A site where discontinualed schematic diagrams and back dated information can be found on discontinued radios tv's and any electronic equipment can be found. Newer manuals either Service and operating manuals. Radio amateurs should find this site a great source for ham radio equipment manuals. I will return to this site should I need information on any electrical equipment. priced easy to download in a PDF format and print pages need to undertake the repair.
Quality scan of the original. All the detail necessary to troubleshoot, repair and adjust the unit. I'm sure I will be downloading more manuals in the future as the need arises.
Well.. I'd searched for this manual and although I found many copies online I was pleased to find your website with a well balanced pricing system and easy to search and follow links. That together with the very quick response time was just what I was looking for.. being a very impatient tech.. ;-) I had the service manual in front of me within a short time.
Bookmarked.. and you can bet I will always come here first for my service & user manuals..
best regards
Ed(Tony) Foley
G7WHK
Text excerpt from page 33 (click to view)
Measurements
IIS CLK11 NMUTE DAC
22 25 AMPLIFIER
1200 -17
1200 -19
CL96532086_062.eps 080999
Figure 8-33 Keep processor 7202 in reset by forcing pin 7 of connector 1208 to +5V. This puts the processor outputs in tristate. Check the reset at pin 4 of processor 7202 to make sure that the processor is in reset. Now, force port 0-4 pin 33 at 7202 to 0V to set the decoder outputs (SCLK, WCLK, DATA, and CL11). Check the MUTE pin 11 at 7309 : this pin should be low. Connect via an I2S generator I2S-signals to the DAC : Pin 1 at 7309: SLCK. Pin 2 at 7309: WCLK. Pin 3 at 7309: DATA. Connect also the SYSCLK pin 6 at position 7309 to a clock signal of 11.2896 MHz ±100ppm. Generate an I2S signal equivalent with a sine wave of 1kHz at 0dB for both left and right channels. Check if 0.8 VRMS at pins 14 and 16 at location 7209 with a DC of 1.65VDC. Check if 1.7 VRMS ±2 dB at connector pins 1and 3 at location 1209. Force MUTE Pin 11 at 7309 high. Measure again at pins 1 and 3 at location 1209 : both signals should be at -90 dB.
