
					SOURCE : VERT	VOLTS VARIABLE : CAL
		[CS-4135A]
					SLOPE : + (OFF) -(ON)
		X65-1500

1)MODE is set to AUTO, AC-GND-DC is set to GND, and set the luminescent line to the center of the scale of CRT by operating V.POSITION.

2)AC-GND-DC is set to AC and sine wave of 1 kHz and 6 div. is inputted into CH1 INPUT.

	3) When MODE is set to FIX and wavelike starting point level
18	changes SLOPE ON/OFF, it adjusts by VR250 so that the width
	from the center of a CRT scale may become equal.
			SLOPE	After adjustment O.K. state
			:OFF SIDE

6 div.

SLOPE

:ON SID E

The st art ing point here is SL OPE: When ON and OFF are

changed, it unit es so th at th e w idth fr om a CRT scale center may become equal.

CH1 waveform shaping

0.1 V : TC2

MODE : AUTO

AC-GND-DC : DC

1

V : TC4

VERT MODE : CH1

VOLTS/DIV : 10 mV(Ideal waveform)

[CS-4125A]

SOURCE : VERT

VOLTS VARIABLE : CAL

X65-1490

[CS-4135A] 1) Input a 1 kHz square wave signal to the CH1 INPUT. (5 div. input)

X65-1500

2) Adjust each TC so that the waveforms at 0.1 V range and 1 V

19

range are flat.

NG

OK

NG

5 div.

CH2 waveform shaping

0.1 V : TC52

MODE : AUTO

AC-GND-DC : DC

1

V : TC54

VERT MODE : CH2

VOLTS/DIV : 10 mV(Ideal waveform)

[CS-4125A]

SOURCE : VERT

VOLTS VARIABLE : CAL

X65-1490

[CS-4135A] 1) Input a 1 kHz square wave signal to the CH2 INPUT. (5 div. input)

X65-1500

2) Adjust each TC so that the waveforms at 0.1 V range and 1 V

20

range are flat.

NG

OK

NG

5 div.

	CH1 input capacity	0.1 V : TC1
		1V : TC3
		[CS-4125A]
		X65-1490
21		[CS-4135A]
		X65-1500

MODE : AUTO	AC-GND-DC : DC
VERT MODE : CH1	VOLTS/DIV : 10 mV (standard)
SOURCE : VERT	VOLTS VARIABLE : CAL

1)Connect a capacity meter to the CH1 INPUT.

2)Measure the capacity of the 10 mV range. (Less than 24 pF ±3 pF)

3)At 0.1 V and 1 V adjust each TC to obtain the same values as 10 mV.

16

CS-4125A/CS-4135A

ADJUSTMENT

	Item	Adjustment	Procedure
		point

	CH2 input capacity	0.1 V : TC51
		1 V : TC53
		[CS-4125A]
		X65-1490
22		[CS-4135A]
		X65-1500

MODE : AUTO	AC-GND-DC : DC
VERT MODE : CH2	VOLTS/DIV : 10 mV (standard)
SOURCE : VERT	VOLTS VARIABLE : CAL

1)Connect a capacity meter to the CH2 INPUT.

2)Measure the capacity of the 10 mV range. (Less than 24 pF ±3pF)

3)At 0.1 V and 1 V adjust each TC to obtain the same value as 10mV.

SWEEP TIME (0.1 ms)	VR202	MODE : AUTO	AC-GND-DC : DC
	[CS-4125A]
		VERT MODE : CH1	SWEEP TIME/DIV : 0.1 ms
	X65-1490
		SOURCE : VERT	H. VARIABLE : CAL
	[CS-4135A]
	X65-1500	1) Input a 0.1 ms marker signal to the CH1 INPUT.
		2) Adjust VR202 so that	the marker peak and scale coincides at
23		every div. (Since a marker signal moves horizontally at this time,
		operate it by H.POSITION)

		1st signal	11st signal
SWEEP TIME (2 ms)	VR201
		MODE : AUTO	AC-GND-DC : DC
	[CS-4125A]
		VERT MODE : CH1	SWEEP TIME/DIV : 2 ms
	X65-1490
		SOURCE : VERT	H. VARIABLE : CAL
	[CS-4135A]
	X65-1500	1) Input a 2 ms marker signal to the CH1 INPUT.
		2) Adjust VR201 so that the marker peak and scale coincides at
24		every div. (Since a marker signal moves horizontally at this time,
		operate it by H.POSITION.)

		1st signal	11st signal
MAG GAIN	VR302
		MODE : AUTO	AC-GND-DC : DC
	[CS-4125A]
		VERT MODE : CH1	SWEEP TIME/DIV : 0.1 ms
	X65-1490
		SOURCE : VERT	H. VARIABLE : CAL
	[CS-4135A]
	X65-1500	1) Input a 0.1 ms marker signal to the CH1 INPUT.

