28
14.23.2.Features
Low voltage requirement
Biphase transmission technique
Single pin oscillator
Test mode facility
14.23.3.Pinning
Pin
Mnemonic
Function
1
X7 (IPU)
sense input from key matrix
2
SSM (I)
sense mode selection input
3
Z0-Z3 (IPU)
sense inputs from key matrix
7
MDATA (OP3)
generated output data modulated with 1/12 the oscillator frequency at a 25% duty factor
8
DATA (OP3)
generated output inf ormation
9-13
DR7- DR3 (ODN)
Scan drivers
14
VSS
Ground (0V)
15-17
DR-2- DR0 (ODN)
Scan drivers
18
OSC (I)
Oscillator input
19
TP2 (I)
test point 2
20
TP1 (I)
Test point 1
21-27
X0-X6 (IPU)
Sense inputs from key matrix
28
VDD(I)
Voltage supply
Note:
(I): Input,
(IPU): input with p-channel pull-up transistor,
(ODN): output with open drain n-channel transistor
(OD3): output 3-state
15.AK52 CHASSIS MANUAL ADJUSTMENTS PROCEDURE
15.1.PRELIMINARY
Before starting with the alignment procedure, make sure that all the potentiometers on the chassis and
also screen and focus pots are in the medium position.
15.2.SYSTEM VOLTAGE ADJUSTMENTS
Inputs
AC power (220V 50Hz)
PAL B/G test pattern via RF
(PAL I test pattern for PAL I TV’s, SECAM D/K pattern, SECAM L/L’/K’ TVs.)
Outputs
Digital voltmeter to anode of D110.
Display
System voltage
Action
Apply power. Check that the stand-by Led lights.
Select TV mode and tune to the applied test pattern via local test keyboard.
Chassis should start normally.
Adjust all analog controls (volume, bass, treble, brightness, contrast, colour) to minimum
settings.
Adjust VR127 according to the following different type of CRTs.
SYSTEM VOLTAGE
TYPE OF CRT
135V±0.5V
PHILIPS A66EAK552X54
135V±0.5V
PHILIPS A66EAK071X54
135V±0.5V
VIDEOCOLOR A66ECY13X12
135V±0.5V
PHILIPS W66ESF002X44
15.3.AFC ADJUSTMENTS
Inputs
AC power
38.9 Mhz test pattern for PAL B/G, PAL-SECAM B/G or 39.5 MHz test pattern for PAL I
model (90dBmV) to Z403 SAW filter input terminals 1 and 2.
Outputs
Digital voltmeter to AFC point (pin22 of IC401)
Display
AFC Voltage.
Action
Adjust VL401 for 2.5±0.1 Volts. TV should automatically tune to a station when search
tuning is activated.
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