2)Adjust so that the marker peak and scale coincides at every div. operating by H.POSITION.

3)x10 MAG switch is ON and adjust VR302 so that the interval between two peaks is 10 div.

	At t he t im e of
25	x10 MAG OFF

t im MAG

17

					CS-4125A/CS-4135A
			ADJUSTMENT
	Item	Adjustment				Procedure
		point
	MAG center	VR303
					MODE : AUTO	AC-GND-DC : DC
		[CS-4125A]
					VERT MODE : CH1	SWEEP TIME/DIV : 0.1 ms
		X65-1490
					SOURCE : VERT	H. VARIABLE : CAL
		[CS-4135A]
					x 10 MAG : ON
		X65-1500

1)Input a 0.5 ms marker signal to the CH1 INPUT.

2)Adjust H.POSITION so that the center peak is aligned with the vertical scale center.

3)x 10 MAG switches OFF, and adjust VR303 so that the center

peak of marker signal is aligned with vertical scale center. * Since a gap arises, adjust twice.

26

At the time of x10 MAG ON

At the time of x10 MAG OFF

X. GAIN	VR151	MODE : AUTO		CH2 AC-GND-DC : AC
	[CS-4125A]
		VERT MODE : CH2		CH2 VOLTS/DIV : 10 mV
	X65-1490
		SOURCE : VERT		H. VARIABLE : CAL
	[CS-4135A]
		X-Y : ON
	X65-1500
		1) Input a 50 mV square wave signal to the CH2 INPUT.
		2) VR151 is adjusted so that amplitude may be set to 5 div.
27		* Make the adjustment to 5 div., at the CRT center.

3 div.

2 div.

X. POSITION	VR152
	[CS-4125A]
	X65-1490
	[CS-4135A]
	X65-1500

28

MODE : AUTO	AC-GND-DC : AC (both CH)
VERT MODE : CH1	V. POSITION : 12 o’clock (both CH)
SOURCE : VERT	H. POSITION : 12 o’clock
X-Y : ON

Adjust VR152 so that spot suits in the horizontal center of a scale.

Adj ust spot to suit the center of a CRT scale.

18

CS-4125A/CS-4135A

ADJUSTMENT

Item

Adjustment

Procedure

point

CH2 square wave

TC56

MODE : AUTO

AC-GND-DC : DC (both CH)

characteristic

TC101

VERT MODE : CH2

VOLTS/DIV : 10 mV (both CH)

[CS-4135A]

TC 502

SOURCE : VERT

V. VARIABLE : CAL (both CH)

* Use of a 50 Ω

X65-1500

1) Input a 1 MHz square wave signal to the CH2 INPUT. (5 div. input)

terminus machine.

29

*

* enlargement

5 div.

A

B

A

<

0.4

=

B

<

0.3

=

<

A + B = 0.6

CH1 square wave

TC6

MODE : AUTO

AC-GND-DC : DC (both CH)

characteristic

TC501

VERT MODE : CH1

VOLTS/DIV : 10 mV (both CH)

[CS-4135A]

X65-1500

SOURCE : VERT

V. VARIABLE : CAL (both CH)

* Use of a 50 Ω

1) Input a 1 MHz square wave signal to the CH1 INPUT. (5 div. input)

terminus machine.

30

*

* enlargement

5 div.

A

B

<

0.4

A

=

B

<

0.3

=

<

A + B = 0.6

CH2 square wave

TC56

MODE : AUTO

AC-GND-DC : DC (both CH)

characteristic

TC101

VERT MODE : CH2

VOLTS/DIV : 10 mV (both CH)

[CS-4125A]

X65-1490

SOURCE : VERT

V. VARIABLE : CAL (both CH)

* Use of a 50 Ω

1) Input a 1 MHz square wave signal to the CH2 INPUT. (5 div. input)

terminus machine.

31

*

* enlargement

5 div.

A

B

A

<

0.2

=

B

<

0.1

=

<

A + B = 0.3

CH1 square wave	TC6
characteristic	X65-1490
[CS-4125A]

*Use of a 50 Ω terminus machine.

32

MODE : AUTO	AC-GND-DC : DC (both CH)
VERT MODE : CH1	VOLTS/DIV : 10 mV (both CH)
SOURCE : VERT	V. VARIABLE : CAL (both CH)

1) Input a 1 MHz square wave signal to the CH1 INPUT. (5 div. input)

*	5 div.			A		* enlargement
				B				<	0.2
								A =
								<	0.1
								B =
									<
								A + B =		0.3

19